{"Entry":{"collection":"sqlstate","key":"XX000","name":"XX000","aliases":[],"metadata":{"aliases":[],"case_count":1,"class_code":"XX","condition_name":"internal_error","condition_names":["internal_error"],"content_hash":"8a5b000644f301d21a2898cef5d43438283c057d3de653e007c2b74a3498e4db","depth":"reference","editorial_review":"reviewed","evidence_tier":"source_path_confirmed","imported_at":"2026-09-30T17:45:28.162075+08:00","introduced":null,"known_present_by":"7.4","macros":["ERRCODE_INTERNAL_ERROR"],"name_zh":"内部错误","present_in":["9.0","9.1","9.2","9.3","9.4","9.5","9.6","10","11","12","13","14","15","16","17","18","19"],"preview_in":["19"],"primary_macro":"ERRCODE_INTERNAL_ERROR","removed":null,"runtime_verification":"not_applicable","severity_classes":["E"],"snippet_count":0,"source_rev":"english-manuals:e1cf957b27ee00962ed761abc4cfb75b52de58b2b6ed8b2542eafb44748db95c","sqlstate":"XX000","status":"active","summary_zh":"内部错误，也是未显式指定代码的 ERROR 默认码。"}},"Definition":{"Collection":"sqlstate","Key":"XX000","SourceDatabase":"center","Version":"18","SourceTable":"sqlstate","SourceKey":"XX000","SourceRevision":"english-manuals:e1cf957b27ee00962ed761abc4cfb75b52de58b2b6ed8b2542eafb44748db95c","Facts":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"XX000"},"ManualEvidence":{"doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"}},"MeasuredEvidence":{}},"Text":{"Collection":"sqlstate","Key":"XX000","SourceDatabase":"center","Version":"","Locale":"en","Title":"XX000 — internal_error","Summary":"XX000 is the internal_error condition in Class XX, Internal Error. The PostgreSQL source directory describes this class as covering “can't-happen” conditions and software bugs. It is a generic diagnostic boundary, not a claim that a database is corrupt.","BodyHTML":"\u003ch2\u003eAt a glance {#at-a-glance}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003eXX000\u003c/code\u003e is the \u003ccode\u003einternal_error\u003c/code\u003e condition in Class XX, \u003ccode\u003eInternal Error\u003c/code\u003e. The PostgreSQL source directory describes this class as covering “can\u0026#39;t-happen” conditions and software bugs. It is a generic diagnostic boundary, not a claim that a database is corrupt.\u003c/p\u003e\n\u003cp\u003eThe code also has a mechanical default. In the error stack initializer, an \u003ccode\u003eERROR\u003c/code\u003e or higher level with no later explicit code starts as \u003ccode\u003eERRCODE_INTERNAL_ERROR\u003c/code\u003e; \u003ccode\u003eWARNING\u003c/code\u003e starts as \u003ccode\u003eERRCODE_WARNING\u003c/code\u003e (\u003ccode\u003e01000\u003c/code\u003e); and a level below \u003ccode\u003eWARNING\u003c/code\u003e starts with \u003ccode\u003e00000\u003c/code\u003e unless it supplies its own code. An explicit \u003ccode\u003eerrcode()\u003c/code\u003e can select another SQLSTATE. Therefore, \u003ccode\u003eXX000\u003c/code\u003e can arise from a default \u003ccode\u003eelog(ERROR, ...)\u003c/code\u003e path or from a deliberate internal-error report.\u003c/p\u003e\n\u003cp\u003eSeverity and connection consequences are path-dependent. \u003ccode\u003eERROR\u003c/code\u003e, \u003ccode\u003eFATAL\u003c/code\u003e, and \u003ccode\u003ePANIC\u003c/code\u003e are different protocol severities; an explicit \u003ccode\u003eXX000\u003c/code\u003e can even accompany a \u003ccode\u003eNOTICE\u003c/code\u003e in extension test code. Read the severity, transaction status, connection state, source location, and complete diagnostic together.\u003c/p\u003e\n\u003cp\u003eThe representative case \u003ccode\u003einternal_error_safety_boundary\u003c/code\u003e is source-only. It is recorded as \u003ccode\u003enot_applicable\u003c/code\u003e on PostgreSQL 18.6 and 10.21 because forcing internal corruption or a fault would cross the safe disposable SQL boundary. No fabricated \u003ccode\u003eRAISE\u003c/code\u003e is presented as a natural internal server failure.\u003c/p\u003e\n\u003ch2\u003eMeaning and trigger paths {#meaning}\u003c/h2\u003e\n\u003cp\u003eThe 18.6 definition is \u003ccode\u003eXX000 E ERRCODE_INTERNAL_ERROR internal_error\u003c/code\u003e under Class XX. The class comment is intentionally broad. More specific codes exist for data corruption (\u003ccode\u003eXX001\u003c/code\u003e) and index corruption (\u003ccode\u003eXX002\u003c/code\u003e); choosing \u003ccode\u003eXX000\u003c/code\u003e does not silently upgrade a generic internal report into either diagnosis.\u003c/p\u003e\n\u003cp\u003eThere are two source patterns to distinguish:\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eDefault internal code.\u003c/strong\u003e A backend path calls \u003ccode\u003eelog(ERROR, ...)\u003c/code\u003e or otherwise reaches \u003ccode\u003eereport(ERROR, ...)\u003c/code\u003e without an explicit SQLSTATE. \u003ccode\u003eelog.c\u003c/code\u003e initializes that error as \u003ccode\u003eXX000\u003c/code\u003e. The message and source function still identify the subsystem.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eExplicit internal code.\u003c/strong\u003e A path calls \u003ccode\u003eerrcode(ERRCODE_INTERNAL_ERROR)\u003c/code\u003e because an invariant or an operating-system/service result was considered impossible or unusable. In 18.6, examples include btree rechecking that cannot re-find a tuple, an invalid dynamic shared-memory control segment, an attempt to redefine a non-placeholder configuration parameter, and failure to obtain strong random bytes for UUID generation.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003eThe explicit code does not force one severity. The shared-memory path reports \u003ccode\u003eFATAL\u003c/code\u003e, while the btree, GUC, and UUID examples report \u003ccode\u003eERROR\u003c/code\u003e. A test access-control hook intentionally reports \u003ccode\u003eNOTICE\u003c/code\u003e with \u003ccode\u003eERRCODE_INTERNAL_ERROR\u003c/code\u003e, showing that SQLSTATE and severity are separate fields. That hook is a source example, not evidence that ordinary production notices indicate an internal failure.\u003c/p\u003e\n\u003ch2\u003eMessages and diagnostics {#messages}\u003c/h2\u003e\n\u003cp\u003e\u003ccode\u003eXX000\u003c/code\u003e has no universal primary message. Representative source templates include:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003efailed to re-find tuple within index \u0026#34;%s\u0026#34;\u003c/code\u003e, with a hint that a non-immutable index expression may be responsible (\u003ccode\u003enbtinsert.c\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edynamic shared memory control segment is not valid\u003c/code\u003e on the \u003ccode\u003eFATAL\u003c/code\u003e initialization path (\u003ccode\u003edsm.c\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eattempt to redefine parameter \u0026#34;%s\u0026#34;\u003c/code\u003e (\u003ccode\u003eguc.c\u003c/code\u003e) and \u003ccode\u003ecould not generate random values\u003c/code\u003e (\u003ccode\u003euuid.c\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003einvalid page pd_lower %u pd_upper %u pd_special %u\u003c/code\u003e from a default \u003ccode\u003eelog(ERROR, ...)\u003c/code\u003e path (\u003ccode\u003ebufmask.c\u003c/code\u003e); the default mapping supplies \u003ccode\u003eXX000\u003c/code\u003e when no explicit code replaces it.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eTreat these as path-specific diagnostic templates. Record SQLSTATE, both severity fields, primary message, detail, hint, context, source file, function, line, backend PID, database, and server version. Localized text and template wording can vary; the source path and structured fields are more stable than a message substring.\u003c/p\u003e\n\u003ch2\u003eDiagnosis {#diagnosis}\u003c/h2\u003e\n\u003cp\u003ePreserve the complete client error and the matching server log record before retrying or restarting anything. First classify the protocol severity:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eAn \u003ccode\u003eERROR\u003c/code\u003e normally aborts the current explicit transaction but leaves the backend connection available after rollback.\u003c/li\u003e\n\u003cli\u003eA \u003ccode\u003eFATAL\u003c/code\u003e ends the backend session; the client must establish a new connection before continuing.\u003c/li\u003e\n\u003cli\u003eA \u003ccode\u003ePANIC\u003c/code\u003e is a server-wide emergency path whose process and connection effects must be confirmed from the server log and supervision state.\u003c/li\u003e\n\u003cli\u003eA \u003ccode\u003eWARNING\u003c/code\u003e or \u003ccode\u003eNOTICE\u003c/code\u003e with an explicit \u003ccode\u003eXX000\u003c/code\u003e has different control flow and does not by itself prove an internal failure or abort a transaction.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eThen group the event by source function and subsystem. Check for a preceding I/O, memory, extension, index, configuration, or concurrency failure; compare the exact server build and fixed source revision; and look for repeated occurrences. Use read-only catalog, index, or page checks only when the diagnostic points to them. Do not infer corruption from the class name alone, and do not replace the message with a hand-written \u003ccode\u003eRAISE EXCEPTION\u003c/code\u003e test: that would exercise \u003ccode\u003eP0001\u003c/code\u003e by default rather than the server\u0026#39;s internal path.\u003c/p\u003e\n\u003ch2\u003eResponse {#response}\u003c/h2\u003e\n\u003cp\u003eFollow the severity and the subsystem. Roll back an \u003ccode\u003eERROR\u003c/code\u003e transaction before issuing unrelated commands; reconnect after \u003ccode\u003eFATAL\u003c/code\u003e; and follow the server\u0026#39;s restart and incident procedure after \u003ccode\u003ePANIC\u003c/code\u003e. Do not blindly retry an internal-error operation, especially when the source points to an invariant, storage, index, or shared-memory boundary.\u003c/p\u003e\n\u003cp\u003eCollect the server version, exact SQL, backend and server logs, source location, relation or object identity, and recent configuration or extension changes. If the evidence points to corruption, stop writes as appropriate for the incident, preserve a copy or snapshot, and use the documented PostgreSQL recovery and support process. If it points to a deterministic software or extension defect without corruption evidence, isolate the reproducer and compare supported versions. The correct response is determined by that evidence, not by \u003ccode\u003eXX000\u003c/code\u003e alone.\u003c/p\u003e\n\u003ch2\u003eVersions {#versions}\u003c/h2\u003e\n\u003cp\u003eThe catalogue records \u003ccode\u003eXX000\u003c/code\u003e in the locked 7.4–8.4.22 pre-9.0 formal sources, every formal snapshot from 9.0.23 through 18.6, and the 19 Beta 3 preview. The same-tag \u003ccode\u003eREL8_1_4\u003c/code\u003e \u003ccode\u003eerrcodes.sgml\u003c/code\u003e table already lists \u003ccode\u003eXX000\u003c/code\u003e as \u003ccode\u003einternal_error\u003c/code\u003e, confirming that condition-name observation by 8.1.4. The class title is \u003ccode\u003eInternal Error (PostgreSQL-specific error class)\u003c/code\u003e in the 9.0 header view and changes to \u003ccode\u003eInternal Error\u003c/code\u003e in the 9.1 text definition. Candidate source gaps remain for 7.0–7.3; these are observed catalogue boundaries, not exact implementation introduction dates.\u003c/p\u003e\n\u003cp\u003eThe fixed 18.6 source commit is \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e. The default severity-to-code mapping and the source paths above are 18.6 evidence. No deterministic safe SQL trigger was accepted for the representative runtime case, so the runtime status remains \u003ccode\u003enot_applicable\u003c/code\u003e on both targets.\u003c/p\u003e\n\u003ch2\u003eRelated {#related}\u003c/h2\u003e\n\u003cp\u003e\u003ca href=\"/wiki/sqlstate/XX001/\" rel=\"nofollow\"\u003e\u003ccode\u003eXX001\u003c/code\u003e — \u003ccode\u003edata_corrupted\u003c/code\u003e\u003c/a\u003e and \u003ca href=\"/wiki/sqlstate/XX002/\" rel=\"nofollow\"\u003e\u003ccode\u003eXX002\u003c/code\u003e — \u003ccode\u003eindex_corrupted\u003c/code\u003e\u003c/a\u003e are more specific corruption conditions. \u003ca href=\"/wiki/sqlstate/P0001/\" rel=\"nofollow\"\u003e\u003ccode\u003eP0001\u003c/code\u003e — \u003ccode\u003eraise_exception\u003c/code\u003e\u003c/a\u003e is the normal default for an explicit PL/pgSQL \u003ccode\u003eRAISE EXCEPTION\u003c/code\u003e without a code. \u003ca href=\"/wiki/sqlstate/57P01/\" rel=\"nofollow\"\u003e\u003ccode\u003e57P01\u003c/code\u003e — \u003ccode\u003eadmin_shutdown\u003c/code\u003e\u003c/a\u003e is a server-connection event with a different class and response. \u003ca href=\"/wiki/sqlstate/25P02/\" rel=\"nofollow\"\u003e\u003ccode\u003e25P02\u003c/code\u003e — \u003ccode\u003ein_failed_sql_transaction\u003c/code\u003e\u003c/a\u003e is a follow-on transaction state after an earlier error, not a synonym for \u003ccode\u003eXX000\u003c/code\u003e.\u003c/p\u003e\n\u003ch2\u003eSources {#sources}\u003c/h2\u003e\n\u003cp\u003eThe structured evidence is recorded in the \u003ca href=\"#sources\" rel=\"nofollow\"\u003epublic evidence JSON\u003c/a\u003e. Source records are pinned to PostgreSQL commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; runtime records retain the exact source-only case ID and both target summaries.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.errcodes.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L496-L502\" rel=\"nofollow\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.elog.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/error/elog.c#L442-L454\" rel=\"nofollow\"\u003e\u003ccode\u003eelog.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.nbtinsert.18.6\u003c/code\u003e, \u003ccode\u003esrc.dsm.18.6\u003c/code\u003e, \u003ccode\u003esrc.guc.18.6\u003c/code\u003e, \u003ccode\u003esrc.uuid.18.6\u003c/code\u003e, and \u003ccode\u003esrc.bufmask.18.6\u003c/code\u003e — source-confirmed internal paths\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.oat-hooks.18.6\u003c/code\u003e — explicit internal code at \u003ccode\u003eNOTICE\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.protocol.18\u003c/code\u003e — \u003ca href=\"/docs/18/protocol-error-fields.html\" rel=\"nofollow\"\u003eError and Notice Message Fields\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n","SourceRevision":"english-manuals:e1cf957b27ee00962ed761abc4cfb75b52de58b2b6ed8b2542eafb44748db95c","ContentHash":"1c811993c422e4e70f619340a45d952cb5be2b852b18967c90715662f890d8a7","Payload":{"body_md":"\n## At a glance {#at-a-glance}\n\n`XX000` is the `internal_error` condition in Class XX, `Internal Error`. The PostgreSQL source directory describes this class as covering “can't-happen” conditions and software bugs. It is a generic diagnostic boundary, not a claim that a database is corrupt.\n\nThe code also has a mechanical default. In the error stack initializer, an `ERROR` or higher level with no later explicit code starts as `ERRCODE_INTERNAL_ERROR`; `WARNING` starts as `ERRCODE_WARNING` (`01000`); and a level below `WARNING` starts with `00000` unless it supplies its own code. An explicit `errcode()` can select another SQLSTATE. Therefore, `XX000` can arise from a default `elog(ERROR, ...)` path or from a deliberate internal-error report.\n\nSeverity and connection consequences are path-dependent. `ERROR`, `FATAL`, and `PANIC` are different protocol severities; an explicit `XX000` can even accompany a `NOTICE` in extension test code. Read the severity, transaction status, connection state, source location, and complete diagnostic together.\n\nThe representative case `internal_error_safety_boundary` is source-only. It is recorded as `not_applicable` on PostgreSQL 18.6 and 10.21 because forcing internal corruption or a fault would cross the safe disposable SQL boundary. No fabricated `RAISE` is presented as a natural internal server failure.\n\n\n## Meaning and trigger paths {#meaning}\n\nThe 18.6 definition is `XX000 E ERRCODE_INTERNAL_ERROR internal_error` under Class XX. The class comment is intentionally broad. More specific codes exist for data corruption (`XX001`) and index corruption (`XX002`); choosing `XX000` does not silently upgrade a generic internal report into either diagnosis.\n\nThere are two source patterns to distinguish:\n\n1. **Default internal code.** A backend path calls `elog(ERROR, ...)` or otherwise reaches `ereport(ERROR, ...)` without an explicit SQLSTATE. `elog.c` initializes that error as `XX000`. The message and source function still identify the subsystem.\n2. **Explicit internal code.** A path calls `errcode(ERRCODE_INTERNAL_ERROR)` because an invariant or an operating-system/service result was considered impossible or unusable. In 18.6, examples include btree rechecking that cannot re-find a tuple, an invalid dynamic shared-memory control segment, an attempt to redefine a non-placeholder configuration parameter, and failure to obtain strong random bytes for UUID generation.\n\nThe explicit code does not force one severity. The shared-memory path reports `FATAL`, while the btree, GUC, and UUID examples report `ERROR`. A test access-control hook intentionally reports `NOTICE` with `ERRCODE_INTERNAL_ERROR`, showing that SQLSTATE and severity are separate fields. That hook is a source example, not evidence that ordinary production notices indicate an internal failure.\n\n## Messages and diagnostics {#messages}\n\n`XX000` has no universal primary message. Representative source templates include:\n\n- `failed to re-find tuple within index \"%s\"`, with a hint that a non-immutable index expression may be responsible (`nbtinsert.c`).\n- `dynamic shared memory control segment is not valid` on the `FATAL` initialization path (`dsm.c`).\n- `attempt to redefine parameter \"%s\"` (`guc.c`) and `could not generate random values` (`uuid.c`).\n- `invalid page pd_lower %u pd_upper %u pd_special %u` from a default `elog(ERROR, ...)` path (`bufmask.c`); the default mapping supplies `XX000` when no explicit code replaces it.\n\nTreat these as path-specific diagnostic templates. Record SQLSTATE, both severity fields, primary message, detail, hint, context, source file, function, line, backend PID, database, and server version. Localized text and template wording can vary; the source path and structured fields are more stable than a message substring.\n\n## Diagnosis {#diagnosis}\n\nPreserve the complete client error and the matching server log record before retrying or restarting anything. First classify the protocol severity:\n\n- An `ERROR` normally aborts the current explicit transaction but leaves the backend connection available after rollback.\n- A `FATAL` ends the backend session; the client must establish a new connection before continuing.\n- A `PANIC` is a server-wide emergency path whose process and connection effects must be confirmed from the server log and supervision state.\n- A `WARNING` or `NOTICE` with an explicit `XX000` has different control flow and does not by itself prove an internal failure or abort a transaction.\n\nThen group the event by source function and subsystem. Check for a preceding I/O, memory, extension, index, configuration, or concurrency failure; compare the exact server build and fixed source revision; and look for repeated occurrences. Use read-only catalog, index, or page checks only when the diagnostic points to them. Do not infer corruption from the class name alone, and do not replace the message with a hand-written `RAISE EXCEPTION` test: that would exercise `P0001` by default rather than the server's internal path.\n\n## Response {#response}\n\nFollow the severity and the subsystem. Roll back an `ERROR` transaction before issuing unrelated commands; reconnect after `FATAL`; and follow the server's restart and incident procedure after `PANIC`. Do not blindly retry an internal-error operation, especially when the source points to an invariant, storage, index, or shared-memory boundary.\n\nCollect the server version, exact SQL, backend and server logs, source location, relation or object identity, and recent configuration or extension changes. If the evidence points to corruption, stop writes as appropriate for the incident, preserve a copy or snapshot, and use the documented PostgreSQL recovery and support process. If it points to a deterministic software or extension defect without corruption evidence, isolate the reproducer and compare supported versions. The correct response is determined by that evidence, not by `XX000` alone.\n\n## Versions {#versions}\n\nThe catalogue records `XX000` in the locked 7.4–8.4.22 pre-9.0 formal sources, every formal snapshot from 9.0.23 through 18.6, and the 19 Beta 3 preview. The same-tag `REL8_1_4` `errcodes.sgml` table already lists `XX000` as `internal_error`, confirming that condition-name observation by 8.1.4. The class title is `Internal Error (PostgreSQL-specific error class)` in the 9.0 header view and changes to `Internal Error` in the 9.1 text definition. Candidate source gaps remain for 7.0–7.3; these are observed catalogue boundaries, not exact implementation introduction dates.\n\nThe fixed 18.6 source commit is `724edf9bde9d356724ad384a2e196edc3c9f80f7`. The default severity-to-code mapping and the source paths above are 18.6 evidence. No deterministic safe SQL trigger was accepted for the representative runtime case, so the runtime status remains `not_applicable` on both targets.\n\n## Related {#related}\n\n[`XX001` — `data_corrupted`](/wiki/sqlstate/XX001/) and [`XX002` — `index_corrupted`](/wiki/sqlstate/XX002/) are more specific corruption conditions. [`P0001` — `raise_exception`](/wiki/sqlstate/P0001/) is the normal default for an explicit PL/pgSQL `RAISE EXCEPTION` without a code. [`57P01` — `admin_shutdown`](/wiki/sqlstate/57P01/) is a server-connection event with a different class and response. [`25P02` — `in_failed_sql_transaction`](/wiki/sqlstate/25P02/) is a follow-on transaction state after an earlier error, not a synonym for `XX000`.\n\n## Sources {#sources}\n\nThe structured evidence is recorded in the [public evidence JSON](#sources). Source records are pinned to PostgreSQL commit `724edf9bde9d356724ad384a2e196edc3c9f80f7`; runtime records retain the exact source-only case ID and both target summaries.\n\n- `src.errcodes.18.6` — [`errcodes.txt`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L496-L502)\n- `src.elog.18.6` — [`elog.c`](https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/error/elog.c#L442-L454)\n- `src.nbtinsert.18.6`, `src.dsm.18.6`, `src.guc.18.6`, `src.uuid.18.6`, and `src.bufmask.18.6` — source-confirmed internal paths\n- `src.oat-hooks.18.6` — explicit internal code at `NOTICE`\n- `doc.protocol.18` — [Error and Notice Message Fields](/docs/18/protocol-error-fields.html)\n","description":"PostgreSQL uses SQLSTATE XX000 for internal-error paths and as the default code for an ERROR without an explicit code. Preserve the full diagnostic and investigate the exact subsystem; XX000 alone does not prove corruption.","is_stale":false,"name":"","sections":[{"anchor":"at-a-glance","heading":"At a glance","html":"\u003cp\u003e\u003ccode\u003eXX000\u003c/code\u003e is the \u003ccode\u003einternal_error\u003c/code\u003e condition in Class XX, \u003ccode\u003eInternal Error\u003c/code\u003e. The PostgreSQL source directory describes this class as covering “can't-happen” conditions and software bugs. It is a generic diagnostic boundary, not a claim that a database is corrupt.\u003c/p\u003e\n\u003cp\u003eThe code also has a mechanical default. In the error stack initializer, an \u003ccode\u003eERROR\u003c/code\u003e or higher level with no later explicit code starts as \u003ccode\u003eERRCODE_INTERNAL_ERROR\u003c/code\u003e; \u003ccode\u003eWARNING\u003c/code\u003e starts as \u003ccode\u003eERRCODE_WARNING\u003c/code\u003e (\u003ccode\u003e01000\u003c/code\u003e); and a level below \u003ccode\u003eWARNING\u003c/code\u003e starts with \u003ccode\u003e00000\u003c/code\u003e unless it supplies its own code. An explicit \u003ccode\u003eerrcode()\u003c/code\u003e can select another SQLSTATE. Therefore, \u003ccode\u003eXX000\u003c/code\u003e can arise from a default \u003ccode\u003eelog(ERROR, ...)\u003c/code\u003e path or from a deliberate internal-error report.\u003c/p\u003e\n\u003cp\u003eSeverity and connection consequences are path-dependent. \u003ccode\u003eERROR\u003c/code\u003e, \u003ccode\u003eFATAL\u003c/code\u003e, and \u003ccode\u003ePANIC\u003c/code\u003e are different protocol severities; an explicit \u003ccode\u003eXX000\u003c/code\u003e can even accompany a \u003ccode\u003eNOTICE\u003c/code\u003e in extension test code. Read the severity, transaction status, connection state, source location, and complete diagnostic together.\u003c/p\u003e\n\u003cp\u003eThe representative case \u003ccode\u003einternal_error_safety_boundary\u003c/code\u003e is source-only. It is recorded as \u003ccode\u003enot_applicable\u003c/code\u003e on PostgreSQL 18.6 and 10.21 because forcing internal corruption or a fault would cross the safe disposable SQL boundary. No fabricated \u003ccode\u003eRAISE\u003c/code\u003e is presented as a natural internal server failure.\u003c/p\u003e"},{"anchor":"meaning","heading":"Meaning and trigger paths","html":"\u003cp\u003eThe 18.6 definition is \u003ccode\u003eXX000 E ERRCODE_INTERNAL_ERROR internal_error\u003c/code\u003e under Class XX. The class comment is intentionally broad. More specific codes exist for data corruption (\u003ccode\u003eXX001\u003c/code\u003e) and index corruption (\u003ccode\u003eXX002\u003c/code\u003e); choosing \u003ccode\u003eXX000\u003c/code\u003e does not silently upgrade a generic internal report into either diagnosis.\u003c/p\u003e\n\u003cp\u003eThere are two source patterns to distinguish:\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eDefault internal code.\u003c/strong\u003e A backend path calls \u003ccode\u003eelog(ERROR, ...)\u003c/code\u003e or otherwise reaches \u003ccode\u003eereport(ERROR, ...)\u003c/code\u003e without an explicit SQLSTATE. \u003ccode\u003eelog.c\u003c/code\u003e initializes that error as \u003ccode\u003eXX000\u003c/code\u003e. The message and source function still identify the subsystem.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eExplicit internal code.\u003c/strong\u003e A path calls \u003ccode\u003eerrcode(ERRCODE_INTERNAL_ERROR)\u003c/code\u003e because an invariant or an operating-system/service result was considered impossible or unusable. In 18.6, examples include btree rechecking that cannot re-find a tuple, an invalid dynamic shared-memory control segment, an attempt to redefine a non-placeholder configuration parameter, and failure to obtain strong random bytes for UUID generation.\u003c/li\u003e\n\u003c/ol\u003e\n\u003cp\u003eThe explicit code does not force one severity. The shared-memory path reports \u003ccode\u003eFATAL\u003c/code\u003e, while the btree, GUC, and UUID examples report \u003ccode\u003eERROR\u003c/code\u003e. A test access-control hook intentionally reports \u003ccode\u003eNOTICE\u003c/code\u003e with \u003ccode\u003eERRCODE_INTERNAL_ERROR\u003c/code\u003e, showing that SQLSTATE and severity are separate fields. That hook is a source example, not evidence that ordinary production notices indicate an internal failure.\u003c/p\u003e"},{"anchor":"messages","heading":"Messages and diagnostics","html":"\u003cp\u003e\u003ccode\u003eXX000\u003c/code\u003e has no universal primary message. Representative source templates include:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003efailed to re-find tuple within index \"%s\"\u003c/code\u003e, with a hint that a non-immutable index expression may be responsible (\u003ccode\u003enbtinsert.c\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edynamic shared memory control segment is not valid\u003c/code\u003e on the \u003ccode\u003eFATAL\u003c/code\u003e initialization path (\u003ccode\u003edsm.c\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eattempt to redefine parameter \"%s\"\u003c/code\u003e (\u003ccode\u003eguc.c\u003c/code\u003e) and \u003ccode\u003ecould not generate random values\u003c/code\u003e (\u003ccode\u003euuid.c\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003einvalid page pd_lower %u pd_upper %u pd_special %u\u003c/code\u003e from a default \u003ccode\u003eelog(ERROR, ...)\u003c/code\u003e path (\u003ccode\u003ebufmask.c\u003c/code\u003e); the default mapping supplies \u003ccode\u003eXX000\u003c/code\u003e when no explicit code replaces it.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eTreat these as path-specific diagnostic templates. Record SQLSTATE, both severity fields, primary message, detail, hint, context, source file, function, line, backend PID, database, and server version. Localized text and template wording can vary; the source path and structured fields are more stable than a message substring.\u003c/p\u003e"},{"anchor":"diagnosis","heading":"Diagnosis","html":"\u003cp\u003ePreserve the complete client error and the matching server log record before retrying or restarting anything. First classify the protocol severity:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eAn \u003ccode\u003eERROR\u003c/code\u003e normally aborts the current explicit transaction but leaves the backend connection available after rollback.\u003c/li\u003e\n\u003cli\u003eA \u003ccode\u003eFATAL\u003c/code\u003e ends the backend session; the client must establish a new connection before continuing.\u003c/li\u003e\n\u003cli\u003eA \u003ccode\u003ePANIC\u003c/code\u003e is a server-wide emergency path whose process and connection effects must be confirmed from the server log and supervision state.\u003c/li\u003e\n\u003cli\u003eA \u003ccode\u003eWARNING\u003c/code\u003e or \u003ccode\u003eNOTICE\u003c/code\u003e with an explicit \u003ccode\u003eXX000\u003c/code\u003e has different control flow and does not by itself prove an internal failure or abort a transaction.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eThen group the event by source function and subsystem. Check for a preceding I/O, memory, extension, index, configuration, or concurrency failure; compare the exact server build and fixed source revision; and look for repeated occurrences. Use read-only catalog, index, or page checks only when the diagnostic points to them. Do not infer corruption from the class name alone, and do not replace the message with a hand-written \u003ccode\u003eRAISE EXCEPTION\u003c/code\u003e test: that would exercise \u003ccode\u003eP0001\u003c/code\u003e by default rather than the server's internal path.\u003c/p\u003e"},{"anchor":"response","heading":"Response","html":"\u003cp\u003eFollow the severity and the subsystem. Roll back an \u003ccode\u003eERROR\u003c/code\u003e transaction before issuing unrelated commands; reconnect after \u003ccode\u003eFATAL\u003c/code\u003e; and follow the server's restart and incident procedure after \u003ccode\u003ePANIC\u003c/code\u003e. Do not blindly retry an internal-error operation, especially when the source points to an invariant, storage, index, or shared-memory boundary.\u003c/p\u003e\n\u003cp\u003eCollect the server version, exact SQL, backend and server logs, source location, relation or object identity, and recent configuration or extension changes. If the evidence points to corruption, stop writes as appropriate for the incident, preserve a copy or snapshot, and use the documented PostgreSQL recovery and support process. If it points to a deterministic software or extension defect without corruption evidence, isolate the reproducer and compare supported versions. The correct response is determined by that evidence, not by \u003ccode\u003eXX000\u003c/code\u003e alone.\u003c/p\u003e"},{"anchor":"versions","heading":"Versions","html":"\u003cp\u003eThe catalogue records \u003ccode\u003eXX000\u003c/code\u003e in the locked 7.4–8.4.22 pre-9.0 formal sources, every formal snapshot from 9.0.23 through 18.6, and the 19 Beta 3 preview. The same-tag \u003ccode\u003eREL8_1_4\u003c/code\u003e \u003ccode\u003eerrcodes.sgml\u003c/code\u003e table already lists \u003ccode\u003eXX000\u003c/code\u003e as \u003ccode\u003einternal_error\u003c/code\u003e, confirming that condition-name observation by 8.1.4. The class title is \u003ccode\u003eInternal Error (PostgreSQL-specific error class)\u003c/code\u003e in the 9.0 header view and changes to \u003ccode\u003eInternal Error\u003c/code\u003e in the 9.1 text definition. Candidate source gaps remain for 7.0–7.3; these are observed catalogue boundaries, not exact implementation introduction dates.\u003c/p\u003e\n\u003cp\u003eThe fixed 18.6 source commit is \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e. The default severity-to-code mapping and the source paths above are 18.6 evidence. No deterministic safe SQL trigger was accepted for the representative runtime case, so the runtime status remains \u003ccode\u003enot_applicable\u003c/code\u003e on both targets.\u003c/p\u003e"},{"anchor":"related","heading":"Related","html":"\u003cp\u003e\u003ca href=\"/wiki/sqlstate/XX001/\"\u003e\u003ccode\u003eXX001\u003c/code\u003e — \u003ccode\u003edata_corrupted\u003c/code\u003e\u003c/a\u003e and \u003ca href=\"/wiki/sqlstate/XX002/\"\u003e\u003ccode\u003eXX002\u003c/code\u003e — \u003ccode\u003eindex_corrupted\u003c/code\u003e\u003c/a\u003e are more specific corruption conditions. \u003ca href=\"/wiki/sqlstate/P0001/\"\u003e\u003ccode\u003eP0001\u003c/code\u003e — \u003ccode\u003eraise_exception\u003c/code\u003e\u003c/a\u003e is the normal default for an explicit PL/pgSQL \u003ccode\u003eRAISE EXCEPTION\u003c/code\u003e without a code. \u003ca href=\"/wiki/sqlstate/57P01/\"\u003e\u003ccode\u003e57P01\u003c/code\u003e — \u003ccode\u003eadmin_shutdown\u003c/code\u003e\u003c/a\u003e is a server-connection event with a different class and response. \u003ca href=\"/wiki/sqlstate/25P02/\"\u003e\u003ccode\u003e25P02\u003c/code\u003e — \u003ccode\u003ein_failed_sql_transaction\u003c/code\u003e\u003c/a\u003e is a follow-on transaction state after an earlier error, not a synonym for \u003ccode\u003eXX000\u003c/code\u003e.\u003c/p\u003e"},{"anchor":"sources","heading":"Sources","html":"\u003cp\u003eThe structured evidence is recorded in the \u003ca href=\"#sources\"\u003epublic evidence JSON\u003c/a\u003e. Source records are pinned to PostgreSQL commit \u003ccode\u003e724edf9bde9d356724ad384a2e196edc3c9f80f7\u003c/code\u003e; runtime records retain the exact source-only case ID and both target summaries.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ccode\u003esrc.errcodes.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/errcodes.txt#L496-L502\"\u003e\u003ccode\u003eerrcodes.txt\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.elog.18.6\u003c/code\u003e — \u003ca href=\"https://github.com/postgres/postgres/blob/724edf9bde9d356724ad384a2e196edc3c9f80f7/src/backend/utils/error/elog.c#L442-L454\"\u003e\u003ccode\u003eelog.c\u003c/code\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.nbtinsert.18.6\u003c/code\u003e, \u003ccode\u003esrc.dsm.18.6\u003c/code\u003e, \u003ccode\u003esrc.guc.18.6\u003c/code\u003e, \u003ccode\u003esrc.uuid.18.6\u003c/code\u003e, and \u003ccode\u003esrc.bufmask.18.6\u003c/code\u003e — source-confirmed internal paths\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003esrc.oat-hooks.18.6\u003c/code\u003e — explicit internal code at \u003ccode\u003eNOTICE\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003edoc.protocol.18\u003c/code\u003e — \u003ca href=\"/docs/18/protocol-error-fields.html\"\u003eError and Notice Message Fields\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e"}],"summary":"XX000 is the internal_error condition in Class XX, Internal Error. The PostgreSQL source directory describes this class as covering “can't-happen” conditions and software bugs. It is a generic diagnostic boundary, not a claim that a database is corrupt.","title":"XX000 — internal_error","translation_source_rev":"b4f5852e740841101b77ae19b72b03a6cc57330308b8e2b264d6155114a733fb"}},"RequestedLocale":"en","Fallback":false,"Versions":["10","11","12","13","14","15","16","17","18","19","20","8.1","8.2","8.3","8.4","9.0","9.1","9.2","9.3","9.4","9.5","9.6"],"Locales":["en","zh-Hans"],"Signatures":null,"Spellings":null,"SQLState":{"aliases":[],"catalogue_notes":{"earliest_observed":"7.4","formal_scope":"9.0.0..18.6","latest_observed":"18.6","matrix_scope":["9.0.23","9.1.24","9.2.24","9.3.25","9.4.26","9.5.25","9.6.24","10.23","11.22","12.22","13.23","14.24","15.19","16.15","17.11","18.6"],"pre9_scope":{"formal_tag_count":191,"maximum_release":"8.4.22","minimum_release":"7.0.0","source_definition_count":153,"source_doc_count":153,"source_file_count":306,"source_scope":"7.4..8.4 definition files; 7.0..7.3 candidate-path source gap probes","source_tag_count":153},"pre9_status":"present","preview_scope":["19beta3"]},"class":"XX","class_name":"Internal Error","condition_name":"internal_error","condition_names":["internal_error"],"definition_changes":[{"evidence_refs":["postgresql:REL9_0_23:src/include/utils/errcodes.h","postgresql:REL9_1_0:src/backend/utils/errcodes.txt"],"first_observed":"9.1.0","from":["Internal Error (PostgreSQL-specific error class)"],"kind":"class_title","notes":"Observed definition change between fixed release snapshots; exact commit introduction may precede the first release tag.","to":["Internal Error"]}],"english_manuals":{"10":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"9607b57e9f639b61785677ba4d226f5889fe1d19c8bf55a3337691899a9073cd","slug":"10"},"lang":"en","sqlstate":"XX000"},"11":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"3a024e38263ad77de228eed7930b842b42dc1d5cab9ca3727be8eed872ec9539","slug":"11"},"lang":"en","sqlstate":"XX000"},"12":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1444bd6a138537cd75be88a220ee9472ac528f0cfc58758e49636d85455efe98","slug":"12"},"lang":"en","sqlstate":"XX000"},"13":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"4a3ef8af218e5736dfde8660ba609e84233b6b3bac7e0210ff8724cf1b27b2db","slug":"13"},"lang":"en","sqlstate":"XX000"},"14":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"1c12e83304e0f4ff64c9d98ca5e3007df6756932ed19867a4fa0e0650f6c5751","slug":"14"},"lang":"en","sqlstate":"XX000"},"15":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"2161f58f6e87f6535b3b1f3d4661427bb6765f4f6b074fcc16fac97594b50599","slug":"15"},"lang":"en","sqlstate":"XX000"},"16":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"928e705933d7c3d018ae3fba9d800b34e6325746d157339dce878473c519d100","slug":"16"},"lang":"en","sqlstate":"XX000"},"17":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"868135520af87351e3ea1ba42656111cbd2d157d98e1fef05ea158ac5729d8b1","slug":"17"},"lang":"en","sqlstate":"XX000"},"18":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"56dacf78e618ff0fd8c533e05db597b80d7ebbad7f8e512a888217d0640aa328","slug":"18"},"lang":"en","sqlstate":"XX000"},"19":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"63fb8d1aa9f494eeab9d0f8542a2b673f7746ee41ae2689d19403cb3cc425a5c","slug":"19"},"lang":"en","sqlstate":"XX000"},"20":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"0d3f602127cd137cf343b32d5fa78f175eeb6cdcb6353b1f6f998ede6cb7b911","slug":"devel"},"lang":"en","sqlstate":"XX000"},"8.1":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"0177b8818643540dec7bbef1fe92b60a3961debd52a68412301647ca146c7f2d","slug":"8.1"},"lang":"en","sqlstate":"XX000"},"8.2":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"d65bf7cff5958c304352c974e477183e21efe9bd68e03786001874653bf66963","slug":"8.2"},"lang":"en","sqlstate":"XX000"},"8.3":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"118059002973cdec5466ed3cabe7c9370b4c93d8ab542b8661d0eeb50cf6950d","slug":"8.3"},"lang":"en","sqlstate":"XX000"},"8.4":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"d63b10001be0581484022e33b78124a36bb3bd68d3ebe022cd7dfb375233432f","slug":"8.4"},"lang":"en","sqlstate":"XX000"},"9.0":{"aliases":[],"class_name":"Internal Error","condition_name":"internal_error","doc":{"anchor":"ERRCODES-APPENDIX","file":"errcodes-appendix.html","lang":"en","sha256":"658fc09c4c10eed7ac7dea4ed3e3eff8cc5791eb5af26b7b4a31b0f863b316db","slug":"9.0"},"lang":"en","sqlstate":"XX000"},"9.1":{"aliases":[],"class_name":"Internal 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in a PostgreSQL release definition file is established; runtime throw/use scanning is maintained 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old definition path and same-tag documentation were locked for the observed 7.4..8.4 tags; this is a definition presence bound, not a runtime path or precise introducing commit.","scope":"pre9-definition-history","status":"definition_only"}]},"Evidence":[{"Kind":"cases","Ordinal":0,"ID":"internal_error_safety_boundary","ServerVersion":null,"Status":null,"Payload":{"assertions":["The directory and source paths are recorded","The batch marks the natural runtime trigger not applicable rather than fabricating one"],"case_id":"internal_error_safety_boundary","cleanup":"No runtime resources are created.","has_snippet":false,"position":0,"preconditions":["A source-confirmed internal error path"],"repair":"Preserve diagnostics, stop treating the session as healthy when appropriate, and investigate the exact server path with supportable evidence.","trigger":"No deterministic safe SQL trigger is used; forcing internal corruption would violate the disposable-case safety 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UUID generation failure."}},{"Kind":"claims","Ordinal":3,"ID":"paths.default-elog","ServerVersion":null,"Status":null,"Payload":{"claim_id":"paths.default-elog","limits":"The source example is a diagnostic invariant check; a real occurrence requires the exact runtime path and environment.","method":"Read the bufmask elog call and the error-stack default mapping.","position":3,"runtime":[],"sources":["src.bufmask.18.6","src.elog.18.6"],"statement":"A default elog(ERROR, ...) path such as the invalid-page check starts with XX000 through the generic severity mapping when it supplies no explicit SQLSTATE."}},{"Kind":"claims","Ordinal":4,"ID":"paths.severity-separation","ServerVersion":null,"Status":null,"Payload":{"claim_id":"paths.severity-separation","limits":"The OAT hook is test-module code and does not represent normal production internal-error behavior.","method":"Read each ereport level alongside its explicit errcode and compare the protocol severity 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The same-tag REL8_1_4 errcodes.sgml row already lists XX000 as internal_error, confirming that condition-name observation by 8.1.4. The class title changes between the 9.0 header and 9.1 text definitions; candidate source gaps remain for 7.0–7.3. These are presence boundaries, not exact implementation introduction dates."}},{"Kind":"messages","Ordinal":0,"ID":"message.index-refind","ServerVersion":null,"Status":null,"Payload":{"limits":"The message belongs to the UNIQUE_CHECK_EXISTING btree path and carries a relation/constraint context.","message_id":"message.index-refind","path":"","position":0,"raw":{"hint_template":"This may be because of a non-immutable index expression.","id":"message.index-refind","limits":"The message belongs to the UNIQUE_CHECK_EXISTING btree path and carries a relation/constraint context.","primary_template":"failed to re-find tuple within index \"%s\"","severity_source":"explicit ERROR","sources":["src.nbtinsert.18.6"],"sqlstate":"XX000"},"severity":"explicit ERROR","sources":["src.nbtinsert.18.6"],"templates":[{"kind":"primary","literal":"failed to re-find tuple within index \" \"","position":0,"role":"","template":"failed to re-find tuple within index \"%s\""},{"kind":"hint","literal":"This may be because of a non-immutable index expression.","position":1,"role":"","template":"This may be because of a non-immutable index expression."}]}},{"Kind":"messages","Ordinal":1,"ID":"message.dsm-fatal","ServerVersion":null,"Status":null,"Payload":{"limits":"This path terminates the backend session; it is not a generic client-side error template.","message_id":"message.dsm-fatal","path":"","position":1,"raw":{"id":"message.dsm-fatal","limits":"This path terminates the backend session; it is not a generic client-side error template.","primary_template":"dynamic shared memory control segment is not valid","severity_source":"explicit FATAL","sources":["src.dsm.18.6"],"sqlstate":"XX000"},"severity":"explicit FATAL","sources":["src.dsm.18.6"],"templates":[{"kind":"primary","literal":"dynamic shared memory control segment is not valid","position":0,"role":"","template":"dynamic shared memory control segment is not 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