Sentry: catch.go:24: runtime error: invalid memory address or nil pointer dereference (1) plan gist: AgHO////vxwAANABAAAAAwUEBgQ= Wraps: (2) while executing: SHOW CREATE FUNCTION _._ Wraps: (3) Wraps:...

This issue was auto filed by Sentry. It represents a crash or reported error on a live cluster with telemetry enabled.

Sentry Link: [https://cockroach-labs.sentry.io/issues/7727765677/?referrer=webhooks_plugin](https://cockroach-labs.sentry.io/issues/7727765677/?referrer=webhooks_plugin)

Panic Message:

```
catch.go:24: runtime error: invalid memory address or nil pointer dereference
(1) plan gist: AgHO////vxwAANABAAAAAwUEBgQ=
Wraps: (2) while executing: SHOW CREATE FUNCTION _._
Wraps: (3)
Wraps: (4) assertion failure
Wraps: (5) attached stack trace
-- stack trace:
| github.com/cockroachdb/cockroach/pkg/util/errorutil.shouldCatch
| pkg/util/errorutil/catch.go:24
| github.com/cockroachdb/cockroach/pkg/util/errorutil.MaybeCatchPanic
| pkg/util/errorutil/catch.go:38
| runtime.gopanic
| GOROOT/src/runtime/panic.go:783
| runtime.panicmem
| GOROOT/src/runtime/panic.go:262
| runtime.sigpanic
| GOROOT/src/runtime/signal_unix.go:925
| github.com/cockroachdb/cockroach/pkg/sql.formatFunctionQueryTypesForDisplay.func2
| pkg/sql/show_create_clauses.go:474
| github.com/cockroachdb/cockroach/pkg/sql/sem/plpgsqltree.(*TypeRefVisitor).Visit
| pkg/sql/sem/plpgsqltree/visitor.go:336
| github.com/cockroachdb/cockroach/pkg/sql/sem/plpgsqltree.(*Declaration).WalkStmt
| pkg/sql/sem/plpgsqltree/statements.go:180
| github.com/cockroachdb/cockroach/pkg/sql/sem/plpgsqltree.(*Block).WalkStmt
| pkg/sql/sem/plpgsqltree/statements.go:107
| github.com/cockroachdb/cockroach/pkg/sql/sem/plpgsqltree.Walk
| pkg/sql/sem/plpgsqltree/visitor.go:23
| github.com/cockroachdb/cockroach/pkg/sql.formatFunctionQueryTypesForDisplay
| pkg/sql/show_create_clauses.go:523
| github.com/cockroachdb/cockroach/pkg/sql.init.createRoutinePopulate.func955
| pkg/sql/crdb_internal.go:3383
| github.com/cockroachdb/cockroach/pkg/sql.(*virtualDefEntry).getPlanInfo.func1.1
| pkg/sql/virtual_schema.go:697
| github.com/cockroachdb/cockroach/pkg/sql.setupGenerator.func3.1
| pkg/sql/virtual_table.go:130
| github.com/cockroachdb/cockroach/pkg/sql.setupGenerator.func3
| pkg/sql/virtual_table.go:131
| github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTaskEx.func1
| pkg/util/stop/stopper.go:447
| runtime.goexit
| src/runtime/asm_amd64.s:1693
Wraps: (6) runtime error: invalid memory address or nil pointer dereference
| -- cause hidden behind barrier
| runtime error: invalid memory address or nil pointer dereference
| (1) runtime error: invalid memory address or nil pointer dereference
| Error types: (1) runtime.errorString
Error types: (1) *safedetails.withSafeDetails (2) *safedetails.withSafeDetails (3) *colexecerror.notInternalError (4) *assert.withAssertionFailure (5) *withstack.withStack (6) *barriers.barrierErr
-- report composition:
*barriers.barrierErr: masked error: runtime error: invalid memory address or nil pointer dereference
catch.go:24: *withstack.withStack (top exception)
*assert.withAssertionFailure
*colexecerror.notInternalError
*safedetails.withSafeDetails: while executing: SHOW CREATE FUNCTION _._
*safedetails.withSafeDetails: plan gist: AgHO////vxwAANABAAAAAwUEBgQ=
```

Stacktrace (expand for inline code snippets):

[src/runtime/asm_amd64.s#L1692-L1694](src/runtime/asm_amd64.s#L1692-L1694)
[pkg/util/stop/stopper.go#L446-L448](pkg/util/stop/stopper.go#L446-L448)
[pkg/sql/virtual_table.go#L130-L132](pkg/sql/virtual_table.go#L130-L132)
[pkg/sql/virtual_table.go#L129-L131](pkg/sql/virtual_table.go#L129-L131)
[pkg/sql/virtual_schema.go#L696-L698](pkg/sql/virtual_schema.go#L696-L698)
[pkg/sql/crdb_internal.go#L3382-L3384](pkg/sql/crdb_internal.go#L3382-L3384)
[pkg/sql/show_create_clauses.go#L522-L524](pkg/sql/show_create_clauses.go#L522-L524)
[pkg/sql/sem/plpgsqltree/visitor.go#L22-L24](pkg/sql/sem/plpgsqltree/visitor.go#L22-L24)
[pkg/sql/sem/plpgsqltree/statements.go#L106-L108](pkg/sql/sem/plpgsqltree/statements.go#L106-L108)
[pkg/sql/sem/plpgsqltree/statements.go#L179-L181](pkg/sql/sem/plpgsqltree/statements.go#L179-L181)
[pkg/sql/sem/plpgsqltree/visitor.go#L335-L337](pkg/sql/sem/plpgsqltree/visitor.go#L335-L337)
[pkg/sql/show_create_clauses.go#L473-L475](pkg/sql/show_create_clauses.go#L473-L475)
[GOROOT/src/runtime/signal_unix.go#L924-L926](GOROOT/src/runtime/signal_unix.go#L924-L926)
[GOROOT/src/runtime/panic.go#L261-L263](GOROOT/src/runtime/panic.go#L261-L263)
[GOROOT/src/runtime/panic.go#L782-L784](GOROOT/src/runtime/panic.go#L782-L784)
[pkg/util/errorutil/catch.go#L37-L39](pkg/util/errorutil/catch.go#L37-L39)
[pkg/util/errorutil/catch.go#L23-L25](pkg/util/errorutil/catch.go#L23-L25)

```
src/runtime/asm_amd64.s in runtime.goexit at line 1693
pkg/util/stop/stopper.go in pkg/util/stop.(*Stopper).RunAsyncTaskEx.func1 at line 447
pkg/sql/virtual_table.go in pkg/sql.setupGenerator.func3 at line 131
pkg/sql/virtual_table.go in pkg/sql.setupGenerator.func3.1 at line 130
pkg/sql/virtual_schema.go in pkg/sql.(*virtualDefEntry).getPlanInfo.func1.1 at line 697
pkg/sql/crdb_internal.go in pkg/sql.init.createRoutinePopulate.func955 at line 3383
pkg/sql/show_create_clauses.go in pkg/sql.formatFunctionQueryTypesForDisplay at line 523
pkg/sql/sem/plpgsqltree/visitor.go in pkg/sql/sem/plpgsqltree.Walk at line 23
pkg/sql/sem/plpgsqltree/statements.go in pkg/sql/sem/plpgsqltree.(*Block).WalkStmt at line 107
pkg/sql/sem/plpgsqltree/statements.go in pkg/sql/sem/plpgsqltree.(*Declaration).WalkStmt at line 180
pkg/sql/sem/plpgsqltree/visitor.go in pkg/sql/sem/plpgsqltree.(*TypeRefVisitor).Visit at line 336
pkg/sql/show_create_clauses.go in pkg/sql.formatFunctionQueryTypesForDisplay.func2 at line 474
GOROOT/src/runtime/signal_unix.go in runtime.sigpanic at line 925
GOROOT/src/runtime/panic.go in runtime.panicmem at line 262
GOROOT/src/runtime/panic.go in runtime.gopanic at line 783
pkg/util/errorutil/catch.go in pkg/util/errorutil.MaybeCatchPanic at line 38
pkg/util/errorutil/catch.go in pkg/util/errorutil.shouldCatch at line 24
```

### Tags

| Tag | Value |
| --- | --- |
| Command | mt start-sql |
| Environment | v26.2.6 |
| Go Version | go1.25.13 |
| Platform | linux amd64 |
| Distribution | CCL |
| Cockroach Release | v26.2.6 |
| Cockroach SHA | f0adfbe4c645d4d458de930b415fd46c4459ad90 |
| # of CPUs | 16 |
| # of Goroutines | 270 |

Jira issue: CRDB-68212

Start in pkg/sql/show_create_clauses.go at lines 474 and 523, then read pkg/sql/sem/plpgsqltree/visitor.go around line 336 and the related declaration walking code. Investigate the nil dereference while executing SHOW CREATE FUNCTION, using the mt start-sql environment described in the report. Done means this operation no longer crashes with the reported invalid memory address error.

Written by the indexing model from the issue text.