x/tools/gopls: SEGV due to nil or invalid g in sa4011.run

[adonovan]

#!stacks
"sigpanic" && "sa4011.run:+0,+0x0"

Issue created by stacks.

Obviously memory (or register) corruption.

This stack tgzFdw was reported by telemetry:

• crash/crash
• runtime.throw:+9,+0x33
• runtime.sigpanic:+33,+0x213
• honnef.co/go/tools/staticcheck/sa4011.run:+0,+0x0
• golang.org/x/tools/gopls/internal/cache.(*action).exec.func6:+31,+0x7f
• golang.org/x/tools/gopls/internal/cache.(*action).exec:+199,+0x7b3
• golang.org/x/tools/gopls/internal/cache.execActions.func1.1:+2,+0x47
• sync.(*Once).doSlow:+5,+0xdf
• sync.(*Once).Do:=69,+0x73
• golang.org/x/tools/gopls/internal/cache.execActions.func1:+2,+0x44
• runtime.goexit:+0,+0x3

golang.org/x/tools/gopls@v0.20.0 go1.25.1 darwin/arm64 gopls.client=vscode (1)

Use this command to reproduce the executable:
(HOME=$(mktemp -d); GOOS=darwin GOARCH=arm64 GOTOOLCHAIN=go1.25.1 go install golang.org/x/tools/gopls@v0.20.0 && find $HOME/go/bin -type f)
To disassemble: go tool objdump exe | less

[gabyhelp]

Related Issues

• x/tools/gopls: SEGV accessing g in function prolog (R28 is nil or invalid) #76158
• x/tools/gopls: SEGV in string comparison in mapaccess #76159
• x/tools/gopls: impossible panic in BlockStmt.End (type checking IfStmt with nil Body) #76327
• x/tools/gopls: impossible crash in strings.HasPrefix #76627
• x/tools/gopls: impossible crash in (*types.Checker).basicLit #76329
• x/tools/gopls: impossible panic reading rtype.hash in type assertion #76328
• x/tools/gopls: corrupt g in printf.run #75232
• x/tools/gopls: Definition: nil deref due to undefined Label #76625
• x/tools/gopls: growslice crashes while zeroing #74932
• x/tools/gopls: DidChangeWatchedFiles: impossible crash in growslice #75465

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