x/tools/gopls: SEGV in ParseDiagnostics (corrupt g or SP)

[adonovan]

#!stacks
"sigpanic" && "mod.ParseDiagnostics:+0"

Issue created by stacks.

This function can't fail; must be memory corruption.

This stack Cu3k2Q was reported by telemetry:

• crash/crash
• runtime.throw:+9,+0x37
• runtime.sigpanic:+33,+0x223
• golang.org/x/tools/gopls/internal/mod.ParseDiagnostics:+0,+0x0
• golang.org/x/tools/gopls/internal/server.(*server).diagnose:+48,+0x1f3
• golang.org/x/tools/gopls/internal/server.(*server).diagnoseSnapshot:+31,+0x1cb
• golang.org/x/tools/gopls/internal/server.(*server).diagnoseChangedViews.func1:+3,+0xbb
• golang.org/x/tools/gopls/internal/server.(*server).diagnoseChangedViews.gowrap1:+16,+0x3b
• runtime.goexit:+0,+0x3

golang.org/x/tools/gopls@v0.20.0 go1.24.4 darwin/arm64 other,vscode (1)

[gabyhelp]

Related Issues

• x/tools/gopls: SEGV in HasSuffix (corrupt string) #74348
• x/tools/gopls: SEGV updating non-nil map in analysis.Validate #73437
• x/tools/gopls: corrupt g in printf.run #75232
• x/tools/gopls: FoldingRange: corrupt g in slices.SortFunc #75237
• x/tools/gopls: CodeAction: nil panic in findMatchingDiagnostics #71028 (closed)
• x/tools/gopls: SEGV in prolog of metadata.Graph.Update (bad g or sp) #74256
• x/tools/gopls: spurious SEGV in Promise #73967
• x/tools/gopls: sigpanic in methods of persistent.Map (corrupt g) #74870
• x/tools/gopls: SEGV while clearing memory in newobject #71561
• x/tools/gopls: template.SemanticTokens: panic in template.(*Parsed).RuneCount #74776 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}