@prattmic @mknyszek

It's unfortunate that this only captures the stack from systemstack_switch.

My guess is that this is most likely "runtime: cannot allocate memory" from https://cs.opensource.google/go/go/+/master:src/runtime/malloc.go;l=1609;drc=54fe0fd43fcf8609666c16ae6d15ed92873b1564

If it just runs out of memory, I'm not sure if there is anything particular we can do...

@randall77 mentioned that if it is the profiler fail to allocate memory, we can ignore it and just not profile, but it will probably fail soon in some other allocations...

It would be nice if we can get any information about the memory, but that would be hard for telemetry...

This stack Fj-s0A was reported by telemetry:

• crash/crash
• runtime.systemstack_switch:+4
• runtime.(*mheap).alloc:+5
• runtime.(*mcache).allocLarge:+15
• runtime.mallocgcLarge:+16
• runtime.mallocgc:+53
• runtime.growslice:+95
• golang.org/x/tools/go/ast/inspector.(*visitor).push:+5
• golang.org/x/tools/go/ast/inspector.walk:+1
• golang.org/x/tools/go/ast/inspector.walk:+47
• golang.org/x/tools/go/ast/inspector.walkList[...]:=21
• golang.org/x/tools/go/ast/inspector.walk:+49
• golang.org/x/tools/go/ast/inspector.walkList[...]:=21
• golang.org/x/tools/go/ast/inspector.walk:+260
• golang.org/x/tools/go/ast/inspector.walkList[...]:=21
• golang.org/x/tools/go/ast/inspector.walk:+285
• golang.org/x/tools/go/ast/inspector.walkList[...]:=21
• golang.org/x/tools/go/ast/inspector.walk:+305
• golang.org/x/tools/go/ast/inspector.traverse:+18
• golang.org/x/tools/go/ast/inspector.New:=70
• golang.org/x/tools/go/analysis/passes/inspect.run:+1
• golang.org/x/tools/gopls/internal/cache.(*action).exec.func7:+31

golang.org/x/tools/gopls@v0.18.1 go1.24.0 windows/amd64 other (1)

This stack hNWWXA was reported by telemetry:

• crash/crash
• runtime.systemstack_switch:+4
• runtime.(*mheap).alloc:+5
• runtime.(*mcache).allocLarge:+15
• runtime.mallocgcLarge:+16
• runtime.mallocgc:+53
• runtime.growslice:+87
• golang.org/x/tools/gopls/internal/cache/xrefs.Index.func2:+57
• go/ast.inspector.Visit:+1
• go/ast.Walk:+1
• go/ast.walkList[...]:=21
• go/ast.Walk:+287
• go/ast.walkList[...]:=21
• go/ast.Walk:+308
• go/ast.Inspect:=372
• golang.org/x/tools/gopls/internal/cache/xrefs.Index:+21
• golang.org/x/tools/gopls/internal/cache.(*syntaxPackage).xrefs.func1:+1
• sync.(*Once).doSlow:+5
• sync.(*Once).Do:=69
• golang.org/x/tools/gopls/internal/cache.(*syntaxPackage).xrefs:+1
• golang.org/x/tools/gopls/internal/cache.storePackageResults:+2

golang.org/x/tools/gopls@v0.18.1 go1.24.0 windows/amd64 other (1)

Folding into #71814.

Folding into #70445.