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runtime: non-strict InlTreeIndex lookup in expandFinalInlineFrame

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This is a follow-up to golang.org/cl/301369, which made the same change
in Frames.Next. The same logic applies here: a profile stack may have
been truncated at an invalid PC provided by cgoTraceback.
expandFinalInlineFrame will then try to lookup the inline tree and
crash.

The same fix applies as well: upon encountering a bad PC, simply leave
it as-is and move on.

Fixes #44971
Fixes #45480

Change-Id: I2823c67a1f3425466b05384cc6d30f5fc8ee6ddc
Reviewed-on: https://go-review.googlesource.com/c/go/+/309109
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Trust: Michael Pratt <mpratt@google.com>
This commit is contained in:
Michael Pratt 2021-04-09 17:01:45 -04:00
parent 5c9b6e8e63
commit aad13cbb74
1 changed files with 3 additions and 1 deletions
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4
src/runtime/symtab.go
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@ -185,7 +185,9 @@ func runtime_expandFinalInlineFrame(stk []uintptr) []uintptr {
var cache pcvalueCache
inltree := (*[1 << 20]inlinedCall)(inldata)
for {
ix := pcdatavalue(f, _PCDATA_InlTreeIndex, tracepc, &cache)
// Non-strict as cgoTraceback may have added bogus PCs
// with a valid funcInfo but invalid PCDATA.
ix := pcdatavalue1(f, _PCDATA_InlTreeIndex, tracepc, &cache, false)
if ix < 0 {
break
}