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runtime: use saved state in SIGPROF handler for vDSO calls

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VDSO calls do manual stack alignment, which doesn't get tracked in the
pcsp table. Without accurate pcsp information, backtracing them is
dangerous, and causes a crash in the SIGPROF handler. Fortunately,
https://golang.org/cl/97315 saves a clean state in m.vdsoPC/SP. Change
to use those if they're present, without attempting a normal backtrace.

Fixes #24925

Change-Id: I4b8501ae73a9d18209e22f839773c4fe6102a509
Reviewed-on: https://go-review.googlesource.com/107778
Run-TryBot: Heschi Kreinick <heschi@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Heschi Kreinick 2018-04-18 13:03:35 -04:00
parent 24d5c871aa
commit acebfba755
1 changed files with 1 additions and 1 deletions
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2
src/runtime/proc.go
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@ -3716,7 +3716,7 @@ func sigprof(pc, sp, lr uintptr, gp *g, mp *m) {
// transition. We simply require that g and SP match and that the PC is not // transition. We simply require that g and SP match and that the PC is not
// in gogo. // in gogo.
traceback := true traceback := true
if gp == nil || sp < gp.stack.lo || gp.stack.hi < sp || setsSP(pc) { if gp == nil || sp < gp.stack.lo || gp.stack.hi < sp || setsSP(pc) || (mp != nil && mp.vdsoSP != 0) {
traceback = false traceback = false
} }
var stk [maxCPUProfStack]uintptr var stk [maxCPUProfStack]uintptr