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runtime: never show system goroutines in traceback

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Fixes #9791

g.issystem flag setup races with other code wherever we set it.
Even if we set both in parent goroutine and in the system goroutine,
it is still possible that some other goroutine crashes
before the flag is set. We could pass issystem flag to newproc1,
but we start all goroutines with go nowadays.

Instead look at g.startpc to distinguish system goroutines (similar to topofstack).

Change-Id: Ia3467968dee27fa07d9fecedd4c2b00928f26645
Reviewed-on: https://go-review.googlesource.com/4113
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Dmitry Vyukov 2015-02-07 15:31:18 +03:00
parent 84e2567537
commit 59495e8dfd
9 changed files with 61 additions and 14 deletions
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1
src/runtime/runtime2.go
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@ -199,7 +199,6 @@ type g struct {
waitsince int64 // approx time when the g become blocked
waitreason string // if status==gwaiting
schedlink *g
issystem bool // do not output in stack dump, ignore in deadlock detector
preempt bool // preemption signal, duplicates stackguard0 = stackpreempt
paniconfault bool // panic (instead of crash) on unexpected fault address
preemptscan bool // preempted g does scan for gc