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runtime: fix crash when returning from syscall during gc

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gp->m can go from non-nil to nil when it re-enters schedule().

R=golang-dev
CC=golang-dev, rsc
https://golang.org/cl/5245042
This commit is contained in:
Hector Chu 2011-10-11 12:57:16 -04:00 committed by Russ Cox
parent 4b749567b8
commit 8584445289
1 changed files with 3 additions and 2 deletions
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5
src/pkg/runtime/mgc0.c
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@ -597,6 +597,7 @@ handoff(Workbuf *b)
static void
scanstack(void (*scanblock)(byte*, int64), G *gp)
{
M *mp;
int32 n;
Stktop *stk;
byte *sp, *guard;
@ -607,8 +608,8 @@ scanstack(void (*scanblock)(byte*, int64), G *gp)
if(gp == g) {
// Scanning our own stack: start at &gp.
sp = (byte*)&gp;
} else if(gp->m != nil && gp->m->helpgc) {
// Gc helper scans its own stack.
} else if((mp = gp->m) != nil && mp->helpgc) {
// gchelper's stack is in active use and has no interesting pointers.
return;
} else {
// Scanning another goroutine's stack.