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runtime: zero a few more dead pointers.

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In channels, zeroing of gp.waiting is missed on a closed channel panic.
m.morebuf.g is not zeroed.

I don't expect the latter causes any problems, but just in case.

LGTM=iant
R=golang-codereviews, iant
CC=golang-codereviews
https://golang.org/cl/151610043
This commit is contained in:
Keith Randall 2014-10-08 17:22:34 -07:00
parent 060b24006a
commit b02450da02
2 changed files with 8 additions and 4 deletions
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11
src/runtime/chan.go
View File

@ -174,6 +174,10 @@ func chansend(t *chantype, c *hchan, ep unsafe.Pointer, block bool, callerpc uin
goparkunlock(&c.lock, "chan send")
// someone woke us up.
if mysg != gp.waiting {
gothrow("G waiting list is corrupted!")
}
gp.waiting = nil
if gp.param == nil {
if c.closed == 0 {
gothrow("chansend: spurious wakeup")
@ -184,10 +188,6 @@ func chansend(t *chantype, c *hchan, ep unsafe.Pointer, block bool, callerpc uin
if mysg.releasetime > 0 {
blockevent(int64(mysg.releasetime)-t0, 2)
}
if mysg != gp.waiting {
gothrow("G waiting list is corrupted!")
}
gp.waiting = nil
releaseSudog(mysg)
return true
}
@ -410,6 +410,9 @@ func chanrecv(t *chantype, c *hchan, ep unsafe.Pointer, block bool) (selected, r
goparkunlock(&c.lock, "chan receive")
// someone woke us up
if mysg != gp.waiting {
gothrow("G waiting list is corrupted!")
}
gp.waiting = nil
if mysg.releasetime > 0 {
blockevent(mysg.releasetime-t0, 2)

1
src/runtime/stack.c
View File

@ -725,6 +725,7 @@ runtime·newstack(void)
g->m->morebuf.pc = (uintptr)nil;
g->m->morebuf.lr = (uintptr)nil;
g->m->morebuf.sp = (uintptr)nil;
g->m->morebuf.g = (G*)nil;
runtime·casgstatus(gp, Grunning, Gwaiting);
gp->waitreason = runtime·gostringnocopy((byte*)"stack growth");