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runtime: traceback through active lessstack

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With this change, a panic trace due to a signal arriving while
running on the scheduler stack during a lessstack
(a stack unsplit) will trace through the lessstack to show
the state of the goroutine that was unsplitting its stack.

R=r
CC=golang-dev
https://golang.org/cl/4206042
This commit is contained in:
Russ Cox 2011-02-23 14:47:22 -05:00
parent 63c24081a0
commit 4b376ef328
2 changed files with 23 additions and 0 deletions
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12
src/pkg/runtime/amd64/traceback.c
View File

@ -164,6 +164,18 @@ gentraceback(byte *pc0, byte *sp, G *g, int32 skip, uintptr *pcbuf, int32 max)
continue;
}
if(pcbuf == nil && f->entry == (uintptr)runtime·lessstack && g == m->g0) {
// Lessstack is running on scheduler stack. Switch to original goroutine.
runtime·printf("----- lessstack called from goroutine %d -----\n", m->curg->goid);
g = m->curg;
stk = (Stktop*)g->stackbase;
sp = stk->gobuf.sp;
pc = (uintptr)stk->gobuf.pc;
fp = nil;
lr = 0;
continue;
}
// Unwind to next frame.
pc = lr;
lr = 0;

11
src/pkg/runtime/arm/traceback.c
View File

@ -149,6 +149,17 @@ gentraceback(byte *pc0, byte *sp, byte *lr0, G *g, int32 skip, uintptr *pcbuf, i
continue;
}
if(pcbuf == nil && f->entry == (uintptr)runtime·lessstack && g == m->g0) {
runtime·printf("----- lessstack called from goroutine %d -----\n", m->curg->goid);
g = m->curg;
stk = (Stktop*)g->stackbase;
sp = stk->gobuf.sp;
pc = (uintptr)stk->gobuf.pc;
fp = nil;
lr = 0;
continue;
}
// Unwind to next frame.
pc = lr;
lr = 0;