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runtime: if "panic during panic"'s stacktrace fails, don't recurse.

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R=golang-codereviews, iant, khr, dvyukov
CC=golang-codereviews
https://golang.org/cl/54160043
This commit is contained in:
Keith Randall 2014-01-21 14:34:37 -08:00
parent 2a2a3baac4
commit c8c18614af
1 changed files with 25 additions and 10 deletions
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35
src/pkg/runtime/panic.c
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@ -355,19 +355,34 @@ runtime·startpanic(void)
m->mallocing = 1; // tell rest of panic not to try to malloc
} else if(m->mcache == nil) // can happen if called from signal handler or throw
m->mcache = runtime·allocmcache();
if(m->dying) {
switch(m->dying) {
case 0:
m->dying = 1;
if(g != nil)
g->writebuf = nil;
runtime·xadd(&runtime·panicking, 1);
runtime·lock(&paniclk);
if(runtime·debug.schedtrace > 0 || runtime·debug.scheddetail > 0)
runtime·schedtrace(true);
runtime·freezetheworld();
return;
case 1:
// Something failed while panicing, probably the print of the
// argument to panic(). Just print a stack trace and exit.
m->dying = 2;
runtime·printf("panic during panic\n");
runtime·dopanic(0);
runtime·exit(3); // not reached
runtime·exit(3);
case 2:
// This is a genuine bug in the runtime, we couldn't even
// print the stack trace successfully.
m->dying = 3;
runtime·printf("stack trace unavailable\n");
runtime·exit(4);
default:
// Can't even print! Just exit.
runtime·exit(5);
}
m->dying = 1;
if(g != nil)
g->writebuf = nil;
runtime·xadd(&runtime·panicking, 1);
runtime·lock(&paniclk);
if(runtime·debug.schedtrace > 0 || runtime·debug.scheddetail > 0)
runtime·schedtrace(true);
runtime·freezetheworld();
}
void