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runtime: symbolize morestack caller in throwsplit panic

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This attempts to symbolize the PC of morestack's caller when there's a
stack split at a bad time. The stack trace starts at the *caller* of
the function that attempted to grow the stack, so this is useful if it
isn't obvious what's being called at that point, such as in #21431.

Change-Id: I5dee305d87c8069611de2d14e7a3083d76264f8f
Reviewed-on: https://go-review.googlesource.com/84115
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Austin Clements 2017-12-14 15:32:12 -05:00
parent bfb8f2a765
commit 44213336f0
1 changed files with 8 additions and 1 deletions
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9
src/runtime/stack.go
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@ -938,7 +938,14 @@ func newstack() {
morebuf := thisg.m.morebuf
gp.syscallsp = morebuf.sp
gp.syscallpc = morebuf.pc
print("runtime: newstack sp=", hex(gp.sched.sp), " stack=[", hex(gp.stack.lo), ", ", hex(gp.stack.hi), "]\n",
pcname, pcoff := "(unknown)", uintptr(0)
f := findfunc(gp.sched.pc)
if f.valid() {
pcname = funcname(f)
pcoff = gp.sched.pc - f.entry
}
print("runtime: newstack at ", pcname, "+", hex(pcoff),
" sp=", hex(gp.sched.sp), " stack=[", hex(gp.stack.lo), ", ", hex(gp.stack.hi), "]\n",
"\tmorebuf={pc:", hex(morebuf.pc), " sp:", hex(morebuf.sp), " lr:", hex(morebuf.lr), "}\n",
"\tsched={pc:", hex(gp.sched.pc), " sp:", hex(gp.sched.sp), " lr:", hex(gp.sched.lr), " ctxt:", gp.sched.ctxt, "}\n")