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runtime: call throw on systemstack in exitsyscall

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If exitsyscall tries to grow the stack it will panic, but throw calls
print, which can grow the stack. Move the two bare throws in
exitsyscall to the system stack.

Updates #21431.

Change-Id: I5b29da5d34ade908af648a12075ed327a864476c
Reviewed-on: https://go-review.googlesource.com/79517
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Austin Clements 2017-11-22 15:26:35 -05:00
parent c6c0f47e92
commit 09739d2850
1 changed files with 6 additions and 2 deletions
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8
src/runtime/proc.go
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@ -2939,7 +2939,9 @@ func exitsyscall(dummy int32) {
oldp := _g_.m.p.ptr()
if exitsyscallfast() {
if _g_.m.mcache == nil {
throw("lost mcache")
systemstack(func() {
throw("lost mcache")
})
}
if trace.enabled {
if oldp != _g_.m.p.ptr() || _g_.m.syscalltick != _g_.m.p.ptr().syscalltick {
@ -2986,7 +2988,9 @@ func exitsyscall(dummy int32) {
mcall(exitsyscall0)
if _g_.m.mcache == nil {
throw("lost mcache")
systemstack(func() {
throw("lost mcache")
})
}
// Scheduler returned, so we're allowed to run now.