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runtime: call throw on systemstack in exitsyscall 

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.