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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2018-12-29 00:07:06 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2018-12-29 00:07:06 +0000 |
| commit | e20bfbd18e64b8ab9428aa518b5d7b74a73461d9 (patch) | |
| tree | a5200fb4bd7b40981b58590f089defa85c251512 /libgo/runtime/go-unwind.c | |
| parent | 50bec22834e0b147fca92bea80501bccc309ce4d (diff) | |
| download | gcc-e20bfbd18e64b8ab9428aa518b5d7b74a73461d9.zip gcc-e20bfbd18e64b8ab9428aa518b5d7b74a73461d9.tar.gz gcc-e20bfbd18e64b8ab9428aa518b5d7b74a73461d9.tar.bz2 | |
runtime: prevent deadlock when profiling signal arrives in stack scan
Precise stack scan needs to unwind the stack. When it is
unwinding the stack, if a profiling signal arrives, which also
does a traceback, it may deadlock in dl_iterate_phdr. Prevent
this deadlock by setting up runtime_in_callers before traceback.
Reviewed-on: https://go-review.googlesource.com/c/155766
From-SVN: r267457
Diffstat (limited to 'libgo/runtime/go-unwind.c')
| -rw-r--r-- | libgo/runtime/go-unwind.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libgo/runtime/go-unwind.c b/libgo/runtime/go-unwind.c index 58cb270..158cbd0 100644 --- a/libgo/runtime/go-unwind.c +++ b/libgo/runtime/go-unwind.c @@ -792,7 +792,9 @@ bool scanstackwithmap (void *gcw) { _Unwind_Reason_Code code; + runtime_xadd (&__go_runtime_in_callers, 1); code = _Unwind_Backtrace (scanstackwithmap_callback, gcw); + runtime_xadd (&__go_runtime_in_callers, -1); return code == _URC_END_OF_STACK; } |