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8009302: Mac OS X: JVM crash on infinite recursion on Appkit Thread

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Use SA_ONSTACK flag to ensure signal gets delivered properly.

Reviewed-by: dholmes, coleenp
This commit is contained in:
Gerard Ziemski 2013-06-05 14:12:49 -04:00 • committed by Harold Seigel
parent f3fb3c4777
commit 2fad2249a2
1 changed files with 13 additions and 0 deletions
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13
hotspot/src/os/bsd/vm/os_bsd.cpp
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@ -3030,6 +3030,19 @@ void os::Bsd::set_signal_handler(int sig, bool set_installed) {
sigAct.sa_sigaction = signalHandler;
sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
}
#if __APPLE__
// Needed for main thread as XNU (Mac OS X kernel) will only deliver SIGSEGV
// (which starts as SIGBUS) on main thread with faulting address inside "stack+guard pages"
// if the signal handler declares it will handle it on alternate stack.
// Notice we only declare we will handle it on alt stack, but we are not
// actually going to use real alt stack - this is just a workaround.
// Please see ux_exception.c, method catch_mach_exception_raise for details
// link http://www.opensource.apple.com/source/xnu/xnu-2050.18.24/bsd/uxkern/ux_exception.c
if (sig == SIGSEGV) {
sigAct.sa_flags |= SA_ONSTACK;
}
#endif
// Save flags, which are set by ours
assert(sig > 0 && sig < MAXSIGNUM, "vm signal out of expected range");
sigflags[sig] = sigAct.sa_flags;