On 05/17/2013 10:05 PM, Eric Blake wrote: > I found root cause on two nasty races today, but ran out of time to > write the patches until next week. > > > 2. We have a (rare) deadlock due to the use of a non-async-signal-safe > getpwuid_r in between fork and exec. I was also surprised to learn today that getgid() is required to be async-signal-safe, but the more powerful getregid() is not. And guess which one we use :( But I think it is a bug in POSIX, so I filed this: http://austingroupbugs.net/view.php?id=699 Also, some good news - we have previously remarked on this list that strlen() and friends are surprisingly not required to be async-signal-safe, but we went ahead and used them anyways. Thankfully, sanity has prevailed, and the next version of POSIX will require them to be async-signal-safe: http://austingroupbugs.net/view.php?id=692 -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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