On 6/11/2019 4:52 AM, Corinna Vinschen wrote: > On Jun 7 12:10, Ken Brown wrote: >> While testing some new pipe code, I'm occasionally seeing a timerfd deadlock: >> The main thread is stuck in timerfd_tracker::dtor at timerfd.cc:354, waiting >> for >> the timerfd thread to close; and the timerfd thread is stuck at >> timerfd.cc:140, >> waiting to acquire a mutex that's held by timerfd_tracker::dtor. > > Hmm, I had hoped my current code does not have a deadlock situation > anymore, but I was wrong, apparently. > > Is there any chance to create an STC?
I haven't been able to create an STC. The deadlock seems to depend on a rare timing fluke, and I've only seen it when running a parallel make on a clean emacs tree, with my new pipe code installed. On the other hand, I think I have a simple fix, which I'll send to cygwin-patches. With this patch, I ran the parallel make 15 times without getting the deadlock. After reverting the patch, I got the deadlock on the 4th run. Ken
