On Mar 19, 2021, at 5:27 PM, Stefan Metzmacher <metze@xxxxxxxxx> wrote: > > Hi Jens, > > as said before I found some problems related to > the new io_threads together with signals. > > I applied the diff (at the end) to examples/io_uring-cp.c > in order to run endless in order to give me time to > look at /proc/... > > Trying to attach gdb --pid to the pid of the main process (thread group) > it goes into an endless loop because it can't attach to the io_threads. > > Sending kill -STOP to the main pid causes the io_threads to spin cpu > at 100%. > > Can you try to reproduce and fix it? Maybe same_thread_group() should not match? Definitely, I’ll go over this shortly and make sure we handle (and ignore) signals correctly. — Jens Axboe
