On Fri, Feb 23, 2018 at 02:03:15PM +0100, Max Reitz wrote: > Hi, > > iotest 203 relatively often fails for me, at least when run in parallel. > When I run the following concurrently on four shells: > > $ while TEST_DIR=/tmp/t1 ./check -T -qcow2 203; do; done > $ while TEST_DIR=/tmp/t2 ./check -T -qcow2 203; do; done > $ while TEST_DIR=/tmp/t3 ./check -T -qcow2 203; do; done > $ while TEST_DIR=/tmp/t4 ./check -T -qcow2 203; do; done > > Very quickly (like under ten iterations), at least one of those starts > to hang and then fails because of a timeout in vm.get_qmp_event(). > > Before digging deeper into the ppoll() dungeon* myself, I decided to > report this so I wouldn't have to. :-)
Thanks for reporting it. I will send a patch and CC you. Stefan > *Backtrace: > > (gdb) bt > #0 0x00007f354137b4d6 in ppoll () at /lib64/libc.so.6 > #1 0x000055b659144299 in ppoll (__ss=0x0, __timeout=0x7ffe4eaca230, > __nfds=<optimized out>, __fds=<optimized out>) at > /usr/include/bits/poll2.h:77 > #2 0x000055b659144299 in qemu_poll_ns (fds=<optimized out>, > nfds=<optimized out>, timeout=timeout@entry=39512999619000) at > util/qemu-timer.c:334 > #3 0x000055b6591450a3 in os_host_main_loop_wait (timeout=<optimized > out>) at util/main-loop.c:255 > #4 0x000055b6591450a3 in main_loop_wait (nonblocking=<optimized out>) > at util/main-loop.c:515 > #5 0x000055b658d4a253 in main_loop () at vl.c:1933 > #6 0x000055b658d4a253 in main (argc=<optimized out>, argv=<optimized > out>, envp=<optimized out>) at vl.c:4757 > > Max >
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