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 0x7f354137b4d6 in ppoll () at /lib64/libc.so.6
> #1 0x55b659144299 in ppoll (__ss=0x0, __timeout=0x7ffe4eaca230,
> __nfds=, __fds=) at
> /usr/include/bits/poll2.h:77
> #2 0x55b659144299 in qemu_poll_ns (fds=,
> nfds=, timeout=timeout@entry=39512999619000) at
> util/qemu-timer.c:334
> #3 0x55b6591450a3 in os_host_main_loop_wait (timeout= out>) at util/main-loop.c:255
> #4 0x55b6591450a3 in main_loop_wait (nonblocking=)
> at util/main-loop.c:515
> #5 0x55b658d4a253 in main_loop () at vl.c:1933
> #6 0x55b658d4a253 in main (argc=, argv= out>, envp=) at vl.c:4757
>
> Max
>
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