On Sat, Jan 12, 2019 at 12:15 AM Dr. David Alan Gilbert <dgilb...@redhat.com> wrote:
> * Peter Maydell (peter.mayd...@linaro.org) wrote: > > Recently I've noticed that test-filter-mirror has been hanging > > intermittently, typically when run on some other TCG architecture. > > In the instance I've just looked at, this was with s390x guest on > > x86-64 host, though I've also seen it on other host archs and > > perhaps with other guests. > > Watch out to see if you really do see it for other guests; > it carefully avoids using virtio-net to avoid vhost; but on s390x it > uses virtio-net-ccw - could that hit the vhost it was trying to avoid? > > > Below is a backtrace, though it seems to be pretty unhelpful. > > Anybody got any theories ? Does the mirror test rely on dirty > > memory bitmaps like the migration test (which also hangs > > occasionally with TCG due to some bug I'm sure we've investigated > > in the past) ? > > I don't think it relies on the CPU at all. > > Dave > > I have no idea about this currently, but Jason and I designed the test case. Add Jason: Have any comments about this ? Thanks Zhang Chen > > Processes: > > petmay01 10533 0.0 0.0 15624 1400 pts/16 S+ 14:22 0:00 > > \_ tests/test-filter-mirror --quiet > > --keep-going -m=quick --GTestLogFD=6 > > petmay01 10534 0.0 0.2 979892 36492 pts/16 Sl+ 14:22 0:00 > > \_ s390x-softmmu/qemu-system-s390x > > -qtest unix:/tmp/qtest-10533.sock,nowait -qtest-log /dev/null -chardev > > socket,path=/tmp/qtest-10533.qmp,nowait,id=char0 -mon > > chardev=char0,mode=control -machine accel=qtest -display none -netdev > > socket,id=qtest-bn0,fd=4 -device > > virtio-net-ccw,netdev=qtest-bn0,id=qtest-e0 -chardev > > socket,id=mirror0,path=filter-mirror.Ongzms,server,nowait -object > > filter-mirror,id=qtest-f0,netdev=qtest-bn0,queue=tx,outdev=mirror0 > > > > Backtrace of all threads in the QEMU process: > > Thread 4 (Thread 0x7f59b67ff700 (LWP 10539)): > > #0 0x00007f59cf908156 in __sigwait (sig=0x7f59b67fc510, set=<optimised > out>) > > at ../sysdeps/unix/sysv/linux/sigwait.c:64 > > #1 0x00007f59cf908156 in __sigwait (set=<optimised out>, > sig=0x7f59b67fc510) > > at ../sysdeps/unix/sysv/linux/sigwait.c:96 > > #2 0x00005639a87c4c8e in qemu_dummy_cpu_thread_fn (arg=0x5639aa544250) > > at /home/petmay01/linaro/qemu-for-merges/cpus.c:1326 > > #3 0x00005639a8b8b911 in qemu_thread_start (args=0x5639aa569010) > > at /home/petmay01/linaro/qemu-for-merges/util/qemu-thread-posix.c:502 > > #4 0x00007f59cf8fe6ba in start_thread (arg=0x7f59b67ff700) at > > pthread_create.c:333 > > #5 0x00007f59cf63441d in clone () at > > ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 > > > > Thread 3 (Thread 0x7f59bf1f0700 (LWP 10538)): > > #0 0x00007f59cf62874d in poll () at > ../sysdeps/unix/syscall-template.S:84 > > #1 0x00007f59e64e638c in g_main_context_iterate (priority=2147483647, > > n_fds=3, fds=0x7f59b0001300, timeout=<optimised out>, > > context=0x7f59b00008c0) > > at /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gmain.c:4135 > > #2 0x00007f59e64e638c in g_main_context_iterate > > (context=0x7f59b00008c0, block=block@entry=1, > > dispatch=dispatch@entry=1, self=<optimised out>) > > at /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gmain.c:3835 > > #3 0x00007f59e64e6712 in g_main_loop_run (loop=0x7f59b00012e0) > > at /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gmain.c:4034 > > #4 0x00005639a88d187a in iothread_run (opaque=0x5639aa512710) > > at /home/petmay01/linaro/qemu-for-merges/iothread.c:74 > > #5 0x00005639a8b8b911 in qemu_thread_start (args=0x5639aa49d6a0) > > at /home/petmay01/linaro/qemu-for-merges/util/qemu-thread-posix.c:502 > > #6 0x00007f59cf8fe6ba in start_thread (arg=0x7f59bf1f0700) at > > pthread_create.c:333 > > #7 0x00007f59cf63441d in clone () at > > ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 > > > > Thread 2 (Thread 0x7f59bf9f1700 (LWP 10537)): > > #0 0x00007f59cf62e4d9 in syscall () at > > ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38 > > #1 0x00005639a8b8b58f in qemu_futex_wait (f=0x5639a930a418 > > <rcu_call_ready_event>, val=4294967295) > > at /home/petmay01/linaro/qemu-for-merges/include/qemu/futex.h:29 > > #2 0x00005639a8b8b75e in qemu_event_wait (ev=0x5639a930a418 > > <rcu_call_ready_event>) > > at /home/petmay01/linaro/qemu-for-merges/util/qemu-thread-posix.c:442 > > #3 0x00005639a8ba41d3 in call_rcu_thread (opaque=0x0) > > at /home/petmay01/linaro/qemu-for-merges/util/rcu.c:261 > > #4 0x00005639a8b8b911 in qemu_thread_start (args=0x5639aa449ac0) > > at /home/petmay01/linaro/qemu-for-merges/util/qemu-thread-posix.c:502 > > #5 0x00007f59cf8fe6ba in start_thread (arg=0x7f59bf9f1700) at > > pthread_create.c:333 > > #6 0x00007f59cf63441d in clone () at > > ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 > > > > Thread 1 (Thread 0x7f59e9017fc0 (LWP 10534)): > > #0 0x00007f59cf628811 in __GI_ppoll (fds=0x5639aa5a1b90, nfds=6, > > timeout=<optimised out>, sigmask=0x0) at > > ../sysdeps/unix/sysv/linux/ppoll.c:50 > > #1 0x00005639a8b8534b in qemu_poll_ns (fds=0x5639aa5a1b90, nfds=6, > timeout=-1) > > at /home/petmay01/linaro/qemu-for-merges/util/qemu-timer.c:322 > > ---Type <return> to continue, or q <return> to quit--- > > #2 0x00005639a8b86527 in os_host_main_loop_wait (timeout=-1) > > at /home/petmay01/linaro/qemu-for-merges/util/main-loop.c:233 > > #3 0x00005639a8b865fe in main_loop_wait (nonblocking=0) > > at /home/petmay01/linaro/qemu-for-merges/util/main-loop.c:497 > > #4 0x00005639a88dab83 in main_loop () at > > /home/petmay01/linaro/qemu-for-merges/vl.c:1925 > > #5 0x00005639a88e25b9 in main (argc=21, argv=0x7ffd344d6138, > > envp=0x7ffd344d61e8) > > at /home/petmay01/linaro/qemu-for-merges/vl.c:4669 > > > > Backtrace in test-filter-mirror: > > Thread 1 (Thread 0x7fd24ab03740 (LWP 10533)): > > #0 0x00007fd24a0eb81d in __libc_recv (fd=8, buf=0x7ffcef3a8c58, n=4, > flags=0) > > at ../sysdeps/unix/sysv/linux/x86_64/recv.c:28 > > #1 0x000055e065d2d26a in test_mirror () > > at > /home/petmay01/linaro/qemu-for-merges/tests/test-filter-mirror.c:70 > > #2 0x00007fd24a67087b in test_case_run (tc=0x55e0676b6a00) > > at /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gtestutils.c:2158 > > #3 g_test_run_suite_internal (suite=suite@entry=0x55e0676b6060, > > path=path@entry=0x0) > > at /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gtestutils.c:2241 > > #4 0x00007fd24a670a43 in g_test_run_suite_internal > > (suite=suite@entry=0x55e0676b6040, > > path=path@entry=0x0) at > > /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gtestutils.c:2253 > > #5 0x00007fd24a670a43 in g_test_run_suite_internal > > (suite=suite@entry=0x55e0676b6020, > > path=path@entry=0x0) at > > /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gtestutils.c:2253 > > #6 0x00007fd24a670c4e in g_test_run_suite (suite=0x55e0676b6020) > > at /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gtestutils.c:2328 > > #7 0x00007fd24a670c71 in g_test_run () > > at /build/glib2.0-7ZsPUq/glib2.0-2.48.2/./glib/gtestutils.c:1596 > > #8 0x000055e065d2d4af in main (argc=1, argv=0x7ffcef3a9128) > > at > /home/petmay01/linaro/qemu-for-merges/tests/test-filter-mirror.c:92 > > > > > > thanks > > -- PMM > -- > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK >
