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[Qemu-devel] [Bug 1805256] Re: qemu-img hangs on high core count ARM sys
From: |
dann frazier |
Subject: |
[Qemu-devel] [Bug 1805256] Re: qemu-img hangs on high core count ARM system |
Date: |
Mon, 26 Nov 2018 23:54:21 -0000 |
ext4 filesystem, SATA drive:
(gdb) thread apply all bt
Thread 3 (Thread 0xffff9bffc9a0 (LWP 9015)):
#0 0x0000ffffaaa462cc in __GI___sigtimedwait (set=<optimized out>,
address@hidden, address@hidden,
timeout=0x3ff0000000000001, address@hidden)
at ../sysdeps/unix/sysv/linux/sigtimedwait.c:42
#1 0x0000ffffaab7dfac in __sigwait (address@hidden,
address@hidden) at ../sysdeps/unix/sysv/linux/sigwait.c:28
#2 0x0000aaaad998a628 in sigwait_compat (opaque=0xaaaae725c070)
at util/compatfd.c:36
#3 0x0000aaaad998bce0 in qemu_thread_start (args=<optimized out>)
at util/qemu-thread-posix.c:498
#4 0x0000ffffaab73088 in start_thread (arg=0xffffc528531f)
at pthread_create.c:463
#5 0x0000ffffaaae34ec in thread_start ()
at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78
Thread 2 (Thread 0xffffa0e779a0 (LWP 9014)):
#0 syscall () at ../sysdeps/unix/sysv/linux/aarch64/syscall.S:38
#1 0x0000aaaad998c9e8 in qemu_futex_wait (val=<optimized out>, f=<optimized
out>)
at /home/ubuntu/qemu/include/qemu/futex.h:29
#2 qemu_event_wait (address@hidden <rcu_call_ready_event>)
at util/qemu-thread-posix.c:442
#3 0x0000aaaad99a6834 in call_rcu_thread (opaque=<optimized out>)
at util/rcu.c:261
#4 0x0000aaaad998bce0 in qemu_thread_start (args=<optimized out>)
at util/qemu-thread-posix.c:498
#5 0x0000ffffaab73088 in start_thread (arg=0xffffc528542f)
at pthread_create.c:463
#6 0x0000ffffaaae34ec in thread_start ()
at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78
Thread 1 (Thread 0xffffa0fa8010 (LWP 9013)):
#0 0x0000ffffaaada154 in __GI_ppoll (fds=0xaaaae7291dc0, nfds=187650771816320,
timeout=<optimized out>, address@hidden, sigmask=0xffffc52852e0)
at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1 0x0000aaaad9987f00 in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized
out>,
__fds=<optimized out>) at /usr/include/aarch64-linux-gnu/bits/poll2.h:77
#2 qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>,
address@hidden) at util/qemu-timer.c:322
#3 0x0000aaaad9988f80 in os_host_main_loop_wait (timeout=-1)
at util/main-loop.c:233
#4 main_loop_wait (nonblocking=<optimized out>) at util/main-loop.c:497
#5 0x0000aaaad98b7a30 in convert_do_copy (s=0xffffc52854e8) at qemu-img.c:1980
#6 img_convert (argc=<optimized out>, argv=<optimized out>) at qemu-img.c:2456
#7 0x0000aaaad98b033c in main (argc=7, argv=<optimized out>) at qemu-img.c:4975
--
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https://bugs.launchpad.net/bugs/1805256
Title:
qemu-img hangs on high core count ARM system
Status in QEMU:
New
Bug description:
On the HiSilicon D06 system - a 96 core NUMA arm64 box - qemu-img
frequently hangs (~50% of the time) with this command:
qemu-img convert -f qcow2 -O qcow2 /tmp/cloudimg /tmp/cloudimg2
Where "cloudimg" is a standard qcow2 Ubuntu cloud image. This
qcow2->qcow2 conversion happens to be something uvtool does every time
it fetches images.
Once hung, attaching gdb gives the following backtrace:
(gdb) bt
#0 0x0000ffffae4f8154 in __GI_ppoll (fds=0xaaaae8a67dc0,
nfds=187650274213760,
timeout=<optimized out>, address@hidden, sigmask=0xffffc123b950)
at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1 0x0000aaaabbefaf00 in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized
out>,
__fds=<optimized out>) at /usr/include/aarch64-linux-gnu/bits/poll2.h:77
#2 qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>,
address@hidden) at util/qemu-timer.c:322
#3 0x0000aaaabbefbf80 in os_host_main_loop_wait (timeout=-1)
at util/main-loop.c:233
#4 main_loop_wait (nonblocking=<optimized out>) at util/main-loop.c:497
#5 0x0000aaaabbe2aa30 in convert_do_copy (s=0xffffc123bb58) at
qemu-img.c:1980
#6 img_convert (argc=<optimized out>, argv=<optimized out>) at
qemu-img.c:2456
#7 0x0000aaaabbe2333c in main (argc=7, argv=<optimized out>) at
qemu-img.c:4975
Reproduced w/ latest QEMU git (@ 53744e0a182)
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