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Date: Mon, 26 Nov 2018 22:53:57 -0000
From: dann frazier <dann.frazier@canonical.com>
Reply-To: Bug 1805256 <1805256@bugs.launchpad.net>
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Subject: [Qemu-devel] [Bug 1805256] [NEW] qemu-img hangs on high core count
 ARM system
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To: qemu-devel@nongnu.org

Public bug reported:

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=3D0xaaaae8a67dc0, nfds=3D18765027=
4213760, =

    timeout=3D<optimized out>, timeout@entry=3D0x0, sigmask=3D0xffffc123b95=
0)
    at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x0000aaaabbefaf00 in ppoll (__ss=3D0x0, __timeout=3D0x0, __nfds=3D<opt=
imized out>, =

    __fds=3D<optimized out>) at /usr/include/aarch64-linux-gnu/bits/poll2.h=
:77
#2  qemu_poll_ns (fds=3D<optimized out>, nfds=3D<optimized out>, =

    timeout=3Dtimeout@entry=3D-1) at util/qemu-timer.c:322
#3  0x0000aaaabbefbf80 in os_host_main_loop_wait (timeout=3D-1)
    at util/main-loop.c:233
#4  main_loop_wait (nonblocking=3D<optimized out>) at util/main-loop.c:497
#5  0x0000aaaabbe2aa30 in convert_do_copy (s=3D0xffffc123bb58) at qemu-img.=
c:1980
#6  img_convert (argc=3D<optimized out>, argv=3D<optimized out>) at qemu-im=
g.c:2456
#7  0x0000aaaabbe2333c in main (argc=3D7, argv=3D<optimized out>) at qemu-i=
mg.c:4975

Reproduced w/ latest QEMU git (@ 53744e0a182)

** Affects: qemu
     Importance: Undecided
         Status: New

-- =

You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
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=3D0xaaaae8a67dc0, nfds=3D187650=
274213760, =

      timeout=3D<optimized out>, timeout@entry=3D0x0, sigmask=3D0xffffc123b=
950)
      at ../sysdeps/unix/sysv/linux/ppoll.c:39
  #1  0x0000aaaabbefaf00 in ppoll (__ss=3D0x0, __timeout=3D0x0, __nfds=3D<o=
ptimized out>, =

      __fds=3D<optimized out>) at /usr/include/aarch64-linux-gnu/bits/poll2=
.h:77
  #2  qemu_poll_ns (fds=3D<optimized out>, nfds=3D<optimized out>, =

      timeout=3Dtimeout@entry=3D-1) at util/qemu-timer.c:322
  #3  0x0000aaaabbefbf80 in os_host_main_loop_wait (timeout=3D-1)
      at util/main-loop.c:233
  #4  main_loop_wait (nonblocking=3D<optimized out>) at util/main-loop.c:497
  #5  0x0000aaaabbe2aa30 in convert_do_copy (s=3D0xffffc123bb58) at qemu-im=
g.c:1980
  #6  img_convert (argc=3D<optimized out>, argv=3D<optimized out>) at qemu-=
img.c:2456
  #7  0x0000aaaabbe2333c in main (argc=3D7, argv=3D<optimized out>) at qemu=
-img.c:4975

  Reproduced w/ latest QEMU git (@ 53744e0a182)

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