[Qemu-devel] [Bug 902148] Re: qemu-img V1.0 hangs on creating Image (0.15.1 runs)

[Michael Niehren]

Ok, sorry, here the output:

Thread 1 (Thread 0x7f57507c2740 (LWP 27263)):
#0  0x00007f57507da952 in qemu_aio_wait ()
#1  0x00007f57507dcf2d in bdrv_rw_co ()
#2  0x00007f57507dd2c2 in bdrv_pread ()
#3  0x00007f57507ed03a in qcow2_open ()
#4  0x00007f57507dc281 in bdrv_open_common ()
#5  0x00007f57507ddb73 in bdrv_open ()
#6  0x00007f57507ecafa in qcow2_create2 ()
#7  0x00007f57507ece58 in qcow2_create ()
#8  0x00007f57507e12c1 in bdrv_img_create ()
#9  0x00007f575080bfeb in img_create ()
#10 0x00007f574f340c7d in __libc_start_main () from /lib64/libc.so.6
#11 0x00007f57507d9359 in _start ()

I compiled the rpm's myself, so i am sure the only difference of both is the 
enable-debug Flag, same
source code. Here are my compile-flags on running configure:

    --disable-curses --disable-curl --audio-card-list=ac97 \
    --enable-kvm --enable-spice --enable-linux-aio \
    --enable-tcg-interpreter --enable-vnc-thread


Michael

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https://bugs.launchpad.net/bugs/902148

Title:
  qemu-img V1.0 hangs on creating Image (0.15.1 runs)

Status in QEMU:
  New

Bug description:
  Hi,

  i try the following command:
    /usr/bin/qemu-img create -f qcow2 test.img 10G

  if i run it on V0.15.1 it works, on V1.0 it hangs. Starting qemu-kvm
  hangs too, i think it's the same Bug.

  Strace on the hanging qemu-img ends on:

  select(5, [4], [], NULL, NULL)          = 1 (in [4])
  read(4, "\0", 16)                       = 1
  close(3)                                = 0
  open("test.img", O_RDONLY|O_NONBLOCK)   = 3
  fstat(3, {st_mode=S_IFREG|0644, st_size=131072, ...}) = 0
  close(3)                                = 0
  open("test.img", O_RDONLY|O_NONBLOCK)   = 3
  fstat(3, {st_mode=S_IFREG|0644, st_size=131072, ...}) = 0
  close(3)                                = 0
  stat("test.img", {st_mode=S_IFREG|0644, st_size=131072, ...}) = 0
  open("test.img", O_RDWR|O_CLOEXEC)      = 3
  lseek(3, 0, SEEK_END)                   = 131072

  next line in the strace on working qemu-img V0.15.1 is:
  pread(3, 
"QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\0\0\0\0\0"..., 512, 0) 
= 512
  ...

  The only linking difference i see is the libgthread on the new version
  V1.0. I am using glib V2.26.

  Can someone help ?

  best regards,
    Michael

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