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

[Michael Niehren <902148@bugs.launchpad.net>]

Hi Stefan,

here is the output of gdb:

tux64@/usr/src/redhat/RPMS/x86_64# gdb -p 16606
GNU gdb (GDB) 7.3
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Attaching to process 16606
Reading symbols from /usr/bin/qemu-img...(no debugging symbols found)...done.
Reading symbols from /lib64/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /usr/lib/libgthread-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgthread-2.0.so.0
Reading symbols from /usr/lib/libglib-2.0.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libglib-2.0.so.0
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /lib64/libuuid.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libuuid.so.1
Reading symbols from /lib64/libaio.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib64/libaio.so.1
Reading symbols from /lib64/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
0x00007fd75a287f28 in bdrv_rw_co ()
(gdb) quit
A debugging session is active.


after compiling qemu-img with option --enable-debug everything works as expected.

hope that help's,

Greetings,
  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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