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[Qemu-devel] [Bug 917824] Re: qemu loops/hangs on extending qcow2-disksp


From: Serge Hallyn
Subject: [Qemu-devel] [Bug 917824] Re: qemu loops/hangs on extending qcow2-diskspace
Date: Tue, 11 Sep 2012 16:35:22 -0000

** Changed in: qemu-kvm (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/917824

Title:
  qemu loops/hangs on extending qcow2-diskspace

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  New

Bug description:
  system is ubuntu 11-10 with qemu-kvm 0.14.1 (standard dpkg)

  while trying to install a software in a winXP-guest on a nearly empty
  disk within a qcow2-file, qemu stops answering console and vnc.

  gdb on original binary shows, that it doesn't really hang, but seems
  to endless loop

  recompiling the binary with debugging-symbols shows following problem:

  in block/qcow2-cluster.c:777 there's a loop over an allocation-list, but 
instead of stopping somewhere, the "next" points to the current one.
   QLIST_FOREACH(old_alloc, &s->cluster_allocs, next_in_flight) { ... }

  because I'm not firm with qemu-development, I don't know, which
  behaviour would be correct, but simply break this loop doesn't seem to
  work: a few moments later the process is again at this point (tried so
  by setting the register for comparison to 0)

  this situation is continuosly reproducible, but it always take at
  least 10-15min to get there, so please, if you have suggestion which I
  should try and report, try to give as much suggestions as possible in
  one action.

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