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[ChristianEhrhardt <1753604@xxxxxxxxxxxxxxxxxx>]

Thanks for the report Pooja,
this is fixed in v1.3.5

By that this in anything newer than Xenial via being upstream.

I need to take a look at backporting the suggested change to Xenial, but
that will probably not happen this week as I'm traveling.


** Also affects: libvirt (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: libvirt (Ubuntu Xenial)
       Status: New => Confirmed

** Changed in: libvirt (Ubuntu Xenial)
       Status: Confirmed => Triaged

** Changed in: libvirt (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1753604

Title:
  libvirt-bin nwfilter deadlock

Status in libvirt package in Ubuntu:
  Fix Released
Status in libvirt source package in Xenial:
  Triaged

Bug description:
  When deleting a VM, libvirt-bin intermittently hits a deadlock in nwfilter instantiation code.
  This is fixed in libvirt upstream, but the below commit is not cherrypicked in ubuntu yet:
  https://github.com/libvirt/libvirt/commit/2f5e24ba00d93c25b87561cb1f5259de175d70f9

  Thread 5 (Thread 0x7f2ce1c4b700 (LWP 13866)):
  #0  __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
  #1  0x00007f2cee30ce42 in __GI___pthread_mutex_lock (mutex=0x7f2c980008d0) at ../nptl/pthread_mutex_lock.c:115
  #2  0x00007f2cc7d7a62f in virNWFilterLockIface () from /usr/lib/libvirt/connection-driver/libvirt_driver_nwfilter.so
  #3  0x00007f2cc7d6ebf5 in ?? () from /usr/lib/libvirt/connection-driver/libvirt_driver_nwfilter.so
  #4  0x00007f2cc7d6f84c in virNWFilterTeardownFilter () from /usr/lib/libvirt/connection-driver/libvirt_driver_nwfilter.so
  ---Type <return> to continue, or q <return> to quit---
  #5  0x00007f2ceea32f0c in virDomainConfVMNWFilterTeardown () from /usr/lib/x86_64-linux-gnu/libvirt.so.0
  #6  0x00007f2cc73d5a86 in qemuProcessStop () from /usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
  #7  0x00007f2cc7420577 in ?? () from /usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
  #8  0x00007f2ceea857cf in virDomainDestroy () from /usr/lib/x86_64-linux-gnu/libvirt.so.0
  #9  0x000055c4ba3fe9db in ?? ()
  #10 0x00007f2ceeaf8f69 in virNetServerProgramDispatch () from /usr/lib/x86_64-linux-gnu/libvirt.so.0
  #11 0x00007f2ceeaf4478 in ?? () from /usr/lib/x86_64-linux-gnu/libvirt.so.0
  #12 0x00007f2cee9eb566 in ?? () from /usr/lib/x86_64-linux-gnu/libvirt.so.0
  #13 0x00007f2cee9eaae8 in ?? () from /usr/lib/x86_64-linux-gnu/libvirt.so.0
  #14 0x00007f2cee30a6ba in start_thread (arg=0x7f2ce1c4b700) at pthread_create.c:333
  #15 0x00007f2cee04041d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

  
  Thread 17 (Thread 0x7f2cc2801700 (LWP 8866)):
  #0  __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
  #1  0x00007f2cee30ce42 in __GI___pthread_mutex_lock (mutex=0x7f2cc7f8d280) at ../nptl/pthread_mutex_lock.c:115
  #2  0x00007f2cc7d6f6d3 in virNWFilterInstantiateFilterLate () from /usr/lib/libvirt/connection-driver/libvirt_driver_nwfilter.so
  #3  0x00007f2cc7d7a9b2 in ?? () from /usr/lib/libvirt/connection-driver/libvirt_driver_nwfilter.so
  #4  0x00007f2cee9eab12 in ?? () from /usr/lib/x86_64-linux-gnu/libvirt.so.0
  #5  0x00007f2cee30a6ba in start_thread (arg=0x7f2cc2801700) at pthread_create.c:333
  #6  0x00007f2cee04041d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

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