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[Bug 1403152] Re: unregister_netdevice: waiting for lo to become free. Usage count


Kernel stack trace when lxc-start process hang:

[27211131.602770] INFO: task lxc-start:25977 blocked for more than 120 seconds.
[27211131.602785]       Not tainted 3.13.0-40-generic #69-Ubuntu
[27211131.602789] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[27211131.602795] lxc-start       D 0000000000000000     0 25977      1 0x00000080
[27211131.602800]  ffff8806ee73dd40 0000000000000286 ffff880474bdb000 ffff8806ee73dfd8
[27211131.602803]  0000000000014480 0000000000014480 ffff880474bdb000 ffffffff81cdb760
[27211131.602806]  ffffffff81cdb764 ffff880474bdb000 00000000ffffffff ffffffff81cdb768
[27211131.602809] Call Trace:
[27211131.602821]  [<ffffffff81723b69>] schedule_preempt_disabled+0x29/0x70
[27211131.602825]  [<ffffffff817259d5>] __mutex_lock_slowpath+0x135/0x1b0
[27211131.602832]  [<ffffffff811a2679>] ? __kmalloc+0x1e9/0x230
[27211131.602835]  [<ffffffff81725a6f>] mutex_lock+0x1f/0x2f
[27211131.602840]  [<ffffffff8161c2c1>] copy_net_ns+0x71/0x130
[27211131.602845]  [<ffffffff8108f889>] create_new_namespaces+0xf9/0x180
[27211131.602848]  [<ffffffff8108f983>] copy_namespaces+0x73/0xa0
[27211131.602851]  [<ffffffff81065b16>] copy_process.part.26+0x9a6/0x16b0
[27211131.602854]  [<ffffffff810669f5>] do_fork+0xd5/0x340
[27211131.602857]  [<ffffffff810c8e8d>] ? call_rcu_sched+0x1d/0x20
[27211131.602859]  [<ffffffff81066ce6>] SyS_clone+0x16/0x20
[27211131.602863]  [<ffffffff81730089>] stub_clone+0x69/0x90
[27211131.602865]  [<ffffffff8172fd2d>] ? system_call_fastpath+0x1a/0x1f
[27211131.602869] INFO: task lxc-start:26342 blocked for more than 120 seconds.
[27211131.602874]       Not tainted 3.13.0-40-generic #69-Ubuntu

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  unregister_netdevice: waiting for lo to become free. Usage count

Status in linux package in Ubuntu:

Bug description:
  I currently running trusty latest patches and i get on these hardware
  and software:

  Ubuntu 3.13.0-43.72-generic

  processor	: 7
  vendor_id	: GenuineIntel
  cpu family	: 6
  model		: 77
  model name	: Intel(R) Atom(TM) CPU  C2758  @ 2.40GHz
  stepping	: 8
  microcode	: 0x11d
  cpu MHz		: 2400.000
  cache size	: 1024 KB
  physical id	: 0
  siblings	: 8
  core id		: 7
  cpu cores	: 8
  apicid		: 14
  initial apicid	: 14
  fpu		: yes
  fpu_exception	: yes
  cpuid level	: 11
  wp		: yes
  flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes rdrand lahf_lm 3dnowprefetch arat epb dtherm tpr_shadow vnmi flexpriority ept vpid tsc_adjust smep erms
  bogomips	: 4799.48
  clflush size	: 64
  cache_alignment	: 64
  address sizes	: 36 bits physical, 48 bits virtual
  power management:

  somehow reproducable the subjected error, and lxc is working still but
  not more managable until a reboot.

  managable means every command hangs.

  I saw there are alot of bugs but they seams to relate to older version
  and are closed, so i decided to file a new one?

  I run alot of machine with trusty an lxc containers but only these kind of machines produces these errors, all
  other don't show these odd behavior.

  thx in advance


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