kernel-packages team mailing list archive

[Chris J Arges <1466135@xxxxxxxxxxxxxxxxxx>]

** Description changed:

  [Impact]
- Occasionally starting new containers or creating new net namespaces may fail because of improper refcounting of conntrack entires.
+ Occasionally starting new containers or creating new net namespaces may soft lockup because of improper refcounting of conntrack entires.
+ 
+ Softlockup backtrace:
+ [<ffffffff81723b69>] schedule_preempt_disabled+0x29/0x70
+ [<ffffffff817259d5>] __mutex_lock_slowpath+0x135/0x1b0
+ [<ffffffff811a2679>] ? __kmalloc+0x1e9/0x230
+ [<ffffffff81725a6f>] mutex_lock+0x1f/0x2f
+ [<ffffffff8161c2c1>] copy_net_ns+0x71/0x130
+ [<ffffffff8108f889>] create_new_namespaces+0xf9/0x180
+ [<ffffffff8108f983>] copy_namespaces+0x73/0xa0
+ [<ffffffff81065b16>] copy_process.part.26+0x9a6/0x16b0
+ [<ffffffff810669f5>] do_fork+0xd5/0x340
+ [<ffffffff810c8e8d>] ? call_rcu_sched+0x1d/0x20
+ [<ffffffff81066ce6>] SyS_clone+0x16/0x20
+ [<ffffffff81730089>] stub_clone+0x69/0x90
+ [<ffffffff8172fd2d>] ? system_call_fastpath+0x1a/0x1f
  
  [Test Case]
  bug 1403152 has a testcase which can occasionally hit this issue
  
  [Fix]
  $ git describe --contains e53376bef2cd97d3e3f61fdc677fb8da7d03d0da
  v3.14-rc3~36^2~28^2~12

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https://bugs.launchpad.net/bugs/1466135

Title:
  nf_conntrack releases a conntrack with non-zero refcnt

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  In Progress

Bug description:
  [Impact]
  Occasionally starting new containers or creating new net namespaces may soft lockup because of improper refcounting of conntrack entires.

  Softlockup backtrace:
  [<ffffffff81723b69>] schedule_preempt_disabled+0x29/0x70
  [<ffffffff817259d5>] __mutex_lock_slowpath+0x135/0x1b0
  [<ffffffff811a2679>] ? __kmalloc+0x1e9/0x230
  [<ffffffff81725a6f>] mutex_lock+0x1f/0x2f
  [<ffffffff8161c2c1>] copy_net_ns+0x71/0x130
  [<ffffffff8108f889>] create_new_namespaces+0xf9/0x180
  [<ffffffff8108f983>] copy_namespaces+0x73/0xa0
  [<ffffffff81065b16>] copy_process.part.26+0x9a6/0x16b0
  [<ffffffff810669f5>] do_fork+0xd5/0x340
  [<ffffffff810c8e8d>] ? call_rcu_sched+0x1d/0x20
  [<ffffffff81066ce6>] SyS_clone+0x16/0x20
  [<ffffffff81730089>] stub_clone+0x69/0x90
  [<ffffffff8172fd2d>] ? system_call_fastpath+0x1a/0x1f

  [Test Case]
  bug 1403152 has a testcase which can occasionally hit this issue

  [Fix]
  $ git describe --contains e53376bef2cd97d3e3f61fdc677fb8da7d03d0da
  v3.14-rc3~36^2~28^2~12

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