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[Dave Chiluk <1354157@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1354234 ***
    https://bugs.launchpad.net/bugs/1354234

** This bug has been marked a duplicate of bug 1354234
   14.04: PANIC with "dcache shrink list corruption?" problem

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https://bugs.launchpad.net/bugs/1354157

Title:
  Soft Lockup in shrink_dentry_list+0x4e/0xe0

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

Bug description:
  BUG: soft lockup - CPU#1 stuck for 23s! [test.sh:1928]
  Kernel panic - not syncing: softlockup: hung tasks
  CPU: 1 PID: 1928 Comm: test.sh Tainted: G        W    3.13.0-24-generic #47-Ubuntu
  Hardware name: NEC Mercury CPU Module [NQ2250-902]/GC-MDC10-NJ, BIOS 5.6.0005 03/05/2014
  000000000000419b ffff88017fc43e28 ffffffff81715ac4 ffffffff81a5ee64
  ffff88017fc43ea0 ffffffff8170ecc5 0000000000000008 ffff88017fc43eb0
  ffff88017fc43e50 0000000000000086 00000000a954a952 0000000000000007
  Call Trace:
  <IRQ>  [<ffffffff81715ac4>] dump_stack+0x45/0x56
  [<ffffffff8170ecc5>] panic+0xc8/0x1d7
  [<ffffffff8110d015>] watchdog_timer_fn+0x165/0x170
  [<ffffffff8108e537>] __run_hrtimer+0x77/0x1d0
  [<ffffffff8110ceb0>] ? watchdog_cleanup+0x10/0x10
  [<ffffffff8108ed3f>] hrtimer_interrupt+0xef/0x230
  [<ffffffff81043087>] local_apic_timer_interrupt+0x37/0x60
  [<ffffffff8172887f>] smp_apic_timer_interrupt+0x3f/0x60
  [<ffffffff8172721d>] apic_timer_interrupt+0x6d/0x80
  <EOI>  [<ffffffff8171da2c>] ? _raw_spin_lock+0x1c/0x50
  [<ffffffff811d02ce>] shrink_dentry_list+0x4e/0xe0
  [<ffffffff811d10f8>] shrink_dcache_parent+0x28/0x70
  [<ffffffff81224826>] proc_flush_task+0xb6/0x1b0
  [<ffffffff81068540>] release_task+0x30/0x440
  [<ffffffff8109e1b1>] ? thread_group_cputime_adjusted+0x41/0x50
  [<ffffffff8106922f>] wait_consider_task+0x8df/0xb20
  [<ffffffff81069570>] do_wait+0x100/0x240
  [<ffffffff8106a6a4>] SyS_wait4+0x64/0xe0
  [<ffffffff810682a0>] ? task_stopped_code+0x60/0x60
  [<ffffffff817266bf>] tracesys+0xe1/0xe6


  Some machines are able to reliably reproduce this soft lockup using the following script.
  "
  #!/bin/bash

  mkdir -p testdir
  cd testdir

  while true; do if ! (exec >xx1 2>xx2 ; rm -f xx*; host www.google.com); then echo failed; fi ; done &
  while true; do ls -lR /proc >& /dev/null; done &
  while true; do lsof > /dev/null; done &
  while true; do ls -H >& /dev/null; done &

  wait
  "

  The following changes to dcache have been tested to resolve the issue.
  https://lkml.org/lkml/2014/5/4/7
  even though the original stack trace differs, but still ends in shrink_dentry_list.

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