kernel-packages team mailing list archive

[Dave Chiluk <1354234@xxxxxxxxxxxxxxxxxx>]

Here's a soft lockup that is reportedly fixed by this patchset

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


Also 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
"
Although I personally have not been able to reproduce using this script.

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https://bugs.launchpad.net/bugs/1354234

Title:
  14.04: PANIC with "dcache shrink list corruption?" problem

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:
  Hello,

  14.04 kernel linux_3.13.0-32.57 panicked because of "dcache shrink list 
  corruption?" problem. Please see followings: 
  - details at https://lkml.org/lkml/2014/5/2/555. 
  - argument at https://lkml.org/lkml/2014/4/29/402 
  - patch set at https://lkml.org/lkml/2014/5/4/7 

  One of 9 patches has been applied to linux_3.13.0-32.57 already. 
  Could you apply other 8 patches to the next 14.04 kernel ? 
  We will need the kernel at the beginning of August badly. If we will not 
  be able to get it, we will not be able to start tests before service in. 
  Could you release it as soon as possible ? 

  We applied other 8 patches to linux_3.13.0-32.57 and now the panic does 
  not occur. 

  Public Bug URL: 
  https://lkml.org/lkml/2014/5/2/555

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