[Trusty] Hang and corruption in dcache_shrink_list

[Tim Gardner]

On 08/08/2014 12:18 PM, Dave Chiluk wrote:
> BugLink: http://bugs.launchpad.net/bugs/1354157
> 
> The patchset described here and committed to upstream
> https://lkml.org/lkml/2014/5/4/7
> can be cleanly cherry-picked, and has been applied to
> git://kernel.ubuntu.com/chiluk/ubuntu-trusty.git branch 70318
> The end user reports that the above patch set fixes the issue.
> 
> I'd like to get some additional review on this patchset before
> submitting it for actual inclusion.
> 
> That all being said, I think we should strongly consider pulling in
> 046b961b4
> b2b80195d
> 9f12600fe
> and b2b80195d88
> as well, as these look to be more related to a possible lock starvation
> case.
> 
> Open for discussion.
> Dave.
> 

I did an identical patch set for a different bug
(http://bugs.launchpad.net/bugs/1354234). Shall we dup them ?

The following changes since commit 0a0caf5157bffb6340de804b3a8c94e045f68fb7:

  ahci_xgene: Use correct OOB tunning parameters for APM X-Gene SoC AHCI
SATA Host controller driver. (2014-08-12 06:40:52 -0600)

are available in the git repository at:

  git://kernel.ubuntu.com/rtg/ubuntu-trusty.git
lp1354234-dcache-shrink-list-corruption

for you to fetch changes up to 3b1cbde08418dbd8cc2d819b9e7412303818deba:

  dcache: don't need rcu in shrink_dentry_list() (2014-08-12 07:47:39 -0600)

----------------------------------------------------------------
Al Viro (7):
      fold d_kill() and d_free()
      fold try_prune_one_dentry()
      new helper: dentry_free()
      expand the call of dentry_lru_del() in dentry_kill()
      dentry_kill(): don't try to remove from shrink list
      don't remove from shrink list in select_collect()
      more graceful recovery in umount_collect()

Miklos Szeredi (1):
      dcache: don't need rcu in shrink_dentry_list()

 fs/dcache.c            | 315
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 include/linux/dcache.h |   2 ++
 2 files changed, 103 insertions(+), 214 deletions(-)


-- 
Tim Gardner tim.gardner at canonical.com