lkml.org 
[lkml]   [2011]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: INFO: possible circular locking dependency detected 3.1.0-rc2-00190-g3210d19
On Mon, Aug 22, 2011 at 09:09:14AM -0400, Josh Boyer wrote:

> We've had a report of this on 3.0.1 as well. Slightly different
> scenario and fs, but the locks in question are the same.
> https://bugzilla.redhat.com/show_bug.cgi?id=730998
>
> It seems that with CONFIG_PROVE_LOCKING on, might_fault will always
> attempt to grab mm->mmap_sem. The common flow here is that getdents
> calls filldir, which calls copy_to_user, which is what is calling
> might_fault.
>
> Beyond that, I'm a bit over my head at the moment because I don't know
> if the VFS is right and we just need some more lockdep annotations or
> if there really is a problem.

Don't grab ->i_mutex in ->evict_inode(). Why are you doing that, anyway?


\
 
 \ /
  Last update: 2011-08-22 15:19    [W:0.121 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site