Messages in this thread | | | Date | Mon, 22 Aug 2011 14:16:21 +0100 | From | Al Viro <> | Subject | Re: INFO: possible circular locking dependency detected 3.1.0-rc2-00190-g3210d19 |
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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?
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