[Linux-cachefs] kernel BUG at fs/fscache/cookie.c:547

[Shantanu Goel]

Hi David,

Thanks for responding and we will give that commit a try to see if it fixes the problem.


Shantanu




>________________________________
> From: David Howells <dhowells at redhat.com>
>To: Shantanu Goel <sgoel01 at yahoo.com> 
>Cc: dhowells at redhat.com; "linux-cachefs at redhat.com" <linux-cachefs at redhat.com> 
>Sent: Wednesday, September 11, 2013 11:46 AM
>Subject: Re: [Linux-cachefs] kernel BUG at fs/fscache/cookie.c:547
> 
>
>Shantanu Goel <sgoel01 at yahoo.com> wrote:
>
>> We have fscache deployed on several hosts and recently hit the bug below 
>> on a couple of hosts.  We searched the mailing lists to see if it had 
>> been reported but did not find anything similar.  We would appreciate 
>> any insight you might have into this problem.
>> We are running the 3.9.11 + fscache-20130702 branch from dhowells git tree as referenced here
>> https://www.redhat.com/archives/linux-cachefs/2013-July/msg00002.html.
>> ...
>> Sep  6 17:22:37 kernel BUG at fs/fscache/cookie.c:547!
>> ...
>> Sep  6 17:22:37 RIP: 0010:[<ffffffffa041387e>]  [<ffffffffa041387e>]
>> __fscache_cookie_put+0x4e/0x60 [fscache]
>> ...
>> Sep  6 17:22:37 Call Trace:
>> Sep  6 17:22:37  [<ffffffffa0413dd9>] __fscache_relinquish_cookie+0x109/0x260 [fscache]
>> Sep  6 17:22:37  [<ffffffffa043c461>] nfs_fscache_release_super_cookie+0x31/0xb0 [nfs]
>
>My suspicion is that you need to apply a fixup that got applied to
>kernel/wait.c to fix wait_on_atomic_t():
>
>    commit 42577ca8c3616baaafdd8f167b2e1fb959026081
>    Author: David Howells <dhowells at redhat.com>
>    Date:   Tue Jul 23 16:49:24 2013 +0100
>    Fix __wait_on_atomic_t() to call the action func if the counter != 0
>
>Alternatively, this commit and the commit set that you applied are all in
>linux-3.11 now.
>
>David
>
>
>