On Tue, Apr 19, 2011 at 04:54:32PM +0200, Welterlen Benoit wrote:
> I have a bug with OCFS through configfs : to illustrate this, try :
>
> while true ; do ls -l /sys/kernel/config/cluster/ocfs2/heartbeat ; done&
>
> while true ; do echo 31>
> /sys/kernel/config/cluster/ocfs2/heartbeat/dead_threshold ; done&
Interesting!
> RIP [<ffffffffa01fd214>] configfs_readdir+0xf4/0x230 [configfs]
<snip>
> #8 [ffff880c6c8b3ee0] vfs_readdir at ffffffff8116c120
> #9 [ffff880c6c8b3f30] sys_getdents at ffffffff8116c2a9
I presume this is in the process that is ls(1)ing the directory?
> I've looked into the source code, but I found that a lock is useless :
> /* Only sets a new threshold if there are no active regions.
> *
> * No locking or otherwise interesting code is required for reading
> * o2hb_dead_threshold as it can't change once regions are active and
> * it's not interesting to anyone until then anyway. */
> static void o2hb_dead_threshold_set(unsigned int threshold)
> {
> if (threshold > O2HB_MIN_DEAD_THRESHOLD) {
> spin_lock(&o2hb_live_lock);
> if (list_empty(&o2hb_all_regions))
> o2hb_dead_threshold = threshold;
> spin_unlock(&o2hb_live_lock);
> }
> }
You're too late here. This is in the echo process (bash,
really). getdents() isn't happening.
The problem is almost certainly in configfs. It's a race
between setup and teardown of the virtual attribute files. If anyone
else has a cycle to look at it, great, otherwise I'll try to get to it
later this week.
Joel
--
"In a crisis, don't hide behind anything or anybody. They're going
to find you anyway."
- Paul "Bear" Bryant
http://www.jlbec.org/
jl...@evilplan.org
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