On Tue, Nov 08, 2011 at 05:44:52PM -0600, Clark Williams wrote:

On Tue, 8 Nov 2011 22:02:32 +0100 (CET)
Thomas Gleixner [off-list ref] wrote:

quoted

On Tue, 8 Nov 2011, Clark Williams wrote:

quoted

Got the following splat on boot (f15 64-bit laptop, quad-core i7):

[  146.609030] 
[  146.609031] =======================================================
[  146.609033] [ INFO: possible circular locking dependency detected ]
[  146.609035] 3.0.8-rt22+ #27
[  146.609036] -------------------------------------------------------
[  146.609038] dconf-service/9046 is trying to acquire lock:
[  146.609040]  (&sb->s_type->i_mutex_key#13){+.+.+.}, at: [<ffffffff811adcc4>] ext4_evict_inode+0x44/0x26f
[  146.609047] 
[  146.609048] but task is already holding lock:
[  146.609049]  (&mm->mmap_sem){++++++}, at: [<ffffffff81108ee6>] sys_munmap+0x36/0x5b
[  146.609053] 

That's an upstream problem which got pulled into 3.0 stable via commit
2526f36894 (upstream 2581fdc810) but lacks the followup upstream fix
 .  The latter unfortunately has no Cc: stable tag ....

Ted?

Thanks,

	tglx

Thanks Thomas. I cherry-picked 8c0bec2, rebuilt with the same config
and have booted the resulting kernel with no lockdep splats.

Great, I've queued it up for the next 3.0-stable release.

greg k-h