On Mon, Apr 26, 2010 at 09:30:41PM -0400, Miles Lane wrote:
> Dave, is this the same? http://marc.info/?l=linux-kernel&m=127207512031810&w=2
looks like it to me. 499bca9b6d3243f9278a1f5a22d00e67acdd844d should have fixed it,
but it looks like that's present in -git7, so something is still missing..
Dave
> I produced this one by running "find /sys | xargs cat"
>
> [ 2982.773548] [ INFO: possible circular locking dependency detected ]
> [ 2982.773551] 2.6.34-rc5-git7 #33
> [ 2982.773554] -------------------------------------------------------
> [ 2982.773557] head/6335 is trying to acquire lock:
> [ 2982.773560] (&per_cpu(cpu_policy_rwsem, cpu)){+++++.}, at:
> [<ffffffff8139f077>] lock_policy_rwsem_read+0x4a/0x7a
> [ 2982.773571]
> [ 2982.773572] but task is already holding lock:
> [ 2982.773575] (s_active#102){++++.+}, at: [<ffffffff81153a23>]
> sysfs_read_file+0x8d/0x139
> [ 2982.773586]
> [ 2982.773586] which lock already depends on the new lock.
> [ 2982.773587]
> [ 2982.773590]
> [ 2982.773591] the existing dependency chain (in reverse order) is:
> [ 2982.773593]
> [ 2982.773594] -> #2 (s_active#102){++++.+}:
> [ 2982.773601] [<ffffffff8107654d>] __lock_acquire+0xb59/0xd11
> [ 2982.773608] [<ffffffff8107681a>] lock_acquire+0x115/0x150
> [ 2982.773613] [<ffffffff81154556>] sysfs_deactivate+0x9b/0xec
> [ 2982.773619] [<ffffffff81154d0a>] sysfs_addrm_finish+0x31/0x50
> [ 2982.773624] [<ffffffff81152e05>] sysfs_hash_and_remove+0x4e/0x65
> [ 2982.773629] [<ffffffff81155fc0>] sysfs_remove_group+0x8c/0xc5
> [ 2982.773634] [<ffffffffa00a3d26>]
> cpufreq_governor_dbs+0x2a6/0x33c [cpufreq_ondemand]
> [ 2982.773642] [<ffffffff8139da32>] __cpufreq_governor+0x5d/0xa3
> [ 2982.773648] [<ffffffff8139e4e2>] __cpufreq_remove_dev+0x231/0x2e2
> [ 2982.773653] [<ffffffff81454e40>] cpufreq_cpu_callback+0x62/0x7a
> [ 2982.773660] [<ffffffff8145d636>] ...
