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Date: Wed, 2 Jul 2008 15:31:59 -0700
From: "Paul Menage" <menage@...gle.com>
To: "Max Krasnyansky" <maxk@...lcomm.com>
Cc: a.p.zijlstra@...llo.nl, pj@....com, vegard.nossum@...il.com,
linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] CGroups: Add a per-subsystem hierarchy lock
On Tue, Jul 1, 2008 at 8:55 PM, Max Krasnyansky <maxk@...lcomm.com> wrote:
> I was about to say "yeah, looks good" and then tried a couple of
> different hot-plug scenarious.
> We still have circular locking even with your patch
>
What sequence of actions do you do? I've not been able to reproduce a
lockdep failure.
Paul
> [ INFO: possible circular locking dependency detected ]
> 2.6.26-rc8 #4
> -------------------------------------------------------
> bash/2779 is trying to acquire lock:
> (&cpu_hotplug.lock){--..}, at: [<ffffffff8025e024>] get_online_cpus+0x24/0x40
>
> but task is already holding lock:
> (sched_domains_mutex){--..}, at: [<ffffffff8022f5e9>]
> partition_sched_domains+0x29/0x2b0
>
> which lock already depends on the new lock.
>
> the existing dependency chain (in reverse order) is:
>
> -> #2 (sched_domains_mutex){--..}:
> [<ffffffff8025988f>] __lock_acquire+0x9cf/0xe50
> [<ffffffff80259d6b>] lock_acquire+0x5b/0x80
> [<ffffffff804d12c4>] mutex_lock_nested+0x94/0x250
> [<ffffffff8022f5e9>] partition_sched_domains+0x29/0x2b0
> [<ffffffff80268f9d>] rebuild_sched_domains+0x9d/0x3f0
> [<ffffffff80269f05>] cpuset_handle_cpuhp+0x205/0x220
> [<ffffffff804d688f>] notifier_call_chain+0x3f/0x80
> [<ffffffff80250679>] __raw_notifier_call_chain+0x9/0x10
> [<ffffffff804c1748>] _cpu_down+0xa8/0x290
> [<ffffffff804c196b>] cpu_down+0x3b/0x60
> [<ffffffff804c2c68>] store_online+0x48/0xa0
> [<ffffffff803a46c4>] sysdev_store+0x24/0x30
> [<ffffffff802eebba>] sysfs_write_file+0xca/0x140
> [<ffffffff8029cb3b>] vfs_write+0xcb/0x170
> [<ffffffff8029ccd0>] sys_write+0x50/0x90
> [<ffffffff8020b92b>] system_call_after_swapgs+0x7b/0x80
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> -> #1 (&ss->hierarchy_mutex){--..}:
> [<ffffffff8025988f>] __lock_acquire+0x9cf/0xe50
> [<ffffffff80259d6b>] lock_acquire+0x5b/0x80
> [<ffffffff804d12c4>] mutex_lock_nested+0x94/0x250
> [<ffffffff80269d39>] cpuset_handle_cpuhp+0x39/0x220
> [<ffffffff804d688f>] notifier_call_chain+0x3f/0x80
> [<ffffffff80250679>] __raw_notifier_call_chain+0x9/0x10
> [<ffffffff804c1748>] _cpu_down+0xa8/0x290
> [<ffffffff804c196b>] cpu_down+0x3b/0x60
> [<ffffffff804c2c68>] store_online+0x48/0xa0
> [<ffffffff803a46c4>] sysdev_store+0x24/0x30
> [<ffffffff802eebba>] sysfs_write_file+0xca/0x140
> [<ffffffff8029cb3b>] vfs_write+0xcb/0x170
> [<ffffffff8029ccd0>] sys_write+0x50/0x90
> [<ffffffff8020b92b>] system_call_after_swapgs+0x7b/0x80
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> -> #0 (&cpu_hotplug.lock){--..}:
> [<ffffffff80259913>] __lock_acquire+0xa53/0xe50
> [<ffffffff80259d6b>] lock_acquire+0x5b/0x80
> [<ffffffff804d12c4>] mutex_lock_nested+0x94/0x250
> [<ffffffff8025e024>] get_online_cpus+0x24/0x40
> [<ffffffff8022fee1>] sched_getaffinity+0x11/0x80
> [<ffffffff8026e6d9>] __synchronize_sched+0x19/0x90
> [<ffffffff8022ed46>] detach_destroy_domains+0x46/0x50
> [<ffffffff8022f6b9>] partition_sched_domains+0xf9/0x2b0
> [<ffffffff80268f9d>] rebuild_sched_domains+0x9d/0x3f0
> [<ffffffff8026a858>] cpuset_common_file_write+0x2b8/0x5c0
> [<ffffffff8026657c>] cgroup_file_write+0x7c/0x1a0
> [<ffffffff8029cb3b>] vfs_write+0xcb/0x170
> [<ffffffff8029ccd0>] sys_write+0x50/0x90
> [<ffffffff8020b92b>] system_call_after_swapgs+0x7b/0x80
> [<ffffffffffffffff>] 0xffffffffffffffff
>
> other info that might help us debug this:
>
> 2 locks held by bash/2779:
> #0: (cgroup_mutex){--..}, at: [<ffffffff802653e2>] cgroup_lock+0x12/0x20
> #1: (sched_domains_mutex){--..}, at: [<ffffffff8022f5e9>]
> partition_sched_domains+0x29/0x2b0
>
> stack backtrace:
> Pid: 2779, comm: bash Not tainted 2.6.26-rc8 #4
>
> Call Trace:
> [<ffffffff80258c0c>] print_circular_bug_tail+0x8c/0x90
> [<ffffffff802589c4>] ? print_circular_bug_entry+0x54/0x60
> [<ffffffff80259913>] __lock_acquire+0xa53/0xe50
> [<ffffffff8025e024>] ? get_online_cpus+0x24/0x40
> [<ffffffff80259d6b>] lock_acquire+0x5b/0x80
> [<ffffffff8025e024>] ? get_online_cpus+0x24/0x40
> [<ffffffff804d12c4>] mutex_lock_nested+0x94/0x250
> [<ffffffff8025867d>] ? mark_held_locks+0x4d/0x90
> [<ffffffff8025e024>] get_online_cpus+0x24/0x40
> [<ffffffff8022fee1>] sched_getaffinity+0x11/0x80
> [<ffffffff8026e6d9>] __synchronize_sched+0x19/0x90
> [<ffffffff8022ed46>] detach_destroy_domains+0x46/0x50
> [<ffffffff8022f6b9>] partition_sched_domains+0xf9/0x2b0
> [<ffffffff80258801>] ? trace_hardirqs_on+0xc1/0xe0
> [<ffffffff80268f9d>] rebuild_sched_domains+0x9d/0x3f0
> [<ffffffff8026a858>] cpuset_common_file_write+0x2b8/0x5c0
> [<ffffffff80268c00>] ? cpuset_test_cpumask+0x0/0x20
> [<ffffffff80269f20>] ? cpuset_change_cpumask+0x0/0x20
> [<ffffffff80265260>] ? started_after+0x0/0x50
> [<ffffffff8026657c>] cgroup_file_write+0x7c/0x1a0
> [<ffffffff8029cb3b>] vfs_write+0xcb/0x170
> [<ffffffff8029ccd0>] sys_write+0x50/0x90
> [<ffffffff8020b92b>] system_call_after_swapgs+0x7b/0x80
>
> CPU3 attaching NULL sched-domain.
>
>
>
>
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