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Date: Fri, 24 Jun 2011 15:05:05 -0700
From: Ben Greear <greearb@...delatech.com>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Lockdep splat in 3.0.0-rc4
There are some patches to NFS in this kernel, but I don't think it
has anything to do with this lockdep splat.
I'm not too sure what was happening on this system when this splat
happened.
======================================================
[ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
3.0.0-rc4+ #1
------------------------------------------------------
ps/30182 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
(&lock->wait_lock){+.+...}, at: [<ffffffff8147da68>] rt_mutex_slowunlock+0x1d/0xdd
and this task is already holding:
(&(&sighand->siglock)->rlock){-.....}, at: [<ffffffff8105a357>] __lock_task_sighand+0x6e/0x9c
which would create a new lock dependency:s
(&(&sighand->siglock)->rlock){-.....} -> (&lock->wait_lock){+.+...}
but this new dependency connects a HARDIRQ-irq-safe lock:
(&(&sighand->siglock)->rlock){-.....}
... which became HARDIRQ-irq-safe at:
[<ffffffff8107a1c8>] __lock_acquire+0x2b4/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147e02d>] _raw_spin_lock_irqsave+0x4e/0x60
[<ffffffff8105a357>] __lock_task_sighand+0x6e/0x9c
[<ffffffff8105b0f3>] do_send_sig_info+0x27/0x70
[<ffffffff8105b3cf>] group_send_sig_info+0x4c/0x57
[<ffffffff8105b419>] kill_pid_info+0x3f/0x5a
[<ffffffff8104eb39>] it_real_fn+0x85/0xb4
[<ffffffff8106a40c>] __run_hrtimer+0xbe/0x1be
[<ffffffff8106a830>] hrtimer_interrupt+0xe5/0x1c0
[<ffffffff8102328c>] smp_apic_timer_interrupt+0x80/0x93
[<ffffffff81485293>] apic_timer_interrupt+0x13/0x20
[<ffffffff810e7d2c>] copy_page_range+0x29b/0x348
[<ffffffff8104802a>] dup_mm+0x32b/0x46b
[<ffffffff81048cfe>] copy_process+0xb53/0x1323
[<ffffffff810495d9>] do_fork+0x10b/0x2f1
[<ffffffff81010d4a>] sys_clone+0x23/0x25
[<ffffffff81484bf3>] stub_clone+0x13/0x20
to a HARDIRQ-irq-unsafe lock:
(&lock->wait_lock){+.+...}
... which became HARDIRQ-irq-unsafe at:
... [<ffffffff8107a23c>] __lock_acquire+0x328/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147df19>] _raw_spin_lock+0x36/0x45
[<ffffffff8147db77>] rt_mutex_slowlock+0x2b/0x132
[<ffffffff8147dd1c>] rt_mutex_lock+0x46/0x4a
[<ffffffff810a68e9>] rcu_boost_kthread+0x125/0x169
[<ffffffff81066e10>] kthread+0x7d/0x85
[<ffffffff814859e4>] kernel_thread_helper+0x4/0x10
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&lock->wait_lock);
local_irq_disable();
lock(&(&sighand->siglock)->rlock);
lock(&lock->wait_lock);
<Interrupt>
lock(&(&sighand->siglock)->rlock);
*** DEADLOCK ***
2 locks held by ps/30182:
#0: (&p->lock){+.+.+.}, at: [<ffffffff811345f0>] seq_read+0x38/0x368
#1: (&(&sighand->siglock)->rlock){-.....}, at: [<ffffffff8105a357>] __lock_task_sighand+0x6e/0x9c
the dependencies between HARDIRQ-irq-safe lock and the holding lock:
-> (&(&sighand->siglock)->rlock){-.....} ops: 24900587 {
IN-HARDIRQ-W at:
[<ffffffff8107a1c8>] __lock_acquire+0x2b4/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147e02d>] _raw_spin_lock_irqsave+0x4e/0x60
[<ffffffff8105a357>] __lock_task_sighand+0x6e/0x9c
[<ffffffff8105b0f3>] do_send_sig_info+0x27/0x70
[<ffffffff8105b3cf>] group_send_sig_info+0x4c/0x57
[<ffffffff8105b419>] kill_pid_info+0x3f/0x5a
[<ffffffff8104eb39>] it_real_fn+0x85/0xb4
[<ffffffff8106a40c>] __run_hrtimer+0xbe/0x1be
[<ffffffff8106a830>] hrtimer_interrupt+0xe5/0x1c0
[<ffffffff8102328c>] smp_apic_timer_interrupt+0x80/0x93
[<ffffffff81485293>] apic_timer_interrupt+0x13/0x20
[<ffffffff810e7d2c>] copy_page_range+0x29b/0x348
[<ffffffff8104802a>] dup_mm+0x32b/0x46b
[<ffffffff81048cfe>] copy_process+0xb53/0x1323
[<ffffffff810495d9>] do_fork+0x10b/0x2f1
[<ffffffff81010d4a>] sys_clone+0x23/0x25
[<ffffffff81484bf3>] stub_clone+0x13/0x20
INITIAL USE at:
[<ffffffff8107a2b3>] __lock_acquire+0x39f/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147e02d>] _raw_spin_lock_irqsave+0x4e/0x60
[<ffffffff8105a4bf>] flush_signals+0x1d/0x43
[<ffffffff8105a50d>] ignore_signals+0x28/0x2a
[<ffffffff81066e56>] kthreadd+0x3e/0x13d
[<ffffffff814859e4>] kernel_thread_helper+0x4/0x10
}
... key at: [<ffffffff81c45510>] __key.56507+0x0/0x8
... acquired at:
[<ffffffff81079bf6>] check_irq_usage+0x5d/0xbe
[<ffffffff8107aa1d>] __lock_acquire+0xb09/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147df19>] _raw_spin_lock+0x36/0x45
[<ffffffff8147da68>] rt_mutex_slowunlock+0x1d/0xdd
[<ffffffff8147db4a>] rt_mutex_unlock+0x22/0x24
[<ffffffff810a7d21>] __rcu_read_unlock+0x1c0/0x24e
[<ffffffff8105a287>] rcu_read_unlock+0x21/0x23
[<ffffffff8105a376>] __lock_task_sighand+0x8d/0x9c
[<ffffffff8116c56a>] do_task_stat+0x11d/0x84a
[<ffffffff8116cca6>] proc_tgid_stat+0xf/0x11
[<ffffffff811699f1>] proc_single_show+0x54/0x71
[<ffffffff81134739>] seq_read+0x181/0x368
[<ffffffff811199e2>] vfs_read+0xa6/0x102
[<ffffffff81119af7>] sys_read+0x45/0x6c
[<ffffffff81484852>] system_call_fastpath+0x16/0x1b
the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock:
-> (&lock->wait_lock){+.+...} ops: 594 {
HARDIRQ-ON-W at:
[<ffffffff8107a23c>] __lock_acquire+0x328/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147df19>] _raw_spin_lock+0x36/0x45
[<ffffffff8147db77>] rt_mutex_slowlock+0x2b/0x132
[<ffffffff8147dd1c>] rt_mutex_lock+0x46/0x4a
[<ffffffff810a68e9>] rcu_boost_kthread+0x125/0x169
[<ffffffff81066e10>] kthread+0x7d/0x85
[<ffffffff814859e4>] kernel_thread_helper+0x4/0x10
SOFTIRQ-ON-W at:
[<ffffffff8107a25d>] __lock_acquire+0x349/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147df19>] _raw_spin_lock+0x36/0x45
[<ffffffff8147db77>] rt_mutex_slowlock+0x2b/0x132
[<ffffffff8147dd1c>] rt_mutex_lock+0x46/0x4a
[<ffffffff810a68e9>] rcu_boost_kthread+0x125/0x169
[<ffffffff81066e10>] kthread+0x7d/0x85
[<ffffffff814859e4>] kernel_thread_helper+0x4/0x10
INITIAL USE at:
[<ffffffff8107a2b3>] __lock_acquire+0x39f/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147df19>] _raw_spin_lock+0x36/0x45
[<ffffffff8147db77>] rt_mutex_slowlock+0x2b/0x132
[<ffffffff8147dd1c>] rt_mutex_lock+0x46/0x4a
[<ffffffff810a68e9>] rcu_boost_kthread+0x125/0x169
[<ffffffff81066e10>] kthread+0x7d/0x85
[<ffffffff814859e4>] kernel_thread_helper+0x4/0x10
}
... key at: [<ffffffff824759a0>] __key.22188+0x0/0x8
... acquired at:
[<ffffffff81079bf6>] check_irq_usage+0x5d/0xbe
[<ffffffff8107aa1d>] __lock_acquire+0xb09/0xdd5
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147df19>] _raw_spin_lock+0x36/0x45
[<ffffffff8147da68>] rt_mutex_slowunlock+0x1d/0xdd
[<ffffffff8147db4a>] rt_mutex_unlock+0x22/0x24
[<ffffffff810a7d21>] __rcu_read_unlock+0x1c0/0x24e
[<ffffffff8105a287>] rcu_read_unlock+0x21/0x23
[<ffffffff8105a376>] __lock_task_sighand+0x8d/0x9c
[<ffffffff8116c56a>] do_task_stat+0x11d/0x84a
[<ffffffff8116cca6>] proc_tgid_stat+0xf/0x11
[<ffffffff811699f1>] proc_single_show+0x54/0x71
[<ffffffff81134739>] seq_read+0x181/0x368
[<ffffffff811199e2>] vfs_read+0xa6/0x102
[<ffffffff81119af7>] sys_read+0x45/0x6c
[<ffffffff81484852>] system_call_fastpath+0x16/0x1b
stack backtrace:
Pid: 30182, comm: ps Not tainted 3.0.0-rc4+ #1
Call Trace:
[<ffffffff8147e57b>] ? _raw_spin_unlock_irqrestore+0x6b/0x79
[<ffffffff81079b85>] check_usage+0x364/0x378
[<ffffffff81079bf6>] check_irq_usage+0x5d/0xbe
[<ffffffff8107aa1d>] __lock_acquire+0xb09/0xdd5
[<ffffffff810a6e6d>] ? rcu_start_gp+0x2e7/0x310
[<ffffffff8147da68>] ? rt_mutex_slowunlock+0x1d/0xdd
[<ffffffff8107b1ed>] lock_acquire+0xf4/0x14b
[<ffffffff8147da68>] ? rt_mutex_slowunlock+0x1d/0xdd
[<ffffffff8147df19>] _raw_spin_lock+0x36/0x45
[<ffffffff8147da68>] ? rt_mutex_slowunlock+0x1d/0xdd
[<ffffffff8147da68>] rt_mutex_slowunlock+0x1d/0xdd
[<ffffffff8147db4a>] rt_mutex_unlock+0x22/0x24
[<ffffffff810a7d21>] __rcu_read_unlock+0x1c0/0x24e
[<ffffffff8105a287>] rcu_read_unlock+0x21/0x23
[<ffffffff8105a376>] __lock_task_sighand+0x8d/0x9c
[<ffffffff8116c56a>] do_task_stat+0x11d/0x84a
[<ffffffff81077c0b>] ? register_lock_class+0x1e/0x336
[<ffffffff81078c91>] ? mark_lock+0x2d/0x22d
[<ffffffff81078c91>] ? mark_lock+0x2d/0x22d
[<ffffffff8107a2b3>] ? __lock_acquire+0x39f/0xdd5
[<ffffffff8110529a>] ? add_partial+0x1b/0x53
[<ffffffff81063bb3>] ? cpumask_weight+0xe/0xe
[<ffffffff8116cca6>] proc_tgid_stat+0xf/0x11
[<ffffffff811699f1>] proc_single_show+0x54/0x71
[<ffffffff81134739>] seq_read+0x181/0x368
[<ffffffff811199e2>] vfs_read+0xa6/0x102
[<ffffffff8111a031>] ? fget_light+0x35/0xac
[<ffffffff81119af7>] sys_read+0x45/0x6c
[<ffffffff81484852>] system_call_fastpath+0x16/0x1b
--
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc http://www.candelatech.com
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