From: Dave Jones <davej@redhat.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: workqueue lockdep bug.
Date: Mon, 14 Aug 2006 14:33:19 -0400 [thread overview]
Message-ID: <20060814183319.GJ15569@redhat.com> (raw)
Andrew,
I merged the workqueue changes from -mm into the Fedora-devel kernel to
kill off those billion cpufreq lockdep warnings. The bug has now mutated
into this:
(Trimmed version of log from https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=202223)
Dave
> Breaking affinity for irq 185
> Breaking affinity for irq 193
> Breaking affinity for irq 209
> CPU 1 is now offline
> lockdep: not fixing up alternatives.
>
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.17-1.2548.fc6 #1
> -------------------------------------------------------
> pm-hibernate/4335 is trying to acquire lock:
> ((cpu_chain).rwsem){..--}, at: [<c0430fa4>] blocking_notifier_call_chain+0x11/0x2d
>
> but task is already holding lock:
> (workqueue_mutex){--..}, at: [<c0612820>] mutex_lock+0x21/0x24
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #1 (workqueue_mutex){--..}:
> [<c043c08e>] lock_acquire+0x4b/0x6d
> [<c06126b1>] __mutex_lock_slowpath+0xbc/0x20a
> [<c0612820>] mutex_lock+0x21/0x24
> [<c0433c25>] workqueue_cpu_callback+0xfd/0x1ee
> [<c0614ef5>] notifier_call_chain+0x20/0x31
> [<c0430fb0>] blocking_notifier_call_chain+0x1d/0x2d
> [<c043f4c5>] _cpu_down+0x47/0x1c4
> [<c043f805>] disable_nonboot_cpus+0x9b/0x11a
> [<c0445b32>] prepare_processes+0xe/0x41
> [<c0445d87>] pm_suspend_disk+0x9/0xf3
> [<c0444e12>] enter_state+0x54/0x1b7
> [<c0444ffb>] state_store+0x86/0x9c
> [<c04a9f88>] subsys_attr_store+0x20/0x25
> [<c04aa08c>] sysfs_write_file+0xab/0xd1
> [<c04732cb>] vfs_write+0xab/0x157
> [<c0473910>] sys_write+0x3b/0x60
> [<c0403faf>] syscall_call+0x7/0xb
>
> -> #0 ((cpu_chain).rwsem){..--}:
> [<c043c08e>] lock_acquire+0x4b/0x6d
> [<c04390a0>] down_read+0x2d/0x40
> [<c0430fa4>] blocking_notifier_call_chain+0x11/0x2d
> [<c043f5aa>] _cpu_down+0x12c/0x1c4
> [<c043f805>] disable_nonboot_cpus+0x9b/0x11a
> [<c0445b32>] prepare_processes+0xe/0x41
> [<c0445d87>] pm_suspend_disk+0x9/0xf3
> [<c0444e12>] enter_state+0x54/0x1b7
> [<c0444ffb>] state_store+0x86/0x9c
> [<c04a9f88>] subsys_attr_store+0x20/0x25
> [<c04aa08c>] sysfs_write_file+0xab/0xd1
> [<c04732cb>] vfs_write+0xab/0x157
> [<c0473910>] sys_write+0x3b/0x60
> [<c0403faf>] syscall_call+0x7/0xb
>
> other info that might help us debug this:
>
> 2 locks held by pm-hibernate/4335:
> #0: (cpu_add_remove_lock){--..}, at: [<c0612820>] mutex_lock+0x21/0x24
> #1: (workqueue_mutex){--..}, at: [<c0612820>] mutex_lock+0x21/0x24
>
> stack backtrace:
> [<c04051ee>] show_trace_log_lvl+0x58/0x159
> [<c04057ea>] show_trace+0xd/0x10
> [<c0405903>] dump_stack+0x19/0x1b
> [<c043b176>] print_circular_bug_tail+0x59/0x64
> [<c043b98e>] __lock_acquire+0x80d/0x99c
> [<c043c08e>] lock_acquire+0x4b/0x6d
> [<c04390a0>] down_read+0x2d/0x40
> [<c0430fa4>] blocking_notifier_call_chain+0x11/0x2d
> [<c043f5aa>] _cpu_down+0x12c/0x1c4
> [<c043f805>] disable_nonboot_cpus+0x9b/0x11a
> [<c0445b32>] prepare_processes+0xe/0x41
> [<c0445d87>] pm_suspend_disk+0x9/0xf3
> [<c0444e12>] enter_state+0x54/0x1b7
> [<c0444ffb>] state_store+0x86/0x9c
> [<c04a9f88>] subsys_attr_store+0x20/0x25
> [<c04aa08c>] sysfs_write_file+0xab/0xd1
> [<c04732cb>] vfs_write+0xab/0x157
> [<c0473910>] sys_write+0x3b/0x60
> [<c0403faf>] syscall_call+0x7/0xb
> DWARF2 unwinder stuck at syscall_call+0x7/0xb
> Leftover inexact backtrace:
> [<c04057ea>] show_trace+0xd/0x10
> [<c0405903>] dump_stack+0x19/0x1b
> [<c043b176>] print_circular_bug_tail+0x59/0x64
> [<c043b98e>] __lock_acquire+0x80d/0x99c
> [<c043c08e>] lock_acquire+0x4b/0x6d
> [<c04390a0>] down_read+0x2d/0x40
> [<c0430fa4>] blocking_notifier_call_chain+0x11/0x2d
> [<c043f5aa>] _cpu_down+0x12c/0x1c4
> [<c043f805>] disable_nonboot_cpus+0x9b/0x11a
> [<c0445b32>] prepare_processes+0xe/0x41
> [<c0445d87>] pm_suspend_disk+0x9/0xf3
> [<c0444e12>] enter_state+0x54/0x1b7
> [<c0444ffb>] state_store+0x86/0x9c
> [<c04a9f88>] subsys_attr_store+0x20/0x25
> [<c04aa08c>] sysfs_write_file+0xab/0xd1
> [<c04732cb>] vfs_write+0xab/0x157
> [<c0473910>] sys_write+0x3b/0x60
> [<c0403faf>] syscall_call+0x7/0xb
> CPU1 is down
> Stopping tasks:
--
http://www.codemonkey.org.uk
next reply other threads:[~2006-08-14 18:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-14 18:33 Dave Jones [this message]
2006-08-15 6:36 ` workqueue lockdep bug Andrew Morton
[not found] ` <3888a5cd0608161631j629ae4a2l929d9b8fead6a2d8@mail.gmail.com>
2006-08-17 1:07 ` Jiri Slaby
2006-08-17 1:17 ` Jiri Slaby
2006-09-08 9:19 ` Jiri Slaby
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