From: Marcus Furlong <furlongm@hotmail.com>
To: linux-kernel@vger.kernel.org
Subject: Re: 2.6.26.4 hard-unsafe lock order detected (drm-related?)
Date: Thu, 11 Sep 2008 19:21:24 +0100 [thread overview]
Message-ID: <gabnj1$nh4$1@ger.gmane.org> (raw)
In-Reply-To: gaavrs$of3$1@ger.gmane.org
On Thursday 11 September 2008 12:36 in <gaavrs$of3$1@ger.gmane.org>, Marcus
Furlong wrote:
> On Wednesday 10 September 2008 19:15 in
> <1221070510.4415.207.camel@twins.programming.kicks-ass.net>, Peter Zijlstra
> wrote:
>
>> On Wed, 2008-09-10 at 17:48 +0100, Marcus Furlong wrote:
>>> Hi,
>>>
>>> Just found this in dmesg, if any more info is needed let me know.
>>
>> Dave, have you ever seen this one before?
>>
>> Marcus, can you reproduce? - if so, could you try .27-rc6 to see if it
>> is still valid?
>
> Can't reproduce so far.
Actually just found another one on 2.6.26.4. Not sure what I was doing at the
time though. Tried 27-rc6 for a few hours last night and it didn't recoccur.
I'll see if I can pinpoint what causes it.
[16869.930402] ======================================================
[16869.930413] [ INFO: hard-safe -> hard-unsafe lock order detected ]
[16869.930418] 2.6.26.4 #1
[16869.930422] ------------------------------------------------------
[16869.930427] swapper/0 [HC0[0]:SC1[2]:HE0:SE0] is trying to acquire:
[16869.930432] (&dev->lock.spinlock){-+..}, at: [<f9072ecc>]
drm_lock_take+0x1c/0xc0 [drm]
[16869.930460]
[16869.930461] and this task is already holding:
[16869.930464] (&dev->tasklet_lock){++..}, at: [<f907254e>]
drm_locked_tasklet_func+0x1e/0x90 [drm]
[16869.930485] which would create a new lock dependency:
[16869.930490] (&dev->tasklet_lock){++..} -> (&dev->lock.spinlock){-+..}
[16869.930510]
[16869.930511] but this new dependency connects a hard-irq-safe lock:
[16869.930517] (&dev->tasklet_lock){++..}
[16869.930524] ... which became hard-irq-safe at:
[16869.930529] [<c016495d>] __lock_acquire+0x82d/0xfb0
[16869.930544] [<c0165141>] lock_acquire+0x61/0x80
[16869.930556] [<c0496de3>] _spin_lock_irqsave+0x43/0x60
[16869.930571] [<f907260d>] drm_locked_tasklet+0x4d/0xa0 [drm]
[16869.930592] [<f9048bf3>] i915_driver_irq_handler+0x1c3/0x1f0 [i915]
[16869.930611] [<c016f048>] handle_IRQ_event+0x28/0x60
[16869.930624] [<c01704f8>] handle_fasteoi_irq+0x78/0xf0
[16869.930636] [<c011d719>] do_IRQ+0x79/0xc0
[16869.930649] [<ffffffff>] 0xffffffff
[16869.930661]
[16869.930662] to a hard-irq-unsafe lock:
[16869.930668] (&dev->lock.spinlock){-+..}
[16869.930674] ... which became hard-irq-unsafe at:
[16869.930679] ... [<c0164736>] __lock_acquire+0x606/0xfb0
[16869.930696] [<c0165141>] lock_acquire+0x61/0x80
[16869.930708] [<c0496e8b>] _spin_lock_bh+0x3b/0x50
[16869.930724] [<f907319e>] drm_lock+0x8e/0x310 [drm]
[16869.930747] [<f90713e9>] drm_ioctl+0x1b9/0x2f0 [drm]
[16869.930773] [<c01a30eb>] vfs_ioctl+0x6b/0x80
[16869.930785] [<c01a3157>] do_vfs_ioctl+0x57/0x2b0
[16869.930798] [<c01a33e9>] sys_ioctl+0x39/0x60
[16869.930809] [<c011a505>] sysenter_past_esp+0x6a/0xb1
[16869.930821] [<ffffffff>] 0xffffffff
[16869.930837]
[16869.930838] other info that might help us debug this:
[16869.930839]
[16869.930842] 1 lock held by swapper/0:
[16869.930844] #0: (&dev->tasklet_lock){++..}, at: [<f907254e>]
drm_locked_tasklet_func+0x1e/0x90 [drm]
[16869.930858]
[16869.930859] the hard-irq-safe lock's dependencies:
[16869.930862] -> (&dev->tasklet_lock){++..} ops: 0 {
[16869.930870] initial-use at:
[16869.930873] [<c016424d>]
__lock_acquire+0x11d/0xfb0
[16869.930932] [<c0165141>]
lock_acquire+0x61/0x80
[16869.930987] [<c0496de3>]
_spin_lock_irqsave+0x43/0x60
[16869.930987] [<f9073007>]
drm_unlock+0x27/0xc0 [drm]
[16869.930987] [<f90713e9>]
drm_ioctl+0x1b9/0x2f0 [drm]
[16869.930987] [<c01a30eb>]
vfs_ioctl+0x6b/0x80
[16869.930987] [<c01a3157>]
do_vfs_ioctl+0x57/0x2b0
[16869.930987] [<c01a33e9>]
sys_ioctl+0x39/0x60
[16869.930987] [<c011a505>]
sysenter_past_esp+0x6a/0xb1
[16869.930987] [<ffffffff>] 0xffffffff
[16869.930987] in-hardirq-W at:
[16869.930987] [<c016495d>]
__lock_acquire+0x82d/0xfb0
[16869.930987] [<c0165141>]
lock_acquire+0x61/0x80
[16869.930987] [<c0496de3>]
_spin_lock_irqsave+0x43/0x60
[16869.930987] [<f907260d>]
drm_locked_tasklet+0x4d/0xa0 [drm]
[16869.930987] [<f9048bf3>]
i915_driver_irq_handler+0x1c3/0x1f0 [i915]
[16869.930987] [<c016f048>]
handle_IRQ_event+0x28/0x60
[16869.930987] [<c01704f8>]
handle_fasteoi_irq+0x78/0xf0
[16869.930987] [<c011d719>]
do_IRQ+0x79/0xc0
[16869.930987] [<ffffffff>] 0xffffffff
[16869.930987] in-softirq-W at:
[16869.930987] [<c01645ef>]
__lock_acquire+0x4bf/0xfb0
[16869.930987] [<c0165141>]
lock_acquire+0x61/0x80
[16869.930987] [<c0496de3>]
_spin_lock_irqsave+0x43/0x60
[16869.930987] [<f907254e>]
drm_locked_tasklet_func+0x1e/0x90 [drm]
[16869.930987] [<c01476eb>]
tasklet_hi_action+0x5b/0xd0
[16869.930987] [<c01474e4>]
__do_softirq+0x74/0xe0
[16869.930987] [<c011d665>]
do_softirq+0x95/0xd0
[16869.930987] [<ffffffff>] 0xffffffff
[16869.930987] }
[16869.930987] ... key at: [<f907e444>] __key.23164+0x0/0xffff90cb [drm]
[16869.930987]
[16869.930987] the hard-irq-unsafe lock's dependencies:
[16869.930987] -> (&dev->lock.spinlock){-+..} ops: 0 {
[16869.930987] initial-use at:
[16869.930987] [<c016424d>]
__lock_acquire+0x11d/0xfb0
[16869.930987] [<c0165141>]
lock_acquire+0x61/0x80
[16869.930987] [<c0496e8b>]
_spin_lock_bh+0x3b/0x50
[16869.930987] [<f907319e>]
drm_lock+0x8e/0x310 [drm]
[16869.930987] [<f90713e9>]
drm_ioctl+0x1b9/0x2f0 [drm]
[16869.930987] [<c01a30eb>]
vfs_ioctl+0x6b/0x80
[16869.930987] [<c01a3157>]
do_vfs_ioctl+0x57/0x2b0
[16869.930987] [<c01a33e9>]
sys_ioctl+0x39/0x60
[16869.930987] [<c011a505>]
sysenter_past_esp+0x6a/0xb1
[16869.930987] [<ffffffff>] 0xffffffff
[16869.930987] in-softirq-W at:
[16869.930987] [<c01645ef>]
__lock_acquire+0x4bf/0xfb0
[16869.930987] [<c0165141>]
lock_acquire+0x61/0x80
[16869.930987] [<c0496e8b>]
_spin_lock_bh+0x3b/0x50
[16869.930987] [<f9072ecc>]
drm_lock_take+0x1c/0xc0 [drm]
[16869.930987] [<f907256a>]
drm_locked_tasklet_func+0x3a/0x90 [drm]
[16869.930987] [<c01476eb>]
tasklet_hi_action+0x5b/0xd0
[16869.930987] [<c01474e4>]
__do_softirq+0x74/0xe0
[16869.930987] [<c011d665>]
do_softirq+0x95/0xd0
[16869.930987] [<ffffffff>] 0xffffffff
[16869.930987] hardirq-on-W at:
[16869.930987] [<c0164736>]
__lock_acquire+0x606/0xfb0
[16869.930987] [<c0165141>]
lock_acquire+0x61/0x80
[16869.930987] [<c0496e8b>]
_spin_lock_bh+0x3b/0x50
[16869.930987] [<f907319e>]
drm_lock+0x8e/0x310 [drm]
[16869.930987] [<f90713e9>]
drm_ioctl+0x1b9/0x2f0 [drm]
[16869.930987] [<c01a30eb>]
vfs_ioctl+0x6b/0x80
[16869.930987] [<c01a3157>]
do_vfs_ioctl+0x57/0x2b0
[16869.930987] [<c01a33e9>]
sys_ioctl+0x39/0x60
[16869.930987] [<c011a505>]
sysenter_past_esp+0x6a/0xb1
[16869.930987] [<ffffffff>] 0xffffffff
[16869.930987] }
[16869.930987] ... key at: [<f907e43c>] __key.23165+0x0/0xffff90d3 [drm]
[16869.930987]
[16869.930987] stack backtrace:
[16869.930987] Pid: 0, comm: swapper Not tainted 2.6.26.4 #1
[16869.930987] [<c0164072>] check_usage+0x252/0x260
[16869.930987] [<c0164c18>] __lock_acquire+0xae8/0xfb0
[16869.930987] [<c0135534>] ? hrtick_start_fair+0x114/0x170
[16869.930987] [<c0165141>] lock_acquire+0x61/0x80
[16869.930987] [<f9072ecc>] ? drm_lock_take+0x1c/0xc0 [drm]
[16869.930987] [<c0496e8b>] _spin_lock_bh+0x3b/0x50
[16869.930987] [<f9072ecc>] ? drm_lock_take+0x1c/0xc0 [drm]
[16869.930987] [<f9072ecc>] drm_lock_take+0x1c/0xc0 [drm]
[16869.930987] [<f907256a>] drm_locked_tasklet_func+0x3a/0x90 [drm]
[16869.930987] [<c01476eb>] tasklet_hi_action+0x5b/0xd0
[16869.930987] [<c01474e4>] __do_softirq+0x74/0xe0
[16869.930987] [<c011d665>] do_softirq+0x95/0xd0
[16869.930987] [<c0170480>] ? handle_fasteoi_irq+0x0/0xf0
[16869.930987] [<c0147386>] irq_exit+0x86/0xa0
[16869.930987] [<c011d720>] do_IRQ+0x80/0xc0
[16869.930987] [<c011af82>] common_interrupt+0x2e/0x34
[16869.930987] [<c01600d8>] ? tick_setup_oneshot+0x28/0x40
[16869.930987] [<c030fa9f>] ? acpi_idle_enter_bm+0x297/0x306
[16869.930987] [<c03cfd0b>] cpuidle_idle_call+0x6b/0xc0
[16869.930987] [<c03cfca0>] ? cpuidle_idle_call+0x0/0xc0
[16869.930987] [<c0118f70>] cpu_idle+0x60/0xf0
[16869.930987] [<c04806f2>] rest_init+0x62/0x70
[16869.930987] =======================
prev parent reply other threads:[~2008-09-11 18:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-10 16:48 2.6.26.4 hard-unsafe lock order detected (drm-related?) Marcus Furlong
2008-09-10 18:15 ` Peter Zijlstra
2008-09-11 11:36 ` Marcus Furlong
2008-09-11 18:21 ` Marcus Furlong [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='gabnj1$nh4$1@ger.gmane.org' \
--to=furlongm@hotmail.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.