* INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316
@ 2012-03-18 15:36 Justin P. Mattock
2012-03-18 15:54 ` Tejun Heo
0 siblings, 1 reply; 6+ messages in thread
From: Justin P. Mattock @ 2012-03-18 15:36 UTC (permalink / raw)
To: linux-kernel
with the current linux-next I am seeing this in dmesg..:
[ 3.643089] isapnp: No Plug & Play device found
[ 3.643690] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
[ 3.673061]
[ 3.699307] ===============================
[ 3.725757] [ INFO: suspicious RCU usage. ]
[ 3.752134] 3.3.0-rc7-next-20120316 #1 Not tainted
[ 3.778508] -------------------------------
[ 3.778510] kernel/cgroup.c:1719 suspicious rcu_dereference_check()
usage!
[ 3.778512]
[ 3.778512] other info that might help us debug this:
[ 3.778513]
[ 3.778515]
[ 3.778515] rcu_scheduler_active = 1, debug_locks = 1
[ 3.778517] no locks held by swapper/0/1.
[ 3.778517]
[ 3.778518] stack backtrace:
[ 3.778519] Pid: 1, comm: swapper/0 Not tainted
3.3.0-rc7-next-20120316 #1
[ 3.778521] Call Trace:
[ 3.778528] [<c158cc21>] ? printk+0x1d/0x1f
[ 3.778534] [<c10a822a>] lockdep_rcu_suspicious+0xca/0x100
[ 3.778536] [<c10bedea>] cgroup_path+0x17a/0x1c0
[ 3.778540] [<c12d4e92>] ? __raw_spin_lock_init+0x32/0x60
[ 3.778545] [<c12b9eba>] blkg_lookup_create+0x1aa/0x430
[ 3.778548] [<c1596ec5>] ? _raw_spin_lock_irq+0x55/0x60
[ 3.778550] [<c12bc32b>] blk_throtl_init+0x11b/0x210
[ 3.778552] [<c12bc24a>] ? blk_throtl_init+0x3a/0x210
[ 3.778554] [<c12ba600>] blkcg_init_queue+0x30/0x80
[ 3.778558] [<c129fc77>] blk_alloc_queue_node+0x1e7/0x220
[ 3.778560] [<c129fcc2>] blk_alloc_queue+0x12/0x20
[ 3.778563] [<c13a4139>] brd_alloc+0x69/0x180
[ 3.778566] [<c1398ab5>] ? device_pm_init+0x65/0x90
[ 3.778569] [<c186f0e7>] brd_init+0xb0/0x185
[ 3.778574] [<c138fe07>] ? device_register+0x17/0x20
[ 3.778577] [<c1003034>] do_one_initcall+0x34/0x170
[ 3.778578] [<c186f037>] ? regmap_initcall+0xc/0xc
[ 3.778582] [<c183e8d9>] kernel_init+0x103/0x198
[ 3.778584] [<c183e19a>] ? rdinit_setup+0x22/0x22
[ 3.778586] [<c183e7d6>] ? start_kernel+0x38b/0x38b
[ 3.778589] [<c159ef02>] kernel_thread_helper+0x6/0x10
[ 3.778592] [<c136d379>] ? tty_change_softcar+0x29/0xe0
[ 3.780902] brd: module loaded
[ 3.782352] loop: module loaded
[ 3.782641] ahci 0000:00:1f.2: version 3.
dmesg here:
http://fpaste.org/CpBD/
from what I remember I was doing a git pull and ran out of memory then
ran git pull again and everything seemed alright, so I proceeded with
building and running this kernel on reboot this showed up.
Justin P. Mattock
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316
2012-03-18 15:36 INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316 Justin P. Mattock
@ 2012-03-18 15:54 ` Tejun Heo
2012-03-18 17:42 ` Justin P. Mattock
0 siblings, 1 reply; 6+ messages in thread
From: Tejun Heo @ 2012-03-18 15:54 UTC (permalink / raw)
To: Justin P. Mattock; +Cc: linux-kernel, Jens Axboe, Vivek Goyal
On Sun, Mar 18, 2012 at 08:36:26AM -0700, Justin P. Mattock wrote:
> with the current linux-next I am seeing this in dmesg..:
>
> [ 3.643089] isapnp: No Plug & Play device found
> [ 3.643690] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
> [ 3.673061]
> [ 3.699307] ===============================
> [ 3.725757] [ INFO: suspicious RCU usage. ]
> [ 3.752134] 3.3.0-rc7-next-20120316 #1 Not tainted
> [ 3.778508] -------------------------------
> [ 3.778510] kernel/cgroup.c:1719 suspicious
> rcu_dereference_check() usage!
> [ 3.778512]
> [ 3.778512] other info that might help us debug this:
> [ 3.778513]
> [ 3.778515]
> [ 3.778515] rcu_scheduler_active = 1, debug_locks = 1
> [ 3.778517] no locks held by swapper/0/1.
> [ 3.778517]
> [ 3.778518] stack backtrace:
> [ 3.778519] Pid: 1, comm: swapper/0 Not tainted
> 3.3.0-rc7-next-20120316 #1
> [ 3.778521] Call Trace:
> [ 3.778528] [<c158cc21>] ? printk+0x1d/0x1f
> [ 3.778534] [<c10a822a>] lockdep_rcu_suspicious+0xca/0x100
> [ 3.778536] [<c10bedea>] cgroup_path+0x17a/0x1c0
Known problem. The following pending patchset should fix the problem.
http://thread.gmane.org/gmane.linux.kernel/1263989
Jens?
Thakns.
--
tejun
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316
2012-03-18 15:54 ` Tejun Heo
@ 2012-03-18 17:42 ` Justin P. Mattock
2012-03-19 17:01 ` Tejun Heo
0 siblings, 1 reply; 6+ messages in thread
From: Justin P. Mattock @ 2012-03-18 17:42 UTC (permalink / raw)
To: Tejun Heo; +Cc: linux-kernel, Jens Axboe, Vivek Goyal
On 03/18/2012 08:54 AM, Tejun Heo wrote:
> On Sun, Mar 18, 2012 at 08:36:26AM -0700, Justin P. Mattock wrote:
>> with the current linux-next I am seeing this in dmesg..:
>>
>> [ 3.643089] isapnp: No Plug& Play device found
>> [ 3.643690] Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled
>> [ 3.673061]
>> [ 3.699307] ===============================
>> [ 3.725757] [ INFO: suspicious RCU usage. ]
>> [ 3.752134] 3.3.0-rc7-next-20120316 #1 Not tainted
>> [ 3.778508] -------------------------------
>> [ 3.778510] kernel/cgroup.c:1719 suspicious
>> rcu_dereference_check() usage!
>> [ 3.778512]
>> [ 3.778512] other info that might help us debug this:
>> [ 3.778513]
>> [ 3.778515]
>> [ 3.778515] rcu_scheduler_active = 1, debug_locks = 1
>> [ 3.778517] no locks held by swapper/0/1.
>> [ 3.778517]
>> [ 3.778518] stack backtrace:
>> [ 3.778519] Pid: 1, comm: swapper/0 Not tainted
>> 3.3.0-rc7-next-20120316 #1
>> [ 3.778521] Call Trace:
>> [ 3.778528] [<c158cc21>] ? printk+0x1d/0x1f
>> [ 3.778534] [<c10a822a>] lockdep_rcu_suspicious+0xca/0x100
>> [ 3.778536] [<c10bedea>] cgroup_path+0x17a/0x1c0
>
> Known problem. The following pending patchset should fix the problem.
>
> http://thread.gmane.org/gmane.linux.kernel/1263989
>
> Jens?
>
> Thakns.
>
cool thanks for the info..
I went and applied your patches(all 5) and there is fuzz, and some
errors with linux-next.
seems the suspicious message is still there, but the system boots up
just fine with the patches in.
maybe manually applying them by hand is what I need to do for -next so
I dont miss anything important with the patch that takes care of the
suspicious message.
Justin P. Mattock
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316
2012-03-18 17:42 ` Justin P. Mattock
@ 2012-03-19 17:01 ` Tejun Heo
2012-03-20 6:04 ` Justin P. Mattock
[not found] ` <CAKFRV=N5cF7MTuSpOjySmGgJNnW2b1tBZeF5W4XckA7dMSXysg@mail.gmail.com>
0 siblings, 2 replies; 6+ messages in thread
From: Tejun Heo @ 2012-03-19 17:01 UTC (permalink / raw)
To: Justin P. Mattock; +Cc: linux-kernel, Jens Axboe, Vivek Goyal
On Sun, Mar 18, 2012 at 10:42:33AM -0700, Justin P. Mattock wrote:
> >Known problem. The following pending patchset should fix the problem.
> >
> > http://thread.gmane.org/gmane.linux.kernel/1263989
> >
> >Jens?
> >
> >Thakns.
> >
>
> cool thanks for the info..
> I went and applied your patches(all 5) and there is fuzz, and some
> errors with linux-next.
> seems the suspicious message is still there, but the system boots up
> just fine with the patches in.
> maybe manually applying them by hand is what I need to do for -next
> so I dont miss anything important with the patch that takes care of
> the suspicious message.
Hmm... weird. I just double check and the patch series makes the
warning go away. Can you please try the following git branch instead?
git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git blkcg-stats
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316
2012-03-19 17:01 ` Tejun Heo
@ 2012-03-20 6:04 ` Justin P. Mattock
[not found] ` <CAKFRV=N5cF7MTuSpOjySmGgJNnW2b1tBZeF5W4XckA7dMSXysg@mail.gmail.com>
1 sibling, 0 replies; 6+ messages in thread
From: Justin P. Mattock @ 2012-03-20 6:04 UTC (permalink / raw)
To: Tejun Heo; +Cc: linux-kernel, Jens Axboe, Vivek Goyal
On 03/19/2012 10:01 AM, Tejun Heo wrote:
> On Sun, Mar 18, 2012 at 10:42:33AM -0700, Justin P. Mattock wrote:
>>> Known problem. The following pending patchset should fix the problem.
>>>
>>> http://thread.gmane.org/gmane.linux.kernel/1263989
>>>
>>> Jens?
>>>
>>> Thakns.
>>>
>>
>> cool thanks for the info..
>> I went and applied your patches(all 5) and there is fuzz, and some
>> errors with linux-next.
>> seems the suspicious message is still there, but the system boots up
>> just fine with the patches in.
>> maybe manually applying them by hand is what I need to do for -next
>> so I dont miss anything important with the patch that takes care of
>> the suspicious message.
>
> Hmm... weird. I just double check and the patch series makes the
> warning go away. Can you please try the following git branch instead?
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git blkcg-stats
>
> Thanks.
>
alright! I built and ran misc.git. I am not seeing this warning, if its
safe to say this fixes the warning then its cool, but if not then I can
try this patch on linux-next just to see.. other than that Thanks for
the info/help!
Justin P. Mattock
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316
[not found] ` <CAKFRV=N5cF7MTuSpOjySmGgJNnW2b1tBZeF5W4XckA7dMSXysg@mail.gmail.com>
@ 2012-03-23 4:23 ` Justin P. Mattock
0 siblings, 0 replies; 6+ messages in thread
From: Justin P. Mattock @ 2012-03-23 4:23 UTC (permalink / raw)
To: Tejun Heo; +Cc: Jens Axboe, Vivek Goyal, linux-kernel
On 03/19/2012 11:17 AM, Justin Mattock wrote:
> Alright!! Will pull that branch as soon as i get to a stable connection
> later today.. as for the patch i probably missed something with the fuzz
> it was generating
>
> Justin P. Mattock
>
> On Mar 19, 2012 10:01 AM, "Tejun Heo" <tj@kernel.org
> <mailto:tj@kernel.org>> wrote:
>
> On Sun, Mar 18, 2012 at 10:42:33AM -0700, Justin P. Mattock wrote:
> > >Known problem. The following pending patchset should fix the
> problem.
> > >
> > > http://thread.gmane.org/gmane.linux.kernel/1263989
> > >
> > >Jens?
> > >
> > >Thakns.
> > >
> >
> > cool thanks for the info..
> > I went and applied your patches(all 5) and there is fuzz, and some
> > errors with linux-next.
> > seems the suspicious message is still there, but the system boots up
> > just fine with the patches in.
> > maybe manually applying them by hand is what I need to do for -next
> > so I dont miss anything important with the patch that takes care of
> > the suspicious message.
>
> Hmm... weird. I just double check and the patch series makes the
> warning go away. Can you please try the following git branch instead?
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git
> <http://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git> blkcg-stats
>
> Thanks.
>
> --
> tejun
alright! looks like on the main linux-next this warning is
fixed(assuming your patches have been pushed in).
uname -r 3.3.0-next-20120322-00001-gba6003c
Thanks for the info and help with this!
Justin P. Mattock
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-03-23 4:23 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-03-18 15:36 INFO: suspicious RCU usage. on 3.3.0-rc7-next-20120316 Justin P. Mattock
2012-03-18 15:54 ` Tejun Heo
2012-03-18 17:42 ` Justin P. Mattock
2012-03-19 17:01 ` Tejun Heo
2012-03-20 6:04 ` Justin P. Mattock
[not found] ` <CAKFRV=N5cF7MTuSpOjySmGgJNnW2b1tBZeF5W4XckA7dMSXysg@mail.gmail.com>
2012-03-23 4:23 ` Justin P. Mattock
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