On 03/26/2014 01:01 PM, Jeff Mahoney wrote:
> On 3/17/14, 9:05 AM, David Sterba wrote:
>>> On Fri, Mar 14, 2014 at 08:12:16PM -0400, Sasha Levin wrote:
>>>>> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following:
>>>>>
>>>>> [ 788.458756] CPU0 CPU1 [ 788.459188] ---- ---- [ 788.459625] lock(&found->groups_sem); [ 788.460041] local_irq_disable(); [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] lock(&found->groups_sem); [ 788.460041] <Interrupt> [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] [ 788.460041] *** DEADLOCK *** [ 788.460041] [ 788.460041] 2 locks held by kswapd3/4199:
>>>
>>> I've once (3.14-rc5) seen the same warning also caused by xfstests/generic/224
> I think this is from my sysfs patches. We call kobject_add while holding the group_sem. kobject_add ultimately allocates with GFP_KERNEL, so it can enter reclaim. This particular case isn't dangerous, but it could hit while hot-adding a device. The fix should be pretty simple.
Is that fix available anywhere? I'm still seeing the issue in -next.
Thanks,
Sasha
On Fri, Apr 04, 2014 at 05:15:23PM -0400, Sasha Levin wrote:
> On 03/26/2014 01:01 PM, Jeff Mahoney wrote:
> > On 3/17/14, 9:05 AM, David Sterba wrote:
> >>> On Fri, Mar 14, 2014 at 08:12:16PM -0400, Sasha Levin wrote:
> >>>>> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following:
> >>>>>
> >>>>> [ 788.458756] CPU0 CPU1 [ 788.459188] ---- ---- [ 788.459625] lock(&found->groups_sem); [ 788.460041] local_irq_disable(); [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] lock(&found->groups_sem); [ 788.460041] <Interrupt> [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] [ 788.460041] *** DEADLOCK *** [ 788.460041] [ 788.460041] 2 locks held by kswapd3/4199:
> >>>
> >>> I've once (3.14-rc5) seen the same warning also caused by xfstests/generic/224
> > I think this is from my sysfs patches. We call kobject_add while holding the group_sem. kobject_add ultimately allocates with GFP_KERNEL, so it can enter reclaim. This particular case isn't dangerous, but it could hit while hot-adding a device. The fix should be pretty simple.
>
> Is that fix available anywhere? I'm still seeing the issue in -next.
It is: https://patchwork.kernel.org/patch/3894781/ , will probably hit -rc2
On 04/07/2014 12:54 PM, David Sterba wrote:
> On Fri, Apr 04, 2014 at 05:15:23PM -0400, Sasha Levin wrote:
>> On 03/26/2014 01:01 PM, Jeff Mahoney wrote:
>>> On 3/17/14, 9:05 AM, David Sterba wrote:
>>>>> On Fri, Mar 14, 2014 at 08:12:16PM -0400, Sasha Levin wrote:
>>>>>>> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following:
>>>>>>>
>>>>>>> [ 788.458756] CPU0 CPU1 [ 788.459188] ---- ---- [ 788.459625] lock(&found->groups_sem); [ 788.460041] local_irq_disable(); [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] lock(&found->groups_sem); [ 788.460041] <Interrupt> [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] [ 788.460041] *** DEADLOCK *** [ 788.460041] [ 788.460041] 2 locks held by kswapd3/4199:
>>>>>
>>>>> I've once (3.14-rc5) seen the same warning also caused by xfstests/generic/224
>>> I think this is from my sysfs patches. We call kobject_add while holding the group_sem. kobject_add ultimately allocates with GFP_KERNEL, so it can enter reclaim. This particular case isn't dangerous, but it could hit while hot-adding a device. The fix should be pretty simple.
>>
>> Is that fix available anywhere? I'm still seeing the issue in -next.
>
> It is: https://urldefense.proofpoint.com/v1/url?u=https://patchwork.kernel.org/patch/3894781/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=6%2FL0lzzDhu0Y1hL9xm%2BQyA%3D%3D%0A&m=HQJVSK4wPTft1zWwI1cGvwj5OfdmN5UItVlucU1K31o%3D%0A&s=5113699a2e7345a779333c87dd5b1d88b4410a7c7fcd5fa424baeb838ad7d31b , will probably hit -rc2
>
Its in the integration branch now along with some other important fixes.
We'll get it out shortly
-chris
On 04/07/2014 01:17 PM, Chris Mason wrote:
>
>
> On 04/07/2014 12:54 PM, David Sterba wrote:
>> On Fri, Apr 04, 2014 at 05:15:23PM -0400, Sasha Levin wrote:
>>> On 03/26/2014 01:01 PM, Jeff Mahoney wrote:
>>>> On 3/17/14, 9:05 AM, David Sterba wrote:
>>>>>> On Fri, Mar 14, 2014 at 08:12:16PM -0400, Sasha Levin wrote:
>>>>>>>> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following:
>>>>>>>>
>>>>>>>> [ 788.458756] CPU0 CPU1 [ 788.459188] ---- ---- [ 788.459625] lock(&found->groups_sem); [ 788.460041] local_irq_disable(); [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] lock(&found->groups_sem); [ 788.460041] <Interrupt> [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] [ 788.460041] *** DEADLOCK *** [ 788.460041] [ 788.460041] 2 locks held by kswapd3/4199:
>>>>>>
>>>>>> I've once (3.14-rc5) seen the same warning also caused by xfstests/generic/224
>>>> I think this is from my sysfs patches. We call kobject_add while holding the group_sem. kobject_add ultimately allocates with GFP_KERNEL, so it can enter reclaim. This particular case isn't dangerous, but it could hit while hot-adding a device. The fix should be pretty simple.
>>>
>>> Is that fix available anywhere? I'm still seeing the issue in -next.
>>
>> It is: https://urldefense.proofpoint.com/v1/url?u=https://patchwork.kernel.org/patch/3894781/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=6%2FL0lzzDhu0Y1hL9xm%2BQyA%3D%3D%0A&m=HQJVSK4wPTft1zWwI1cGvwj5OfdmN5UItVlucU1K31o%3D%0A&s=5113699a2e7345a779333c87dd5b1d88b4410a7c7fcd5fa424baeb838ad7d31b , will probably hit -rc2
>>
>
> Its in the integration branch now along with some other important fixes. We'll get it out shortly
Chris,
Can I suggest adding the integration branch to linux-next as well? That way
all the folks who report issues coming out of -next would be able to test
the fixes as well.
Thanks,
Sasha
I was on vacation last week, I'll update btrfs-next today once we are happy with integration. Thanks,
Josef
Sasha Levin <[email protected]> wrote:
On 04/07/2014 01:17 PM, Chris Mason wrote:
>
>
> On 04/07/2014 12:54 PM, David Sterba wrote:
>> On Fri, Apr 04, 2014 at 05:15:23PM -0400, Sasha Levin wrote:
>>> On 03/26/2014 01:01 PM, Jeff Mahoney wrote:
>>>> On 3/17/14, 9:05 AM, David Sterba wrote:
>>>>>> On Fri, Mar 14, 2014 at 08:12:16PM -0400, Sasha Levin wrote:
>>>>>>>> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following:
>>>>>>>>
>>>>>>>> [ 788.458756] CPU0 CPU1 [ 788.459188] ---- ---- [ 788.459625] lock(&found->groups_sem); [ 788.460041] local_irq_disable(); [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] lock(&found->groups_sem); [ 788.460041] <Interrupt> [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] [ 788.460041] *** DEADLOCK *** [ 788.460041] [ 788.460041] 2 locks held by kswapd3/4199:
>>>>>>
>>>>>> I've once (3.14-rc5) seen the same warning also caused by xfstests/generic/224
>>>> I think this is from my sysfs patches. We call kobject_add while holding the group_sem. kobject_add ultimately allocates with GFP_KERNEL, so it can enter reclaim. This particular case isn't dangerous, but it could hit while hot-adding a device. The fix should be pretty simple.
>>>
>>> Is that fix available anywhere? I'm still seeing the issue in -next.
>>
>> It is: https://urldefense.proofpoint.com/v1/url?u=https://patchwork.kernel.org/patch/3894781/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=6%2FL0lzzDhu0Y1hL9xm%2BQyA%3D%3D%0A&m=HQJVSK4wPTft1zWwI1cGvwj5OfdmN5UItVlucU1K31o%3D%0A&s=5113699a2e7345a779333c87dd5b1d88b4410a7c7fcd5fa424baeb838ad7d31b , will probably hit -rc2
>>
>
> Its in the integration branch now along with some other important fixes. We'll get it out shortly
Chris,
Can I suggest adding the integration branch to linux-next as well? That way
all the folks who report issues coming out of -next would be able to test
the fixes as well.
Thanks,
Sasha
On 04/07/2014 02:03 PM, Sasha Levin wrote:
> On 04/07/2014 01:17 PM, Chris Mason wrote:
>>
>>
>> On 04/07/2014 12:54 PM, David Sterba wrote:
>>> On Fri, Apr 04, 2014 at 05:15:23PM -0400, Sasha Levin wrote:
>>>> On 03/26/2014 01:01 PM, Jeff Mahoney wrote:
>>>>> On 3/17/14, 9:05 AM, David Sterba wrote:
>>>>>>> On Fri, Mar 14, 2014 at 08:12:16PM -0400, Sasha Levin wrote:
>>>>>>>>> While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following:
>>>>>>>>>
>>>>>>>>> [ 788.458756] CPU0 CPU1 [ 788.459188] ---- ---- [ 788.459625] lock(&found->groups_sem); [ 788.460041] local_irq_disable(); [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] lock(&found->groups_sem); [ 788.460041] <Interrupt> [ 788.460041] lock(&delayed_node->mutex); [ 788.460041] [ 788.460041] *** DEADLOCK *** [ 788.460041] [ 788.460041] 2 locks held by kswapd3/4199:
>>>>>>>
>>>>>>> I've once (3.14-rc5) seen the same warning also caused by xfstests/generic/224
>>>>> I think this is from my sysfs patches. We call kobject_add while holding the group_sem. kobject_add ultimately allocates with GFP_KERNEL, so it can enter reclaim. This particular case isn't dangerous, but it could hit while hot-adding a device. The fix should be pretty simple.
>>>>
>>>> Is that fix available anywhere? I'm still seeing the issue in -next.
>>>
>>> It is: https://urldefense.proofpoint.com/v1/url?u=https://patchwork.kernel.org/patch/3894781/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=6%2FL0lzzDhu0Y1hL9xm%2BQyA%3D%3D%0A&m=HQJVSK4wPTft1zWwI1cGvwj5OfdmN5UItVlucU1K31o%3D%0A&s=5113699a2e7345a779333c87dd5b1d88b4410a7c7fcd5fa424baeb838ad7d31b , will probably hit -rc2
>>>
>>
>> Its in the integration branch now along with some other important fixes. We'll get it out shortly
>
> Chris,
>
> Can I suggest adding the integration branch to linux-next as well? That way
> all the folks who report issues coming out of -next would be able to test
> the fixes as well.
>
Hi Sasha,
The ink is still a little wet on the integration branch. It'll
definitely go to linux-next and to Linus.
-chris