> On Apr 27, 2020, at 7:56 PM, Waiman Long wrote:
>
> A lockdep splat is observed by echoing "1" to the shrink sysfs file
> and then shutting down the system:
>
> [ 167.473392] Chain exists of:
> [ 167.473392] kn->count#279 --> mem_hotplug_lock.rw_sem --> slab_mutex
> [ 167.473392]
> [
> On Apr 28, 2020, at 10:07 AM, Waiman Long wrote:
>
> Trylock is handled differently from lockdep's perspective as trylock can
> failed. When trylock succeeds, the critical section is executed. As long as
> it doesn't try to acquire another lock in the circular chain, the execution
> will
> On Apr 28, 2020, at 10:06 AM, Waiman Long wrote:
>
> On 4/27/20 10:11 PM, Qian Cai wrote:
>>
>>> On Apr 27, 2020, at 9:39 PM, Waiman Long wrote:
>>>
>>> The sequence that was prevented by this patch is "kn->count -->
>>> mem_hotplug_lock.rwsem". This sequence isn't directly in the
On 4/27/20 10:11 PM, Qian Cai wrote:
On Apr 27, 2020, at 9:39 PM, Waiman Long wrote:
The sequence that was prevented by this patch is "kn->count -->
mem_hotplug_lock.rwsem". This sequence isn't directly in the splat. Once this link is
broken, the 3-lock circular loop cannot be formed.
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