Re: slub: BUG: Invalid wait context

[Jens Axboe]

On 9/2/21 1:02 PM, Matthew Wilcox wrote:
> On Thu, Sep 02, 2021 at 12:59:33PM -0600, Jens Axboe wrote:
>> On 9/2/21 12:56 PM, Matthew Wilcox wrote:
>>> On Thu, Sep 02, 2021 at 10:22:23AM -0600, Jens Axboe wrote:
>>>> Hi,
>>>>
>>>> Booting current -git yields the below splat. I'm assuming this is
>>>> related to the new RT stuff, where spin_lock() can sleep. This obviously
>>>> won't fly off IPI.
>>>
>>> You want to turn off PROVE_RAW_LOCK_NESTING for the moment.
>>
>> Because?
> 
>         help
>          Enable the raw_spinlock vs. spinlock nesting checks which ensure
>          that the lock nesting rules for PREEMPT_RT enabled kernels are
>          not violated.
> 
>          NOTE: There are known nesting problems. So if you enable this
>          option expect lockdep splats until these problems have been fully
>          addressed which is work in progress. This config switch allows to
>          identify and analyze these problems. It will be removed and the
>          check permanently enabled once the main issues have been fixed.
> 
>          If unsure, select N.

This isn't a new text, it's been like that for quite a while. The warning
is new on -git with that option.

-- 
Jens Axboe