Re: [PATCH v8 13/19] locking/rwsem: Make rwsem->owner an atomic_long_t

[Waiman Long]

This is a multi-part message in MIME format.On 7/20/19 4:41 AM, Luis Henriques wrote:
> "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:
>
>> On Fri, Jul 19, 2019 at 12:32 PM Waiman Long <longman@xxxxxxxxxx> wrote:
>>> This patch shouldn't change the behavior of the rwsem code. The code
>>> only access data within the rw_semaphore structures. I don't know why it
>>> will cause a KASAN error. I will have to reproduce it and figure out
>>> exactly which statement is doing the invalid access.
>> The stack traces should show line numbers if you run them through
>> scripts/decode_stacktrace.sh.
>>
>> You need to have debug info enabled for that, though.
>>
>> Luis?
>>
>>              Linus
> Yep, sure.  And I should have done this in the initial report.  It's a
> different trace, I had to recompile the kernel.
>
> (I'm also adding Jeff to the CC list.)
>
> Cheers,

Thanks for the information. I think I know where the problem is. Would
you mind applying the attached patch to see if it can fix the KASAN error.

Thanks,
Longman