Re: [PATCH 1/1] fscache: Fix oops due to race with cookie_lru and use_cookie

[David Wysochanski <dwysocha@xxxxxxxxxx>]

On Thu, Nov 17, 2022 at 8:52 AM David Howells <dhowells@xxxxxxxxxx> wrote:
>
> Dave Wysochanski <dwysocha@xxxxxxxxxx> wrote:
>
> > +             clear_bit(FSCACHE_COOKIE_DO_LRU_DISCARD, &cookie->flags);
>
> Actually, can you do test_and_clear_bit() and then log a trace point, say:
>
>         fscache_see_cookie(cookie, fscache_cookie_see_lru_discard_cancel);
>
> if the bit was set.
>
> David
>

Ok sure.  I will post a v2 with the trace point and the test_and_clear_bit.