Re: uring regression - lost write request

[Salvatore Bonaccorso <carnil@debian.org>]

Hi Daniel,

On Mon, Oct 25, 2021 at 12:25:01PM +0100, Pavel Begunkov wrote:
> On 10/25/21 12:09, Daniel Black wrote:
> > On Mon, Oct 25, 2021 at 8:59 PM Pavel Begunkov <asml.silence@gmail.com> wrote:
> > > 
> > > On 10/22/21 10:10, Pavel Begunkov wrote:
> > > > On 10/22/21 04:12, Daniel Black wrote:
> > > > > Sometime after 5.11 and is fixed in 5.15-rcX (rc6 extensively tested
> > > > > over last few days) is a kernel regression we are tracing in
> > > > > https://jira.mariadb.org/browse/MDEV-26674 and
> > > > > https://jira.mariadb.org/browse/MDEV-26555
> > > > > 5.10 and early across many distros and hardware appear not to have a problem.
> > > > > 
> > > > > I'd appreciate some help identifying a 5.14 linux stable patch
> > > > > suitable as I observe the fault in mainline 5.14.14 (built
> > > > 
> > > > Cc: io-uring@vger.kernel.org
> > > > 
> > > > Let me try to remember anything relevant from 5.15,
> > > > Thanks for letting know
> > > 
> > > Daniel, following the links I found this:
> > > 
> > > "From: Daniel Black <daniel@mariadb.org>
> > > ...
> > > The good news is I've validated that the linux mainline 5.14.14 build
> > > from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.14.14/ has
> > > actually fixed this problem."
> > > 
> > > To be clear, is the mainline 5.14 kernel affected with the issue?
> > > Or does the problem exists only in debian/etc. kernel trees?
> > 
> > Thanks Pavel for looking.
> > 
> > I'm retesting https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.14.14/
> > in earnest. I did get some assertions, but they may have been
> > unrelated. The testing continues...
> 
> Thanks for the work on pinpointing it. I'll wait for your conclusion
> then, it'll give us an idea what we should look for.

Were you able to pinpoint the issue?

Regards,
Salvatore