Re: [PATCH v3] ata: libata: Clear DID_TIME_OUT for ATA PT commands with sense data

[Niklas Cassel <cassel@kernel.org>]

On Tue, Oct 22, 2024 at 05:55:17PM +0800, Lai, Yi wrote:
> On Tue, Oct 22, 2024 at 10:48:04AM +0200, Niklas Cassel wrote:
> > On Tue, Oct 22, 2024 at 01:44:08PM +0800, Lai, Yi wrote:
> > > On Mon, Oct 21, 2024 at 05:20:12PM +0200, Niklas Cassel wrote:
> > > > On Mon, Oct 21, 2024 at 02:07:21PM +0200, Niklas Cassel wrote:
> > > > > Hello Yi Lai,
> > > > > 
> > > > > On Mon, Oct 21, 2024 at 06:58:59PM +0800, Lai, Yi wrote:
> > > > > > Hi Niklas Cassel,
> > > > > > 
> > > > > > Greetings!
> > > > > > 
> > > > > > I used Syzkaller and found that there is INFO: task hung in blk_mq_get_tag in v6.12-rc3
> > > > > > 
> > > > > > After bisection and the first bad commit is:
> > > > > > "
> > > > > > e5dd410acb34 ata: libata: Clear DID_TIME_OUT for ATA PT commands with sense data
> > > > > > "
> > > > > 
> > > > > It might be that your bisection results are accurate.
> > > > > 
> > > > > However, after looking at the stacktraces, I find it way more likely that
> > > > > bisection has landed on the wrong commit.
> > > > > 
> > > > > See this series that was just queued (for 6.13) a few days ago that solves a
> > > > > similar starvation:
> > > > > https://lore.kernel.org/linux-block/20241014092934.53630-1-songmuchun@bytedance.com/
> > > > > https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/log/?h=for-6.13/block
> > > > > 
> > > > > You could perhaps run with v6.14-rc4 (which should be able to trigger the bug)
> > > > > and then try v6.14-rc4 + that series applied, to see if you can still trigger
> > > > > the bug?
> > > >
> 
> I tried kernel linux-block
> https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
> branch for-6.13/block commit c97f91b1807a7966077b69b24f28c2dbcde664e9.
> 
> Issue can still be reproduced.

Thanks again for your testing!

I will try to reproduce using your reproducer (repo.c),
and see if I can make any sense of this.


Kind regards,
Niklas