linux-kernel - Re: regression: LTP isofs testcase failure - bisection fingers "loop: make autoclear operation asynchronous"

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Date:   Wed, 19 Jan 2022 21:48:27 +0100
From:   Mike Galbraith <efault@....de>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     lkml <linux-kernel@...r.kernel.org>
Subject: Re: regression: LTP isofs testcase failure - bisection fingers
 "loop: make autoclear operation asynchronous"

On Tue, 2022-01-18 at 15:19 +0900, Tetsuo Handa wrote:
> On 2022/01/18 12:21, Mike Galbraith wrote:
> > On Tue, 2022-01-18 at 06:57 +0900, Tetsuo Handa wrote:
> > > On 2022/01/18 0:34, Mike Galbraith wrote:
> > > > Greetings,
> > > >
> > > > LTP's isofs testcase began failing this cycle, and bisected as below,
> > > > which a revert then confirmed.  Full testcase output attached.
> > > >
> > >
> > > Thanks for reporting.
> > > Discussion is continued at https://lkml.kernel.org/r/cdaf1346-2885-f0da-8878-12264bd48348@I-love.SAKURA.ne.jp .
> >
> > FWIW, simply immediately flushing that shiny new rundown_work turned
> > LTP's thumb back to upward pointing.
>
> Unfortunately, that reintroduces the circular locking dependency problem
> which my patch tried to solve.

Hm, lockdep was green (and is, just double checked out of curiosity)
with the LTP testcase (shrug).

Happily, and as previously noted, both patch options at the link you
provided restored the LTP testcase's happy camper status.

	-Mike