linux-kernel - Re: [syzbot] [kernel?] possible deadlock in console_flush

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Message-ID: <20231017141326.GB1599@noisy.programming.kicks-ass.net>
Date:   Tue, 17 Oct 2023 16:13:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Aleksandr Nogikh <nogikh@...gle.com>
Cc:     syzbot <syzbot+f78380e4eae53c64125c@...kaller.appspotmail.com>,
        Benjamin Segall <bsegall@...gle.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [syzbot] [kernel?] possible deadlock in console_flush_all (2)

On Tue, Oct 17, 2023 at 12:06:12PM +0200, Aleksandr Nogikh wrote:
> This is currently causing more than 50% daily crashes on syzbot:
> 
> https://syzkaller.appspot.com/upstream/graph/crashes
> 
> It began to appear after next-20231004. Judging by the diff between
> next-20231003 and next-20231004, it looks like quite a few changes to
> kernel/sched were merged in between. Could it be caused by any of
> those?

> > EEVDF scheduling fail, picking leftmost

That was in next for a little bit, can you still reproduce with current
next?