linux-kernel - Re: INFO: task hung in sync

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Message-ID: <20180208144918.GF10945@tassilo.jf.intel.com>
Date:   Thu, 8 Feb 2018 06:49:18 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jan Kara <jack@...e.cz>
Cc:     syzbot <syzbot+283c3c447181741aea28@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, aryabinin@...tuozzo.com,
        jlayton@...hat.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mgorman@...hsingularity.net, mingo@...nel.org,
        rgoldwyn@...e.com, syzkaller-bugs@...glegroups.com,
        linux-fsdevel@...r.kernel.org
Subject: Re: INFO: task hung in sync_blockdev

> > It seems multiple processes deadlocked on the bd_mutex. 
> > Unfortunately there's no backtrace for the lock acquisitions,
> > so it's hard to see the exact sequence.
> 
> Well, all in the report points to a situation where some IO was submitted
> to the block device and never completed (more exactly it took longer than
> those 120s to complete that IO). It would need more digging into the

Are you sure? I didn't think outstanding IO would take bd_mutex.

-Andi