linux-kernel - Re: KASAN: null-ptr-deref Write in blk_mq_map

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Message-ID: <60bb3266-03fb-acfc-d285-b0249bb5e57d@acm.org>
Date:   Thu, 26 Mar 2020 20:00:15 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     syzbot <syzbot+313d95e8a7a49263f88d@...kaller.appspotmail.com>,
        a@...table.cc, axboe@...nel.dk, b.a.t.m.a.n@...ts.open-mesh.org,
        davem@...emloft.net, dongli.zhang@...cle.com,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, mareklindner@...mailbox.ch,
        netdev@...r.kernel.org, sven@...fation.org, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: KASAN: null-ptr-deref Write in blk_mq_map_swqueue

On 2020-03-26 18:28, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 768134d4f48109b90f4248feecbeeb7d684e410c
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Mon Nov 11 03:30:53 2019 +0000
> 
>     io_uring: don't do flush cancel under inflight_lock
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14233ef5e00000
> start commit:   1b649e0b Merge git://git.kernel.org/pub/scm/linux/kernel/g..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=16233ef5e00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12233ef5e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=27392dd2975fd692
> dashboard link: https://syzkaller.appspot.com/bug?extid=313d95e8a7a49263f88d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13850447e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=119a26f5e00000
> 
> Reported-by: syzbot+313d95e8a7a49263f88d@...kaller.appspotmail.com
> Fixes: 768134d4f481 ("io_uring: don't do flush cancel under inflight_lock")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection


#syz fix: blk-mq: Fix a recently introduced regression in
blk_mq_realloc_hw_ctxs()