linux-kernel - Re: possible deadlock in free_ioctx

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Date:   Thu, 02 Apr 2020 23:35:04 -0700
From:   syzbot <syzbot+832aabf700bc3ec920b9@...kaller.appspotmail.com>
To:     adobriyan@...il.com, akpm@...ux-foundation.org,
        allison@...utok.net, areber@...hat.com, aubrey.li@...ux.intel.com,
        avagin@...il.com, bcrl@...ck.org, christian@...uner.io,
        cyphar@...har.com, ebiederm@...ssion.com,
        gregkh@...uxfoundation.org, guro@...com, joel@...lfernandes.org,
        keescook@...omium.org, linmiaohe@...wei.com, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mhocko@...e.com, mingo@...nel.org, oleg@...hat.com,
        peterz@...radead.org, sargun@...gun.me,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        viro@...iv.linux.org.uk
Subject: Re: possible deadlock in free_ioctx_users (2)

syzbot has bisected this bug to:

commit 7bc3e6e55acf065500a24621f3b313e7e5998acf
Author: Eric W. Biederman <ebiederm@...ssion.com>
Date:   Thu Feb 20 00:22:26 2020 +0000

    proc: Use a list of inodes to flush from proc

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=164ae51fe00000
start commit:   7be97138 Merge tag 'xfs-5.7-merge-8' of git://git.kernel.o..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=154ae51fe00000
console output: https://syzkaller.appspot.com/x/log.txt?x=114ae51fe00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ec722f9d4eb221d2
dashboard link: https://syzkaller.appspot.com/bug?extid=832aabf700bc3ec920b9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10f37663e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16feb91fe00000

Reported-by: syzbot+832aabf700bc3ec920b9@...kaller.appspotmail.com
Fixes: 7bc3e6e55acf ("proc: Use a list of inodes to flush from proc")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection