linux-kernel - Re: possible deadlock in io_submit

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Date:   Tue, 07 Apr 2020 02:31:02 -0700
From:   syzbot <syzbot+343f75cdeea091340956@...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 io_submit_one (3)

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=12b3c9c7e00000
start commit:   7e634208 Merge tag 'acpi-5.7-rc1-2' of git://git.kernel.or..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=11b3c9c7e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=16b3c9c7e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=12205d036cec317f
dashboard link: https://syzkaller.appspot.com/bug?extid=343f75cdeea091340956
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=105d592be00000

Reported-by: syzbot+343f75cdeea091340956@...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