linux-ext4 - Re: possible deadlock in flush

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Message-ID: <000000000000d8b0630596c1d4a0@google.com>
Date:   Thu, 07 Nov 2019 05:42:07 -0800
From:   syzbot <syzbot+a50c7541a4a55cd49b02@...kaller.appspotmail.com>
To:     aarcange@...hat.com, adilger.kernel@...ger.ca,
        akpm@...ux-foundation.org, aneesh.kumar@...ux.vnet.ibm.com,
        dave@...olabs.net, davem@...emloft.net, hughd@...gle.com,
        jiangshanlai@...il.com, kirill.shutemov@...ux.intel.com,
        kuznet@....inr.ac.ru, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mhocko@...nel.org, mike.kravetz@...cle.com,
        n-horiguchi@...jp.nec.com, netdev@...r.kernel.org,
        prakash.sangappa@...cle.com, sbrivio@...hat.com,
        sd@...asysnail.net, syzkaller-bugs@...glegroups.com, tj@...nel.org,
        torvalds@...ux-foundation.org, tytso@....edu,
        viro@...iv.linux.org.uk, yoshfuji@...ux-ipv6.org
Subject: Re: possible deadlock in flush_workqueue (2)

syzbot suspects this bug was fixed by commit:

commit e7c58097793ef15d58fadf190ee58738fbf447cd
Author: Mike Kravetz <mike.kravetz@...cle.com>
Date:   Tue Jan 8 23:23:32 2019 +0000

     hugetlbfs: revert "Use i_mmap_rwsem to fix page fault/truncate race"

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14ec0d2c600000
start commit:   ca9eb48f Merge tag 'regulator-v5.0' of git://git.kernel.or..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=963b24abf3f7c2d8
dashboard link: https://syzkaller.appspot.com/bug?extid=a50c7541a4a55cd49b02
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12097f03400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10b55ac5400000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: hugetlbfs: revert "Use i_mmap_rwsem to fix page fault/truncate  
race"

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