linux-kernel - Re: [syzbot] [mm?] possible deadlock in upgrade_mmap_lock

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Message-ID: <66fcd082.050a0220.f28ec.04f1.GAE@google.com>
Date: Tue, 01 Oct 2024 21:48:02 -0700
From: syzbot <syzbot+a6456f6334aa19425886@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, ebpqwerty472123@...il.com, hughd@...gle.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, paul@...l-moore.com, 
	stephen.smalley.work@...il.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] possible deadlock in upgrade_mmap_lock_carefully

syzbot has bisected this issue to:

commit ea7e2d5e49c05e5db1922387b09ca74aa40f46e2
Author: Shu Han <ebpqwerty472123@...il.com>
Date:   Tue Sep 17 09:41:04 2024 +0000

    mm: call the security_mmap_file() LSM hook in remap_file_pages()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1530539f980000
start commit:   e32cde8d2bd7 Merge tag 'sched_ext-for-6.12-rc1-fixes-1' of..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1730539f980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1330539f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=286b31f2cf1c36b5
dashboard link: https://syzkaller.appspot.com/bug?extid=a6456f6334aa19425886
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=154e8927980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1244bdd0580000

Reported-by: syzbot+a6456f6334aa19425886@...kaller.appspotmail.com
Fixes: ea7e2d5e49c0 ("mm: call the security_mmap_file() LSM hook in remap_file_pages()")

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