linux-kernel - Re: [syzbot] BUG: MAX_LOCKDEP

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Message-ID: <000000000000981d5005d2e60598@google.com>
Date:   Sat, 11 Dec 2021 14:04:21 -0800
From:   syzbot <syzbot+8a249628ae32ea7de3a2@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, andrii@...nel.org, andy@...yhouse.net,
        ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, glider@...gle.com, hawk@...nel.org,
        j.vosburgh@...il.com, john.fastabend@...il.com,
        john.ogness@...utronix.de, kafai@...com, kpsingh@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, pmladek@...e.com, rdunlap@...radead.org,
        songliubraving@...com, swboyd@...omium.org,
        syzkaller-bugs@...glegroups.com, vfalico@...il.com, yhs@...com
Subject: Re: [syzbot] BUG: MAX_LOCKDEP_CHAINS too low! (3)

syzbot has found a reproducer for the following issue on:

HEAD commit:    6f513529296f Merge tag 'for-5.16-rc4-tag' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10a8954db00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=221ffc09e39ebbd1
dashboard link: https://syzkaller.appspot.com/bug?extid=8a249628ae32ea7de3a2
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12777551b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15a99a05b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8a249628ae32ea7de3a2@...kaller.appspotmail.com

BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 6709 Comm: kworker/u4:7 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bond1948 bond_netdev_notify_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 add_chain_cache kernel/locking/lockdep.c:3649 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3748 [inline]
 validate_chain kernel/locking/lockdep.c:3769 [inline]
 __lock_acquire.cold+0x372/0x3ab kernel/locking/lockdep.c:5027
 lock_acquire kernel/locking/lockdep.c:5637 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
 process_one_work+0x921/0x1690 kernel/workqueue.c:2274
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>