netdev - Re: [syzbot] BUG: MAX_LOCKDEP

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Date:   Tue, 08 Nov 2022 05:40:42 -0800
From:   syzbot <syzbot+a70a6358abd2c3f9550f@...kaller.appspotmail.com>
To:     Jason@...c4.com, davem@...emloft.net, dvyukov@...gle.com,
        edumazet@...gle.com, jiri@...nulli.us, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, penguin-kernel@...ove.sakura.ne.jp,
        peterz@...radead.org, rdunlap@...radead.org,
        syzkaller-bugs@...glegroups.com, tonymarislogistics@...dex.com,
        wireguard@...ts.zx2c4.com
Subject: Re: [syzbot] BUG: MAX_LOCKDEP_KEYS too low! (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    3577a7611842 Merge branches 'for-next/acpi', 'for-next/kbu..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=15ea3e61880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=606e57fd25c5c6cc
dashboard link: https://syzkaller.appspot.com/bug?extid=a70a6358abd2c3f9550f
compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=168c4c99880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=145d6376880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/054b1f56af52/disk-3577a761.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c616835b2a22/vmlinux-3577a761.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9825c28b2090/Image-3577a761.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a70a6358abd2c3f9550f@...kaller.appspotmail.com

netlink: 4 bytes leftover after parsing attributes in process `syz-executor357'.
device team6635 entered promiscuous mode
8021q: adding VLAN 0 to HW filter on device team6635
BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 0 PID: 9692 Comm: syz-executor357 Not tainted 6.1.0-rc4-syzkaller-31844-g3577a7611842 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156
 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 register_lock_class+0x2e4/0x2f8 kernel/locking/lockdep.c:1326
 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934
 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668
 __mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 team_vlan_rx_add_vid+0x38/0xd8 drivers/net/team/team.c:1904
 vlan_add_rx_filter_info net/8021q/vlan_core.c:211 [inline]
 __vlan_vid_add net/8021q/vlan_core.c:306 [inline]
 vlan_vid_add+0x328/0x38c net/8021q/vlan_core.c:336
 vlan_device_event+0x200/0xc4c net/8021q/vlan.c:385
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455
 __dev_notify_flags+0x170/0x2e8
 rtnl_newlink_create+0x460/0x6bc net/core/rtnetlink.c:3372
 __rtnl_newlink net/core/rtnetlink.c:3581 [inline]
 rtnl_newlink+0x728/0xa04 net/core/rtnetlink.c:3594
 rtnetlink_rcv_msg+0x484/0x82c net/core/rtnetlink.c:6091
 netlink_rcv_skb+0xe8/0x1d4 net/netlink/af_netlink.c:2540
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6109
 netlink_unicast_kernel+0xfc/0x1dc net/netlink/af_netlink.c:1319
 netlink_unicast+0x164/0x248 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x484/0x584 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0x2f8/0x440 net/socket.c:2482
 ___sys_sendmsg net/socket.c:2536 [inline]
 __sys_sendmsg+0x1ac/0x228 net/socket.c:2565
 __do_sys_sendmsg net/socket.c:2574 [inline]
 __se_sys_sendmsg net/socket.c:2572 [inline]
 __arm64_sys_sendmsg+0x2c/0x3c net/socket.c:2572
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581