WARNING: locking bug in ip6_datagram_connect (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=177c92e8880000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=27d8fd1be4e4a6f9a868
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+27d8fd...@syzkaller.appspotmail.com

WARNING: CPU: 0 PID: 1051 at kernel/locking/lockdep.c:698 arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline]
WARNING: CPU: 0 PID: 1051 at kernel/locking/lockdep.c:698 look_up_lock_class kernel/locking/lockdep.c:689 [inline]
WARNING: CPU: 0 PID: 1051 at kernel/locking/lockdep.c:698 register_lock_class+0x77b/0x11c0 kernel/locking/lockdep.c:749
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1051 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
__warn.cold+0x20/0x5a kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:183
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:look_up_lock_class kernel/locking/lockdep.c:698 [inline]
RIP: 0010:register_lock_class+0x77b/0x11c0 kernel/locking/lockdep.c:749
Code: 8b 05 c9 63 ec 0b 85 c0 0f 85 17 ff ff ff 48 c7 c6 e0 1b 6a 88 48 c7 c7 40 19 6a 88 e8 c3 29 a8 06 0f 0b e9 fd fe ff ff 0f 0b <0f> 0b e9 b3 fa ff ff 48 8d 70 01 48 69 c0 50 01 00 00 48 89 35 ac
RSP: 0018:ffff8880507c7a30 EFLAGS: 00010087
RAX: dffffc0000000000 RBX: ffff8880946560e0 RCX: 0000000000000000
RDX: 1ffff110128cac1f RSI: 0000000000000000 RDI: ffff8880946560f8
RBP: 0000000000000000 R08: 0000000000000000 R09: 1ffff1100a0f8f4e
R10: ffffffff8d243760 R11: 0000000000000000 R12: ffffffff8cdd43d0
R13: ffffffff894c35a0 R14: 1ffff1100a0f8f4e R15: 0000000000000000
__lock_acquire+0x17d/0x3ff0 kernel/locking/lockdep.c:3304
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:168
spin_lock_bh include/linux/spinlock.h:334 [inline]
release_sock+0x1b/0x1b0 net/core/sock.c:2899
ip6_datagram_connect+0x36/0x40 net/ipv6/datagram.c:276
inet_dgram_connect+0x14a/0x2d0 net/ipv4/af_inet.c:571
__sys_connect+0x265/0x2c0 net/socket.c:1775
__do_sys_connect net/socket.c:1786 [inline]
__se_sys_connect net/socket.c:1783 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1783
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f891ede83c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f891d73c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f891eefb050 RCX: 00007f891ede83c9
RDX: 000000000000001c RSI: 0000000020000040 RDI: 0000000000000006
RBP: 00007f891ee4333f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffc9eb310f R14: 00007f891d73c300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.