WARNING in aa_sock_msg_perm

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ad326970 Linux 4.19.152
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=142da2c4500000
kernel config: https://syzkaller.appspot.com/x/.config?x=1ec7667b405157e
dashboard link: https://syzkaller.appspot.com/bug?extid=2a04355bc0c85287acea
compiler: gcc (GCC) 10.1.0-syz 20200507

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+2a0435...@syzkaller.appspotmail.com

------------[ cut here ]------------
AppArmor WARN aa_sock_msg_perm: ((!sock)):
WARNING: CPU: 0 PID: 28645 at security/apparmor/lsm.c:931 aa_sock_msg_perm.constprop.0+0xd1/0x160 security/apparmor/lsm.c:931
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 28645 Comm: vhci_tx Not tainted 4.19.152-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
__warn.cold+0x20/0x61 kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:186
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:aa_sock_msg_perm.constprop.0+0xd1/0x160 security/apparmor/lsm.c:931
Code: 89 ee 4c 89 e7 5b 5d 41 5c 41 5d 41 5e e9 57 1a 02 00 e8 32 1b 18 fe 48 c7 c6 c0 4b ae 88 48 c7 c7 00 3a ae 88 e8 2a f9 eb fd <0f> 0b e9 4a ff ff ff e8 13 1b 18 fe 48 c7 c6 c0 4b ae 88 48 c7 c7
RSP: 0018:ffff88822e51fb80 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814fd8d1 RDI: ffffed1045ca3f62
RBP: ffff88822e51fce8 R08: 0000000000000000 R09: 00000000000014dd
R10: 0000000000000006 R11: 0000000000000000 R12: ffffffff88ae47c0
R13: 0000000000000002 R14: ffff88822e51fce8 R15: 0000000000000000
security_socket_sendmsg+0x50/0xb0 security/security.c:1413
sock_sendmsg+0x3f/0x120 net/socket.c:629
vhci_send_cmd_submit+0x8a4/0xf90 drivers/usb/usbip/vhci_tx.c:139
vhci_tx_loop+0xfc/0x36b drivers/usb/usbip/vhci_tx.c:243
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
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.