INFO: trying to register non-static key in hci_uart_send_frame (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=177b845bf00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=7eaab1b4134c93d22170
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+7eaab1...@syzkaller.appspotmail.com

dccp_invalid_packet: P.type (REQUEST) not Data || [Data]Ack, while P.X == 0
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 PID: 8161 Comm: kworker/u5:5 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
new mount options do not match the existing superblock, will be ignored
Workqueue: hci6 hci_cmd_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
assign_lock_key kernel/locking/lockdep.c:728 [inline]
register_lock_class+0xe82/0x11c0 kernel/locking/lockdep.c:754
__lock_acquire+0x17d/0x3ff0 kernel/locking/lockdep.c:3304
lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
hci_uart_send_frame+0x90/0x4f0 drivers/bluetooth/hci_ldisc.c:287
hci_send_frame+0x1b3/0x370 net/bluetooth/hci_core.c:3496
hci_cmd_work+0x210/0x360 net/bluetooth/hci_core.c:4421
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Bluetooth: hci6: sending frame failed (-49)
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 14635 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
RIP: 0010:__wake_up_common+0xdf/0x650 kernel/sched/wait.c:85
Code: 05 00 00 4c 8b 43 38 49 83 e8 18 49 8d 78 18 48 3b 3c 24 0f 84 6a 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 3e 05 00 00 49 8b 40 18 89 54 24 10 31 db 48 bd
RSP: 0018:ffff88809e68f650 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880992243f8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffffffff148be2c RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffffffffffe8 R09: ffff88809e68f6f0
R10: ffff8880992243fb R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f83c02f8700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe11baae718 CR3: 00000000989f4000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__wake_up_common_lock+0xcd/0x170 kernel/sched/wait.c:121
rcu_sync_enter+0x1bc/0x300 kernel/rcu/sync.c:133
percpu_down_write+0x59/0x3f0 kernel/locking/percpu-rwsem.c:143
hci_uart_tty_close+0x186/0x2e0 drivers/bluetooth/hci_ldisc.c:544
tty_ldisc_close+0xa2/0xd0 drivers/tty/tty_ldisc.c:493
tty_ldisc_kill drivers/tty/tty_ldisc.c:639 [inline]
tty_ldisc_release+0xf5/0x440 drivers/tty/tty_ldisc.c:806
tty_release_struct+0x20/0xe0 drivers/tty/tty_io.c:1611
tty_release+0xc70/0x1210 drivers/tty/tty_io.c:1784
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0xbf3/0x2be0 kernel/exit.c:870
do_group_exit+0x125/0x310 kernel/exit.c:967
get_signal+0x3f2/0x1f70 kernel/signal.c:2589
do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f83c1983109
Code: Bad RIP value.
RSP: 002b:00007f83c02f8168 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 000000000000006b RBX: 00007f83c1a95f60 RCX: 00007f83c1983109
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 000000002001d000
RBP: 00007f83c19dd05d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe1a70a7cf R14: 00007f83c02f8300 R15: 0000000000022000
Modules linked in:
---[ end trace 39fd7c67fe7286a1 ]---
RIP: 0010:__wake_up_common+0xdf/0x650 kernel/sched/wait.c:85
Code: 05 00 00 4c 8b 43 38 49 83 e8 18 49 8d 78 18 48 3b 3c 24 0f 84 6a 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 3e 05 00 00 49 8b 40 18 89 54 24 10 31 db 48 bd
RSP: 0018:ffff88809e68f650 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880992243f8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 1ffffffff148be2c RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffffffffffe8 R09: ffff88809e68f6f0
R10: ffff8880992243fb R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f83c02f8700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f83c19830df CR3: 00000000989f4000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 05 00 00 4c 8b add $0x8b4c0000,%eax
5: 43 38 49 83 rex.XB cmp %cl,-0x7d(%r9)
9: e8 18 49 8d 78 callq 0x788d4926
e: 18 48 3b sbb %cl,0x3b(%rax)
11: 3c 24 cmp $0x24,%al
13: 0f 84 6a 02 00 00 je 0x283
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 f9 mov %rdi,%rcx
26: 48 c1 e9 03 shr $0x3,%rcx
* 2a: 80 3c 01 00 cmpb $0x0,(%rcx,%rax,1) <-- trapping instruction
2e: 0f 85 3e 05 00 00 jne 0x572
34: 49 8b 40 18 mov 0x18(%r8),%rax
38: 89 54 24 10 mov %edx,0x10(%rsp)
3c: 31 db xor %ebx,%ebx
3e: 48 rex.W
3f: bd .byte 0xbd


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[syzbot]

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