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: 0 PID: 16444 Comm: kworker/0:7 Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 assign_lock_key kernel/locking/lockdep.c:937 [inline] register_lock_class+0x1077/0x1180 kernel/locking/lockdep.c:1249 __lock_acquire+0x102/0x5230 kernel/locking/lockdep.c:4781 lock_acquire kernel/locking/lockdep.c:5512 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5477 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:359 [inline] lock_sock_nested+0x40/0x120 net/core/sock.c:3057 l2cap_sock_teardown_cb+0xa1/0x660 net/bluetooth/l2cap_sock.c:1528 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:622 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:825 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 4bd55067 P4D 4bd55067 PUD 607d6067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 16444 Comm: kworker/0:7 Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: events l2cap_chan_timeout RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000260fb70 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88801dce0000 RCX: 0000000000000000 RDX: 1ffff11003b9c08c RSI: ffffffff880c2b0b RDI: ffff88801dce0000 RBP: 0000000000000000 R08: ffffffff8a7e1d40 R09: ffffffff880c2776 R10: 0000000000000004 R11: 0000000000000005 R12: 000000000000006f R13: ffff888016051000 R14: ffff888016051020 R15: 0000000000000005 FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000004bd54000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: l2cap_sock_teardown_cb+0x496/0x660 net/bluetooth/l2cap_sock.c:1553 l2cap_chan_del+0xbc/0xa80 net/bluetooth/l2cap_core.c:622 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:825 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276 worker_thread+0x64c/0x1120 kernel/workqueue.c:2422 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Modules linked in: CR2: 0000000000000000 ---[ end trace 94e4886b07409701 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 0018:ffffc9000260fb70 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88801dce0000 RCX: 0000000000000000 RDX: 1ffff11003b9c08c RSI: ffffffff880c2b0b RDI: ffff88801dce0000 RBP: 0000000000000000 R08: ffffffff8a7e1d40 R09: ffffffff880c2776 R10: 0000000000000004 R11: 0000000000000005 R12: 000000000000006f R13: ffff888016051000 R14: ffff888016051020 R15: 0000000000000005 FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 000000004bd54000 CR4: 0000000000150ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400