BUG: unable to handle page fault for address: 0000000000003800
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 10ae7a067 P4D 10ae7a067 PUD 10cde5067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP
CPU: 1 PID: 24089 Comm: syz-executor.3 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x2d/0x50 lib/list_debug.c:51
Code: 01 00 00 00 00 ad de 48 8b 07 48 8b 57 08 48 39 c8 0f 84 34 97 84 01 48 b9 22 01 00 00 00 00 ad de 48 39 ca 0f 84 57 97 84 01 <48> 8b 32 48 39 fe 0f 85 37 97 84 01 48 8b 50 08 48 39 f2 0f 85 1c
RSP: 0018:ffffc90001a13bc0 EFLAGS: 00010217
RAX: 1000002000000000 RBX: ffff88810ace6080 RCX: dead000000000122
RDX: 0000000000003800 RSI: ffffffff848fb83c RDI: ffff88810ace6080
RBP: 0000000000000000 R08: ffffffff831ab647 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000067
R13: ffff888111554e60 R14: ffff88811394d148 R15: ffff8881115549d8
FS:  0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000003800 CR3: 00000001095ef000 CR4: 0000000000350ee0
Call Trace:
 __list_del_entry include/linux/list.h:132 [inline]
 list_del_rcu include/linux/rculist.h:166 [inline]
 hci_chan_del+0x16/0x90 net/bluetooth/hci_conn.c:1741
 l2cap_conn_del+0x166/0x250 net/bluetooth/l2cap_core.c:1906
 hci_disconn_cfm include/net/bluetooth/hci_core.h:1462 [inline]
 hci_conn_hash_flush+0x6c/0xe0 net/bluetooth/hci_conn.c:1565
 hci_dev_do_close+0x214/0x5a0 net/bluetooth/hci_core.c:1776
 hci_unregister_dev+0xc5/0x330 net/bluetooth/hci_core.c:3872
 vhci_release+0x2a/0x60 drivers/bluetooth/hci_vhci.c:340
 __fput+0xa1/0x250 fs/file_table.c:280
 task_work_run+0x68/0xb0 kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0x414/0xd10 kernel/exit.c:825
 do_group_exit+0x42/0xb0 kernel/exit.c:922
 get_signal+0x155/0xd60 kernel/signal.c:2770
 arch_do_signal_or_restart+0xaa/0x8c0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x108/0x200 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4179b1
Code: Unable to access opcode bytes at RIP 0x417987.
RSP: 002b:00007ffef9af0200 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: 0000000000000003 RBX: 00007ffef9af0234 RCX: 00000000004179b1
RDX: 00007ffef9af023a RSI: 0000000000080001 RDI: 00000000004c392c
RBP: 00007ffef9af0230 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000075 R11: 0000000000000293 R12: 00000000004c392c
R13: 00007ffef9af0750 R14: 0000000000000000 R15: 00007ffef9af0760
Modules linked in:
CR2: 0000000000003800
---[ end trace 946feb38933ab5a5 ]---
RIP: 0010:__list_del_entry_valid+0x2d/0x50 lib/list_debug.c:51
Code: 01 00 00 00 00 ad de 48 8b 07 48 8b 57 08 48 39 c8 0f 84 34 97 84 01 48 b9 22 01 00 00 00 00 ad de 48 39 ca 0f 84 57 97 84 01 <48> 8b 32 48 39 fe 0f 85 37 97 84 01 48 8b 50 08 48 39 f2 0f 85 1c
RSP: 0018:ffffc90001a13bc0 EFLAGS: 00010217
RAX: 1000002000000000 RBX: ffff88810ace6080 RCX: dead000000000122
RDX: 0000000000003800 RSI: ffffffff848fb83c RDI: ffff88810ace6080
RBP: 0000000000000000 R08: ffffffff831ab647 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000003 R12: 0000000000000067
R13: ffff888111554e60 R14: ffff88811394d148 R15: ffff8881115549d8
FS:  0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000003800 CR3: 00000001095ef000 CR4: 0000000000350ee0