syzbot

------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0
WARNING: CPU: 0 PID: 6849 at lib/debugobjects.c:488 debug_print_object lib/debugobjects.c:485 [inline]
WARNING: CPU: 0 PID: 6849 at lib/debugobjects.c:488 debug_object_assert_init+0x1fa/0x250 lib/debugobjects.c:870
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6849 Comm: syz-executor864 Not tainted 5.9.0-rc1-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+0x1f0/0x31e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:debug_print_object lib/debugobjects.c:485 [inline]
RIP: 0010:debug_object_assert_init+0x1fa/0x250 lib/debugobjects.c:870
Code: e8 9b 19 10 fe 4c 8b 45 00 48 c7 c7 63 99 15 89 48 c7 c6 5d 98 15 89 48 c7 c2 42 3e 2d 89 31 c9 49 89 d9 31 c0 e8 76 e6 a1 fd <0f> 0b ff 05 da 8a ea 05 48 83 c5 38 48 89 e8 48 c1 e8 03 42 80 3c
RSP: 0018:ffffc900052f7840 EFLAGS: 00010046
RAX: 70f07cea71b7be00 RBX: 0000000000000000 RCX: ffff8880a86d8440
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff89502bc0 R08: ffffffff815e2109 R09: ffffed1015d041c3
R10: ffffed1015d041c3 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a31bc200 R14: 0000000000000002 R15: ffffffff8b9f6688
 debug_timer_assert_init kernel/time/timer.c:742 [inline]
 debug_assert_init kernel/time/timer.c:787 [inline]
 del_timer+0x2f/0x390 kernel/time/timer.c:1205
 try_to_grab_pending+0xba/0x9f0 kernel/workqueue.c:1249
 __cancel_work kernel/workqueue.c:3221 [inline]
 cancel_delayed_work+0x37/0x2b0 kernel/workqueue.c:3250
 l2cap_clear_timer include/net/bluetooth/l2cap.h:879 [inline]
 l2cap_chan_del+0x5bf/0x760 net/bluetooth/l2cap_core.c:661
 l2cap_chan_close+0x7bf/0xae0 net/bluetooth/l2cap_core.c:823
 l2cap_sock_shutdown+0x39f/0x700 net/bluetooth/l2cap_sock.c:1339
 l2cap_sock_release+0x63/0x190 net/bluetooth/l2cap_sock.c:1382
 __sock_release net/socket.c:596 [inline]
 sock_close+0xd8/0x260 net/socket.c:1277
 __fput+0x34f/0x7b0 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:141
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0x5f3/0x1f20 kernel/exit.c:806
 do_group_exit+0x161/0x2d0 kernel/exit.c:903
 get_signal+0x13bb/0x1d50 kernel/signal.c:2757
 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
 exit_to_user_mode_prepare+0x8d/0x1b0 kernel/entry/common.c:166
 syscall_exit_to_user_mode+0x5e/0x1a0 kernel/entry/common.c:241
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446d99
Code: Bad RIP value.
RSP: 002b:00007ffe6690c978 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000446d99
RDX: 000000000000000e RSI: 0000000020000080 RDI: 0000000000000004
RBP: 0000000000000003 R08: 00000000000000ff R09: 00000000000000ff
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000ab7850
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..