ODEBUG: assert_init not available (active state 0) object type: timer_list hint: (null) ------------[ cut here ]------------ WARNING: CPU: 0 PID: 15136 at lib/debugobjects.c:287 debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 15136 Comm: syz-executor.5 Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 panic+0x1f9/0x42d kernel/panic.c:183 __warn.cold+0x20/0x44 kernel/panic.c:547 report_bug+0x208/0x250 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] fixup_bug arch/x86/kernel/traps.c:172 [inline] do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964 RIP: 0010:debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287 RSP: 0018:ffff88804996f6b8 EFLAGS: 00010082 RAX: 0000000000000061 RBX: 0000000000000005 RCX: 0000000000000000 RDX: 000000000001b3c8 RSI: ffffffff81441a30 RDI: ffffed100932decd RBP: ffffffff878b6e80 R08: 0000000000000061 R09: 0000000000000003 R10: 0000000000000000 R11: ffff8880a2716440 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8880a43bc5f0 R15: 1ffff1100932dee0 debug_object_assert_init lib/debugobjects.c:656 [inline] debug_object_assert_init+0x1d3/0x2d0 lib/debugobjects.c:627 debug_timer_assert_init kernel/time/timer.c:708 [inline] debug_assert_init kernel/time/timer.c:756 [inline] del_timer+0x5d/0xe0 kernel/time/timer.c:1151 try_to_grab_pending+0x243/0x610 kernel/workqueue.c:1225 __cancel_work+0x68/0x240 kernel/workqueue.c:3032 l2cap_clear_timer include/net/bluetooth/l2cap.h:834 [inline] l2cap_chan_del+0x4b5/0x950 net/bluetooth/l2cap_core.c:641 l2cap_chan_close+0x103/0x870 net/bluetooth/l2cap_core.c:757 l2cap_sock_shutdown+0x2e7/0xc20 net/bluetooth/l2cap_sock.c:1160 l2cap_sock_release+0x77/0x280 net/bluetooth/l2cap_sock.c:1203 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 get_signal+0x18a3/0x1ca0 kernel/signal.c:2234 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4665d9 RSP: 002b:00007fcbe8b98188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: 000000000000000e RSI: 00000000200011c0 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffcfc3a328f R14: 00007fcbe8b98300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..