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SubjectWARNING: ODEBUG bug in cancel_delayed_work

syzbot found the following issue on:

HEAD commit: 27a2145d ibmvnic: Fix IRQ mapping disposal in error path
git tree: net
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro:
C reproducer:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0
WARNING: CPU: 0 PID: 6858 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 lib/debugobjects.c:485
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6858 Comm: syz-executor296 Not tainted 5.8.0-rc6-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+0x18f/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:231
__warn.cold+0x20/0x45 kernel/panic.c:600
report_bug+0x1bd/0x210 lib/bug.c:198
handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:540
RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:485
Code: dd a0 9f 93 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd a0 9f 93 88 48 c7 c7 00 95 93 88 e8 b2 ae a9 fd <0f> 0b 83 05 db 0b 14 07 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89
RSP: 0018:ffffc9000168f578 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000
RDX: ffff888096dec4c0 RSI: ffffffff815d4ef7 RDI: fffff520002d1ea1
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ae620fcb
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89bcc540
R13: ffffffff81630df0 R14: ffff888095382200 R15: 1ffff920002d1eba
debug_object_assert_init lib/debugobjects.c:870 [inline]
debug_object_assert_init+0x1f4/0x2e0 lib/debugobjects.c:841
debug_timer_assert_init kernel/time/timer.c:736 [inline]
debug_assert_init kernel/time/timer.c:781 [inline]
del_timer+0x6d/0x110 kernel/time/timer.c:1207
try_to_grab_pending kernel/workqueue.c:1249 [inline]
__cancel_work kernel/workqueue.c:3221 [inline]
cancel_delayed_work+0xe0/0x450 kernel/workqueue.c:3250
l2cap_clear_timer include/net/bluetooth/l2cap.h:879 [inline]
l2cap_chan_del+0x541/0x1300 net/bluetooth/l2cap_core.c:661
l2cap_chan_close+0x118/0xb10 net/bluetooth/l2cap_core.c:824
l2cap_sock_shutdown+0x3b8/0xe90 net/bluetooth/l2cap_sock.c:1339
l2cap_sock_release+0x63/0x1d0 net/bluetooth/l2cap_sock.c:1382
__sock_release+0xcd/0x280 net/socket.c:605
sock_close+0x18/0x20 net/socket.c:1278
__fput+0x33c/0x880 fs/file_table.c:281
task_work_run+0xdd/0x190 kernel/task_work.c:135
exit_task_work include/linux/task_work.h:25 [inline]
do_exit+0xb72/0x2a40 kernel/exit.c:805
do_group_exit+0x125/0x310 kernel/exit.c:903
get_signal+0x40b/0x1ee0 kernel/signal.c:2743
do_signal+0x82/0x2520 arch/x86/kernel/signal.c:810
exit_to_usermode_loop arch/x86/entry/common.c:235 [inline]
__prepare_exit_to_usermode+0x156/0x1f0 arch/x86/entry/common.c:269
do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393
RIP: 0033:0x446d69
Code: Bad RIP value.
RSP: 002b:00007ffc69898b98 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 0000000000446d69
RDX: 000000000000000e RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007ffc69898bd0 R08: 0000000000000000 R09: 00000000000000ff
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..

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