WARNING: ODEBUG bug in del_timer (3)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 71ae5fc8 Merge tag 'linux-kselftest-5.2-rc1' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=136c06f0a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=511168bc7720867
dashboard link: https://syzkaller.appspot.com/bug?extid=13d91ed9bbcd7dc13230
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17128012a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+13d91e...@syzkaller.appspotmail.com

------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list
hint: (null)
WARNING: CPU: 1 PID: 22 at lib/debugobjects.c:325
debug_print_object+0x16a/0x250 lib/debugobjects.c:325
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.1.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: events sk_psock_destroy_deferred
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2cb/0x65c kernel/panic.c:214
__warn.cold+0x20/0x45 kernel/panic.c:566
report_bug+0x263/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:972
RIP: 0010:debug_print_object+0x16a/0x250 lib/debugobjects.c:325
Code: dd 60 f4 a1 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48
8b 14 dd 60 f4 a1 87 48 c7 c7 00 ea a1 87 e8 44 02 12 fe <0f> 0b 83 05 31
10 2d 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3
RSP: 0018:ffff8880a9a3f970 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815aec76 RDI: ffffed1015347f20
RBP: ffff8880a9a3f9b0 R08: ffff8880a9a2a5c0 R09: ffffed1015d240f1
R10: ffffed1015d240f0 R11: ffff8880ae920787 R12: 0000000000000001
R13: ffffffff889ac720 R14: ffffffff81605b60 R15: ffff8880990fdba8
debug_object_assert_init lib/debugobjects.c:694 [inline]
debug_object_assert_init+0x23d/0x2f0 lib/debugobjects.c:665
debug_timer_assert_init kernel/time/timer.c:725 [inline]
debug_assert_init kernel/time/timer.c:770 [inline]
del_timer+0x7c/0x120 kernel/time/timer.c:1192
try_to_grab_pending+0x2d7/0x710 kernel/workqueue.c:1249
__cancel_work_timer+0xc4/0x520 kernel/workqueue.c:3079
cancel_delayed_work_sync+0x1b/0x20 kernel/workqueue.c:3252
strp_done+0x5d/0xf0 net/strparser/strparser.c:526
sk_psock_destroy_deferred+0x3a/0x6c0 net/core/skmsg.c:558
process_one_work+0x98e/0x1790 kernel/workqueue.c:2263
worker_thread+0x98/0xe40 kernel/workqueue.c:2409
kthread+0x357/0x430 kernel/kthread.c:253
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[Jakub Kicinski]

CCing John, looks like John's upcoming fix may address this:

bpf: sockmap, only stop/flush strp if it was enabled at some point

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.