WARNING: ODEBUG bug in __tcindex_destroy

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: a41ba30d Linux 4.14.181
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11f1acba100000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5458e9cda81cf95
dashboard link: https://syzkaller.appspot.com/bug?extid=caf3bc50f1f49b23ca68
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+caf3bc...@syzkaller.appspotmail.com

ODEBUG: free active (active state 0) object type: rcu_head hint: (null)
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7 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: 7 Comm: ksoftirqd/0 Not tainted 4.14.181-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+0x1b2/0x283 lib/dump_stack.c:58
panic+0x1f9/0x42d kernel/panic.c:183
__warn.cold+0x2f/0x30 kernel/panic.c:547
report_bug+0x20a/0x248 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:ffff8880a9ce7bb0 EFLAGS: 00010086
RAX: 0000000000000051 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff868c0a40 RDI: ffffed101539cf6c
RBP: ffffffff868b6180 R08: 0000000000000051 R09: 0000000000000000
R10: fffffbfff1467eef R11: ffff8880a9cd81c0 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8a510008 R15: ffff88808b48e930
__debug_check_no_obj_freed lib/debugobjects.c:747 [inline]
debug_check_no_obj_freed+0x393/0x5fd lib/debugobjects.c:776
kfree+0xbb/0x260 mm/slab.c:3814
__tcindex_destroy+0x2e/0x70 net/sched/cls_tcindex.c:253
__rcu_reclaim kernel/rcu/rcu.h:195 [inline]
rcu_do_batch kernel/rcu/tree.c:2699 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2962 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2929 [inline]
rcu_process_callbacks+0x78d/0x1180 kernel/rcu/tree.c:2946
__do_softirq+0x254/0x9bf kernel/softirq.c:288
run_ksoftirqd+0x50/0x1a0 kernel/softirq.c:670
smpboot_thread_fn+0x5c1/0x920 kernel/smpboot.c:164
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

======================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.