hid-generic 0000:0000:0000.0029: unknown main item tag 0x0
hid-generic 0000:0000:0000.0029: unknown main item tag 0x0
hid-generic 0000:0000:0000.0029: unknown main item tag 0x0
hid-generic 0000:0000:0000.0029: unknown main item tag 0x0
------------[ cut here ]------------
WARNING: CPU: 1 PID: 19443 at lib/debugobjects.c:263 debug_print_object+0x181/0x210 lib/debugobjects.c:260
ODEBUG: free active (active state 0) object type: work_struct hint: flow_cache_gc_task+0x0/0x4b0 net/core/flow.c:247
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 19443 Comm: kworker/u4:19 Not tainted 4.9.141+ #1
Workqueue: netns cleanup_net
 ffff8801c9427770 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82b44c00 0000000000000001 0000000000000009 ffff8801c9427830
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b62b ffffffff813f6f66
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dbec2>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565
 [<ffffffff81ba8561>] debug_print_object+0x181/0x210 lib/debugobjects.c:260
 [<ffffffff81baad6e>] __debug_check_no_obj_freed lib/debugobjects.c:720 [inline]
 [<ffffffff81baad6e>] debug_check_no_obj_freed+0x4ae/0x890 lib/debugobjects.c:749
 [<ffffffff814ef3a4>] slab_free_hook mm/slub.c:1348 [inline]
 [<ffffffff814ef3a4>] slab_free_freelist_hook mm/slub.c:1377 [inline]
 [<ffffffff814ef3a4>] slab_free mm/slub.c:2958 [inline]
 [<ffffffff814ef3a4>] kmem_cache_free+0x1a4/0x310 mm/slub.c:2980
 [<ffffffff822e66c2>] net_free net/core/net_namespace.c:374 [inline]
 [<ffffffff822e66c2>] net_drop_ns+0x62/0x80 net/core/net_namespace.c:381
 [<ffffffff822e6d07>] cleanup_net+0x627/0x8b0 net/core/net_namespace.c:491
 [<ffffffff81131001>] process_one_work+0x831/0x15f0 kernel/workqueue.c:2092
 [<ffffffff81131e96>] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Kernel Offset: disabled
Rebooting in 86400 seconds..