------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 arch/x86/include/asm/paravirt.h:752
WARNING: CPU: 0 PID: 108 at lib/debugobjects.c:484 debug_print_object+0x168/0x210 lib/debugobjects.c:481
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 108 Comm: kworker/u4:3 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x12d/0x187 lib/dump_stack.c:118
 panic+0x22a/0x4e3 kernel/panic.c:221
 __warn.cold.10+0x25/0x2a kernel/panic.c:582
 report_bug+0x1b0/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:debug_print_object+0x168/0x210 lib/debugobjects.c:481
Code: cd 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 40 55 cd 87 4c 89 fe 48 c7 c7 a0 4a cd 87 e8 90 36 e6 fd <0f> 0b 83 05 23 ab 56 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc900012a7850 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8a926320
RBP: ffffc900012a7890 R08: ffffed1015d46621 R09: ffffed1015d46621
R10: ffffed1015d46620 R11: ffff8880aea33107 R12: 0000000000000001
R13: ffffffff88da2f80 R14: ffffffff815a91b0 R15: ffffffff87cd51a0
 __debug_check_no_obj_freed lib/debugobjects.c:963 [inline]
 debug_check_no_obj_freed+0x2db/0x436 lib/debugobjects.c:994
 kfree+0xf6/0x2c0 mm/slab.c:3756
 kvfree+0x2c/0x30 mm/util.c:603
 netdev_freemem+0x47/0x60 net/core/dev.c:9686
 netdev_release+0x6c/0x90 net/core/net-sysfs.c:1644
 device_release+0x6a/0x1c0 drivers/base/core.c:1358
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x153/0x220 lib/kobject.c:739
 netdev_run_todo+0x453/0x6b0 net/core/dev.c:9591
 rtnl_unlock+0x9/0x10 net/core/rtnetlink.c:112
 default_device_exit_batch+0x2f8/0x3e0 net/core/dev.c:10382
 ops_exit_list.isra.6+0xdf/0x130 net/core/net_namespace.c:175
 cleanup_net+0x499/0x9c0 net/core/net_namespace.c:597
 process_one_work+0x856/0x1630 kernel/workqueue.c:2264
 worker_thread+0x85/0xb60 kernel/workqueue.c:2410
 kthread+0x331/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..