------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x80 arch/x86/include/asm/paravirt.h:759
WARNING: CPU: 0 PID: 337 at lib/debugobjects.c:488 debug_print_object lib/debugobjects.c:485 [inline]
WARNING: CPU: 0 PID: 337 at lib/debugobjects.c:488 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
WARNING: CPU: 0 PID: 337 at lib/debugobjects.c:488 debug_check_no_obj_freed+0x45c/0x640 lib/debugobjects.c:998
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 337 Comm: kworker/u4:6 Not tainted 5.7.0-rc6-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+0x1e9/0x30e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:221
 __warn+0x209/0x210 kernel/panic.c:582
 report_bug+0x1ac/0x2d0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 do_error_trap+0xca/0x1c0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:debug_print_object lib/debugobjects.c:485 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
RIP: 0010:debug_check_no_obj_freed+0x45c/0x640 lib/debugobjects.c:998
Code: 74 08 4c 89 f7 e8 24 59 14 fe 4d 8b 06 48 c7 c7 ef da f2 88 48 c7 c6 64 c3 f0 88 48 89 da 89 e9 4d 89 f9 31 c0 e8 24 74 a8 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df ff 05 56 02 cf 05 48 8b 5c 24
RSP: 0018:ffffc90002077a10 EFLAGS: 00010046
RAX: 98df5fabfb206d00 RBX: ffffffff88f6c5b3 RCX: ffff8880a8bdc440
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff815cd2b9 R09: ffffed1015d045ca
R10: ffffed1015d045ca R11: 0000000000000000 R12: ffff88806fd5fb04
R13: ffffffff8b7a4678 R14: ffffffff892ecb60 R15: ffffffff814b8040
 kfree+0xfc/0x220 mm/slab.c:3756
 device_release+0x70/0x1a0 drivers/base/core.c:1371
 kobject_cleanup lib/kobject.c:693 [inline]
 kobject_release lib/kobject.c:722 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1cf/0x290 lib/kobject.c:739
 netdev_run_todo+0xb37/0xcb0 net/core/dev.c:9670
 default_device_exit_batch+0x647/0x690 net/core/dev.c:10474
 ops_exit_list net/core/net_namespace.c:189 [inline]
 cleanup_net+0x78c/0xb80 net/core/net_namespace.c:603
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Kernel Offset: disabled
Rebooting in 86400 seconds..