bond0 (unregistering): Releasing backup interface bond_slave_1 bond0 (unregistering): Releasing backup interface bond_slave_0 bond0 (unregistering): Released all slaves ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 kernel/workqueue.c:4852 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 2320 at lib/debugobjects.c:287 debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 2320 Comm: kworker/u4:3 Not tainted 4.14.174-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:17 [inline] dump_stack+0x13e/0x194 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:963 RIP: 0010:debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287 RSP: 0018:ffff8880a14bf900 EFLAGS: 00010082 RAX: 0000000000000061 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff86ac07e0 RDI: ffffed1014297f16 RBP: ffffffff86abba60 R08: 0000000000000061 R09: 0000000000000000 R10: fffffbfff14a8cd9 R11: ffff8880a147e640 R12: ffffffff813ba450 R13: 0000000000000000 R14: ffffffff8a6b2c88 R15: ffff888098976850 __debug_check_no_obj_freed lib/debugobjects.c:747 [inline] debug_check_no_obj_freed+0x3cd/0x6e4 lib/debugobjects.c:776 kfree+0xbb/0x260 mm/slab.c:3814 kvfree+0x45/0x50 mm/util.c:416 device_release+0x15f/0x1a0 drivers/base/core.c:833 kobject_cleanup lib/kobject.c:646 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put+0x13e/0x1f0 lib/kobject.c:692 netdev_run_todo+0x4a9/0x710 net/core/dev.c:7954 default_device_exit_batch+0x2e7/0x380 net/core/dev.c:8740 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:145 cleanup_net+0x3bb/0x820 net/core/net_namespace.c:484 process_one_work+0x813/0x1540 kernel/workqueue.c:2116 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 ======================================================