------------[ 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: 1 PID: 306 at lib/debugobjects.c:488 debug_print_object lib/debugobjects.c:485 [inline] WARNING: CPU: 1 PID: 306 at lib/debugobjects.c:488 __debug_check_no_obj_freed lib/debugobjects.c:967 [inline] WARNING: CPU: 1 PID: 306 at lib/debugobjects.c:488 debug_check_no_obj_freed+0x468/0x620 lib/debugobjects.c:998 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 306 Comm: kworker/u4:5 Not tainted 5.6.0-rc2-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+0x1fb/0x318 lib/dump_stack.c:118 panic+0x264/0x7a9 kernel/panic.c:221 __warn+0x209/0x210 kernel/panic.c:582 report_bug+0x1b6/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0xcf/0x1c0 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 lib/debugobjects.c:485 [inline] RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:967 [inline] RIP: 0010:debug_check_no_obj_freed+0x468/0x620 lib/debugobjects.c:998 Code: 08 48 89 df e8 59 41 0f fe 4c 8b 03 48 c7 c7 e5 e3 f0 88 48 c7 c6 ef d4 ee 88 4c 89 e2 44 89 f9 4d 89 e9 31 c0 e8 48 d7 a3 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 6d b0 ff 05 d6 f0 c4 05 RSP: 0018:ffffc90001ed7958 EFLAGS: 00010046 RAX: c81588805ecd5300 RBX: ffffffff892ddb78 RCX: ffff8880a8af4600 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc90001ed79f0 R08: ffffffff81600324 R09: ffffed1015d64592 R10: ffffed1015d64592 R11: 0000000000000000 R12: ffffffff88f4c14a R13: ffffffff814ee0e0 R14: ffff888045e8a000 R15: 0000000000000000 kfree+0xff/0x220 mm/slab.c:3756 kvfree+0x35/0x40 mm/util.c:603 netdev_freemem+0x3e/0x60 net/core/dev.c:9751 netdev_release+0x79/0xa0 net/core/net-sysfs.c:1644 device_release+0x74/0x1a0 drivers/base/core.c:1354 kobject_cleanup lib/kobject.c:693 [inline] kobject_release lib/kobject.c:722 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1fa/0x2a0 lib/kobject.c:739 netdev_run_todo+0xc3b/0xdd0 net/core/dev.c:9656 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:112 default_device_exit_batch+0x633/0x670 net/core/dev.c:10453 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x78b/0xb80 net/core/net_namespace.c:589 process_one_work+0x7f5/0x10f0 kernel/workqueue.c:2264 worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..