bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 0 PID: 28130 at net/sched/sch_cbq.c:1437 cbq_destroy_class+0x11a/0x150 net/sched/sch_cbq.c:1437
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 28130 Comm: kworker/u4:0 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+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x3e kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:cbq_destroy_class+0x11a/0x150 net/sched/sch_cbq.c:1437
Code: 00 00 e8 c9 38 db ff 49 39 dc 74 0d e8 1f 0a 1c fb 4c 89 e7 e8 b7 5f 5a fb e8 12 0a 1c fb 5b 41 5c 41 5d 5d c3 e8 06 0a 1c fb <0f> 0b e9 37 ff ff ff e8 7a af 5a fb e9 12 ff ff ff e8 90 af 5a fb
RSP: 0018:ffffc90001a17858 EFLAGS: 00010293
RAX: ffff8880566ae2c0 RBX: ffff88809ada2000 RCX: ffffffff8659722f
RDX: 0000000000000000 RSI: ffffffff865972fa RDI: 0000000000000005
RBP: ffffc90001a17870 R08: ffff8880566ae2c0 R09: fffffbfff16a2f70
R10: fffffbfff16a2f6f R11: ffffffff8b517b7f R12: ffff88809ada2320
R13: 00000000ffffffdd R14: 0000000000000000 R15: ffff88809ada2320
 cbq_destroy net/sched/sch_cbq.c:1471 [inline]
 cbq_destroy+0x208/0x2c0 net/sched/sch_cbq.c:1447
 qdisc_destroy+0x11f/0x670 net/sched/sch_generic.c:958
 qdisc_put+0xdb/0x100 net/sched/sch_generic.c:985
 shutdown_scheduler_queue net/sched/sch_generic.c:1302 [inline]
 dev_shutdown+0x290/0x4a3 net/sched/sch_generic.c:1310
 rollback_registered_many+0x6c6/0x1030 net/core/dev.c:8813
 unregister_netdevice_many.part.0+0x1b/0x1f0 net/core/dev.c:9976
 unregister_netdevice_many net/core/dev.c:9975 [inline]
 default_device_exit_batch+0x360/0x420 net/core/dev.c:10452
 ops_exit_list.isra.0+0x10c/0x160 net/core/net_namespace.c:175
 cleanup_net+0x549/0xb10 net/core/net_namespace.c:589
 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..