bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): Released all slaves
bond2 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 26 at net/core/dev.c:8991 rollback_registered_many+0xbcf/0xf60 net/core/dev.c:8991
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 26 Comm: kworker/u4:2 Not tainted 5.8.0-rc3-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+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563
RIP: 0010:rollback_registered_many+0xbcf/0xf60 net/core/dev.c:8991
Code: 0f 8e d1 02 00 00 41 0f b7 96 08 04 00 00 31 f6 4c 89 f7 e8 f3 d9 fc ff e9 4f fe ff ff 4c 89 e7 e9 48 fd ff ff e8 a1 5c 3e fb <0f> 0b e9 da fd ff ff e8 95 5c 3e fb 0f 0b e9 18 fe ff ff e8 89 5c
RSP: 0018:ffffc90000e279e0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff86355897
RDX: ffff8880a903c0c0 RSI: ffffffff86355abf RDI: 0000000000000001
RBP: 00000000a1e17f01 R08: 0000000000000000 R09: ffffffff8a7b30c7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808c00e600
R13: 0000000000034960 R14: ffff88802da0c000 R15: ffff888097467b40
 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10113
 unregister_netdevice_many net/core/dev.c:10112 [inline]
 default_device_exit_batch+0x30c/0x3d0 net/core/dev.c:10596
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:189
 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Kernel Offset: disabled
Rebooting in 86400 seconds..