WARNING in default_device_exit_batch (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11532426f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=abf325737b513ff77aa7
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+abf325...@syzkaller.appspotmail.com

Bluetooth: hci4: command 0x041b tx timeout
Bluetooth: hci4: command 0x040f tx timeout
Bluetooth: hci4: command 0x0419 tx timeout
bond15 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 15889 at net/core/dev.c:8216 rollback_registered_many.cold+0x171/0x18f net/core/dev.c:8216
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 15889 Comm: kworker/u4:8 Not tainted 4.19.211-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+0x1fc/0x2ef lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
__warn.cold+0x20/0x5a kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:183
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:rollback_registered_many.cold+0x171/0x18f net/core/dev.c:8216
Code: fe e8 95 d6 50 f9 48 c7 c7 c0 85 4c 89 e8 f4 07 e2 ff 0f 0b e9 2b fb 65 fe e8 7d d6 50 f9 48 c7 c7 c0 85 4c 89 e8 dc 07 e2 ff <0f> 0b e9 81 f9 65 fe 48 89 c7 48 89 44 24 08 e8 1d b6 86 f9 48 8b
RSP: 0018:ffff88809912f988 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff8880a2e2ce40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1013225f23
RBP: ffff88809912fb60 R08: 0000000000000024 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000005128ee01 R14: ffffffff843ffad0 R15: ffff88809912fa50
unregister_netdevice_many.part.0+0x1a/0x300 net/core/dev.c:9324
unregister_netdevice_many net/core/dev.c:9323 [inline]
default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:9795
ops_exit_list+0xf9/0x150 net/core/net_namespace.c:156
cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:554
process_one_work+0x864/0x1570 kernel/workqueue.c:2153
worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y

console output: https://syzkaller.appspot.com/x/log.txt?x=15075f85f00000

kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=abf325737b513ff77aa7
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14cdd495f00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+abf325...@syzkaller.appspotmail.com

bond0 (unregistering): Releasing backup interface bond36
bond36 (unregistering): Released all slaves
bond35 (unregistering): Released all slaves
bond34 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8102 at net/core/dev.c:8216 rollback_registered_many.cold+0x171/0x18f net/core/dev.c:8216

Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8102 Comm: kworker/u4:0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/12/2022

Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
__warn.cold+0x20/0x5a kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:183
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:rollback_registered_many.cold+0x171/0x18f net/core/dev.c:8216
Code: fe e8 95 d6 50 f9 48 c7 c7 c0 85 4c 89 e8 f4 07 e2 ff 0f 0b e9 2b fb 65 fe e8 7d d6 50 f9 48 c7 c7 c0 85 4c 89 e8 dc 07 e2 ff <0f> 0b e9 81 f9 65 fe 48 89 c7 48 89 44 24 08 e8 1d b6 86 f9 48 8b

RSP: 0018:ffff8880b317f988 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff888085b88c80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed101662ff23
RBP: ffff8880b317fb60 R08: 0000000000000024 R09: 0000000000000000

R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000

R13: 00000000abbe9901 R14: ffffffff843ffad0 R15: ffff8880b317fa50