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Date:   Wed, 19 Aug 2020 08:04:25 -0700
From:   syzbot <>
Subject: WARNING in rtnl_dellink


syzbot found the following issue on:

HEAD commit:    4ca0d9ac bonding: show saner speed for broadcast mode
git tree:       net
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:
C reproducer:

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:
final oops:
console output:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

bond1 (unregistering): Released all slaves
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7280 at net/core/dev.c:9304 rollback_registered_many+0xecd/0x1210 net/core/dev.c:9304
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 7280 Comm: syz-executor543 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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+0x20/0x4a kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:rollback_registered_many+0xecd/0x1210 net/core/dev.c:9304
Code: 0a 1b 00 00 48 c7 c6 40 d7 fe 88 48 c7 c7 80 d7 fe 88 c6 05 b6 e1 71 04 01 e8 71 18 0a fb 0f 0b e9 13 fc ff ff e8 d3 14 39 fb <0f> 0b e9 ea fb ff ff e8 c7 14 39 fb 0f 0b e9 29 fc ff ff e8 3b 25
RSP: 0018:ffffc90002df7290 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000a650bd01 RCX: ffffffff863b3396
RDX: ffff8880874fc540 RSI: ffffffff863b37ad RDI: 0000000000000001
RBP: ffff8880a5edef80 R08: 0000000000000000 R09: ffffffff8a7e4067
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880925b0000 R14: dffffc0000000000 R15: ffff8880a5edef80
 unregister_netdevice_many.part.0+0x1a/0x2f0 net/core/dev.c:10426
 unregister_netdevice_many+0x36/0x50 net/core/dev.c:10425
 rtnl_delete_link net/core/rtnetlink.c:3055 [inline]
 rtnl_dellink+0x34a/0xa60 net/core/rtnetlink.c:3107
 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5563
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2470
 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
RIP: 0033:0x44b1a9
Code: e8 9c 14 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 4b 05 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8155c28d98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000006e7a58 RCX: 000000000044b1a9
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000009
RBP: 00000000006e7a50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e7a5c
R13: 0000000000000000 R14: 0000000000000000 R15: 068500100000003c
Kernel Offset: disabled
Rebooting in 86400 seconds..

This report is generated by a bot. It may contain errors.
See for more information about syzbot.
syzbot engineers can be reached at

syzbot will keep track of this issue. See: for how to communicate with syzbot.
For information about bisection process see:
syzbot can test patches for this issue, for details see:

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