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Message-ID: <695f50c2.050a0220.1c677c.038a.GAE@google.com>
Date: Wed, 07 Jan 2026 22:37:54 -0800
From: syzbot ci <syzbot+ci131adae482253910@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, eric.dumazet@...il.com,
horms@...nel.org, kuba@...nel.org, netdev@...r.kernel.org, pabeni@...hat.com
Cc: syzbot@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot ci] Re: net: update netdev_lock_{type,name}
syzbot ci has tested the following series
[v2] net: update netdev_lock_{type,name}
https://lore.kernel.org/all/20260107125423.4031241-1-edumazet@google.com
* [PATCH v2 net] net: update netdev_lock_{type,name}
and found the following issue:
WARNING in register_netdevice
Full report is available here:
https://ci.syzbot.org/series/07a2abd3-8dbc-43d0-a5d9-cdbb1a35d769
***
WARNING in register_netdevice
tree: net
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git
base: 1806d210e5a8f431ad4711766ae4a333d407d972
arch: amd64
compiler: Debian clang version 21.1.8 (++20251202083448+f68f64eb8130-1~exp1~20251202083504.46), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/f4fb7576-ea1f-485d-9ef1-c3270f1560d9/config
C repro: https://ci.syzbot.org/findings/e4767ea9-6be5-4bce-9523-40ab12d29b67/c_repro
syz repro: https://ci.syzbot.org/findings/e4767ea9-6be5-4bce-9523-40ab12d29b67/syz_repro
------------[ cut here ]------------
netdev_lock_pos() could not find dev_type=805
WARNING: net/core/dev.c:529 at netdev_lock_pos net/core/dev.c:529 [inline], CPU#0: syz.0.17/5972
WARNING: net/core/dev.c:529 at netdev_set_addr_lockdep_class net/core/dev.c:547 [inline], CPU#0: syz.0.17/5972
WARNING: net/core/dev.c:529 at register_netdevice+0x7f9/0x1ba0 net/core/dev.c:11318, CPU#0: syz.0.17/5972
Modules linked in:
CPU: 0 UID: 0 PID: 5972 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:netdev_lock_pos net/core/dev.c:529 [inline]
RIP: 0010:netdev_set_addr_lockdep_class net/core/dev.c:547 [inline]
RIP: 0010:register_netdevice+0x7fc/0x1ba0 net/core/dev.c:11318
Code: ca 56 db f8 48 c7 03 00 00 00 00 41 bd f4 ff ff ff 4c 8b 64 24 28 e9 8f f9 ff ff e8 4e 59 74 f8 48 8d 3d 27 79 82 06 44 89 e6 <67> 48 0f b9 3a 41 bc 40 00 00 00 49 bf 00 00 00 00 00 fc ff df 4c
RSP: 0018:ffffc9000768ef20 EFLAGS: 00010293
RAX: ffffffff894e19b2 RBX: fffffffffffffff8 RCX: ffff8881063c57c0
RDX: 0000000000000000 RSI: 0000000000000325 RDI: ffffffff8fd092e0
RBP: ffffc9000768f090 R08: 0000000000000003 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10218fd9d4 R12: 0000000000000325
R13: ffffffff8c902318 R14: 000000000000fffe R15: 0000000000000040
FS: 000055556284f500(0000) GS:ffff88818e40f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4739c706c0 CR3: 00000001bdb86000 CR4: 00000000000006f0
Call Trace:
<TASK>
ieee802154_if_add+0xb39/0x1050 net/mac802154/iface.c:667
ieee802154_add_iface_deprecated+0x43/0x70 net/mac802154/cfg.c:26
rdev_add_virtual_intf_deprecated net/ieee802154/rdev-ops.h:16 [inline]
ieee802154_add_iface+0x472/0x860 net/ieee802154/nl-phy.c:218
genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x61c/0x7a0 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg+0x21c/0x270 net/socket.c:742
____sys_sendmsg+0x4d7/0x810 net/socket.c:2592
___sys_sendmsg+0x2a5/0x360 net/socket.c:2646
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2683 [inline]
__se_sys_sendmsg net/socket.c:2681 [inline]
__x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4739d9acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd43a0e968 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f473a005fa0 RCX: 00007f4739d9acb9
RDX: 0000000020048000 RSI: 00002000000009c0 RDI: 0000000000000004
RBP: 00007f4739e08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f473a005fac R14: 00007f473a005fa0 R15: 00007f473a005fa0
</TASK>
----------------
Code disassembly (best guess):
0: ca 56 db lret $0xdb56
3: f8 clc
4: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
b: 41 bd f4 ff ff ff mov $0xfffffff4,%r13d
11: 4c 8b 64 24 28 mov 0x28(%rsp),%r12
16: e9 8f f9 ff ff jmp 0xfffff9aa
1b: e8 4e 59 74 f8 call 0xf874596e
20: 48 8d 3d 27 79 82 06 lea 0x6827927(%rip),%rdi # 0x682794e
27: 44 89 e6 mov %r12d,%esi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 41 bc 40 00 00 00 mov $0x40,%r12d
35: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
3c: fc ff df
3f: 4c rex.WR
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@...kaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@...glegroups.com.
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