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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1624:b0:659:9a49:90ac with SMTP id 006d021491bc7-65f54f7a4f7mr1813923eaf.43.1767854274203; Wed, 07 Jan 2026 22:37:54 -0800 (PST) Date: Wed, 07 Jan 2026 22:37:54 -0800 In-Reply-To: <20260107125423.4031241-1-edumazet@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <695f50c2.050a0220.1c677c.038a.GAE@google.com> Subject: [syzbot ci] Re: net: update netdev_lock_{type,name} From: syzbot ci To: davem@davemloft.net, edumazet@google.com, eric.dumazet@gmail.com, horms@kernel.org, kuba@kernel.org, netdev@vger.kernel.org, pabeni@redhat.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" 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: 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 ---------------- 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@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.