------------[ cut here ]------------ WARNING: CPU: 0 PID: 5943 at ./include/net/netdev_lock.h:17 netdev_assert_locked include/net/netdev_lock.h:17 [inline] WARNING: CPU: 0 PID: 5943 at ./include/net/netdev_lock.h:17 netdev_nl_dev_fill+0x6bc/0x860 net/core/netdev-genl.c:41 Modules linked in: CPU: 0 UID: 0 PID: 5943 Comm: syz.1.9 Not tainted 6.15.0-rc2-syzkaller-00563-g240ce924d271 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:netdev_assert_locked include/net/netdev_lock.h:17 [inline] RIP: 0010:netdev_nl_dev_fill+0x6bc/0x860 net/core/netdev-genl.c:41 Code: 1c 24 44 29 eb 4c 89 e8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 4a 01 00 00 41 89 5d 00 31 c0 e9 4d fe ff ff e8 65 4e c4 f7 90 <0f> 0b 90 e9 2c fa ff ff e8 57 4e c4 f7 90 0f 0b 90 42 80 3c 3b 00 RSP: 0018:ffffc9000462f680 EFLAGS: 00010283 RAX: ffffffff89fe6c5b RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc9000c6ca000 RSI: 00000000000380d8 RDI: 00000000000380d9 RBP: ffffc9000462f7b0 R08: ffffffff89fe667c R09: 1ffff1100606e5dc R10: dffffc0000000000 R11: ffffed100606e5dd R12: ffff88802d446000 R13: ffff88802a4e2280 R14: ffff88802a4e2280 R15: ffffc9000462f800 FS: 00007f86764d56c0(0000) GS:ffff888124fab000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000032930000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: netdev_genl_dev_notify+0x1fb/0x450 net/core/netdev-genl.c:102 netdev_genl_netdevice_event+0x81/0xa0 net/core/netdev-genl.c:-1 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2266 [inline] call_netdevice_notifiers net/core/dev.c:2280 [inline] register_netdevice+0x16c0/0x1b80 net/core/dev.c:11102 register_netdev+0x40/0x50 net/core/dev.c:11180 vti6_init_net+0x23c/0x380 net/ipv6/ip6_vti.c:1158 ops_init+0x349/0x5b0 net/core/net_namespace.c:138 setup_net+0x222/0x540 net/core/net_namespace.c:440 copy_net_ns+0x33f/0x570 net/core/net_namespace.c:572 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228 ksys_unshare+0x5e2/0xad0 kernel/fork.c:3375 __do_sys_unshare kernel/fork.c:3446 [inline] __se_sys_unshare kernel/fork.c:3444 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:3444 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f867558e169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f86764d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f86757b5fa0 RCX: 00007f867558e169 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000062040200 RBP: 00007f8675610a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f86757b5fa0 R15: 00007ffdcef77068