------------[ cut here ]------------ WARNING: CPU: 1 PID: 20554 at net/ipv6/route.c:4803 rt6_multipath_rebalance+0x455/0x8b0 net/ipv6/route.c:4803 Modules linked in: CPU: 1 UID: 0 PID: 20554 Comm: syz.3.3950 Not tainted 6.15.0-rc4-syzkaller-00178-g9540984da649 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 RIP: 0010:rt6_multipath_rebalance+0x455/0x8b0 net/ipv6/route.c:4803 Code: ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 85 fe ff ff 4c 89 e7 e8 8d 53 13 f8 e9 78 fe ff ff e8 13 5f b1 f7 eb 05 e8 0c 5f b1 f7 90 <0f> 0b 90 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc RSP: 0018:ffffc90003a764a0 EFLAGS: 00010287 RAX: ffffffff8a0e613d RBX: ffff8880336ab800 RCX: 0000000000080000 RDX: ffffc9001c58c000 RSI: 000000000003fc16 RDI: 000000000003fc17 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200074ec8c R12: ffff88805851c8ce R13: ffff8880336ab890 R14: 0000000000000000 R15: 1ffff110066d5712 FS: 00007fb4b8ca96c0(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c27a05f CR3: 000000007eac0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fib6_ifdown+0x401/0x4c0 net/ipv6/route.c:4923 fib6_clean_node+0x24a/0x590 net/ipv6/ip6_fib.c:2199 fib6_walk_continue+0x678/0x910 net/ipv6/ip6_fib.c:2124 fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2172 fib6_clean_tree net/ipv6/ip6_fib.c:2252 [inline] __fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2268 rt6_sync_down_dev net/ipv6/route.c:4951 [inline] rt6_disable_ip+0x120/0x720 net/ipv6/route.c:4956 addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3857 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9422 do_setlink+0xcb9/0x40d0 net/core/rtnetlink.c:3152 rtnl_group_changelink net/core/rtnetlink.c:3783 [inline] __rtnl_newlink net/core/rtnetlink.c:3937 [inline] rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4065 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb4b7d8e969 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:00007fb4b8ca9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb4b7fb5fa0 RCX: 00007fb4b7d8e969 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000006 RBP: 00007fb4b7e10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb4b7fb5fa0 R15: 00007ffe2f574648