lo: entered allmulticast mode Oops: general protection fault, probably for non-canonical address 0xdffffc0000000012: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000090-0x0000000000000097] CPU: 1 UID: 0 PID: 8049 Comm: syz.7.514 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__fib6_drop_pcpu_from+0x1f0/0x3b0 net/ipv6/ip6_fib.c:993 Code: 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 ef e8 97 aa ef f7 49 8b 6d 00 48 85 ed 74 2f 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 71 aa ef f7 48 8b 45 00 48 3b 44 RSP: 0018:ffffc900040ae1b0 EFLAGS: 00010217 RAX: 0000000000000012 RBX: ffffffff8dbe1d10 RCX: ffff88805468bc00 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000094 R08: 0000000000000000 R09: ffffffff8a337456 R10: dffffc0000000000 R11: fffffbfff1f473e7 R12: 0000000000000000 R13: ffffe8ffff80e5c0 R14: dffffc0000000000 R15: ffff8880529c3d20 FS: 00007fd1b018f6c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33d14ff8 CR3: 000000004241d000 CR4: 0000000000350ef0 Call Trace: fib6_drop_pcpu_from net/ipv6/ip6_fib.c:1027 [inline] fib6_purge_rt+0x10b/0x910 net/ipv6/ip6_fib.c:1038 fib6_del_route net/ipv6/ip6_fib.c:2042 [inline] fib6_del+0xee1/0x1550 net/ipv6/ip6_fib.c:2087 fib6_clean_node+0x29f/0x590 net/ipv6/ip6_fib.c:2249 fib6_walk_continue+0x67b/0x910 net/ipv6/ip6_fib.c:2171 fib6_walk+0x149/0x290 net/ipv6/ip6_fib.c:2219 fib6_clean_tree net/ipv6/ip6_fib.c:2299 [inline] __fib6_clean_all+0x234/0x380 net/ipv6/ip6_fib.c:2315 rt6_sync_down_dev net/ipv6/route.c:5005 [inline] rt6_disable_ip+0x120/0x720 net/ipv6/route.c:5010 addrconf_ifdown+0x15d/0x1880 net/ipv6/addrconf.c:3853 addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9617 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3143 rtnl_group_changelink net/core/rtnetlink.c:3775 [inline] __rtnl_newlink net/core/rtnetlink.c:3929 [inline] rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd1af38ebe9 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:00007fd1b018f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd1af5c5fa0 RCX: 00007fd1af38ebe9 RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000000008 RBP: 00007fd1af411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd1af5c6038 R14: 00007fd1af5c5fa0 R15: 00007ffcb55cd2f8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__fib6_drop_pcpu_from+0x1f0/0x3b0 net/ipv6/ip6_fib.c:993 Code: 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 ef e8 97 aa ef f7 49 8b 6d 00 48 85 ed 74 2f 48 81 c5 90 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 ef e8 71 aa ef f7 48 8b 45 00 48 3b 44 RSP: 0018:ffffc900040ae1b0 EFLAGS: 00010217 RAX: 0000000000000012 RBX: ffffffff8dbe1d10 RCX: ffff88805468bc00 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000094 R08: 0000000000000000 R09: ffffffff8a337456 R10: dffffc0000000000 R11: fffffbfff1f473e7 R12: 0000000000000000 R13: ffffe8ffff80e5c0 R14: dffffc0000000000 R15: ffff8880529c3d20 FS: 00007fd1b018f6c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33d14ff8 CR3: 000000004241d000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 9: 74 08 je 0x13 b: 4c 89 ef mov %r13,%rdi e: e8 97 aa ef f7 call 0xf7efaaaa 13: 49 8b 6d 00 mov 0x0(%r13),%rbp 17: 48 85 ed test %rbp,%rbp 1a: 74 2f je 0x4b 1c: 48 81 c5 90 00 00 00 add $0x90,%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 71 aa ef f7 call 0xf7efaaaa 39: 48 8b 45 00 mov 0x0(%rbp),%rax 3d: 48 rex.W 3e: 3b .byte 0x3b 3f: 44 rex.R