EXT4-fs (loop8): mounted filesystem without journal. Quota mode: none. general protection fault, probably for non-canonical address 0xdffffc000000005b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000002d8-0x00000000000002df] CPU: 1 PID: 15043 Comm: syz.8.3977 Not tainted 6.1.145-syzkaller-00002-gc750dc582629 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__in6_dev_get include/net/addrconf.h:355 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:446 [inline] RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:781 Code: 7c 05 00 00 74 08 48 89 df e8 b5 41 60 fd 48 89 d8 bb d8 02 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8b 41 60 fd 48 8b 1b 48 85 db 0f 84 RSP: 0018:ffffc900021fe8e0 EFLAGS: 00010202 RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000 RDX: ffff888112965100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900021fe998 R08: ffffc900021fecc0 R09: ffffc900021fecd0 R10: 0000000000000000 R11: 1ffff9200043fdba R12: 0000000000000201 R13: 1ffff1102627c544 R14: 0000000000000000 R15: 0000000000000003 FS: 00007f665b6906c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30615ff8 CR3: 000000011b6a5000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rt6_nh_find_match+0xd9/0x140 net/ipv6/route.c:821 nexthop_for_each_fib6_nh+0x107/0x200 net/ipv4/nexthop.c:1243 __find_rr_leaf+0x50f/0x900 net/ipv6/route.c:862 find_rr_leaf net/ipv6/route.c:890 [inline] rt6_select net/ipv6/route.c:934 [inline] fib6_table_lookup+0x2c1/0x9a0 net/ipv6/route.c:2223 ip6_pol_route+0x14c/0x1110 net/ipv6/route.c:2259 ip6_pol_route_output+0x51/0x80 net/ipv6/route.c:2634 pol_lookup_func include/net/ip6_fib.h:589 [inline] fib6_rule_lookup+0x311/0x580 net/ipv6/fib6_rules.c:121 ip6_route_output_flags_noref+0x283/0x340 net/ipv6/route.c:2666 ip6_route_output_flags+0x3c/0x200 net/ipv6/route.c:2679 ip6_route_output include/net/ip6_route.h:98 [inline] ip6_update_pmtu+0x1d8/0x300 net/ipv6/route.c:2981 icmpv6_err+0x124/0x270 net/ipv6/icmp.c:82 icmpv6_notify+0x30b/0x5d0 net/ipv6/icmp.c:856 icmpv6_rcv+0x103c/0x1ad0 net/ipv6/icmp.c:-1 ip6_protocol_deliver_rcu+0xaf7/0x1510 net/ipv6/ip6_input.c:438 ip6_input_finish net/ipv6/ip6_input.c:483 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip6_input+0x1be/0x370 net/ipv6/ip6_input.c:492 ip6_mc_input+0x386/0x690 net/ipv6/ip6_input.c:586 dst_input include/net/dst.h:463 [inline] ip6_rcv_finish+0x19e/0x370 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:305 [inline] ipv6_rcv+0xe9/0x210 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5585 [inline] __netif_receive_skb+0xd7/0x2a0 net/core/dev.c:5699 netif_receive_skb_internal net/core/dev.c:5785 [inline] netif_receive_skb+0x98/0x3d0 net/core/dev.c:5844 tun_rx_batched+0x1b6/0x770 drivers/net/tun.c:1548 tun_get_user+0x2494/0x3320 drivers/net/tun.c:1998 tun_chr_write_iter+0x1fb/0x300 drivers/net/tun.c:2044 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5db/0xca0 fs/read_write.c:584 ksys_write+0x140/0x240 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f665a78d69f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007f665b690000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f665a9b5fa0 RCX: 00007f665a78d69f RDX: 000000000000006e RSI: 0000200000000140 RDI: 00000000000000c8 RBP: 00007f665a811e19 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000006e R11: 0000000000000293 R12: 0000000000000000 R13: 00007f665a9b6038 R14: 00007f665a9b5fa0 R15: 00007ffff85a2978 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__in6_dev_get include/net/addrconf.h:355 [inline] RIP: 0010:ip6_ignore_linkdown include/net/addrconf.h:446 [inline] RIP: 0010:find_match+0xb7/0xf20 net/ipv6/route.c:781 Code: 7c 05 00 00 74 08 48 89 df e8 b5 41 60 fd 48 89 d8 bb d8 02 00 00 48 03 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8b 41 60 fd 48 8b 1b 48 85 db 0f 84 RSP: 0018:ffffc900021fe8e0 EFLAGS: 00010202 RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000 RDX: ffff888112965100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900021fe998 R08: ffffc900021fecc0 R09: ffffc900021fecd0 R10: 0000000000000000 R11: 1ffff9200043fdba R12: 0000000000000201 R13: 1ffff1102627c544 R14: 0000000000000000 R15: 0000000000000003 FS: 00007f665b6906c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30615ff8 CR3: 000000011b6a5000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 7c 05 jl 0x7 2: 00 00 add %al,(%rax) 4: 74 08 je 0xe 6: 48 89 df mov %rbx,%rdi 9: e8 b5 41 60 fd call 0xfd6041c3 e: 48 89 d8 mov %rbx,%rax 11: bb d8 02 00 00 mov $0x2d8,%ebx 16: 48 03 18 add (%rax),%rbx 19: 48 89 d8 mov %rbx,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 8b 41 60 fd call 0xfd6041c3 38: 48 8b 1b mov (%rbx),%rbx 3b: 48 85 db test %rbx,%rbx 3e: 0f .byte 0xf 3f: 84 .byte 0x84