Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 UID: 0 PID: 12918 Comm: syz.2.1822 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:nft_fib6_eval+0x7cd/0xc20 net/ipv6/netfilter/nft_fib_ipv6.c:-1 Code: 4c 89 f3 48 81 c3 d8 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 3d a2 dc f7 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 24 a2 dc f7 48 8b 3b 48 8b 5c 24 RSP: 0018:ffffc9001a996dc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff8880553a1e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9001a996f90 R08: ffffffff8fa38c37 R09: 1ffffffff1f47186 R10: dffffc0000000000 R11: fffffbfff1f47187 R12: dffffc0000000000 R13: ffffc9001a996eb0 R14: ffff888057f47500 R15: ffff888057f47560 FS: 00007f538b44b6c0(0000) GS:ffff888125c13000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c372a8e CR3: 000000002701c000 CR4: 00000000003526f0 Call Trace: expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] nft_do_chain+0x40c/0x1920 net/netfilter/nf_tables_core.c:285 nft_do_chain_inet+0x25d/0x340 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x206/0x3a0 include/linux/netfilter.h:316 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500 ip6_mc_input+0x655/0xb70 net/ipv6/ip6_input.c:590 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6040 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6153 netif_receive_skb_internal net/core/dev.c:6239 [inline] netif_receive_skb+0x1cb/0x790 net/core/dev.c:6298 tun_rx_batched+0x1b9/0x730 drivers/net/tun.c:1485 tun_get_user+0x2aa2/0x3e20 drivers/net/tun.c:1950 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1996 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 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: 0033:0x7f538a58d65f 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:00007f538b44b000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f538a7d6090 RCX: 00007f538a58d65f RDX: 0000000000000066 RSI: 00002000000002c0 RDI: 00000000000000c8 RBP: 00007f538a611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000066 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f538a7d6128 R14: 00007f538a7d6090 R15: 00007ffcb2647dd8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nft_fib6_eval+0x7cd/0xc20 net/ipv6/netfilter/nft_fib_ipv6.c:-1 Code: 4c 89 f3 48 81 c3 d8 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 3d a2 dc f7 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 24 a2 dc f7 48 8b 3b 48 8b 5c 24 RSP: 0018:ffffc9001a996dc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff8880553a1e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9001a996f90 R08: ffffffff8fa38c37 R09: 1ffffffff1f47186 R10: dffffc0000000000 R11: fffffbfff1f47187 R12: dffffc0000000000 R13: ffffc9001a996eb0 R14: ffff888057f47500 R15: ffff888057f47560 FS: 00007f538b44b6c0(0000) GS:ffff888125c13000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c372a8e CR3: 000000002701c000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 4c 89 f3 mov %r14,%rbx 3: 48 81 c3 d8 00 00 00 add $0xd8,%rbx a: 48 89 d8 mov %rbx,%rax d: 48 c1 e8 03 shr $0x3,%rax 11: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 3d a2 dc f7 call 0xf7dca25d 20: 48 8b 1b mov (%rbx),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 24 a2 dc f7 call 0xf7dca25d 39: 48 8b 3b mov (%rbx),%rdi 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 5c pop %rsp 3f: 24 .byte 0x24