Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 10789 Comm: syz.0.1609 Not tainted 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:nft_fib6_eval+0x838/0xd70 net/ipv6/netfilter/nft_fib_ipv6.c:206 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 19 05 00 00 48 8b ab d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 04 00 00 48 8b 6d 00 4d 85 ff 74 5f e8 f0 d8 RSP: 0018:ffffc90003a271e8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880799d63c0 RCX: ffffc90004e62000 RDX: 0000000000000000 RSI: ffffffff8a4642ae RDI: ffff8880799d6498 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000001000 R13: ffffc90003a27268 R14: ffffc90003a27649 R15: 0000000000000000 FS: 00007f5a89b416c0(0000) GS:ffff888124853000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f117ff8 CR3: 000000005ed38000 CR4: 00000000003526f0 DR0: 0000000000000040 DR1: 0000000000000004 DR2: 0000000000000003 DR3: 00000000000010e3 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nft_fib_inet_eval+0x19a/0x230 net/netfilter/nft_fib_inet.c:34 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] nft_do_chain+0x2e6/0x1920 net/netfilter/nf_tables_core.c:285 nft_do_chain_inet+0x18a/0x340 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn include/linux/netfilter.h:157 [inline] nf_hook_slow+0xbb/0x200 net/netfilter/core.c:623 nf_hook.constprop.0+0x422/0x750 include/linux/netfilter.h:272 NF_HOOK include/linux/netfilter.h:315 [inline] ip6_input+0xe0/0x2f0 net/ipv6/ip6_input.c:491 dst_input include/net/dst.h:469 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] NF_HOOK include/linux/netfilter.h:311 [inline] ipv6_rcv+0x265/0x680 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core+0x12d/0x1e0 net/core/dev.c:5977 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6090 netif_receive_skb_internal net/core/dev.c:6176 [inline] netif_receive_skb+0x137/0x7b0 net/core/dev.c:6235 tun_rx_batched.isra.0+0x3ee/0x740 drivers/net/tun.c:1509 tun_get_user+0x28a2/0x3b80 drivers/net/tun.c:1938 tun_chr_write_iter+0xdc/0x210 drivers/net/tun.c:1984 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x6c4/0x1150 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5a88d8d3df 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:00007f5a89b41000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f5a88fb5fa0 RCX: 00007f5a88d8d3df RDX: 000000000000004e RSI: 0000200000000780 RDI: 00000000000000c8 RBP: 00007f5a88e10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000004e R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5a88fb5fa0 R15: 00007fff2055f538 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nft_fib6_eval+0x838/0xd70 net/ipv6/netfilter/nft_fib_ipv6.c:206 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 19 05 00 00 48 8b ab d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 ea 04 00 00 48 8b 6d 00 4d 85 ff 74 5f e8 f0 d8 RSP: 0018:ffffc90003a271e8 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8880799d63c0 RCX: ffffc90004e62000 RDX: 0000000000000000 RSI: ffffffff8a4642ae RDI: ffff8880799d6498 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000001000 R13: ffffc90003a27268 R14: ffffc90003a27649 R15: 0000000000000000 FS: 00007f5a89b416c0(0000) GS:ffff888124853000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f117ff8 CR3: 000000005ed38000 CR4: 00000000003526f0 DR0: 0000000000000040 DR1: 0000000000000004 DR2: 0000000000000003 DR3: 00000000000010e3 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: df 48 89 fisttps -0x77(%rax) 3: fa cli 4: 48 c1 ea 03 shr $0x3,%rdx 8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) c: 0f 85 19 05 00 00 jne 0x52b 12: 48 8b ab d8 00 00 00 mov 0xd8(%rbx),%rbp 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 ea mov %rbp,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 ea 04 00 00 jne 0x51e 34: 48 8b 6d 00 mov 0x0(%rbp),%rbp 38: 4d 85 ff test %r15,%r15 3b: 74 5f je 0x9c 3d: e8 .byte 0xe8 3e: f0 lock 3f: d8 .byte 0xd8