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: 13653 Comm: syz.6.4696 Tainted: G W 5.10.238-syzkaller-00316-gd0d90e085c21 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline] RIP: 0010:fib_lookup_good_nhc net/ipv4/fib_trie.c:1363 [inline] RIP: 0010:nexthop_get_nhc_lookup+0x1a2/0x6c0 include/net/nexthop.h:291 Code: 74 08 48 89 df e8 ee 0c c1 fd 48 89 5d a8 48 8b 1b b8 d8 02 00 00 48 01 c3 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 c0 0c c1 fd 48 8b 1b 48 85 db 74 68 RSP: 0018:ffffc90000170408 EFLAGS: 00010202 RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000 RDX: ffff8881171362c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000170478 R08: ffff8881171362c0 R09: 0000000000000003 R10: 0000000000000008 R11: 0000000080000300 R12: ffff888115701700 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888110873910 FS: 000055556a594500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd199aa36c0 CR3: 00000001096e9000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fib_table_lookup+0xe4c/0x1730 net/ipv4/fib_trie.c:1542 fib4_rule_action+0x115/0x1a0 net/ipv4/fib_rules.c:135 fib_rules_lookup+0x489/0x8d0 net/core/fib_rules.c:318 __fib_lookup+0xe4/0x150 net/ipv4/fib_rules.c:92 fib_lookup include/net/ip_fib.h:371 [inline] ip_route_output_key_hash_rcu+0x329/0x2060 net/ipv4/route.c:2671 ip_route_output_key_hash net/ipv4/route.c:2561 [inline] __ip_route_output_key include/net/route.h:126 [inline] ip_route_output_flow+0x123/0x2d0 net/ipv4/route.c:2793 ip_route_output_key include/net/route.h:142 [inline] tipc_udp_xmit+0x1aa/0x8e0 net/tipc/udp_media.c:183 tipc_udp_send_msg+0x20c/0x2e0 net/tipc/udp_media.c:265 tipc_bearer_xmit_skb+0x27d/0x360 net/tipc/bearer.c:548 tipc_disc_timeout+0x6a2/0x830 net/tipc/discover.c:337 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450 expire_timers kernel/time/timer.c:1495 [inline] __run_timers+0x639/0x9a0 kernel/time/timer.c:1789 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1802 __do_softirq+0x255/0x563 kernel/softirq.c:309 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:405 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:freezer_count include/linux/freezer.h:134 [inline] RIP: 0010:freezable_schedule include/linux/freezer.h:198 [inline] RIP: 0010:futex_wait_queue_me+0x29b/0x530 kernel/futex/core.c:2621 Code: 24 49 89 de 49 c1 ee 03 49 bf 00 00 00 00 00 fc ff df 43 0f b6 04 3e 84 c0 0f 85 32 01 00 00 81 0b 00 00 00 40 e8 c5 53 1c 03 <43> 0f b6 04 3e 84 c0 4d 89 fe 0f 85 34 01 00 00 80 63 03 bf f0 83 RSP: 0018:ffffc90000ed7980 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8881171362e4 RCX: ffffffff84753e73 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881171362c0 RBP: ffffc90000ed7a50 R08: dffffc0000000000 R09: ffffed1022e26c59 R10: ffffed1022e26c59 R11: 1ffff11022e26c58 R12: ffff8881171362d0 R13: ffff8881171362c0 R14: 1ffff11022e26c5c R15: dffffc0000000000 futex_wait+0x210/0x680 kernel/futex/core.c:2723 do_futex+0xf3d/0x1210 kernel/futex/core.c:3757 __do_sys_futex kernel/futex/core.c:3820 [inline] __se_sys_futex+0x2b4/0x360 kernel/futex/core.c:3786 __x64_sys_futex+0xe5/0x100 kernel/futex/core.c:3786 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa6d6792929 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:00007ffd03eb7008 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00000000000a1a81 RCX: 00007fa6d6792929 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa6d69b9fac RBP: 0000000000000032 R08: 0007cab90793a64c R09: 0000000103eb72ff R10: 00007ffd03eb7100 R11: 0000000000000246 R12: 00007fa6d69b9fac R13: 00007ffd03eb7100 R14: 00000000000a1ab3 R15: 00007ffd03eb7120 Modules linked in: ---[ end trace ec009c501b2140a2 ]--- RIP: 0010:ip_ignore_linkdown include/linux/inetdevice.h:254 [inline] RIP: 0010:fib_lookup_good_nhc net/ipv4/fib_trie.c:1363 [inline] RIP: 0010:nexthop_get_nhc_lookup+0x1a2/0x6c0 include/net/nexthop.h:291 Code: 74 08 48 89 df e8 ee 0c c1 fd 48 89 5d a8 48 8b 1b b8 d8 02 00 00 48 01 c3 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 c0 0c c1 fd 48 8b 1b 48 85 db 74 68 RSP: 0018:ffffc90000170408 EFLAGS: 00010202 RAX: 000000000000005b RBX: 00000000000002d8 RCX: dffffc0000000000 RDX: ffff8881171362c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000170478 R08: ffff8881171362c0 R09: 0000000000000003 R10: 0000000000000008 R11: 0000000080000300 R12: ffff888115701700 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888110873910 FS: 000055556a594500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd199aa36c0 CR3: 00000001096e9000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 74 08 je 0xa 2: 48 89 df mov %rbx,%rdi 5: e8 ee 0c c1 fd call 0xfdc10cf8 a: 48 89 5d a8 mov %rbx,-0x58(%rbp) e: 48 8b 1b mov (%rbx),%rbx 11: b8 d8 02 00 00 mov $0x2d8,%eax 16: 48 01 c3 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 c0 0c c1 fd call 0xfdc10cf8 38: 48 8b 1b mov (%rbx),%rbx 3b: 48 85 db test %rbx,%rbx 3e: 74 68 je 0xa8