Oops: general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.16.0-syzkaller-06619-gd942fe13f72b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ip6_route_output_flags_noref net/ipv6/route.c:2682 [inline] RIP: 0010:ip6_route_output_flags+0x336/0x5d0 net/ipv6/route.c:2696 Code: 90 80 99 f7 83 cd 04 4c 8b 2c 24 eb 35 e8 82 80 99 f7 45 31 f6 48 bb 00 00 00 00 00 fc ff df 49 83 c6 4e 4c 89 f0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 27 02 00 00 41 0f b6 06 c1 e0 03 83 e0 38 RSP: 0018:ffffc900001472d8 EFLAGS: 00010207 RAX: 0000000000000009 RBX: dffffc0000000000 RCX: ffff88801d2abc00 RDX: 0000000000000100 RSI: 0000000000000080 RDI: 0000000000000000 RBP: 0000000000000081 R08: ffff88801d2abc00 R09: 0000000000000002 R10: 000000000000c0fe R11: 0000000000000100 R12: ffff888057dacb18 R13: ffff88807d5e4880 R14: 000000000000004e R15: ffffc900001475a0 FS: 0000000000000000(0000) GS:ffff888125c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000017000 CR3: 00000000550f4000 CR4: 00000000003526f0 Call Trace: ip6_route_output include/net/ip6_route.h:93 [inline] ip6_dst_lookup_tail+0x1ae/0x1510 net/ipv6/ip6_output.c:1131 ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1262 tipc_udp_xmit+0x30f/0xaa0 net/tipc/udp_media.c:210 tipc_udp_send_msg+0x27f/0x3f0 net/tipc/udp_media.c:271 tipc_bearer_xmit_skb+0x2b0/0x400 net/tipc/bearer.c:575 tipc_disc_timeout+0x580/0x6d0 net/tipc/discover.c:338 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x283/0x870 kernel/softirq.c:579 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ip6_route_output_flags_noref net/ipv6/route.c:2682 [inline] RIP: 0010:ip6_route_output_flags+0x336/0x5d0 net/ipv6/route.c:2696 Code: 90 80 99 f7 83 cd 04 4c 8b 2c 24 eb 35 e8 82 80 99 f7 45 31 f6 48 bb 00 00 00 00 00 fc ff df 49 83 c6 4e 4c 89 f0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 27 02 00 00 41 0f b6 06 c1 e0 03 83 e0 38 RSP: 0018:ffffc900001472d8 EFLAGS: 00010207 RAX: 0000000000000009 RBX: dffffc0000000000 RCX: ffff88801d2abc00 RDX: 0000000000000100 RSI: 0000000000000080 RDI: 0000000000000000 RBP: 0000000000000081 R08: ffff88801d2abc00 R09: 0000000000000002 R10: 000000000000c0fe R11: 0000000000000100 R12: ffff888057dacb18 R13: ffff88807d5e4880 R14: 000000000000004e R15: ffffc900001475a0 FS: 0000000000000000(0000) GS:ffff888125c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000017000 CR3: 00000000550f4000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 80 99 f7 83 cd 04 4c sbbb $0x4c,0x4cd83f7(%rcx) 8: 8b 2c 24 mov (%rsp),%ebp b: eb 35 jmp 0x42 d: e8 82 80 99 f7 call 0xf7998094 12: 45 31 f6 xor %r14d,%r14d 15: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx 1c: fc ff df 1f: 49 83 c6 4e add $0x4e,%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 27 02 00 00 jne 0x25d 36: 41 0f b6 06 movzbl (%r14),%eax 3a: c1 e0 03 shl $0x3,%eax 3d: 83 e0 38 and $0x38,%eax