------------[ cut here ]------------
WARNING: CPU: 0 PID: 12254 at net/ipv4/route.c:1241 ip_rt_bug+0x2c/0x110 net/ipv4/route.c:1241
Modules linked in:
CPU: 0 UID: 0 PID: 12254 Comm: syz.5.1644 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:ip_rt_bug+0x2c/0x110 net/ipv4/route.c:1241
Code: 1e fa 41 57 41 56 41 55 41 54 53 48 89 d3 e8 3b 3e 7c f7 66 90 e8 34 3e 7c f7 31 ff 48 89 de ba 02 00 00 00 e8 95 b4 6a ff 90 <0f> 0b 90 31 c0 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc f3 0f 1e
RSP: 0018:ffffc90000007680 EFLAGS: 00010286
RAX: 531c7ae071949500 RBX: ffff88802fdb33c0 RCX: ffffffff8170bf9a
RDX: dffffc0000000000 RSI: ffffffff8c0acac0 RDI: ffffffff8c6035a0
RBP: 0000000000000001 R08: ffffffff9429789f R09: ffffffff8a189bdb
R10: dffffc0000000000 R11: fffffbfff2852f14 R12: dffffc0000000000
R13: ffffc900000078f8 R14: ffff888012149d80 R15: ffff88801bbf9b00
FS:  00007f09d9ce86c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09d9127e18 CR3: 000000002fa0e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 ip_send_skb net/ipv4/ip_output.c:1496 [inline]
 ip_push_pending_frames+0xbf/0x150 net/ipv4/ip_output.c:1516
 __icmp_send+0x1017/0x15c0 net/ipv4/icmp.c:780
 ipv4_send_dest_unreach net/ipv4/route.c:1221 [inline]
 ipv4_link_failure+0x62f/0xa10 net/ipv4/route.c:1228
 dst_link_failure include/net/dst.h:429 [inline]
 arp_error_report+0x114/0x160 net/ipv4/arp.c:296
 neigh_invalidate+0x244/0x470 net/core/neighbour.c:1061
 neigh_timer_handler+0x8a5/0xfe0 net/core/neighbour.c:1148
 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1794
 expire_timers kernel/time/timer.c:1845 [inline]
 __run_timers kernel/time/timer.c:2419 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2430
 run_timer_base kernel/time/timer.c:2439 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0xa4/0x120 kernel/kcov.c:351
Code: 8b 00 00 00 4c 8b 4c 24 20 65 4c 8b 1c 25 80 d7 03 00 31 d2 eb 08 48 ff c2 49 39 d2 74 71 4c 8b 74 d6 10 65 8b 05 64 f7 6e 7e <25> 00 01 ff 00 74 11 3d 00 01 00 00 75 de 41 83 bb 1c 16 00 00 00
RSP: 0018:ffffc9000e3b7170 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 000000000000096f RCX: 0000000000040000
RDX: 0000000000000001 RSI: ffffffff8e9f1200 RDI: ffffea000045e240
RBP: ffffc9000e3b7378 R08: 0000000000000007 R09: ffffffff81cdf509
R10: 0000000000000002 R11: ffff888021713c00 R12: ffffc9000e3b7360
R13: ffffc9000e3b7360 R14: 0000000000000406 R15: 1ffff92001c76e6f
 xas_retry include/linux/xarray.h:1528 [inline]
 next_uptodate_folio+0x69/0xa40 mm/filemap.c:3499
 filemap_map_pages+0x2f3/0x20d0 mm/filemap.c:3645
 do_fault_around mm/memory.c:5255 [inline]
 do_read_fault mm/memory.c:5288 [inline]
 do_fault mm/memory.c:5431 [inline]
 do_pte_missing mm/memory.c:3965 [inline]
 handle_pte_fault+0x2b98/0x6820 mm/memory.c:5766
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6077
 faultin_page mm/gup.c:1187 [inline]
 __get_user_pages+0x1c82/0x49e0 mm/gup.c:1485
 populate_vma_page_range+0x264/0x330 mm/gup.c:1923
 __mm_populate+0x27a/0x460 mm/gup.c:2026
 mm_populate include/linux/mm.h:3371 [inline]
 vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09d8f7e719
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:00007f09d9ce8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f09d9135f80 RCX: 00007f09d8f7e719
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f09d8ff139e R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f09d9135f80 R15: 00007ffdee9a09f8
 </TASK>
----------------
Code disassembly (best guess):
   0:	8b 00                	mov    (%rax),%eax
   2:	00 00                	add    %al,(%rax)
   4:	4c 8b 4c 24 20       	mov    0x20(%rsp),%r9
   9:	65 4c 8b 1c 25 80 d7 	mov    %gs:0x3d780,%r11
  10:	03 00
  12:	31 d2                	xor    %edx,%edx
  14:	eb 08                	jmp    0x1e
  16:	48 ff c2             	inc    %rdx
  19:	49 39 d2             	cmp    %rdx,%r10
  1c:	74 71                	je     0x8f
  1e:	4c 8b 74 d6 10       	mov    0x10(%rsi,%rdx,8),%r14
  23:	65 8b 05 64 f7 6e 7e 	mov    %gs:0x7e6ef764(%rip),%eax        # 0x7e6ef78e
* 2a:	25 00 01 ff 00       	and    $0xff0100,%eax <-- trapping instruction
  2f:	74 11                	je     0x42
  31:	3d 00 01 00 00       	cmp    $0x100,%eax
  36:	75 de                	jne    0x16
  38:	41 83 bb 1c 16 00 00 	cmpl   $0x0,0x161c(%r11)
  3f:	00