------------[ cut here ]------------
WARNING: CPU: 0 PID: 8890 at net/ipv4/route.c:1254 ip_rt_bug+0x2c/0x110 net/ipv4/route.c:1254
Modules linked in:
CPU: 0 UID: 0 PID: 8890 Comm: syz.0.995 Not tainted 6.12.0-rc7-syzkaller-01702-gd7ef9eeef072 #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:1254
Code: 1e fa 41 57 41 56 41 55 41 54 53 48 89 d3 e8 6b 61 72 f7 66 90 e8 64 61 72 f7 31 ff 48 89 de ba 02 00 00 00 e8 b5 44 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: 76035606479b6100 RBX: ffff88805f7d3640 RCX: ffffffff8170cfaa
RDX: dffffc0000000000 RSI: ffffffff8c0acac0 RDI: ffffffff8c610de0
RBP: 0000000000000001 R08: ffffffff942e589f R09: ffffffff8a2288bb
R10: dffffc0000000000 R11: fffffbfff285cb14 R12: dffffc0000000000
R13: ffffc900000078f8 R14: ffff888066adbc80 R15: ffff888144ea1b00
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c39327d CR3: 0000000066afe000 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:1505 [inline]
 ip_push_pending_frames+0xbf/0x150 net/ipv4/ip_output.c:1525
 __icmp_send+0x1013/0x15c0 net/ipv4/icmp.c:779
 ipv4_send_dest_unreach net/ipv4/route.c:1234 [inline]
 ipv4_link_failure+0x62f/0xa10 net/ipv4/route.c:1241
 dst_link_failure include/net/dst.h:429 [inline]
 arp_error_report+0x114/0x160 net/ipv4/arp.c:296
 neigh_invalidate+0x247/0x470 net/core/neighbour.c:1010
 neigh_timer_handler+0x8a5/0xfe0 net/core/neighbour.c:1097
 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:__nr_to_section include/linux/mmzone.h:1881 [inline]
RIP: 0010:__pfn_to_section include/linux/mmzone.h:1989 [inline]
RIP: 0010:lookup_page_ext mm/page_ext.c:251 [inline]
RIP: 0010:page_ext_get+0x11c/0x2a0 mm/page_ext.c:526
Code: 87 91 01 00 00 48 c7 c0 a0 b8 44 9a 48 c1 e8 03 42 80 3c 38 00 74 0c 48 c7 c7 a0 b8 44 9a e8 fb 25 f3 ff 48 8b 05 e4 19 39 18 <48> 85 c0 74 41 4c 89 e1 48 c1 e9 16 48 8d 1c c8 48 89 d8 48 c1 e8
RSP: 0018:ffffc90002df7510 EFLAGS: 00000246
RAX: ffff88823ffef540 RBX: 0000000001fc0e80 RCX: ffff888061d0bc00
RDX: 0000000000000000 RSI: 0000000001fc0e80 RDI: 000000ffffffffc0
RBP: 000000ffffffffc0 R08: ffffffff820b9e8e R09: 1ffffffff285cb00
R10: dffffc0000000000 R11: fffffbfff285cb01 R12: 000000000007f03a
R13: 1ffff11004bbc944 R14: ffffffff820b9dc0 R15: dffffc0000000000
 page_table_check_clear+0x4b/0x550 mm/page_table_check.c:74
 get_and_clear_full_ptes include/linux/pgtable.h:684 [inline]
 zap_present_folio_ptes mm/memory.c:1496 [inline]
 zap_present_ptes mm/memory.c:1579 [inline]
 zap_pte_range mm/memory.c:1621 [inline]
 zap_pmd_range mm/memory.c:1739 [inline]
 zap_pud_range mm/memory.c:1768 [inline]
 zap_p4d_range mm/memory.c:1789 [inline]
 unmap_page_range+0x2a13/0x40e0 mm/memory.c:1810
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1900
 exit_mmap+0x275/0xc40 mm/mmap.c:1923
 __mmput+0x115/0x390 kernel/fork.c:1348
 exit_mm+0x220/0x310 kernel/exit.c:571
 do_exit+0x9b2/0x28e0 kernel/exit.c:926
 do_group_exit+0x207/0x2c0 kernel/exit.c:1088
 __do_sys_exit_group kernel/exit.c:1099 [inline]
 __se_sys_exit_group kernel/exit.c:1097 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097
 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f2c2477e759
Code: Unable to access opcode bytes at 0x7f2c2477e72f.
RSP: 002b:00007fff92cc08f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2c2477e759
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff92cc094c R08: 00007fff92cc09df R09: 000000000006a0ec
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000032
R13: 000000000006a0ec R14: 000000000006a07f R15: 00007fff92cc09a0
 </TASK>
----------------
Code disassembly (best guess):
   0:	87 91 01 00 00 48    	xchg   %edx,0x48000001(%rcx)
   6:	c7 c0 a0 b8 44 9a    	mov    $0x9a44b8a0,%eax
   c:	48 c1 e8 03          	shr    $0x3,%rax
  10:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  15:	74 0c                	je     0x23
  17:	48 c7 c7 a0 b8 44 9a 	mov    $0xffffffff9a44b8a0,%rdi
  1e:	e8 fb 25 f3 ff       	call   0xfff3261e
  23:	48 8b 05 e4 19 39 18 	mov    0x183919e4(%rip),%rax        # 0x18391a0e
* 2a:	48 85 c0             	test   %rax,%rax <-- trapping instruction
  2d:	74 41                	je     0x70
  2f:	4c 89 e1             	mov    %r12,%rcx
  32:	48 c1 e9 16          	shr    $0x16,%rcx
  36:	48 8d 1c c8          	lea    (%rax,%rcx,8),%rbx
  3a:	48 89 d8             	mov    %rbx,%rax
  3d:	48                   	rex.W
  3e:	c1                   	.byte 0xc1
  3f:	e8                   	.byte 0xe8