------------[ cut here ]------------
WARNING: CPU: 0 PID: 8327 at net/ipv4/route.c:1274 kfree_skb include/linux/skbuff.h:1220 [inline]
WARNING: CPU: 0 PID: 8327 at net/ipv4/route.c:1274 ip_rt_bug+0x25/0xf0 net/ipv4/route.c:1273
Modules linked in:
CPU: 0 PID: 8327 Comm: syz-executor Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:ip_rt_bug+0x25/0xf0 net/ipv4/route.c:1274
Code: 41 ff ff ff 90 41 57 41 56 41 55 41 54 53 48 89 d3 e8 af 74 eb f8 66 90 e8 a8 74 eb f8 48 89 df be 01 00 00 00 e8 9b b1 7e ff <0f> 0b 31 c0 5b 41 5c 41 5d 41 5e 41 5f c3 49 bd 00 00 00 00 00 fc
RSP: 0018:ffffc90000007638 EFLAGS: 00010292
RAX: 0fadc9e1be9aed00 RBX: ffff88805f935780 RCX: 0fadc9e1be9aed00
RDX: dffffc0000000000 RSI: ffffffff8a6bfe00 RDI: ffffffff8abf0da0
RBP: ffff88804b533100 R08: dffffc0000000000 R09: fffffbfff211705b
R10: fffffbfff211705b R11: 1ffffffff211705a R12: ffff88804b533130
R13: ffff88805f9357d8 R14: ffff88805f935780 R15: ffff888144ee8d00
FS:  0000555559bb0500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff6af4aecc6 CR3: 000000005e893000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 dst_output include/net/dst.h:453 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb+0x129/0x1c0 net/ipv4/ip_output.c:1599
 __icmp_send+0xfbb/0x1320 net/ipv4/icmp.c:785
 ipv4_send_dest_unreach net/ipv4/route.c:1254 [inline]
 ipv4_link_failure+0x65c/0xa10 net/ipv4/route.c:1261
 dst_link_failure include/net/dst.h:423 [inline]
 arp_error_report+0x10e/0x160 net/ipv4/arp.c:296
 neigh_invalidate+0x22c/0x450 net/core/neighbour.c:1059
 neigh_timer_handler+0x911/0x1080 net/core/neighbour.c:1146
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:661
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:filter_irq_stacks+0x25/0x90 kernel/stacktrace.c:395
Code: 00 00 00 00 00 41 57 41 56 41 55 41 54 53 85 f6 74 70 49 89 fe 41 89 f4 31 db 49 bd 00 00 00 00 00 fc ff df 49 89 ff 4c 89 f8 <48> c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 c8 91 62 00 49 8b 04
RSP: 0018:ffffc900034e71c8 EFLAGS: 00000206
RAX: ffffc900034e72a8 RBX: 0000000000000009 RCX: 0000000000000801
RDX: 0000000000000001 RSI: 000000000000000c RDI: ffffc900034e7260
RBP: ffffc900034e7490 R08: 0000000000000001 R09: fffffbfff1bfd046
R10: fffffbfff1bfd046 R11: 1ffffffff1bfd045 R12: 000000000000000c
R13: dffffc0000000000 R14: ffffc900034e7260 R15: ffffc900034e72a8
 __stack_depot_save+0x35/0x460 lib/stackdepot.c:439
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x60/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750
 slab_free mm/slub.c:3661 [inline]
 kmem_cache_free+0xf7/0x290 mm/slub.c:3683
 mas_destroy+0x24ac/0x2c60 lib/maple_tree.c:5862
 dup_mmap kernel/fork.c:708 [inline]
 dup_mm kernel/fork.c:1541 [inline]
 copy_mm+0xf62/0x15c0 kernel/fork.c:1590
 copy_process+0x1947/0x4060 kernel/fork.c:2266
 kernel_clone+0x225/0x8b0 kernel/fork.c:2681
 __do_sys_clone kernel/fork.c:2822 [inline]
 __se_sys_clone kernel/fork.c:2806 [inline]
 __x64_sys_clone+0x17c/0x1d0 kernel/fork.c:2806
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f906a3851d3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffca597ff68 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f906a3851d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000555559bb07d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000005f148 R15: 00007ffca5980100
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 41 57             	add    %al,0x57(%rcx)
   7:	41 56                	push   %r14
   9:	41 55                	push   %r13
   b:	41 54                	push   %r12
   d:	53                   	push   %rbx
   e:	85 f6                	test   %esi,%esi
  10:	74 70                	je     0x82
  12:	49 89 fe             	mov    %rdi,%r14
  15:	41 89 f4             	mov    %esi,%r12d
  18:	31 db                	xor    %ebx,%ebx
  1a:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  21:	fc ff df
  24:	49 89 ff             	mov    %rdi,%r15
  27:	4c 89 f8             	mov    %r15,%rax
* 2a:	48 c1 e8 03          	shr    $0x3,%rax <-- trapping instruction
  2e:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  33:	74 08                	je     0x3d
  35:	4c 89 ff             	mov    %r15,%rdi
  38:	e8 c8 91 62 00       	call   0x629205
  3d:	49                   	rex.WB
  3e:	8b                   	.byte 0x8b
  3f:	04                   	.byte 0x4