------------[ cut here ]------------
WARNING: CPU: 1 PID: 28440 at net/ipv4/route.c:1246 kfree_skb include/linux/skbuff.h:1114 [inline]
WARNING: CPU: 1 PID: 28440 at net/ipv4/route.c:1246 ip_rt_bug+0x24/0x130 net/ipv4/route.c:1245
Modules linked in:
CPU: 1 PID: 28440 Comm: kworker/u4:2 Not tainted 5.17.0-rc1-syzkaller-00210-g6449520391df #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:ip_rt_bug+0x24/0x130 net/ipv4/route.c:1246
Code: 01 0f 1f 44 00 00 55 48 89 d5 53 48 83 ec 08 e8 72 48 ce f9 66 90 e8 6b 48 ce f9 e8 66 48 ce f9 31 f6 48 89 ef e8 3c d4 7d ff <0f> 0b 48 83 c4 08 31 c0 5b 5d c3 e8 4c 48 ce f9 48 8d 7d 10 48 b8
RSP: 0018:ffffc90000dc08a8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888073a79a80 RCX: 0000000000000100
RDX: ffff88802850ba00 RSI: ffffffff87aa14f4 RDI: 0000000000000000
RBP: ffff88807a169500 R08: 0000000000000000 R09: ffffffff8ffbd9d7
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880282b4e00
R13: ffff88807a169500 R14: 0000000000000000 R15: ffff88807a169558
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e021000 CR3: 0000000052081000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb net/ipv4/ip_output.c:1570 [inline]
 ip_push_pending_frames+0x125/0x2b0 net/ipv4/ip_output.c:1590
 icmp_push_reply+0x351/0x4a0 net/ipv4/icmp.c:393
 __icmp_send+0xb99/0x13d0 net/ipv4/icmp.c:769
 ipv4_send_dest_unreach net/ipv4/route.c:1226 [inline]
 ipv4_link_failure+0x5d5/0x9f0 net/ipv4/route.c:1233
 dst_link_failure include/net/dst.h:430 [inline]
 arp_error_report+0xc7/0x1c0 net/ipv4/arp.c:295
 neigh_invalidate+0x20d/0x560 net/core/neighbour.c:1024
 neigh_timer_handler+0xd47/0x10e0 net/core/neighbour.c:1111
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:200
Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 70 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 a4 15 00 00 85 c0 74 2b 8b 82 80 15 00 00 <83> f8 02 75 20 48 8b 8a 88 15 00 00 8b 92 84 15 00 00 48 8b 01 48
RSP: 0018:ffffc90004837b48 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000000007ffff RCX: 0000000000000000
RDX: ffff88802850ba00 RSI: ffffffff87afdb37 RDI: ffff88802850be3c
RBP: 0000000000039a39 R08: 000000000007ffff R09: 0000000000000000
R10: ffffffff87afdf77 R11: 0000000000000000 R12: ffffffff8d6081a0
R13: ffffc90004837cb0 R14: 0000000000000002 R15: dffffc0000000000
 rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
 rcu_read_lock include/linux/rcupdate.h:694 [inline]
 inet_twsk_purge+0xf7/0x7d0 net/ipv4/inet_timewait_sock.c:268
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:173
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:597
 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
 worker_thread+0x657/0x1110 kernel/workqueue.c:2454
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	81 e1 00 01 00 00    	and    $0x100,%ecx
   6:	65 48 8b 14 25 00 70 	mov    %gs:0x27000,%rdx
   d:	02 00
   f:	a9 00 01 ff 00       	test   $0xff0100,%eax
  14:	74 0e                	je     0x24
  16:	85 c9                	test   %ecx,%ecx
  18:	74 35                	je     0x4f
  1a:	8b 82 a4 15 00 00    	mov    0x15a4(%rdx),%eax
  20:	85 c0                	test   %eax,%eax
  22:	74 2b                	je     0x4f
  24:	8b 82 80 15 00 00    	mov    0x1580(%rdx),%eax
* 2a:	83 f8 02             	cmp    $0x2,%eax <-- trapping instruction
  2d:	75 20                	jne    0x4f
  2f:	48 8b 8a 88 15 00 00 	mov    0x1588(%rdx),%rcx
  36:	8b 92 84 15 00 00    	mov    0x1584(%rdx),%edx
  3c:	48 8b 01             	mov    (%rcx),%rax
  3f:	48                   	rex.W