------------[ cut here ]------------
WARNING: CPU: 1 PID: 10110 at net/ipv4/route.c:1274 kfree_skb include/linux/skbuff.h:1220 [inline]
WARNING: CPU: 1 PID: 10110 at net/ipv4/route.c:1274 ip_rt_bug+0x25/0xf0 net/ipv4/route.c:1273
Modules linked in:
CPU: 1 PID: 10110 Comm: kworker/u4:55 Not tainted 6.1.137-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: netns cleanup_net
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 2f 81 eb f8 66 90 e8 28 81 eb f8 48 89 df be 01 00 00 00 e8 bb 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:ffffc900001e0638 EFLAGS: 00010292
RAX: 2fdebf85f6f55500 RBX: ffff88802f69c3c0 RCX: 2fdebf85f6f55500
RDX: dffffc0000000000 RSI: ffffffff8a6bfe00 RDI: ffffffff8abf0da0
RBP: ffff888079277d00 R08: dffffc0000000000 R09: fffffbfff211705b
R10: fffffbfff211705b R11: 1ffffffff211705a R12: ffff888079277d30
R13: ffff88802f69c418 R14: ffff88802f69c3c0 R15: ffff888144289380
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07fff9cd58 CR3: 00000000607f9000 CR4: 00000000003506e0
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:lockdep_unregister_key+0x4c3/0x530 kernel/locking/lockdep.c:6370
Code: 81 86 90 48 c7 c6 80 7d 63 81 e8 88 93 07 00 e8 d3 a6 07 00 e9 86 fc ff ff e8 09 94 ab 08 41 f7 c4 00 02 00 00 74 d1 fb 84 db <75> d0 eb e1 0f 0b eb a1 0f 0b e9 11 ff ff ff 0f 0b e9 5e ff ff ff
RSP: 0018:ffffc90004ea7740 EFLAGS: 00000246
RAX: 2fdebf85f6f55500 RBX: 0000000000000000 RCX: 2fdebf85f6f55500
RDX: 0000000000000001 RSI: ffffffff8a6c0ae0 RDI: ffffffff8abf0da0
RBP: ffffc90004ea7820 R08: dffffc0000000000 R09: fffffbfff210d436
R10: fffffbfff210d436 R11: 1ffffffff210d435 R12: 0000000000000206
R13: ffff888029827299 R14: ffffffff90868198 R15: 1ffff920009d4eec
 __qdisc_destroy+0x128/0x430 net/sched/sch_generic.c:1078
 netdev_for_each_tx_queue include/linux/netdevice.h:2465 [inline]
 dev_shutdown+0x92/0x440 net/sched/sch_generic.c:1489
 unregister_netdevice_many+0xa32/0x1840 net/core/dev.c:10969
 default_device_exit_batch+0x9c3/0xa50 net/core/dev.c:11491
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x77b/0xb80 net/core/net_namespace.c:640
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	81 86 90 48 c7 c6 80 	addl   $0x81637d80,-0x3938b770(%rsi)
   7:	7d 63 81
   a:	e8 88 93 07 00       	call   0x79397
   f:	e8 d3 a6 07 00       	call   0x7a6e7
  14:	e9 86 fc ff ff       	jmp    0xfffffc9f
  19:	e8 09 94 ab 08       	call   0x8ab9427
  1e:	41 f7 c4 00 02 00 00 	test   $0x200,%r12d
  25:	74 d1                	je     0xfffffff8
  27:	fb                   	sti
  28:	84 db                	test   %bl,%bl
* 2a:	75 d0                	jne    0xfffffffc <-- trapping instruction
  2c:	eb e1                	jmp    0xf
  2e:	0f 0b                	ud2
  30:	eb a1                	jmp    0xffffffd3
  32:	0f 0b                	ud2
  34:	e9 11 ff ff ff       	jmp    0xffffff4a
  39:	0f 0b                	ud2
  3b:	e9 5e ff ff ff       	jmp    0xffffff9e