------------[ cut here ]------------ WARNING: net/ipv4/route.c:1275 at kfree_skb_reason include/linux/skbuff.h:1322 [inline], CPU#0: syz.0.17/4880 WARNING: net/ipv4/route.c:1275 at kfree_skb include/linux/skbuff.h:1331 [inline], CPU#0: syz.0.17/4880 WARNING: net/ipv4/route.c:1275 at ip_rt_bug+0x34/0x120 net/ipv4/route.c:1274, CPU#0: syz.0.17/4880 Modules linked in: CPU: 0 UID: 0 PID: 4880 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : ip_rt_bug+0x34/0x120 include/linux/skbuff.h:1322 lr : kfree_skb_reason include/linux/skbuff.h:1322 [inline] lr : kfree_skb include/linux/skbuff.h:1331 [inline] lr : ip_rt_bug+0x34/0x120 net/ipv4/route.c:1274 sp : ffff80009a476de0 x29: ffff80009a476de0 x28: 1ffff0001348ee04 x27: ffff0000d29ee640 x26: dfff800000000000 x25: 1fffe0001a53dcd3 x24: dfff800000000000 x23: ffff0000ce888d00 x22: ffff0000ce888d30 x21: ffff0000d7b70000 x20: ffff0000c3503480 x19: ffff0000d29ee640 x18: 00000000ffffffff x17: ffff80008a0cdc80 x16: ffff80008a3e3a78 x15: ffff800080c519a0 x14: ffff800080c5182c x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a343d08 x10: 0000000000000003 x9 : 373eef874390ba00 x8 : 373eef874390ba00 x7 : 0000000000000000 x6 : ffff800080164950 x5 : ffff0000db862d70 x4 : 0000000000000008 x3 : ffff800080153db0 x2 : 0000000000000002 x1 : ffff0000cf6e0000 x0 : 0000000000000001 Call trace: kfree_skb_reason include/linux/skbuff.h:1322 [inline] (P) kfree_skb include/linux/skbuff.h:1331 [inline] (P) ip_rt_bug+0x34/0x120 net/ipv4/route.c:1274 (P) dst_output include/net/dst.h:470 [inline] ip_local_out+0x110/0x148 net/ipv4/ip_output.c:131 ip_send_skb+0x50/0x1a8 net/ipv4/ip_output.c:1508 ip_push_pending_frames+0x6c/0x88 net/ipv4/ip_output.c:1528 icmp_push_reply+0x2e0/0x3bc net/ipv4/icmp.c:408 __icmp_send+0xe1c/0x11dc net/ipv4/icmp.c:1000 icmp_send include/net/icmp.h:43 [inline] ip_options_compile+0x80/0xbc net/ipv4/ip_options.c:473 ip_rcv_options net/ipv4/ip_input.c:290 [inline] ip_rcv_finish_core+0x910/0x1888 net/ipv4/ip_input.c:430 ip_rcv_finish+0x12c/0x230 net/ipv4/ip_input.c:490 NF_HOOK+0x2dc/0x36c include/linux/netfilter.h:318 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:612 __netif_receive_skb_one_core+0xc4/0x10c net/core/dev.c:6202 __netif_receive_skb+0x34/0x128 net/core/dev.c:6315 netif_receive_skb_internal net/core/dev.c:6401 [inline] netif_receive_skb+0x1c8/0xaac net/core/dev.c:6460 tun_rx_batched+0x48c/0x5dc drivers/net/tun.c:-1 tun_get_user+0x2274/0x34f0 drivers/net/tun.c:1955 tun_chr_write_iter+0xfc/0x168 drivers/net/tun.c:2001 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x52c/0xa14 fs/read_write.c:688 ksys_write+0x12c/0x224 fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:748 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 irq event stamp: 1405 hardirqs last enabled at (1404): [] kasan_quarantine_put+0xb4/0x1c4 mm/kasan/quarantine.c:234 hardirqs last disabled at (1405): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:412 softirqs last enabled at (1250): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1252): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---