Re: [syzbot] [net?] WARNING in trace_event_raw_event_icmp_send

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    68f892e99df9 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=10735625580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3
dashboard link: https://syzkaller.appspot.com/bug?extid=6d2762674103618994b0
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
userspace arch: arm64
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=104dd579580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6d2762674103618994b0@xxxxxxxxxxxxxxxxxxxxxxxxx

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WARNING: ./include/linux/skbuff.h:3087 at skb_transport_header include/linux/skbuff.h:3087 [inline], CPU#1: syz-executor414/5032
WARNING: ./include/linux/skbuff.h:3087 at udp_hdr include/linux/udp.h:23 [inline], CPU#1: syz-executor414/5032
WARNING: ./include/linux/skbuff.h:3087 at do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline], CPU#1: syz-executor414/5032
WARNING: ./include/linux/skbuff.h:3087 at trace_event_raw_event_icmp_send+0x48c/0x6ec include/trace/events/icmp.h:11, CPU#1: syz-executor414/5032
Modules linked in:
CPU: 1 UID: 0 PID: 5032 Comm: syz-executor414 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : skb_transport_header include/linux/skbuff.h:3087 [inline]
pc : udp_hdr include/linux/udp.h:23 [inline]
pc : do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline]
pc : trace_event_raw_event_icmp_send+0x48c/0x6ec include/trace/events/icmp.h:11
lr : skb_transport_header include/linux/skbuff.h:3087 [inline]
lr : udp_hdr include/linux/udp.h:23 [inline]
lr : do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline]
lr : trace_event_raw_event_icmp_send+0x48c/0x6ec include/trace/events/icmp.h:11
sp : ffff8000985f6d60
x29: ffff8000985f6e40 x28: ffff0000da5d0340 x27: ffff0000dec03d36
x26: 000000000000ffff x25: ffff7000130bedb4 x24: 000000000000ffff
x23: 0000000000000030 x22: 1fffe0001bd807a6 x21: ffff0000dec03c80
x20: ffff0000c1afa014 x19: ffff0000d477d7c8 x18: 0000000000000000
x17: ffff80008a7d6000 x16: 0000000000000004 x15: ffff800084be8404
x14: ffff800084be8240 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 000000000000007f x9 : 0000000000000400
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff800085503d58
x2 : 000000000000ffff x1 : ffff0000d477d7c0 x0 : 0000000000000000
Call trace:
 skb_transport_header include/linux/skbuff.h:3087 [inline] (P)
 udp_hdr include/linux/udp.h:23 [inline] (P)
 do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline] (P)
 trace_event_raw_event_icmp_send+0x48c/0x6ec include/trace/events/icmp.h:11 (P)
 __traceiter_icmp_send include/trace/events/icmp.h:11 [inline]
 __do_trace_icmp_send include/trace/events/icmp.h:11 [inline]
 trace_icmp_send+0x320/0x49c include/trace/events/icmp.h:11
 __icmp_send+0xcfc/0x11d8 net/ipv4/icmp.c:1013
 ipv4_send_dest_unreach net/ipv4/route.c:1280 [inline]
 ipv4_link_failure+0x57c/0x8dc net/ipv4/route.c:1287
 dst_link_failure include/net/dst.h:438 [inline]
 vti_xmit net/ipv4/ip_vti.c:271 [inline]
 vti_tunnel_xmit+0xe40/0x17a4 net/ipv4/ip_vti.c:307
 __netdev_start_xmit include/linux/netdevice.h:5397 [inline]
 netdev_start_xmit include/linux/netdevice.h:5406 [inline]
 xmit_one net/core/dev.c:3889 [inline]
 dev_hard_start_xmit+0x1dc/0x9d4 net/core/dev.c:3905
 __dev_queue_xmit+0xed4/0x2bc0 net/core/dev.c:4878
 dev_queue_xmit include/linux/netdevice.h:3448 [inline]
 packet_xmit+0x6c/0x314 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3107 [inline]
 packet_sendmsg+0x2f40/0x3e78 net/packet/af_packet.c:3139
 sock_sendmsg_nosec net/socket.c:775 [inline]
 __sock_sendmsg+0xc8/0x17c net/socket.c:790
 __sys_sendto+0x250/0x328 net/socket.c:2252
 __do_sys_sendto net/socket.c:2259 [inline]
 __se_sys_sendto net/socket.c:2255 [inline]
 __arm64_sys_sendto+0xec/0x10c net/socket.c:2255
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
irq event stamp: 12633
hardirqs last  enabled at (12632): [<ffff8000804e3a00>] __call_rcu_common kernel/rcu/tree.c:3184 [inline]
hardirqs last  enabled at (12632): [<ffff8000804e3a00>] call_rcu+0x460/0x75c kernel/rcu/tree.c:3279
hardirqs last disabled at (12633): [<ffff80008690cc28>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445
softirqs last  enabled at (12592): [<ffff800084c0e4cc>] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698
softirqs last disabled at (12598): [<ffff800084c7a6c0>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (12598): [<ffff800084c7a6c0>] rcu_read_lock_bh include/linux/rcupdate.h:893 [inline]
softirqs last disabled at (12598): [<ffff800084c7a6c0>] __dev_queue_xmit+0x1fc/0x2bc0 net/core/dev.c:4796
---[ end trace 0000000000000000 ]---


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