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WARNING: net/core/skbuff.c:7243 at skb_attempt_defer_free+0x538/0x674 net/core/skbuff.c:7243, CPU#0: syz.6.670/9069
Modules linked in:
CPU: 0 UID: 0 PID: 9069 Comm: syz.6.670 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : skb_attempt_defer_free+0x538/0x674 net/core/skbuff.c:7243
lr : skb_attempt_defer_free+0x538/0x674 net/core/skbuff.c:7243
sp : ffff8000a5be7660
x29: ffff8000a5be76c0 x28: ffff700014b7cef8 x27: 0000000000000089
x26: ffff8000a5be7660 x25: 1ffff00014b7cecc x24: dfff800000000000
x23: 1fffe0001ea6fb73 x22: 0000000000000000 x21: ffff0000f537dba0
x20: 0000000000000001 x19: ffff0000f537db40 x18: 0000000000000000
x17: ffff80010c42d000 x16: ffff80008aeffdc0 x15: 0000000000000001
x14: 1fffe0001ea6fb84 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 00000000000006d3 x9 : ffff8000a4349000
x8 : 00000000000006d4 x7 : 0000004d42232428 x6 : 00000000200005c9
x5 : 00000000200005c9 x4 : 0000000000000006 x3 : ffff800089ab4dd4
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000002
Call trace:
 skb_attempt_defer_free+0x538/0x674 net/core/skbuff.c:7243 (P)
 skb_consume_udp+0x98/0x250 net/ipv4/udp.c:1854
 udp_recvmsg+0xea8/0x13bc net/ipv4/udp.c:2145
 sk_udp_recvmsg net/ipv4/udp_bpf.c:-1 [inline]
 udp_bpf_recvmsg+0xa84/0xca4 net/ipv4/udp_bpf.c:-1
 inet_recvmsg+0x110/0x1b8 net/ipv4/af_inet.c:891
 sock_recvmsg_nosec net/socket.c:1078 [inline]
 sock_recvmsg net/socket.c:1100 [inline]
 __sys_recvfrom+0x250/0x3a0 net/socket.c:2256
 __do_sys_recvfrom net/socket.c:2271 [inline]
 __se_sys_recvfrom net/socket.c:2267 [inline]
 __arm64_sys_recvfrom+0xd8/0xf8 net/socket.c:2267
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 842
hardirqs last  enabled at (841): [<ffff8000803e0320>] __local_bh_enable_ip+0x1ec/0x35c kernel/softirq.c:455
hardirqs last disabled at (842): [<ffff80008af93820>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:412
softirqs last  enabled at (840): [<ffff800089ab5740>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (840): [<ffff800089ab5740>] __skb_recv_udp+0x3d4/0x7c8 net/ipv4/udp.c:2000
softirqs last disabled at (838): [<ffff800089ab5538>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (838): [<ffff800089ab5538>] __skb_recv_udp+0x1cc/0x7c8 net/ipv4/udp.c:1972
---[ end trace 0000000000000000 ]---