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BUG: KMSAN: uninit-value in __skb_checksum_complete+0x371/0x480 net/core/skbuff.c:3774
 __skb_checksum_complete+0x371/0x480 net/core/skbuff.c:3774
 __skb_checksum_validate_complete include/linux/skbuff.h:4857 [inline]
 icmp_rcv+0xbfa/0x2450 net/ipv4/icmp.c:1429
 ip_protocol_deliver_rcu+0xb25/0x13c0 net/ipv4/ip_input.c:207
 ip_local_deliver_finish+0x409/0x720 net/ipv4/ip_input.c:241
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_local_deliver+0x228/0x4a0 net/ipv4/ip_input.c:262
 dst_input include/net/dst.h:474 [inline]
 ip_rcv_finish+0x4f7/0x5b0 net/ipv4/ip_input.c:453
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip_rcv+0xcb/0x370 net/ipv4/ip_input.c:573
 __netif_receive_skb_one_core net/core/dev.c:6152 [inline]
 __netif_receive_skb net/core/dev.c:6265 [inline]
 process_backlog+0x8d7/0x1500 net/core/dev.c:6617
 __napi_poll+0xdc/0x8f0 net/core/dev.c:7681
 napi_poll net/core/dev.c:7744 [inline]
 net_rx_action+0xa5b/0x1c70 net/core/dev.c:7896
 handle_softirqs+0x168/0x6f0 kernel/softirq.c:622
 run_ksoftirqd+0x29/0x50 kernel/softirq.c:1063
 smpboot_thread_fn+0x56b/0xa10 kernel/smpboot.c:160
 kthread+0xd5a/0xf00 kernel/kthread.c:463
 ret_from_fork+0x207/0x6f0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

Uninit was stored to memory at:
 csum_partial_copy_nocheck include/net/checksum.h:53 [inline]
 skb_copy_and_csum_bits+0x844/0x1580 net/core/skbuff.c:3618
 icmp_glue_bits+0x8e/0x2f0 net/ipv4/icmp.c:359
 __ip_append_data+0x60ed/0x7030 net/ipv4/ip_output.c:1172
 ip_append_data+0x144/0x220 net/ipv4/ip_output.c:1378
 icmp_push_reply+0xb7/0x760 net/ipv4/icmp.c:376
 __icmp_send+0x1a3f/0x1bb0 net/ipv4/icmp.c:972
 ipv4_send_dest_unreach net/ipv4/route.c:1255 [inline]
 ipv4_link_failure+0x8c1/0xbe0 net/ipv4/route.c:1262
 dst_link_failure include/net/dst.h:432 [inline]
 arp_error_report+0xe5/0x160 net/ipv4/arp.c:296
 neigh_invalidate+0x2aa/0x700 net/core/neighbour.c:1081
 neigh_timer_handler+0x1004/0x1450 net/core/neighbour.c:1172
 call_timer_fn+0x4c/0x4b0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2373 [inline]
 __run_timer_base+0x80f/0xd90 kernel/time/timer.c:2385
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0x3a/0x70 kernel/time/timer.c:2404
 handle_softirqs+0x168/0x6f0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x65/0x170 kernel/softirq.c:723
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1056
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697

Uninit was created at:
 __alloc_frozen_pages_noprof+0x6df/0xf50 mm/page_alloc.c:5263
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2486
 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
 alloc_pages_noprof+0x101/0x280 mm/mempolicy.c:2577
 skb_page_frag_refill+0x34e/0x730 net/core/sock.c:3146
 sk_page_frag_refill+0x59/0x190 net/core/sock.c:3166
 tcp_sendmsg_locked+0x23d8/0x76f0 net/ipv4/tcp.c:1247
 tcp_sendmsg+0x4b/0x90 net/ipv4/tcp.c:1412
 inet_sendmsg+0x134/0x290 net/ipv4/af_inet.c:859
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 __sys_sendto+0x8ea/0xb90 net/socket.c:2206
 __do_sys_sendto net/socket.c:2213 [inline]
 __se_sys_sendto net/socket.c:2209 [inline]
 __ia32_sys_sendto+0x12f/0x200 net/socket.c:2209
 ia32_sys_call+0x1a3d/0x4340 arch/x86/include/generated/asm/syscalls_32.h:370
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x14a/0x310 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Tainted: G             L      syzkaller #0 PREEMPT(voluntary) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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