=====================================================
BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987
 sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987
 sctp_inq_push+0x2a6/0x350 net/sctp/inqueue.c:88
 sctp_rcv+0x3a04/0x3cb0 net/sctp/input.c:243
 sctp6_rcv+0x48/0xc0 net/sctp/ipv6.c:1127
 ip6_protocol_deliver_rcu+0x1c86/0x2c60 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x1f4/0x4a0 net/ipv6/ip6_input.c:489
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ip6_input+0x9c/0x330 net/ipv6/ip6_input.c:500
 dst_input include/net/dst.h:471 [inline]
 ip6_rcv_finish+0x5a1/0x990 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:318 [inline]
 ipv6_rcv+0xf1/0x3c0 net/ipv6/ip6_input.c:311
 __netif_receive_skb_one_core net/core/dev.c:5979 [inline]
 __netif_receive_skb+0x1df/0xac0 net/core/dev.c:6092
 process_backlog+0x485/0xa00 net/core/dev.c:6444
 __napi_poll+0xda/0x8a0 net/core/dev.c:7497
 napi_poll net/core/dev.c:7560 [inline]
 net_rx_action+0xa59/0x1ac0 net/core/dev.c:7687
 handle_softirqs+0x169/0x6e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x66/0x180 kernel/softirq.c:680
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x84/0x90 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
 pfn_valid arch/x86/include/asm/cpufeature.h:-1 [inline]
 kmsan_virt_addr_valid arch/x86/include/asm/kmsan.h:94 [inline]
 virt_to_page_or_null+0x6b/0x180 mm/kmsan/shadow.c:75
 kmsan_get_metadata+0xfb/0x160 mm/kmsan/shadow.c:141
 kmsan_internal_set_shadow_origin+0x79/0x110 mm/kmsan/core.c:224
 __msan_poison_alloca+0x152/0x1a0 mm/kmsan/instrumentation.c:289
 alloc_path_pseudo fs/file_table.c:363 [inline]
 alloc_file_pseudo+0x60/0x400 fs/file_table.c:379
 sock_alloc_file+0x107/0x580 net/socket.c:470
 sock_map_fd net/socket.c:500 [inline]
 __sys_socket+0x264/0x400 net/socket.c:1740
 __do_sys_socket net/socket.c:1745 [inline]
 __se_sys_socket net/socket.c:1743 [inline]
 __x64_sys_socket+0x95/0x100 net/socket.c:1743
 x64_sys_call+0x1487/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:42
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4186 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 __do_kmalloc_node mm/slub.c:4364 [inline]
 __kmalloc_node_track_caller_noprof+0x96d/0x12f0 mm/slub.c:4384
 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:600
 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:669
 alloc_skb include/linux/skbuff.h:1336 [inline]
 sctp_packet_pack net/sctp/output.c:472 [inline]
 sctp_packet_transmit+0x18a1/0x46d0 net/sctp/output.c:621
 sctp_outq_flush_transports net/sctp/outqueue.c:1173 [inline]
 sctp_outq_flush+0x1c7d/0x67c0 net/sctp/outqueue.c:1221
 sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline]
 sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175
 sctp_assoc_bh_rcv+0x88b/0xbc0 net/sctp/associola.c:1034
 sctp_inq_push+0x2a6/0x350 net/sctp/inqueue.c:88
 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331
 sk_backlog_rcv+0x13f/0x420 include/net/sock.h:1148
 __release_sock+0x1d3/0x330 net/core/sock.c:3194
 release_sock+0x6b/0x270 net/core/sock.c:3748
 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9367
 sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886
 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032
 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x278/0x3d0 net/socket.c:729
 __sys_sendto+0x593/0x720 net/socket.c:2228
 __do_sys_sendto net/socket.c:2235 [inline]
 __se_sys_sendto net/socket.c:2231 [inline]
 __x64_sys_sendto+0x130/0x200 net/socket.c:2231
 x64_sys_call+0x3910/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 7528 Comm: syz.6.358 Not tainted 6.16.0-syzkaller-10499-g89748acdf226 #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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