===================================================== 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+0x39e5/0x3c90 net/sctp/input.c:243 sctp6_rcv+0x48/0xc0 net/sctp/ipv6.c:1126 ip6_protocol_deliver_rcu+0x1c86/0x2c60 net/ipv6/ip6_input.c:436 ip6_input_finish net/ipv6/ip6_input.c:480 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] ip6_input+0x136/0x470 net/ipv6/ip6_input.c:491 dst_input include/net/dst.h:469 [inline] ip6_rcv_finish+0x5a4/0x960 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:317 [inline] ipv6_rcv+0xf1/0x3c0 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core net/core/dev.c:5977 [inline] __netif_receive_skb+0x1df/0xac0 net/core/dev.c:6090 process_backlog+0x485/0xa00 net/core/dev.c:6442 __napi_poll+0xdd/0x9c0 net/core/dev.c:7414 napi_poll net/core/dev.c:7478 [inline] net_rx_action+0xa59/0x1ac0 net/core/dev.c:7605 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 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x33/0x60 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] force_sig_info_to_task+0x6b3/0x7b0 kernel/signal.c:1324 force_sig_fault_to_task kernel/signal.c:1699 [inline] force_sig_fault+0xce/0x100 kernel/signal.c:1704 __bad_area_nosemaphore+0x5bc/0x9d0 arch/x86/mm/fault.c:823 bad_area_nosemaphore+0x32/0x40 arch/x86/mm/fault.c:832 do_user_addr_fault+0xa31/0x2560 arch/x86/mm/fault.c:1361 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x68/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623 Uninit was created at: slab_post_alloc_hook mm/slub.c:4154 [inline] slab_alloc_node mm/slub.c:4197 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_node_track_caller_noprof+0x96d/0x12f0 mm/slub.c:4347 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:601 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670 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:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 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:712 [inline] __sock_sendmsg+0x278/0x3d0 net/socket.c:727 __sys_sendto+0x593/0x720 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0x130/0x200 net/socket.c:2183 x64_sys_call+0x3c0b/0x3db0 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: 0 UID: 0 PID: 15934 Comm: syz.7.2584 Not tainted 6.16.0-rc4-syzkaller-00013-g66701750d556 #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 =====================================================