===================================================== BUG: KMSAN: uninit-value in sctp_inq_pop+0x14dc/0x19e0 net/sctp/inqueue.c:211 sctp_inq_pop+0x14dc/0x19e0 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a0/0xbc0 net/sctp/associola.c:998 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x13f/0x420 include/net/sock.h:1132 __release_sock+0x1d3/0x330 net/core/sock.c:3163 release_sock+0x6b/0x270 net/core/sock.c:3717 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9366 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+0x590/0x710 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+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 12268 at kernel/stacktrace.c:29 stack_trace_print+0xd4/0xf0 kernel/stacktrace.c:29 Modules linked in: CPU: 0 UID: 0 PID: 12268 Comm: syz.9.1792 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:stack_trace_print+0xd4/0xf0 kernel/stacktrace.c:29 Code: 88 22 e0 91 89 de ba 20 00 00 00 4c 89 e1 e8 33 d5 4f ff 49 83 c6 08 49 ff cd 0f 85 6e ff ff ff eb 0b e8 2f e7 c0 00 eb d4 90 <0f> 0b 90 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 66 0f 1f RSP: 0018:ffff888052c17098 EFLAGS: 00010246 RAX: ffff88811a5aac18 RBX: 0000000000000000 RCX: 000007ffffffffff RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888052c170c0 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8880524170d8 R11: fffffffffffd41d0 R12: 0000000000000000 R13: 00000000abcd0100 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f19316d36c0(0000) GS:ffff8881aaac5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000854000 CR3: 000000006b84e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kmsan_print_origin+0xb0/0x340 mm/kmsan/report.c:133 kmsan_report+0x1b8/0x2a0 mm/kmsan/report.c:196 __msan_warning+0x96/0x120 mm/kmsan/instrumentation.c:318 sctp_inq_pop+0x14dc/0x19e0 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a0/0xbc0 net/sctp/associola.c:998 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x13f/0x420 include/net/sock.h:1132 __release_sock+0x1d3/0x330 net/core/sock.c:3163 release_sock+0x6b/0x270 net/core/sock.c:3717 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9366 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+0x590/0x710 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+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f193078e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f19316d3038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f19309b5fa0 RCX: 00007f193078e969 RDX: 000000000000cf88 RSI: 0000200000847fff RDI: 0000000000000003 RBP: 00007f1930810ab1 R08: 000020000005ffe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f19309b5fa0 R15: 00007ffcfc369ee8 ---[ end trace 0000000000000000 ]--- Uninit was created at: slab_post_alloc_hook mm/slub.c:4167 [inline] slab_alloc_node mm/slub.c:4210 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_node_track_caller_noprof+0x96d/0x12f0 mm/slub.c:4360 kmalloc_reserve+0x22f/0x4b0 net/core/skbuff.c:599 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] sctp_packet_pack net/sctp/output.c:472 [inline] sctp_packet_transmit+0x189e/0x4560 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:1198 [inline] sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1169 sctp_assoc_bh_rcv+0x88b/0xbc0 net/sctp/associola.c:1052 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x13f/0x420 include/net/sock.h:1132 __release_sock+0x1d3/0x330 net/core/sock.c:3163 release_sock+0x6b/0x270 net/core/sock.c:3717 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9366 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+0x590/0x710 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+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 12268 Comm: syz.9.1792 Tainted: G W 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 =====================================================