===================================================== BUG: KMSAN: uninit-value in sctp_inq_pop+0x15c0/0x1930 net/sctp/inqueue.c:211 sctp_inq_pop+0x15c0/0x1930 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a7/0xc50 net/sctp/associola.c:998 sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1132 __release_sock+0x1da/0x330 net/core/sock.c:3163 release_sock+0x6b/0x250 net/core/sock.c:3717 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9366 sctp_sendmsg_to_asoc+0x203a/0x2070 net/sctp/socket.c:1886 sctp_sendmsg+0x32b9/0x4a90 net/sctp/socket.c:2032 inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x267/0x380 net/socket.c:727 __sys_sendto+0x594/0x750 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0x125/0x1d0 net/socket.c:2183 x64_sys_call+0x37e7/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: ------------[ cut here ]------------ WARNING: CPU: 1 PID: 21556 at kernel/stacktrace.c:29 stack_trace_print+0x102/0x120 kernel/stacktrace.c:29 Modules linked in: CPU: 1 UID: 0 PID: 21556 Comm: syz.8.1658 Not tainted 6.15.0-rc2-syzkaller-00087-gcfb2e2c57aef #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:stack_trace_print+0x102/0x120 kernel/stacktrace.c:29 Code: 4b 8d 04 2e 48 ff c0 49 ff c6 48 83 f8 01 0f 85 58 ff ff ff eb 17 31 ff e8 8b 23 bf 00 e9 54 ff ff ff e8 81 23 bf 00 eb bc 90 <0f> 0b 90 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc RSP: 0018:ffff88802eb67050 EFLAGS: 00010246 RAX: ffff888108242c18 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88802eb67080 R08: 0000000000000000 R09: 0000000000000000 R10: ffff88802e367098 R11: 0000000000003b88 R12: 0000000000000000 R13: 00000000abcd0200 R14: ffff88802eb670b0 R15: 0000000000000000 FS: 00007f5731f816c0(0000) GS:ffff8881ab057000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5731f5ff98 CR3: 000000013e006000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kmsan_print_origin+0xad/0x320 mm/kmsan/report.c:133 kmsan_report+0x1d9/0x2d0 mm/kmsan/report.c:196 __msan_warning+0x95/0x120 mm/kmsan/instrumentation.c:318 sctp_inq_pop+0x15c0/0x1930 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a7/0xc50 net/sctp/associola.c:998 sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1132 __release_sock+0x1da/0x330 net/core/sock.c:3163 release_sock+0x6b/0x250 net/core/sock.c:3717 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9366 sctp_sendmsg_to_asoc+0x203a/0x2070 net/sctp/socket.c:1886 sctp_sendmsg+0x32b9/0x4a90 net/sctp/socket.c:2032 inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x267/0x380 net/socket.c:727 __sys_sendto+0x594/0x750 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0x125/0x1d0 net/socket.c:2183 x64_sys_call+0x37e7/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f573118e169 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:00007f5731f81038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f57313b5fa0 RCX: 00007f573118e169 RDX: 000000000000fee4 RSI: 0000200000847fff RDI: 0000000000000003 RBP: 00007f5731210a68 R08: 000020000005ffe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f57313b5fa0 R15: 00007ffd4c99f398 ---[ end trace 0000000000000000 ]--- Uninit was created at: slab_post_alloc_hook mm/slub.c:4157 [inline] slab_alloc_node mm/slub.c:4200 [inline] __do_kmalloc_node mm/slub.c:4330 [inline] __kmalloc_node_track_caller_noprof+0x962/0x1260 mm/slub.c:4350 kmalloc_reserve+0x23e/0x4a0 net/core/skbuff.c:599 __alloc_skb+0x366/0x7b0 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+0x1811/0x4470 net/sctp/output.c:621 sctp_outq_flush_transports net/sctp/outqueue.c:1173 [inline] sctp_outq_flush+0x1b2f/0x6590 net/sctp/outqueue.c:1221 sctp_outq_uncork+0x9c/0xb0 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+0x8c5d/0x93e0 net/sctp/sm_sideeffect.c:1169 sctp_assoc_bh_rcv+0x8fe/0xc50 net/sctp/associola.c:1052 sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1132 __release_sock+0x1da/0x330 net/core/sock.c:3163 release_sock+0x6b/0x250 net/core/sock.c:3717 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9366 sctp_sendmsg_to_asoc+0x203a/0x2070 net/sctp/socket.c:1886 sctp_sendmsg+0x32b9/0x4a90 net/sctp/socket.c:2032 inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x267/0x380 net/socket.c:727 __sys_sendto+0x594/0x750 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __x64_sys_sendto+0x125/0x1d0 net/socket.c:2183 x64_sys_call+0x37e7/0x3c80 arch/x86/include/generated/asm/syscalls_64.h:45 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 21556 Comm: syz.8.1658 Tainted: G W 6.15.0-rc2-syzkaller-00087-gcfb2e2c57aef #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 =====================================================