===================================================== 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:980 sctp_inq_push+0x2a6/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1158 __release_sock+0x1ef/0x380 net/core/sock.c:3180 release_sock+0x6b/0x270 net/core/sock.c:3735 sctp_sendmsg+0x3a2b/0x49f0 net/sctp/socket.c:2036 inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x278/0x3d0 net/socket.c:742 sock_sendmsg+0x170/0x280 net/socket.c:765 splice_to_socket+0x10e6/0x1a60 fs/splice.c:886 do_splice_from fs/splice.c:938 [inline] do_splice+0x1fd2/0x30d0 fs/splice.c:1351 __do_splice fs/splice.c:1433 [inline] __do_sys_splice fs/splice.c:1636 [inline] __se_sys_splice+0x549/0x8c0 fs/splice.c:1618 __x64_sys_splice+0x114/0x1a0 fs/splice.c:1618 x64_sys_call+0x3140/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:276 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 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: 6168 at kernel/stacktrace.c:29 stack_trace_print+0xd4/0xf0 kernel/stacktrace.c:29 Modules linked in: CPU: 0 UID: 0 PID: 6168 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:stack_trace_print+0xd4/0xf0 kernel/stacktrace.c:29 Code: ca 7e a0 91 89 de ba 20 00 00 00 4c 89 e1 e8 b3 90 4b ff 49 83 c6 08 49 ff cd 0f 85 6e ff ff ff eb 0b e8 df 2a c7 00 eb d4 90 <0f> 0b 90 5b 41 5c 41 5d 41 5e 41 5f 5d e9 da e0 a6 0e cc 66 0f 1f RSP: 0018:ffff8880446b2e38 EFLAGS: 00010246 RAX: ffff8881165e2ca0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8880446b2e60 R08: 0000000000000000 R09: 0000000000000000 R10: ffff888043eb2e78 R11: 0000000000000001 R12: 0000000000000000 R13: 00000000abcd0100 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f04ba9fe6c0(0000) GS:ffff8881aaf79000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f04ba9fdf98 CR3: 0000000013bb6000 CR4: 00000000003526f0 Call Trace: kmsan_print_origin+0xb0/0x340 mm/kmsan/report.c:133 kmsan_report+0x1d3/0x320 mm/kmsan/report.c:196 __msan_warning+0x1b/0x30 mm/kmsan/instrumentation.c:315 sctp_inq_pop+0x14dc/0x19e0 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a0/0xbc0 net/sctp/associola.c:980 sctp_inq_push+0x2a6/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1158 __release_sock+0x1ef/0x380 net/core/sock.c:3180 release_sock+0x6b/0x270 net/core/sock.c:3735 sctp_sendmsg+0x3a2b/0x49f0 net/sctp/socket.c:2036 inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x278/0x3d0 net/socket.c:742 sock_sendmsg+0x170/0x280 net/socket.c:765 splice_to_socket+0x10e6/0x1a60 fs/splice.c:886 do_splice_from fs/splice.c:938 [inline] do_splice+0x1fd2/0x30d0 fs/splice.c:1351 __do_splice fs/splice.c:1433 [inline] __do_sys_splice fs/splice.c:1636 [inline] __se_sys_splice+0x549/0x8c0 fs/splice.c:1618 __x64_sys_splice+0x114/0x1a0 fs/splice.c:1618 x64_sys_call+0x3140/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:276 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f04bb38efc9 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:00007f04ba9fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f04bb5e6090 RCX: 00007f04bb38efc9 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007f04bb411f91 R08: 0020000000000002 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f04bb5e6128 R14: 00007f04bb5e6090 R15: 00007ffd4a0d3558 ---[ end trace 0000000000000000 ]--- Uninit was created at: slab_post_alloc_hook mm/slub.c:4969 [inline] slab_alloc_node mm/slub.c:5272 [inline] kmem_cache_alloc_node_noprof+0x989/0x16b0 mm/slub.c:5324 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1383 [inline] sctp_packet_transmit+0x44b/0x46d0 net/sctp/output.c:598 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_primitive_SEND+0xd7/0x110 net/sctp/primitive.c:163 sctp_sendmsg_to_asoc+0x1db8/0x2250 net/sctp/socket.c:1873 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2031 inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x278/0x3d0 net/socket.c:742 sock_sendmsg+0x170/0x280 net/socket.c:765 splice_to_socket+0x10e6/0x1a60 fs/splice.c:886 do_splice_from fs/splice.c:938 [inline] do_splice+0x1fd2/0x30d0 fs/splice.c:1351 __do_splice fs/splice.c:1433 [inline] __do_sys_splice fs/splice.c:1636 [inline] __se_sys_splice+0x549/0x8c0 fs/splice.c:1618 __x64_sys_splice+0x114/0x1a0 fs/splice.c:1618 x64_sys_call+0x3140/0x3e30 arch/x86/include/generated/asm/syscalls_64.h:276 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 6168 Comm: syz.2.19 Tainted: G W syzkaller #0 PREEMPT(none) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 =====================================================