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e9e14a558f8ab-430c52b5afemr251762865ab.16.1761133981973; Wed, 22 Oct 2025 04:53:01 -0700 (PDT) Date: Wed, 22 Oct 2025 04:53:01 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68f8c59d.050a0220.346f24.0043.GAE@google.com> Subject: Re: [syzbot] [sctp?] KMSAN: uninit-value in sctp_inq_pop (3) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, vnranganath.20@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in sctp_inq_pop ===================================================== BUG: KMSAN: uninit-value in sctp_inq_pop+0x159c/0x1aa0 net/sctp/inqueue.c:213 sctp_inq_pop+0x159c/0x1aa0 net/sctp/inqueue.c:213 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: sctp_inq_pop+0x150b/0x1aa0 net/sctp/inqueue.c:209 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 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: 1 UID: 0 PID: 6609 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ===================================================== Tested on: commit: 552c5071 Merge tag 'vfio-v6.18-rc3' of https://github... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=145e2d42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bbd3e7f3c2e28265 dashboard link: https://syzkaller.appspot.com/bug?extid=d101e12bccd4095460e7 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=165fd734580000