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AJvYcCWWtmZhUqWO2q8sxDFUoZwGHubQnEA43I6bsGPE/ntfyD0F+YVLgbGwNKDH8s0jmup3J9BQMuXnJTawvOY=@vger.kernel.org X-Gm-Message-State: AOJu0Yx8KiHGK/6JXb6XJ/68tnB1w1xMS2yI4QgooqYCLxzmHtbMfdWD vB4gTetIwORMGfoBL30+nMCUi2Yuz+MON62YGN/G5Y7nWTTxSr3kiV0+Zl3qY1IjeIQhNHMsZuB YIhaObYmQy3xspmTBNB6ZdlKBv6z/8sgM3dWVE7Y1qHwEAigw+mrxdxx3dXk= X-Google-Smtp-Source: AGHT+IGiQbQSbJGoWUDS16sfg8Ogdo7rD7/vboTuECjLxjeioWAaGSzyvoClxUnJdmKvOwDhuoGUM6gfVTPdjeAHN7HFvuBTstFL Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:6015:b0:93f:c5a3:2ad7 with SMTP id ca18e2360f4ac-93fc5a32d96mr1294638839f.6.1760994565634; Mon, 20 Oct 2025 14:09:25 -0700 (PDT) Date: Mon, 20 Oct 2025 14:09:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68f6a505.050a0220.91a22.0454.GAE@google.com> Subject: [syzbot] [sctp?] KMSAN: uninit-value in sctp_sf_eat_data_6_2 From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-sctp@vger.kernel.org, lucien.xin@gmail.com, marcelo.leitner@gmail.com, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d9043c79ba68 Merge tag 'sched_urgent_for_v6.18_rc2' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=114b752f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=bbd3e7f3c2e28265 dashboard link: https://syzkaller.appspot.com/bug?extid=aa85f41343d9a3174009 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15449734580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/57a87b0986c0/disk-d9043c79.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/019c87e1df0a/vmlinux-d9043c79.xz kernel image: https://storage.googleapis.com/syzbot-assets/54f8a8b0734b/bzImage-d9043c79.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+aa85f41343d9a3174009@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in sctp_sf_eat_data_6_2+0x5fb/0xf10 net/sctp/sm_statefuns.c:3210 sctp_sf_eat_data_6_2+0x5fb/0xf10 net/sctp/sm_statefuns.c:3210 sctp_do_sm+0x196/0x9720 net/sctp/sm_sideeffect.c:1172 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+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: 0 UID: 0 PID: 6190 Comm: syz.1.23 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup