Hello, syzbot found the following issue on: HEAD commit: a2cc6ff5ec8f Merge tag 'firewire-updates-6.15' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14bfcfb0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bace10fc34ab2694 dashboard link: https://syzkaller.appspot.com/bug?extid=773e51afe420baaf0e2b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7c6e49399ec3/disk-a2cc6ff5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bd9ebb7bb091/vmlinux-a2cc6ff5.xz kernel image: https://storage.googleapis.com/syzbot-assets/b416a727e72b/bzImage-a2cc6ff5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+773e51afe420baaf0e2b@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x38e/0xc50 net/sctp/associola.c:1005 sctp_assoc_bh_rcv+0x38e/0xc50 net/sctp/associola.c:1005 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:1126 __release_sock+0x1da/0x330 net/core/sock.c:3158 release_sock+0x6b/0x250 net/core/sock.c:3712 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9360 sctp_sendmsg_to_asoc+0x1ec1/0x1f00 net/sctp/socket.c:1885 sctp_sendmsg+0x32b9/0x4a90 net/sctp/socket.c:2031 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 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:1126 __release_sock+0x1da/0x330 net/core/sock.c:3158 release_sock+0x6b/0x250 net/core/sock.c:3712 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9360 sctp_sendmsg_to_asoc+0x1ec1/0x1f00 net/sctp/socket.c:1885 sctp_sendmsg+0x32b9/0x4a90 net/sctp/socket.c:2031 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: 10529 Comm: syz.3.1552 Tainted: G W 6.14.0-syzkaller-12966-ga2cc6ff5ec8f #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ===================================================== --- 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@xxxxxxxxxxxxxxxx. 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 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
