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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 69fd6b99b8f8 Merge tag 'perf_urgent_for_v6.17_rc3' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10adec42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ccfdce02093e91f dashboard link: https://syzkaller.appspot.com/bug?extid=e69f06a0f30116c68056 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130d8462580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bfb862580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ce22f4296138/disk-69fd6b99.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/36a2af954ef6/vmlinux-69fd6b99.xz kernel image: https://storage.googleapis.com/syzbot-assets/594a8181f23a/bzImage-69fd6b99.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e69f06a0f30116c68056@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649 __sctp_v6_cmp_addr+0x887/0x8c0 net/sctp/ipv6.c:649 sctp_inet6_cmp_addr+0x4f2/0x510 net/sctp/ipv6.c:983 sctp_bind_addr_conflict+0x22a/0x3b0 net/sctp/bind_addr.c:390 sctp_get_port_local+0x21eb/0x2440 net/sctp/socket.c:8452 sctp_get_port net/sctp/socket.c:8523 [inline] sctp_listen_start net/sctp/socket.c:8567 [inline] sctp_inet_listen+0x710/0xfd0 net/sctp/socket.c:8636 __sys_listen_socket net/socket.c:1912 [inline] __sys_listen net/socket.c:1927 [inline] __do_sys_listen net/socket.c:1932 [inline] __se_sys_listen net/socket.c:1930 [inline] __x64_sys_listen+0x343/0x4c0 net/socket.c:1930 x64_sys_call+0x271d/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:51 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable t.i created at: __do_sys_futex kernel/futex/syscalls.c:165 [inline] __se_sys_futex+0x4d/0x740 kernel/futex/syscalls.c:160 __x64_sys_futex+0x114/0x1a0 kernel/futex/syscalls.c:160 CPU: 1 UID: 0 PID: 6089 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ===================================================== --- 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@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