[syzbot] [net?] KMSAN: uninit-value in unix_create1
From: syzbot <hidden>
Date: 2025-06-19 22:51:25
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Hello, syzbot found the following issue on: HEAD commit: 08215f5486ec Merge tag 'kbuild-fixes-v6.16' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11b765d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=61539536677af51c dashboard link: https://syzkaller.appspot.com/bug?extid=d0fba1a09f8c1e3ddda5 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/01c395d764eb/disk-08215f54.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/15fc58e6441d/vmlinux-08215f54.xz kernel image: https://storage.googleapis.com/syzbot-assets/dbd5ac78ef83/bzImage-08215f54.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d0fba1a09f8c1e3ddda5@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in hlist_add_head include/linux/list.h:1025 [inline] BUG: KMSAN: uninit-value in __sk_add_node include/net/sock.h:853 [inline] BUG: KMSAN: uninit-value in sk_add_node include/net/sock.h:859 [inline] BUG: KMSAN: uninit-value in __unix_insert_socket net/unix/af_unix.c:380 [inline] BUG: KMSAN: uninit-value in unix_insert_unbound_socket net/unix/af_unix.c:403 [inline] BUG: KMSAN: uninit-value in unix_create1+0x973/0xbc0 net/unix/af_unix.c:1085 hlist_add_head include/linux/list.h:1025 [inline] __sk_add_node include/net/sock.h:853 [inline] sk_add_node include/net/sock.h:859 [inline] __unix_insert_socket net/unix/af_unix.c:380 [inline] unix_insert_unbound_socket net/unix/af_unix.c:403 [inline] unix_create1+0x973/0xbc0 net/unix/af_unix.c:1085 unix_create+0x193/0x220 net/unix/af_unix.c:1127 __sock_create+0x764/0xf60 net/socket.c:1541 sock_create net/socket.c:1599 [inline] __sys_socketpair+0x329/0xe30 net/socket.c:1746 __do_sys_socketpair net/socket.c:1799 [inline] __se_sys_socketpair net/socket.c:1796 [inline] __x64_sys_socketpair+0xc0/0x150 net/socket.c:1796 x64_sys_call+0x2b98/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:54 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 Uninit was created at: slab_post_alloc_hook mm/slub.c:4154 [inline] slab_alloc_node mm/slub.c:4197 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0xa36/0x1530 mm/slub.c:5015 kvmalloc_array_node_noprof include/linux/slab.h:1065 [inline] unix_net_init+0x19d/0x430 net/unix/af_unix.c:3746 ops_init+0x2b3/0x9f0 net/core/net_namespace.c:138 __register_pernet_operations net/core/net_namespace.c:1284 [inline] register_pernet_operations+0x649/0xfa0 net/core/net_namespace.c:1361 register_pernet_subsys+0x5b/0xa0 net/core/net_namespace.c:1402 af_unix_init+0x12c/0x200 net/unix/af_unix.c:3882 do_one_initcall+0x237/0xb60 init/main.c:1274 do_initcall_level+0x166/0x380 init/main.c:1336 do_initcalls+0x1b5/0x350 init/main.c:1352 do_basic_setup+0x22/0x30 init/main.c:1371 kernel_init_freeable+0x2fe/0x4d0 init/main.c:1584 kernel_init+0x2f/0x5e0 init/main.c:1474 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 1 UID: 0 PID: 5445 Comm: dhcpcd Tainted: G W 6.16.0-rc1-syzkaller-00239-g08215f5486ec #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ===================================================== --- 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 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