Hello, syzbot found the following issue on: HEAD commit: a7f2e10ecd8f Merge tag 'hwmon-fixes-for-v6.14-rc8/6.14' of.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=166a383f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f33d372c4021745 dashboard link: https://syzkaller.appspot.com/bug?extid=de8b27abd23eac60e15f 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/614aabc71b48/disk-a7f2e10e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d47dd90a010a/vmlinux-a7f2e10e.xz kernel image: https://storage.googleapis.com/syzbot-assets/418d8cf8782b/bzImage-a7f2e10e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+de8b27abd23eac60e15f@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in __lookup_mnt / __se_sys_pivot_root write to 0xffff888118782d98 of 8 bytes by task 20163 on cpu 0: unhash_mnt fs/namespace.c:1030 [inline] __do_sys_pivot_root fs/namespace.c:4456 [inline] __se_sys_pivot_root+0x850/0x1090 fs/namespace.c:4388 __x64_sys_pivot_root+0x31/0x40 fs/namespace.c:4388 x64_sys_call+0x1abf/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:156 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888118782d98 of 8 bytes by task 20164 on cpu 1: __lookup_mnt+0xa0/0xf0 fs/namespace.c:839 __follow_mount_rcu fs/namei.c:1592 [inline] handle_mounts fs/namei.c:1622 [inline] step_into+0x426/0x820 fs/namei.c:1952 walk_component fs/namei.c:2120 [inline] link_path_walk+0x50e/0x830 fs/namei.c:2479 path_lookupat+0x72/0x2b0 fs/namei.c:2635 filename_lookup+0x150/0x340 fs/namei.c:2665 user_path_at+0x3c/0x120 fs/namei.c:3072 __do_sys_pivot_root fs/namespace.c:4404 [inline] __se_sys_pivot_root+0x10e/0x1090 fs/namespace.c:4388 __x64_sys_pivot_root+0x31/0x40 fs/namespace.c:4388 x64_sys_call+0x1abf/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:156 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xffff888106a31d80 -> 0xffff8881004dccc0 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 20164 Comm: syz.0.5594 Tainted: G W 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0 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
