Hello, syzbot found the following issue on: HEAD commit: 94f6f0550c62 Linux 6.6-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=152d6bee680000 kernel config: https://syzkaller.appspot.com/x/.config?x=70d8e328e7a4e377 dashboard link: https://syzkaller.appspot.com/bug?extid=b015897b5913b3aa2ecd 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/6a29ef1a56e4/disk-94f6f055.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/24e09ea50a82/vmlinux-94f6f055.xz kernel image: https://storage.googleapis.com/syzbot-assets/1365bbf9b381/bzImage-94f6f055.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b015897b5913b3aa2ecd@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in __d_lookup_rcu / dont_mount read to 0xffff8881382e76c0 of 4 bytes by task 3386 on cpu 0: __d_lookup_rcu+0x42/0x290 fs/dcache.c:2360 lookup_fast+0x8e/0x290 fs/namei.c:1628 walk_component+0x3f/0x230 fs/namei.c:1997 lookup_last fs/namei.c:2458 [inline] path_lookupat+0x10a/0x2a0 fs/namei.c:2482 filename_lookup+0x126/0x300 fs/namei.c:2511 vfs_statx+0xa2/0x430 fs/stat.c:240 vfs_fstatat+0xcd/0x100 fs/stat.c:295 __do_sys_newfstatat fs/stat.c:459 [inline] __se_sys_newfstatat+0x58/0x260 fs/stat.c:453 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:453 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read-write to 0xffff8881382e76c0 of 4 bytes by task 3374 on cpu 1: dont_mount+0x27/0x40 include/linux/dcache.h:351 vfs_rmdir+0x2a9/0x2f0 fs/namei.c:4209 do_rmdir+0x194/0x310 fs/namei.c:4262 __do_sys_rmdir fs/namei.c:4281 [inline] __se_sys_rmdir fs/namei.c:4279 [inline] __x64_sys_rmdir+0x30/0x40 fs/namei.c:4279 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3374 Comm: udevd Not tainted 6.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 ================================================================== --- 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 bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
