Hello, syzbot found the following issue on: HEAD commit: 0af2f6be1b42 Linux 6.15-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10c98070580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e5bf3e2a48bfe768 dashboard link: https://syzkaller.appspot.com/bug?extid=dbb3b5b8e91c5be8daad 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/d90ae40aa6df/disk-0af2f6be.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/616ed7a70804/vmlinux-0af2f6be.xz kernel image: https://storage.googleapis.com/syzbot-assets/ed2c418afc9a/bzImage-0af2f6be.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dbb3b5b8e91c5be8daad@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in file_end_write / posix_acl_update_mode write to 0xffff888118513aa0 of 2 bytes by task 16080 on cpu 1: posix_acl_update_mode+0x220/0x250 fs/posix_acl.c:720 simple_set_acl+0x6c/0x120 fs/posix_acl.c:1022 set_posix_acl fs/posix_acl.c:954 [inline] vfs_set_acl+0x581/0x720 fs/posix_acl.c:1133 do_set_acl+0xab/0x130 fs/posix_acl.c:1278 do_setxattr fs/xattr.c:633 [inline] filename_setxattr+0x1f1/0x2b0 fs/xattr.c:665 path_setxattrat+0x28a/0x320 fs/xattr.c:713 __do_sys_setxattr fs/xattr.c:747 [inline] __se_sys_setxattr fs/xattr.c:743 [inline] __x64_sys_setxattr+0x6e/0x90 fs/xattr.c:743 x64_sys_call+0x28e7/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:189 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888118513aa0 of 2 bytes by task 16073 on cpu 0: file_end_write+0x1f/0x110 include/linux/fs.h:3059 vfs_fallocate+0x3a5/0x3b0 fs/open.c:350 ksys_fallocate fs/open.c:362 [inline] __do_sys_fallocate fs/open.c:367 [inline] __se_sys_fallocate fs/open.c:365 [inline] __x64_sys_fallocate+0x78/0xc0 fs/open.c:365 x64_sys_call+0x295f/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:286 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x8000 -> 0x8072 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 16073 Comm: syz.6.3255 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(voluntary) 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
