Hello, syzbot found the following issue on: HEAD commit: 0d8d44db295c Merge tag 'for-6.15-rc5-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14e971cc580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6154604431d9aaf9 dashboard link: https://syzkaller.appspot.com/bug?extid=2428028ccd7d1ff933a0 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d91fa429308f/disk-0d8d44db.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/24f0298ad2f8/vmlinux-0d8d44db.xz kernel image: https://storage.googleapis.com/syzbot-assets/d805d3a8719f/bzImage-0d8d44db.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2428028ccd7d1ff933a0@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in copy_fs / free_bprm write to 0xffff88810475a110 of 4 bytes by task 10717 on cpu 0: free_bprm+0x122/0x220 fs/exec.c:1498 do_execveat_common+0x560/0x750 fs/exec.c:1970 do_execveat fs/exec.c:2053 [inline] __do_sys_execveat fs/exec.c:2127 [inline] __se_sys_execveat fs/exec.c:2121 [inline] __x64_sys_execveat+0x73/0x90 fs/exec.c:2121 x64_sys_call+0x2dae/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:323 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88810475a110 of 4 bytes by task 10715 on cpu 1: copy_fs+0x90/0xf0 kernel/fork.c:1804 copy_process+0xc6e/0x1f90 kernel/fork.c:2420 kernel_clone+0x16c/0x5b0 kernel/fork.c:2844 __do_sys_clone3 kernel/fork.c:3148 [inline] __se_sys_clone3+0x1c2/0x200 kernel/fork.c:3127 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3127 x64_sys_call+0x10c9/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:436 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 10715 Comm: syz.5.2513 Not tainted 6.15.0-rc5-syzkaller-00032-g0d8d44db295c #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 ================================================================== --- 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
