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Thu, 20 Mar 2025 12:09:36 -0700 (PDT) Date: Thu, 20 Mar 2025 12:09:36 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67dc67f0.050a0220.25ae54.001f.GAE@google.com> Subject: [syzbot] [fs?] [mm?] KCSAN: data-race in bprm_execve / copy_fs (4) From: syzbot To: brauner@kernel.org, jack@suse.cz, kees@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 3E68218001F X-Stat-Signature: 7hgxz9ptp17brrx8mceb7shh33yh5p9i X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1742498183-211074 X-HE-Meta: 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 0nx5FQrG 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 PkR491Jd NQFNypD6BbPd3Dbh6b97ROCNqxqLV+8qurW9BxUAvV/9RHdvkYemY8CZNb+QsEbCg9Tt6IkaqXLsxcCiN7tFY1vre9eT4IgUI2/WORVn95oh9wPpYc3J0hsM9XOdClROZ8SCaDoF/a3awuJSdSIdSUF+a2azfRAUJAk8oOw4B9uOfKDW+OGUwN3sYvOW1ugzTdc2dtwNVk/l5oyRw/roiyHYoqQlnyjZn9IhqEpgpRqXU73vIl/KLAzGa+m3fJac7LuvEfkA9tAAojS97Vb9kLzOQag6uKglixA+KW0Caex5KYBpyEplOhex7xIIkhOGgKXfIaHzVel8NWJVV618FZ4NS26HhOoWWjUZHBJRVhS3Pz/oNsooKu4ckdSWfpCGuDg+ibSc0LSkWUgJgNBUg9rI5rxq9IsH X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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=114fee98580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f33d372c4021745 dashboard link: https://syzkaller.appspot.com/bug?extid=1c486d0b62032c82a968 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+1c486d0b62032c82a968@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in bprm_execve / copy_fs write to 0xffff8881044f8250 of 4 bytes by task 13692 on cpu 0: bprm_execve+0x748/0x9c0 fs/exec.c:1884 do_execveat_common+0x769/0x7e0 fs/exec.c:1966 do_execveat fs/exec.c:2051 [inline] __do_sys_execveat fs/exec.c:2125 [inline] __se_sys_execveat fs/exec.c:2119 [inline] __x64_sys_execveat+0x75/0x90 fs/exec.c:2119 x64_sys_call+0x291e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:323 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 0xffff8881044f8250 of 4 bytes by task 13686 on cpu 1: copy_fs+0x95/0xf0 kernel/fork.c:1770 copy_process+0xc91/0x1f50 kernel/fork.c:2394 kernel_clone+0x167/0x5e0 kernel/fork.c:2815 __do_sys_clone3 kernel/fork.c:3119 [inline] __se_sys_clone3+0x1c1/0x200 kernel/fork.c:3098 __x64_sys_clone3+0x31/0x40 kernel/fork.c:3098 x64_sys_call+0x2d56/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:436 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: 0x00000001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 13686 Comm: syz.1.3826 Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0 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@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