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AJvYcCXaPFSqsZeToKb7JsRMi28z5mA0Bgk44sjGfQMuy1WWTGBYDyEm70qI4XDGUKOCC5XCcjCvDSO6DuJIQrI=@vger.kernel.org X-Gm-Message-State: AOJu0YxILzLzESLCt0QXisPvPh8WKHJm2lzBVbK/cA9L6DpY44eEMvFS RZRy9vPsCYlTFRTRTbGlcjId17ThFdPeRzshWBAviG/tCfPPgWFLXrtfkcqnYwXMztttXCHGnCg l8inn76uEDk32CBy/LdvPC3oh0QJ8gQbCueJ5qVdgo0i0CUTUErv5ep5uLZU= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:f93:b0:45e:8495:21f3 with SMTP id 5614622812f47-4639f1be199mr6675806b6e.40.1771357711109; Tue, 17 Feb 2026 11:48:31 -0800 (PST) Date: Tue, 17 Feb 2026 11:48:31 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6994c60f.a70a0220.2c38d7.0107.GAE@google.com> Subject: [syzbot] [fs?] WARNING in vfs_open_tree From: syzbot To: brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: fe9e3edb6a21 Add linux-next specific files for 20260217 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=153fb652580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3696efcd0f17d527 dashboard link: https://syzkaller.appspot.com/bug?extid=d09c0eed6e4176ba5c86 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1267095a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17036ffa580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3a3b845d3361/disk-fe9e3edb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/efa525980a65/vmlinux-fe9e3edb.xz kernel image: https://storage.googleapis.com/syzbot-assets/5bf9ea774626/bzImage-fe9e3edb.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d09c0eed6e4176ba5c86@syzkaller.appspotmail.com ------------[ cut here ]------------ old_ns_root->mnt_id_unique != 1 WARNING: fs/namespace.c:3112 at create_new_namespace fs/namespace.c:3112 [inline], CPU#0: syz.0.17/6017 WARNING: fs/namespace.c:3112 at open_new_namespace fs/namespace.c:3172 [inline], CPU#0: syz.0.17/6017 WARNING: fs/namespace.c:3112 at vfs_open_tree+0xf35/0xfb0 fs/namespace.c:3221, CPU#0: syz.0.17/6017 Modules linked in: CPU: 0 UID: 0 PID: 6017 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:create_new_namespace fs/namespace.c:3112 [inline] RIP: 0010:open_new_namespace fs/namespace.c:3172 [inline] RIP: 0010:vfs_open_tree+0xf35/0xfb0 fs/namespace.c:3221 Code: 39 78 ff 49 bf 00 00 00 00 00 fc ff df e9 1e fb ff ff e8 9e 39 78 ff 4d 63 ee 4c 8b 64 24 08 e9 64 ff ff ff e8 8c 39 78 ff 90 <0f> 0b 90 e9 d1 f5 ff ff e8 7e 39 78 ff 90 0f 0b 90 e9 18 f6 ff ff RSP: 0018:ffffc90004237d80 EFLAGS: 00010293 RAX: ffffffff824db904 RBX: 00000000800002b1 RCX: ffff888031f41e40 RDX: 0000000000000000 RSI: 00000000800002b1 RDI: 0000000000000001 RBP: ffffc90004237eb0 R08: ffffffff8e7fa2eb R09: 1ffffffff1cff45d R10: dffffc0000000000 R11: fffffbfff1cff45e R12: ffff88807cae1340 R13: 0000000000009902 R14: ffff888033097100 R15: dffffc0000000000 FS: 000055559209d500(0000) GS:ffff888124fff000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7055417dac CR3: 000000002e056000 CR4: 00000000003526f0 Call Trace: __do_sys_open_tree fs/namespace.c:3231 [inline] __se_sys_open_tree fs/namespace.c:3229 [inline] __x64_sys_open_tree+0x96/0x110 fs/namespace.c:3229 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f705519c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff9b19c798 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac RAX: ffffffffffffffda RBX: 00007f7055415fa0 RCX: 00007f705519c629 RDX: 0000000000009902 RSI: 0000200000000640 RDI: ffffffffffffff9c RBP: 00007f7055232b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7055415fac R14: 00007f7055415fa0 R15: 00007f7055415fa0 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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