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AJvYcCUo/6McowBpFYp+g+DMBJOpRRVw4P4bghtqpntWByqYakWoG17kGNUuJ0tbaPId0e+mjs1Ty2CGLZpyi4U=@vger.kernel.org X-Gm-Message-State: AOJu0YxHSHOxqHj4f+xdTLsBS8ldPgsmeHGIMnENKWVo34cAB9MKy7xi X2mMb0zLYS/WN4x9qphtji3aj2SpWDzuri+CwZXZUENkYbgBaFQ6+PK67L5TI8ZEZ1/47/ebRV5 SNl8TEjhoWek6kZ3JH63S3POl/UcJ0IO80ubLHxM5oci8WaOiUWwtqycNj9I= X-Google-Smtp-Source: AGHT+IGWoC7uysYCk1FSnzzc7apNvC0hEWJoDC4pBY+r4h2NZp0KmGuTtwQm6LWJkyxGg7ORf0FPueICeSkjhoNHGJ//bHIKqAmj Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1567:b0:433:2400:2eef with SMTP id e9e14a558f8ab-4334ee78384mr24853605ab.13.1762392928395; Wed, 05 Nov 2025 17:35:28 -0800 (PST) Date: Wed, 05 Nov 2025 17:35:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <690bfb60.050a0220.2e3c35.0012.GAE@google.com> Subject: [syzbot] [fs?] WARNING in nsproxy_ns_active_get 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: 17490bd0527f Add linux-next specific files for 20251104 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1006532f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=9995c0d2611ab121 dashboard link: https://syzkaller.appspot.com/bug?extid=0a8655a80e189278487e compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1406532f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1166ff34580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a4d318147846/disk-17490bd0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/86641a470170/vmlinux-17490bd0.xz kernel image: https://storage.googleapis.com/syzbot-assets/35c008a540c8/bzImage-17490bd0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0a8655a80e189278487e@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: ./include/linux/ns_common.h:288 at __ns_ref_active_get include/linux/ns_common.h:288 [inline], CPU#1: syz.0.20/6007 WARNING: ./include/linux/ns_common.h:288 at nsproxy_ns_active_get+0x8ab/0xcb0 fs/nsfs.c:690, CPU#1: syz.0.20/6007 Modules linked in: CPU: 1 UID: 0 PID: 6007 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__ns_ref_active_get include/linux/ns_common.h:288 [inline] RIP: 0010:nsproxy_ns_active_get+0x8ab/0xcb0 fs/nsfs.c:690 Code: 5f 5d e9 08 ca 18 09 cc e8 32 8c 77 ff 90 0f 0b 90 e9 ee f7 ff ff e8 24 8c 77 ff 90 0f 0b 90 e9 12 f8 ff ff e8 16 8c 77 ff 90 <0f> 0b 90 e9 dc f8 ff ff e8 08 8c 77 ff 90 0f 0b 90 e9 03 f9 ff ff RSP: 0018:ffffc900039cfd40 EFLAGS: 00010293 RAX: ffffffff8249d07a RBX: ffff8880582bb680 RCX: ffff88806aeb5b80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 00000000f0000301 R08: ffff88807ca21913 R09: 1ffff1100f944322 R10: dffffc0000000000 R11: ffffed100f944323 R12: dffffc0000000000 R13: 1ffff1100d52d683 R14: ffff88807ca21910 R15: ffff88807ca216c0 FS: 0000555570bd2500(0000) GS:ffff888125b92000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30163fff CR3: 000000007d256000 CR4: 00000000003526f0 Call Trace: switch_task_namespaces+0x3e/0x110 kernel/nsproxy.c:240 commit_nsset kernel/nsproxy.c:555 [inline] __do_sys_setns kernel/nsproxy.c:591 [inline] __se_sys_setns+0x784/0x17d0 kernel/nsproxy.c:559 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc583f8f6c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd2014d848 EFLAGS: 00000246 ORIG_RAX: 0000000000000134 RAX: ffffffffffffffda RBX: 00007fc5841e5fa0 RCX: 00007fc583f8f6c9 RDX: 0000000000000000 RSI: 0000000024020000 RDI: 0000000000000003 RBP: 00007fc584011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc5841e5fa0 R14: 00007fc5841e5fa0 R15: 0000000000000002 --- 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