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AJvYcCWlV2Wu3ytsjVpGAnZDr3TBWbEJpmQ62dSK81gEEVcq1n+oVu0q9PjkuPAgxZ/F96Bln0G3MoixjauKwzo=@vger.kernel.org X-Gm-Message-State: AOJu0YzLBlFY/L5Vk7+RkLzkeUFlQSmesF8GUKRbVTDY9XuDFqQ1g5JN 4fraV8xu44o7C7vPcilGrDr30l7QX3pGNzPUDaoUSZy6YUpJCgghQIHQ1F9jNXc2FiY61QCJer5 iLzeR5A/pxg5hs6acAVUpn9vsG8TgTQYvMGQy9FyXTfrES3pJ4OkgZBx4hUA= X-Google-Smtp-Source: AGHT+IFReihuyYU4BCH+Ov1aj7W1fIb5L6lil8IpnBef5+mq3JWw0Audvts4uztlVvgQjx2NnhLa2cE8XHwMHFSWWAJ08PZPoG1h Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1606:b0:433:34b5:37bc with SMTP id e9e14a558f8ab-433407d4e88mr76669285ab.30.1762392990098; Wed, 05 Nov 2025 17:36:30 -0800 (PST) Date: Wed, 05 Nov 2025 17:36:30 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <690bfb9e.050a0220.2e3c35.0013.GAE@google.com> Subject: [syzbot] [fs?] WARNING in nsproxy_ns_active_put 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: 84d39fb9d529 Add linux-next specific files for 20251105 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=122ec0b4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=413cf24e78b667b9 dashboard link: https://syzkaller.appspot.com/bug?extid=0b2e79f91ff6579bfa5b 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=12e09342580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14126114580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/49de85e8d717/disk-84d39fb9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4fd90ea7659f/vmlinux-84d39fb9.xz kernel image: https://storage.googleapis.com/syzbot-assets/235e0ee874fe/bzImage-84d39fb9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0b2e79f91ff6579bfa5b@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: ./include/linux/ns_common.h:311 at __ns_ref_active_put include/linux/ns_common.h:311 [inline], CPU#0: syz.2.29/6060 WARNING: ./include/linux/ns_common.h:311 at nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707, CPU#0: syz.2.29/6060 Modules linked in: CPU: 0 UID: 0 PID: 6060 Comm: syz.2.29 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_put include/linux/ns_common.h:311 [inline] RIP: 0010:nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707 Code: 0f 0b 90 e9 71 fc ff ff e8 54 52 77 ff 90 0f 0b 90 e9 ab fc ff ff e8 46 52 77 ff 90 0f 0b 90 e9 41 fd ff ff e8 38 52 77 ff 90 <0f> 0b 90 e9 64 fd ff ff e8 2a 52 77 ff 90 0f 0b 90 e9 98 fd ff ff RSP: 0018:ffffc900033f7d38 EFLAGS: 00010293 RAX: ffffffff824a1b88 RBX: ffff88805876a750 RCX: ffff88807e148000 RDX: 0000000000000000 RSI: 00000000effffff8 RDI: 00000000effffff8 RBP: 00000000effffff8 R08: ffffffff8e36cb4b R09: 1ffffffff1c6d969 R10: dffffc0000000000 R11: fffffbfff1c6d96a R12: dffffc0000000000 R13: 1ffffffff1c6d955 R14: ffffffff8e36ca80 R15: ffffffff8e36caa8 FS: 00005555653d3500(0000) GS:ffff888125a8b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30163fff CR3: 0000000076924000 CR4: 00000000003526f0 Call Trace: free_nsproxy+0x26/0x560 kernel/nsproxy.c:190 put_nsset kernel/nsproxy.c:341 [inline] __do_sys_setns kernel/nsproxy.c:594 [inline] __se_sys_setns+0x1268/0x17d0 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 --- 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