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Mon, 22 Sep 2025 00:44:31 -0700 (PDT) Date: Mon, 22 Sep 2025 00:44:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d0fe5f.a00a0220.37dadf.0046.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in __ns_tree_remove (8) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 846bd2225ec3 Add linux-next specific files for 20250919 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1065be42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d4a7665929dce15c dashboard link: https://syzkaller.appspot.com/bug?extid=a709c87b450d0d76fdb1 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=11fe4d04580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cb9b7388a93f/disk-846bd222.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c509e16ebe42/vmlinux-846bd222.xz kernel image: https://storage.googleapis.com/syzbot-assets/1cab2834ac1b/bzImage-846bd222.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a709c87b450d0d76fdb1@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: kernel/nstree.c:115 at __ns_tree_remove+0x28d/0x330 kernel/nstree.c:115, CPU#0: syz.2.780/9341 Modules linked in: CPU: 0 UID: 0 PID: 9341 Comm: syz.2.780 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:__ns_tree_remove+0x28d/0x330 kernel/nstree.c:115 Code: 0f 85 a4 00 00 00 48 8b 04 24 ff 00 48 8b 7c 24 18 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 79 92 f9 09 e8 54 f5 31 00 90 <0f> 0b 90 e9 cc fd ff ff e8 46 f5 31 00 90 0f 0b 90 e9 ee fd ff ff RSP: 0018:ffffc9000e427708 EFLAGS: 00010293 RAX: ffffffff818de3cc RBX: ffff88805df2c820 RCX: ffff88805bd15ac0 RDX: 0000000000000000 RSI: ffff88805df2c820 RDI: ffff88805df2c820 RBP: dffffc0000000000 R08: ffffffff8e1efb53 R09: 1ffffffff1c3df6a R10: dffffc0000000000 R11: fffffbfff1c3df6b R12: ffff88805df2c820 R13: 1ffff1100bbe5903 R14: ffff88805df2c800 R15: ffffffff8e1ea3c0 FS: 00007fb7a87da6c0(0000) GS:ffff8881259e7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffaa6095e8 CR3: 0000000031e7e000 CR4: 00000000003526f0 Call Trace: mnt_ns_tree_remove fs/namespace.c:165 [inline] free_mnt_ns+0xd1/0x110 fs/namespace.c:4066 namespace_unlock+0x529/0x760 fs/namespace.c:1710 class_namespace_excl_destructor fs/namespace.c:96 [inline] copy_mnt_ns+0x6e0/0x870 fs/namespace.c:4172 create_new_namespaces+0xd1/0x720 kernel/nsproxy.c:78 copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:175 copy_process+0x1733/0x3c00 kernel/fork.c:2199 kernel_clone+0x21e/0x840 kernel/fork.c:2624 __do_sys_clone kernel/fork.c:2765 [inline] __se_sys_clone kernel/fork.c:2749 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2749 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: 0033:0x7fb7a798ec29 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:00007fb7a87d9fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fb7a7bd6090 RCX: 00007fb7a798ec29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000a5000 RBP: 00007fb7a7a11e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fb7a7bd6128 R14: 00007fb7a7bd6090 R15: 00007fff04cb79a8 --- 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