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AJvYcCXU43evOPPSJ5N6QkiUGi8cLGN1kziPkIV2Qpyzi13UZqF4j+fTZseUBvmDmEt/6OLrCTx6DvObIA==@kvack.org X-Gm-Message-State: AOJu0Yz1ONJFbbHACEM+i+QGARqf7etJYKjMNX5xCLbV4/maOKRSGJXk 9VVxTxWuMBHD+jXFggUVfAQ5WdlUUb+gQ5a2+D79UDnGQYGX3Gnnfes3k7bSbCXYw1t9+4DfjVI jCJPCb9YN01uDy+LiuO2V9cKouVEjIMmY9Sh7N0ieqV/BtTx6NHokwrkX2Rg= X-Google-Smtp-Source: AGHT+IEpTzA/3NqtQbsss3Bt9ogTGA39GU8M8pGLRnvPzS3lXufcYtJkf55mtmGcYxBah4LCmhDhp2qV1vWIUjAYrBjwalX4qAqr MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2408:b0:433:29c3:c512 with SMTP id e9e14a558f8ab-43367e2d24emr143895815ab.21.1762866183264; Tue, 11 Nov 2025 05:03:03 -0800 (PST) Date: Tue, 11 Nov 2025 05:03:03 -0800 In-Reply-To: <20251111-covern-deklamieren-ee89b7b4e502@brauner> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69133407.a70a0220.22f260.0138.GAE@google.com> Subject: Re: [syzbot] [fs?] WARNING in nsproxy_ns_active_put From: syzbot To: akpm@linux-foundation.org, bpf@vger.kernel.org, brauner@kernel.org, bsegall@google.com, david@redhat.com, dietmar.eggemann@arm.com, jack@suse.cz, jsavitz@redhat.com, juri.lelli@redhat.com, kartikey406@gmail.com, kees@kernel.org, liam.howlett@oracle.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, lorenzo.stoakes@oracle.com, mgorman@suse.de, mhocko@suse.com, mingo@redhat.com, mjguzik@gmail.com, oleg@redhat.com, paul@paul-moore.com, peterz@infradead.org, rostedt@goodmis.org, rppt@kernel.org, sergeh@kernel.org, surenb@google.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, vincent.guittot@linaro.org, viro@zeniv.linux.org.uk, vschneid@redhat.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 42AB74000F X-Stat-Signature: dha4pn3irta5f7nubxt3ciy4dsf4w9p4 X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1762866184-134605 X-HE-Meta: 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XXIi817Z9IXWNNTv5pC6lSi6xD+2IlKgJ3HdOuqxnStfajmSHg09j43ijcsSQUjYQLA/wrIZ7tklxZIcjf++1qDRYCMlkX+d+5y6aeNR0A0= 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 has tested the proposed patch but the reproducer is still triggering an issue: WARNING in __ns_ref_active_put ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6581 at kernel/nscommon.c:171 __ns_ref_active_put+0x3d7/0x450 kernel/nscommon.c:171 Modules linked in: CPU: 0 UID: 0 PID: 6581 Comm: syz.0.18 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+0x3d7/0x450 kernel/nscommon.c:171 Code: 4d 8b 3e e9 1b fd ff ff e8 76 62 32 00 90 0f 0b 90 e9 29 fd ff ff e8 68 62 32 00 90 0f 0b 90 e9 59 fd ff ff e8 5a 62 32 00 90 <0f> 0b 90 e9 72 ff ff ff e8 4c 62 32 00 90 0f 0b 90 e9 64 ff ff ff RSP: 0018:ffffc9000238fd68 EFLAGS: 00010293 RAX: ffffffff818e5946 RBX: 00000000ffffffff RCX: ffff8880302ebc80 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: ffffc9000238fe00 R08: ffff888078968c2b R09: 1ffff1100f12d185 R10: dffffc0000000000 R11: ffffed100f12d186 R12: dffffc0000000000 R13: 1ffff1100f12d184 R14: ffff888078968c20 R15: ffff888078968c28 FS: 00007efc0fd536c0(0000) GS:ffff888125cf3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33263fff CR3: 0000000030876000 CR4: 00000000003526f0 Call Trace: nsproxy_ns_active_put+0x4a/0x200 fs/nsfs.c:701 free_nsproxy kernel/nsproxy.c:80 [inline] put_nsset kernel/nsproxy.c:316 [inline] __do_sys_setns kernel/nsproxy.c:-1 [inline] __se_sys_setns+0x1349/0x1b60 kernel/nsproxy.c:534 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: 0033:0x7efc0ef90ef7 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 34 01 00 00 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:00007efc0fd52fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000134 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007efc0ef90ef7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000c9 RBP: 00007efc0f011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc0f1e6038 R14: 00007efc0f1e5fa0 R15: 00007fff5692b648 Tested on: commit: cc719c88 nsproxy: fix free_nsproxy() and simplify crea.. git tree: https://github.com/brauner/linux.git namespace-6.19 console output: https://syzkaller.appspot.com/x/log.txt?x=1613f17c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=59952e73920025e4 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 Note: no patches were applied.