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AJvYcCVob8KPgzoMHgzw3mkNSqEuY8OldXaRqYVi5wNmd/28qUPrX+PHa6kDrSNlrk7cG9AD+C+SxbYwhLSHQW8=@vger.kernel.org X-Gm-Message-State: AOJu0YwLGNDbQeSAIAkEYdxOHxPO1SMypGMHCqIlHPPYMhFi57W8mPoy tvSyPQIh0aLwKSuqrD6hbGkL98bSkJTB/TKlgKYgVPbbeBXHnhboj2/AZsSqyzH7yk6/vpc8SKn v2b8EvXFShcu6By+vn/jy/Vy4glg0AiBXFwt2WmerHhg44NvJhM1y2SGJMHA= X-Google-Smtp-Source: AGHT+IEXkE2G6QwYJ+3X3rDvjPn84FiKipnvhlr8SNan8kdkQwAY+qxHrQzY2Y2cKGdKCVDkCGYarxUrNvCfY9e+fel2SDu90b4o Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:218b:b0:433:7a5f:9439 with SMTP id e9e14a558f8ab-4337a5f9550mr101056925ab.24.1762869242560; Tue, 11 Nov 2025 05:54:02 -0800 (PST) Date: Tue, 11 Nov 2025 05:54:02 -0800 In-Reply-To: <20251111-komponente-verprellen-a5ba489f5830@brauner> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69133ffa.a70a0220.22f260.0139.GAE@google.com> Subject: Re: [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 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: 6510 at kernel/nscommon.c:171 __ns_ref_active_put+0x3d7/0x450 kernel/nscommon.c:171 Modules linked in: CPU: 0 UID: 0 PID: 6510 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:ffffc900038dfa60 EFLAGS: 00010293 RAX: ffffffff818e5946 RBX: 00000000ffffffff RCX: ffff88802f641e40 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: ffffc900038dfc00 R08: ffff88807dbaac6b R09: 1ffff1100fb7558d R10: dffffc0000000000 R11: ffffed100fb7558e R12: dffffc0000000000 R13: 1ffff1100fb7558c R14: ffff88807dbaac60 R15: ffff88807dbaac68 FS: 0000000000000000(0000) GS:ffff888125cf3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555674424a8 CR3: 000000000df38000 CR4: 00000000003526f0 Call Trace: nsproxy_ns_active_put+0x87/0x200 fs/nsfs.c:702 free_nsproxy kernel/nsproxy.c:80 [inline] put_nsproxy include/linux/nsproxy.h:110 [inline] switch_task_namespaces+0xc2/0x120 kernel/nsproxy.c:223 do_exit+0x6b0/0x2300 kernel/exit.c:966 do_group_exit+0x21c/0x2d0 kernel/exit.c:1108 get_signal+0x1285/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efc6318f6c9 Code: Unable to access opcode bytes at 0x7efc6318f69f. RSP: 002b:00007efc63f910e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007efc633e5fa8 RCX: 00007efc6318f6c9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007efc633e5fa8 RBP: 00007efc633e5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efc633e6038 R14: 00007fff3109d6b0 R15: 00007fff3109d798 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=147c8658580000 kernel config: https://syzkaller.appspot.com/x/.config?x=59952e73920025e4 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 Note: no patches were applied.