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AJvYcCW7eY1MclyPAsmSF0khjiq1KBcX6yWzs/QMOera1U73bRVHnM8KKd3HPXWHuu1l1ka+1zPd25rtzP8r4MY=@vger.kernel.org X-Gm-Message-State: AOJu0Yy5aP4U8xZa+IYBS9GuKH4kXXfE7d2tkPZId1Ha6E6ISiIA6SJS p8L02sbJ+l6/VTQeRGIW3IPkO+Z6X6hkDsaH1rBQBSuJM8f6SwsOAH/E2sxP10VSe4gqSlImoXW Oto/OzIA/yo9NHGUmF0oan/55GsQL+bo2iq/r1TfMLaTb+7ig2c7rgmJt+TE= X-Google-Smtp-Source: AGHT+IEslkHwhCnEUx7oQ2lr8t6lnhPJfmmn2rPKJQpF7/hSsEkPLdQGongzLfnM0sP4JXY6pBVu7kqdpQ85aXuxseWGmQ7Ks/8+ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:219b:b0:42e:7273:a370 with SMTP id e9e14a558f8ab-435b9842d72mr289616045ab.5.1764454684102; Sat, 29 Nov 2025 14:18:04 -0800 (PST) Date: Sat, 29 Nov 2025 14:18:04 -0800 In-Reply-To: <20251129215828.9544-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692b711c.050a0220.2ffa18.0013.GAE@google.com> Subject: Re: [syzbot] [overlayfs?] WARNING in fast_dput From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in fast_dput ------------[ cut here ]------------ WARNING: fs/dcache.c:829 at fast_dput+0x334/0x430 fs/dcache.c:829, CPU#1: syz.0.17/6545 Modules linked in: CPU: 1 UID: 0 PID: 6545 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:fast_dput+0x334/0x430 fs/dcache.c:829 Code: e3 81 ff 48 b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 0f 85 e2 00 00 00 41 80 0e 40 e9 fd fe ff ff e8 4d e3 81 ff 90 <0f> 0b 90 e9 ef fe ff ff 44 89 e6 81 e6 00 00 04 00 31 ff e8 74 e7 RSP: 0018:ffffc90003147cd8 EFLAGS: 00010293 RAX: ffffffff823fcfe3 RBX: ffff88805c212988 RCX: ffff8880779bbd00 RDX: 0000000000000000 RSI: 00000000ffffff80 RDI: 0000000000000001 RBP: 00000000ffffff80 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000628f8c R12: dffffc0000000000 R13: 1ffff1100b842539 R14: ffff88805c2128d0 R15: ffff88805c2129c8 FS: 000055558468e500(0000) GS:ffff888125f4f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30763fff CR3: 000000007d39a000 CR4: 00000000003526f0 Call Trace: dput+0xe8/0x1a0 fs/dcache.c:924 __fput+0x68e/0xa70 fs/file_table.c:476 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb34398f749 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:00007ffd90d758e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000021fa6 RCX: 00007fb34398f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fb343be7da0 R08: 0000000000000001 R09: 0000000290d75bdf R10: 0000001b2fb20000 R11: 0000000000000246 R12: 00007fb343be5fac R13: 00007fb343be5fa0 R14: ffffffffffffffff R15: 00007ffd90d75a00 Tested on: commit: 7d31f578 Add linux-next specific files for 20251128 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12b430c2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6336d8e94a7c517d dashboard link: https://syzkaller.appspot.com/bug?extid=b74150fd2ef40e716ca2 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=144dfe92580000