From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail3-165.sinamail.sina.com.cn (mail3-165.sinamail.sina.com.cn [202.108.3.165]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E5D492153D8 for ; Sun, 30 Nov 2025 10:52:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.165 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764499962; cv=none; b=jmwiUjT7fBYLVxx8JzpjLr+my3y50PSWDLHvCQDfHFYq2JRyRLwFykaDsNZkeWkwloKYxQGBNduS87WucyxUKr0uN20B3TirPFFLrMdu14cCAHOqI7qvD6TIxO/OtcqLwod7jflLZe7zs1vbZHjK0B6qNUc66R6DYLhsT6uc0pg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764499962; c=relaxed/simple; bh=1VLHCbO4+QNn/wllPTfZbuYmnaOqVKmnLsNH/SH19CM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lcGo7NufSkX7at/EJ4ldNS8TcRIEINHrzttu41DPCBkeNo3suTWUR7FdfrSe3SUkIMbMc/I22kAJT6zn0p7PB0KYRwnRNK92luwdJLEi/Nvjw7j60FjHwKZKYEgOjWebcE/LVRsrfJ95f/QNQw6QtQA877/qeoKlHKBdjY3Y9Jo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=R705oBxH; arc=none smtp.client-ip=202.108.3.165 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="R705oBxH" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1764499956; bh=hCFzOjUrUR0laC68Gx3DgnQs9IBhoq15T4RK6z2Vchk=; h=From:Subject:Date:Message-ID; b=R705oBxHxAFkpnvFpW3y+Zz2wOc+Nh3lyRwd5hItX6UUQXhpQXNWb4jAiawFxv1wt ciRd+d/fDjx3yKmywrx522cwTlE1ZTlg3ZLWSE14dzSg138yYRqKKseJ6myula0iJz AewAk9VSyL63EqlyoeERUG3q/mx1ZAGlqOoeFmHE= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.57.85]) by sina.com (10.54.253.33) with ESMTP id 692C21E700002FEA; Sun, 30 Nov 2025 18:52:26 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 4913476684967 X-SMAIL-UIID: 0CECB319C068422FA879C632007F538F-20251130-185226-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [overlayfs?] WARNING in fast_dput Date: Sun, 30 Nov 2025 18:52:13 +0800 Message-ID: <20251130105214.9567-1-hdanton@sina.com> In-Reply-To: <692aef93.a70a0220.d98e3.015b.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Sat, 29 Nov 2025 05:05:23 -0800 [thread overview] > Hello, > > syzbot found the following issue on: > > HEAD commit: 7d31f578f323 Add linux-next specific files for 20251128 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=14db5f42580000 > 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 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1780a112580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f6be92580000 #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all