From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail3-163.sinamail.sina.com.cn (mail3-163.sinamail.sina.com.cn [202.108.3.163]) (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 80DCA2FE57B for ; Fri, 7 Nov 2025 08:54:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762505686; cv=none; b=BVGlO/pb8NOphxm9e+n+AzDnb5kKsr7HZFkbfMkSHkT5YII4kR2ImZAfsYETwaqUPm8/ERhPdSGz3hLKQAPj8IbDVGGhOAYx9RDiA0MmLUYpA1e6YYtepmAEsnwJteLM4I7YTh7A3emTuKAscZehSiqntJgtIw2311S4OIrLzis= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762505686; c=relaxed/simple; bh=FgB7xQrrip0UmPtbkZTEGBDT+lI6ArYz4H5RqY06tow=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZVF+W6VpcMRc1Wvcj9ZBbzhhBnFScfUDVJp1xs3k1au7CdEJ+Z6dahaJlTnu/TOYIknWdSLWA1WGTXcUO4T1LEYFgCaTXHTAkG0TUfssyupyxmTkTYP1fmmztMXOQfC8EiqKppamFOQ6nA9+eYkrWNrbknjTt1h5+oxbNeBs25A= 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=eVG8t/d0; arc=none smtp.client-ip=202.108.3.163 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="eVG8t/d0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1762505679; bh=DLx9MQIirPEPLM8OfADF/je8IuPf2VO0TJMFJ6QaqJQ=; h=From:Subject:Date:Message-ID; b=eVG8t/d0mB7H+asqXfClOS+dCN7YHb3AwLjdup2LqiNAtC55vWVr69OPN4duVmLL9 9j/ZeSiueo1uUZzytFvUIP9lOxv3ObR3t43tI58ktXKdu4Y9ZLBZrSP/C7nnBklWAp SJWSbioolvDjdBX9Q5fxc4uLyA8urd4WlAEHgEas= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.57.85]) by sina.com (10.54.253.34) with ESMTP id 690DB3C9000076D4; Fri, 7 Nov 2025 16:54:35 +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: 1583146292076 X-SMAIL-UIID: 0D28CBA4A6D84489B711A2E74DB45FAA-20251107-165435-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [fs?] WARNING in destroy_super_work Date: Fri, 7 Nov 2025 16:54:21 +0800 Message-ID: <20251107085422.8964-1-hdanton@sina.com> In-Reply-To: <690da04f.a70a0220.22f260.0027.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: Thu, 06 Nov 2025 23:31:27 -0800 > Hello, > > syzbot found the following issue on: > > HEAD commit: 982312090977 Add linux-next specific files for 20251103 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=17b2932f980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=43cc0e31558cb527 > dashboard link: https://syzkaller.appspot.com/bug?extid=1957b26299cf3ff7890c > 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=1347817c580000 #syz test --- x/kernel/nscommon.c +++ y/kernel/nscommon.c @@ -117,9 +117,7 @@ struct ns_common *__must_check ns_owner( void __ns_ref_active_get_owner(struct ns_common *ns) { - ns = ns_owner(ns); - if (ns) - WARN_ON_ONCE(atomic_add_negative(1, &ns->__ns_ref_active)); + __ns_ref_active_resurrect(ns); } /* --