From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-166.sina.com.cn (smtp153-166.sina.com.cn [61.135.153.166]) (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 662903AE188 for ; Thu, 27 Aug 2026 08:16:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.166 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787818581; cv=none; b=rxXnlqDnif9RADxhNCDftXZ9nLoRaqmd7DPUnRJrsdcNsnQe9jzUE1Dqhf1B1aGCiNIxxvtb2h44W5gnLfEDNHrsmZjpL1bMscJe/qUjK9eHkEed7tQQom+gzjhy3jEYjrGAbOwkqZShfn4EAG2PYiARmVjrlp/OlMtA3ASSX5c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787818581; c=relaxed/simple; bh=DNL6vgkyw8uXqcVjDbvi9LwFW9vMiO2VC/fqcXID/ls=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AT0apugHPKylX85eOnkjBGAve3huAW2zhsROdpMdYDIZaph+zGRt0qnnh7Sp2WYuFWgfhjPszk9aCyTG5BH5HDV+Q9QspVfh3xpx9Fy6ZBfS2w6ivi0CwN1vi+tUmi8j8QkKw6RnHgxZKERimvAa5nQY1DE1qK3M+sYtdLaNvkA= 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=SLGXtTUl; arc=none smtp.client-ip=61.135.153.166 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="SLGXtTUl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1787818573; bh=qKfEQ7o/eoHs9NRMsF+NhBhP/cNLwdpkjXXgbX681Jk=; h=From:Subject:Date:Message-ID; b=SLGXtTUlNaeNCyeaUfGZ6L76wgKLHCUfc8mSjDpwWFcZ2vaofwDb+LYKfIA/AKZpR BE/GMVdN0gn8jcU5zyp5pLIPbmw9+KhAuSecWGrRPGO795Y9q2B6UmBNPo7mWttYED ttVvA7rw6c4JjeZCDVmZeZEnGHG+LjTewcClf194= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.62.194]) by sina.com (10.54.253.33) with ESMTP id 6A8FF24600001086; Thu, 27 Aug 2026 16:16:07 +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: 7251856685968 X-SMAIL-UIID: EF603BC328A144C28A9C0863E7F95D5D-20260827-161607-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [kernfs?] possible deadlock in kernfs_link_sibling (2) Date: Thu, 27 Aug 2026 16:15:54 +0800 Message-ID: <20260827081556.1819-1-hdanton@sina.com> In-Reply-To: <6a8f3f8b.50659fcc.60cd.0005.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: Wed, 26 Aug 2026 12:33:31 -0700 [thread overview] > syzbot has found a reproducer for the following issue on: > > HEAD commit: 818bebeb63dd drm/xe: Don't hand out the flat CCS storage a.. > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > console output: https://syzkaller.appspot.com/x/log.txt?x=10059625580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78 > dashboard link: https://syzkaller.appspot.com/bug?extid=dd764a450d93885d847f > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13de8d49580000 #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 818bebeb63dd --- x/lib/once.c +++ y/lib/once.c @@ -93,6 +93,6 @@ void __do_once_sleepable_done(bool *done { *done = true; mutex_unlock(&once_mutex); - static_branch_disable(once_key); + once_disable_jump(once_key, mod); } EXPORT_SYMBOL(__do_once_sleepable_done); --