From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F0F9C47258 for ; Mon, 4 May 2020 18:15:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56E7D20661 for ; Mon, 4 May 2020 18:15:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588616104; bh=YO4O5qk07yYWKRjbbepMU90BCfrnGSjV8Bk/NcGK8UE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LR/sMj/5x1Tlo7eF3MAadW24ZpGFmZgzm5W00SuTrbpYgFoemrq8GqnK4p3jr4Imn LZu72Ct3sOyyGk/yHqa4VCYAfbcHPr/vh+B3vej91n1x+jMYTLd6LtuHUfWuxEqOOX /ZBZ8F3gDQaWm8ZACSJe2t/7V5/Em54jweparnsw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730901AbgEDR76 (ORCPT ); Mon, 4 May 2020 13:59:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:53962 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730885AbgEDR7w (ORCPT ); Mon, 4 May 2020 13:59:52 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AE8F420663; Mon, 4 May 2020 17:59:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615192; bh=YO4O5qk07yYWKRjbbepMU90BCfrnGSjV8Bk/NcGK8UE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uKMfTv7H7Sxrjt/KqzTbAo789/tgdIvWAhyO+FUbMB65Gsye4AiR20VZTeFdlrvu7 mcw/nTcWr7fuRb4wT0/rtALrdTuFTs9MyY0qZ/Rgr+R/KMZr8NwJjgCvzHBF3lRsph LSGQ1iRsVlzLfwGwrAHSdCPxNMT7ahf/D0XOyE2k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dexuan Cui , "Rafael J. Wysocki" Subject: [PATCH 4.9 09/18] PM: hibernate: Freeze kernel threads in software_resume() Date: Mon, 4 May 2020 19:57:19 +0200 Message-Id: <20200504165444.062809796@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200504165442.028485341@linuxfoundation.org> References: <20200504165442.028485341@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dexuan Cui commit 2351f8d295ed63393190e39c2f7c1fee1a80578f upstream. Currently the kernel threads are not frozen in software_resume(), so between dpm_suspend_start(PMSG_QUIESCE) and resume_target_kernel(), system_freezable_power_efficient_wq can still try to submit SCSI commands and this can cause a panic since the low level SCSI driver (e.g. hv_storvsc) has quiesced the SCSI adapter and can not accept any SCSI commands: https://lkml.org/lkml/2020/4/10/47 At first I posted a fix (https://lkml.org/lkml/2020/4/21/1318) trying to resolve the issue from hv_storvsc, but with the help of Bart Van Assche, I realized it's better to fix software_resume(), since this looks like a generic issue, not only pertaining to SCSI. Cc: All applicable Signed-off-by: Dexuan Cui Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- kernel/power/hibernate.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -892,6 +892,13 @@ static int software_resume(void) error = freeze_processes(); if (error) goto Close_Finish; + + error = freeze_kernel_threads(); + if (error) { + thaw_processes(); + goto Close_Finish; + } + error = load_image_and_restore(); thaw_processes(); Finish: