From mboxrd@z Thu Jan 1 00:00:00 1970 X-GM-THRID: 6631438923266523136 X-Received: by 2002:a2e:7803:: with SMTP id t3-v6mr2240923ljc.11.1544012096907; Wed, 05 Dec 2018 04:14:56 -0800 (PST) X-BeenThere: isar-users@googlegroups.com Received: by 2002:a2e:9d8e:: with SMTP id c14-v6ls2131303ljj.10.gmail; Wed, 05 Dec 2018 04:14:56 -0800 (PST) X-Google-Smtp-Source: AFSGD/WtlbjLfrOvhhHACRSrbazaSbtxhAcP7+woV1gJTH9cOqup3qqEFFyvXlPeTfwejwmVwwi3 X-Received: by 2002:a2e:7f12:: with SMTP id a18-v6mr2171856ljd.2.1544012096170; Wed, 05 Dec 2018 04:14:56 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1544012096; cv=none; d=google.com; s=arc-20160816; b=p8DsLyx5sNCBbu/dbABt4wIWC7mp3BRWORtSa2lcgtOTT1fvDfeON7V8q0ieEmrqug TOXHlFILub7toSsAYMf747RPuuiX0VnQ/LNpFMGV1qV3nuWwi8GHncsH9UTI9eOrtb9A cY6fFvp2N15BLLOtTHFenUL3kYPgZJi8Qm4035V0SFNo/+eDsf9MQ+kFTDX2d4ZIWKHS fd3Y6GLwR3zn6wcSk24y4LHeObrW7xzhetzLB73EWVIQXmIeWW52HSYUHWsg7UTOzkkE X2GLADmZqRHF43NnVKTL0oMw32vspSFmCSjoq+ychHq+x6F4V2RVgzcdQAE+80Nd7sWH uXRA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:from:references:cc:to:subject; bh=DbbPQmxAT+u+McfA/O/WUeZ68hCC6IX1KwrgclmhGfY=; b=UFUAMYbzJZo7iK9ctilN7ZlBQJbQWu+A4JpagQkp6HpVlQb+MinCuhiDfMVQHNzobl RqoR0VH8CdKlY+tf3GnFISPOF6rGHdJVrLoQz+s5quJisGid5ELR3i4qVGXPgWXx4W1X YpjaJpo8ZtQ+EgMxA4rbHJZZEIk44zwVskhIQlUdy/wmjSAcgC9gB5Hzi93YlQJifxSv r+KZFsTwdLTNP/rnPTWc0sPtEzv1xP2VNT5hHfhyL/dcAOFSi14TGAHB98hHdlC/n8hC IrBKOv46Ajbs1v/oI1LAOu1gJk4/QyTKs9q3tOwl3OfMymMZICFxO4X7u7Kssrg/ZTYk QwPA== ARC-Authentication-Results: i=1; gmr-mx.google.com; spf=pass (google.com: domain of jan.kiszka@siemens.com designates 192.35.17.28 as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com Return-Path: Received: from goliath.siemens.de (goliath.siemens.de. [192.35.17.28]) by gmr-mx.google.com with ESMTPS id q10-v6si858640lji.4.2018.12.05.04.14.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Dec 2018 04:14:56 -0800 (PST) Received-SPF: pass (google.com: domain of jan.kiszka@siemens.com designates 192.35.17.28 as permitted sender) client-ip=192.35.17.28; Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of jan.kiszka@siemens.com designates 192.35.17.28 as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com Received: from mail2.sbs.de (mail2.sbs.de [192.129.41.66]) by goliath.siemens.de (8.15.2/8.15.2) with ESMTPS id wB5CEtqm009969 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 5 Dec 2018 13:14:55 +0100 Received: from [139.25.68.37] (md1q0hnc.ad001.siemens.net [139.25.68.37] (may be forged)) by mail2.sbs.de (8.15.2/8.15.2) with ESMTP id wB5CEsAH032748; Wed, 5 Dec 2018 13:14:54 +0100 Subject: Re: [PATCH 0/3] umount fixes and cleanups To: "Maxim Yu. Osipov" , isar-users Cc: Cedric Hombourger References: From: Jan Kiszka Message-ID: <02edaac4-fc2d-44ea-6471-52ad8fc3d421@siemens.com> Date: Wed, 5 Dec 2018 13:14:54 +0100 User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-TUID: scLmzQnWYn6+ On 05.12.18 12:12, Maxim Yu. Osipov wrote: > On 12/5/18 12:29 PM, Jan Kiszka wrote: >> Patches related to resolving the pending CI issues as well as >> simplifying the umounts used during cleanup. > > Tried to run in patch queue: > > 027b7cf Remove redundant recursive umounts > c1bdc33 isar-events: Improve umount handler > b354273 ci: Wait for bitbake worker to finish before deleting artifacts > 9cf29e6 isar-bootstrap: Fix and cleanup bind mounting > b354026 isar-image: umount base-apt when doing offline build > e965c0d gitlab-ci: Switch to ci_build.sh > ... > > After execution of problematic test case (I rebooted PC and executed steps in > clean tree): > > my stretch Debian system was entered into unusable state > as many important mounts were disappeared (see log of mount points > before and after execution  of last command attached). OK, so I took the time and extracted the root cause. We may see a Debian 4.9 kernel bug here: # mkdir my-mnt # mount --rbind /sys my-mnt # mount --make-rslave my-mnt # umount {-R,-l,-R -l} my-mnt # rmdir my-mnt rmdir: failed to remove 'my-mnt': Device or resource busy This works fine on my Leap 15.0 kernel (4.12) as well as the 4.4 kernel (Ubuntu) used on our CI server. *This* is information we can base commits on. Also, we can file a bug against Debian with this. Could you do that (keep my in CC)? Thanks, Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux