From patchwork Wed Jan 8 08:45:11 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 13930307 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B6DB5E77188 for ; Wed, 8 Jan 2025 08:47:35 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tVRhO-00068K-M0; Wed, 08 Jan 2025 03:45:58 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tVRhE-00065u-In for qemu-devel@nongnu.org; Wed, 08 Jan 2025 03:45:52 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tVRhD-0001nw-4l for qemu-devel@nongnu.org; Wed, 08 Jan 2025 03:45:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1736325946; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Z/gZ7r+bKf/0wluMqP3o0zZbo3EYAyCdRG9VumB6Zb8=; b=KI+5uJ+pgyfTNRfnI2F6LuNNa4yxcLqeOquLamie32i3zgxSndat2Nq+OU2ZhDngtxRAJb QviyEb7tpHXe05R0s8HWel5aT36KEnLnRK3aqE8xLwXfnA1e3BU2UFypHNphUhjpRxSrDv Bu+GeJvw63gBsf37Q8OeWPgUZnmI0ng= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-491-V1VpwcilOWqxUxACLJ6w_Q-1; Wed, 08 Jan 2025 03:45:45 -0500 X-MC-Unique: V1VpwcilOWqxUxACLJ6w_Q-1 X-Mimecast-MFC-AGG-ID: V1VpwcilOWqxUxACLJ6w_Q Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 352A41956083; Wed, 8 Jan 2025 08:45:44 +0000 (UTC) Received: from thuth-p1g4.str.redhat.com (dhcp-192-228.str.redhat.com [10.33.192.228]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 14C9F19560AA; Wed, 8 Jan 2025 08:45:42 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , Stefan Hajnoczi Subject: [PULL 14/14] tests/functional/test_x86_64_hotplug_cpu: Fix race condition during unplug Date: Wed, 8 Jan 2025 09:45:11 +0100 Message-ID: <20250108084511.238458-15-thuth@redhat.com> In-Reply-To: <20250108084511.238458-1-thuth@redhat.com> References: <20250108084511.238458-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.437, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org When unplugging the CPU, the test tries to check for a successful unplug by changing to the /sys/devices/system/cpu/cpu1 directory to see whether that fails. However, the "cd" could be faster than the unplug operation in the kernel, so there is a race condition and the test sometimes fails here. Fix it by trying to change the directory in a loop until the the CPU has really been unplugged. While we're at it, also add a "cd .." before unplugging to make the console output a little bit less confusing (since the path is echoed in the shell prompt). Reported-by: Stefan Hajnoczi Message-ID: <20250107115245.52755-1-thuth@redhat.com> Signed-off-by: Thomas Huth --- tests/functional/test_x86_64_hotplug_cpu.py | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tests/functional/test_x86_64_hotplug_cpu.py b/tests/functional/test_x86_64_hotplug_cpu.py index b1d5156c72..7b9200ac2e 100755 --- a/tests/functional/test_x86_64_hotplug_cpu.py +++ b/tests/functional/test_x86_64_hotplug_cpu.py @@ -59,11 +59,13 @@ def test_hotplug(self): 'cd /sys/devices/system/cpu/cpu1', 'cpu1#') + exec_command_and_wait_for_pattern(self, 'cd ..', prompt) self.vm.cmd('device_del', id='c1') exec_command_and_wait_for_pattern(self, - 'cd /sys/devices/system/cpu/cpu1', - 'No such file or directory') + 'while cd /sys/devices/system/cpu/cpu1 ;' + ' do sleep 0.2 ; done', + 'No such file or directory') if __name__ == '__main__': LinuxKernelTest.main()