From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 22B853858D32 for ; Mon, 22 Aug 2022 17:30:12 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 22B853858D32 Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-616-4jIfh5lINfO8-h1a0y-l5Q-1; Mon, 22 Aug 2022 13:30:08 -0400 X-MC-Unique: 4jIfh5lINfO8-h1a0y-l5Q-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 88DB93814944; Mon, 22 Aug 2022 17:30:08 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.39.192.199]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 0A304945D9; Mon, 22 Aug 2022 17:30:07 +0000 (UTC) From: Florian Weimer To: Paul Zimmermann via Libc-alpha Subject: Re: glibc-2.36 failure References: Date: Mon, 22 Aug 2022 19:30:06 +0200 In-Reply-To: (Paul Zimmermann via Libc-alpha's message of "Mon, 22 Aug 2022 11:29:10 +0200") Message-ID: <871qt8xk2p.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Aug 2022 17:30:15 -0000 * Paul Zimmermann via Libc-alpha: > Hi, > > is the following failure known for glibc 2.36 make check? > > Summary of test results: > 1 FAIL > 5083 PASS > 78 UNSUPPORTED > 18 XFAIL > 4 XPASS > > FAIL: stdlib/tst-arc4random-thread > > zimmerma@biscotte:/localdisk/zimmerma/glibc-2.36/build$ cat stdlib/tst-arc4random-thread.out > info: outer_threads=8 inner_threads=4 > info: arc4random: minimum of 655360 blob results expected > info: arc4random: 662011 blob results observed > info: arc4random_buf: minimum of 655360 blob results expected > info: arc4random_buf: 655360 blob results observed > info: arc4random_uniform: minimum of 655360 blob results expected > Timed out: killed the child process > Termination time: 2022-08-22T08:57:46.154936205 > Last write to standard output: 2022-08-22T08:57:32.198256849 > > I used ../configure --prefix=/usr, on a AMD EPYC 7282 16-Core Processor, > with gcc version 12.1.0 (Debian 12.1.0-8). What's your kernel version? Earlier ones have a serialized getrandom implementation, I think. Only later versions have per-CPU state and decent scaling across multiple cores. Thanks, Florian