From owner-freebsd-current@freebsd.org Sun Jul 30 14:15:27 2017 Return-Path: Delivered-To: freebsd-current@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 467ACDBC63B for ; Sun, 30 Jul 2017 14:15:27 +0000 (UTC) (envelope-from gergely.czuczy@harmless.hu) Received: from marvin.harmless.hu (marvin.harmless.hu [195.56.55.204]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id EF212731CD; Sun, 30 Jul 2017 14:15:26 +0000 (UTC) (envelope-from gergely.czuczy@harmless.hu) Received: from 188-143-57-203.pool.digikabel.hu ([188.143.57.203] helo=[10.219.16.1]) by marvin.harmless.hu with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.88 (FreeBSD)) (envelope-from ) id 1dbozv-000Bdi-Tr; Sun, 30 Jul 2017 14:15:11 +0000 To: mmacy@mattmacy.io Cc: sbruno@freebsd.org, FreeBSD Current From: Gergely Czuczy Subject: Mbufs leak since r321253 Message-ID: Date: Sun, 30 Jul 2017 16:15:11 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 30 Jul 2017 14:15:27 -0000 Hello, While running some port builds over an NFS-mounted /usr/ports on my aarch64 VM after r321253, I've noticed that sooner or later I'm getting an error saying "kernel: [zone: mbuf_cluster] kern.ipc.nmbclusters limit reached". I've tried increasing the sysctl, but after some time I always got the error. I've checked the mbuf counter with ``netstat -m'' periodically during the build, and noticed that the mbufs in use and mbuf clusters in use are continuously increasing, I've never seen a decrease: 279943/392/280335 mbufs in use (current/cache/total) 130819/253/131072/131072 mbuf clusters in use (current/cache/total/max) According to https://svnweb.freebsd.org/base/head/?view=log&pathrev=321253, the previous commit to HEAD was r321248. I've checked it on that build as well, and I couldn't reproduce the issue, mbuf counters were stable. After getting the kernel error message, the builds got stuck, some processes become unresponsive, and the only way to I was aware to clear the mbufs was to reboot the VM. So far what I know, is building over NFS triggers the leak. However, I haven't tested it with other network activities, might also do the trick. Could you please take a look into it? If any more information is needed, please let me know, I still have my test VMs at hand, I can do a few tests. Best regards, Gergely