From owner-freebsd-hackers@freebsd.org Wed Aug 9 08:12:26 2017 Return-Path: Delivered-To: freebsd-hackers@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 44BE2DC61DC for ; Wed, 9 Aug 2017 08:12:26 +0000 (UTC) (envelope-from list@execve.net) Received: from lax012.relay.arandomserver.com (lax012.relay.arandomserver.com [198.252.106.48]) (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 0EF32671E4 for ; Wed, 9 Aug 2017 08:12:25 +0000 (UTC) (envelope-from list@execve.net) Received: from sng001.hawkhost.com ([119.81.196.36]) by se003.arandomserver.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dfL93-0002qB-En for freebsd-hackers@freebsd.org; Wed, 09 Aug 2017 02:11:17 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=execve.net; s=default; h=Content-Type:To:Subject:Message-ID:Date:From:MIME-Version: Sender:Reply-To:Cc:Content-Transfer-Encoding:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=yEODKYFwBzS+9jYBRXxBsHSL28z6HM70+jEXgdRt1tE=; b=llMGiAEHDDZZzDYN1at9lg/VFM o1DlKnIt3Fl8z92Qjp01VGllHq+B6P+PBot+KF9RcYQtuCD8avItBtBlcoXEC2SAcBC+k1YHfAfjy xBHyD7CPQfsW37ypb/3QtxvDE; Received: from mail-vk0-f44.google.com ([209.85.213.44]:36712) by sng001.hawkhost.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89) (envelope-from ) id 1dfL8z-0004eG-EU for freebsd-hackers@freebsd.org; Wed, 09 Aug 2017 15:11:05 +0800 Received: by mail-vk0-f44.google.com with SMTP id u133so22515054vke.3 for ; Wed, 09 Aug 2017 00:11:05 -0700 (PDT) X-Gm-Message-State: AHYfb5gmY9xpAAfoln9s/Sts4i/nRP0uwFnWrj6AVtLbQK6dYb5WDiUV 9i4SAI/XSrDEQ7w35gv4ItQcwLE3eQ== X-Received: by 10.31.99.7 with SMTP id x7mr4575770vkb.91.1502262663193; Wed, 09 Aug 2017 00:11:03 -0700 (PDT) MIME-Version: 1.0 Received: by 10.159.40.136 with HTTP; Wed, 9 Aug 2017 00:11:02 -0700 (PDT) From: Gautam Date: Wed, 9 Aug 2017 12:41:02 +0530 X-Gmail-Original-Message-ID: Message-ID: Subject: Freebsd 11.0 - system freeze on intensive I/O To: freebsd-hackers@freebsd.org X-Originating-IP: 119.81.196.36 X-SpamExperts-Domain: sng001.hawkhost.com X-SpamExperts-Username: relay Authentication-Results: arandomserver.com; auth=pass (login) smtp.auth=relay@sng001.hawkhost.com X-SpamExperts-Outgoing-Class: ham X-SpamExperts-Outgoing-Evidence: Combined (0.17) X-Recommended-Action: accept X-Filter-ID: PqwsvolAWURa0gwxuN3S5YEa3T7JuZT23fGO2rGt3ZiEh/Q2y0dK8jSMLTE55fwqH0Nprjby6XDb qzVlIOQ03kAwPN4M+BNtq20Hh3O6Az9ismS84NPFas3IWADbmzJ9CZryIsNFvaBrlzs70sT7iKmx j3Zz/WM/IwRyPjIHIwBUob/yW30DOJj+Kss2vDc/5SEjKwPh0WkSDfiKvcISYh5e973vehgRRMJd d1x498TEPIrJLOIiaQMIoqwZC1nFGzcWMr0czofRVh8rMXrt/SyLxLEJIkbWABkyXJwBVLal3W+/ PI81P534n3yak4n7EfJL2hMI4yCDSSr/HxDyN5bD8YyxjFtJAz2loLb4we0tFPPhpWPZ07PAOr0y wYIXuCj9wj08m7429e2ZOl/ZXvNM2/zURZVxzSV/eszOttj6AVIvY+ILsI7br1ka/ZVMZg0RCmXs LQSJNPsmBKPgn+7xA5exucQFZoY/QWsFvfiVu34H+eqH7iWBpUrKGrffGcXZKnwjnRMG9jJ/knTt +XiA50wwIMuM3BDtnoPm4HpIizaH26GaoEDwTtnQE6q4ZRNP3CPS3YZT5ODGEA+uOpLZY+4z/dwR ocCZGdc1cl9f9x/pKLS918QV+MmO1bAAEgjXIny51RJ3yyIOVX71wEukYspuIwswojsoiyB8OuXo nV+E7OMXRvgtdyMlnmWi9uF4/xGeHumbSXx1nykjkg3q5Go+y6UPrDLg9O+nbQEat0d9vQKDQuJS Y6oEFeAiQnTIgDfxZ2/WGqYvyOVteVOdo6Dvr8fbMJVJ9/erL6/4IvMfhB2h/z0m0D607pH+pWX8 JH76UCDHe+VBXhtjrZr9RUQzcLUz45TvUuLctG5L8ZHLV0zHQOMuxVjpDkV6 X-Report-Abuse-To: spam@se001.arandomserver.com Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Aug 2017 08:12:26 -0000 Hi, I raised this topic on freebsd-questions where I suspect a bug caused due to swapfile usage on FreeBSD. You could read details in the below thread, but summary is that with using a swapfile (not a swap partition) the system freezes on some single process intensive I/O. This is 100% reproducible. http://marc.info/?l=freebsd-questions&m=150088763825675&w=2 I raised a PR - 220971 ; but there are no backtraces / logs etc. that could possibly help. I would like to help narrow this down, but do not know how. Any suggestions on how to debug a system freeze and what I need to do ? I could then try to reproduce this and collect the needed information - traces etc. Thanks, Gautam