From owner-freebsd-hackers@freebsd.org Wed Aug 9 13:46:04 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 73736DCD745 for ; Wed, 9 Aug 2017 13:46:04 +0000 (UTC) (envelope-from 6yearold@gmail.com) Received: from mail-pg0-x22b.google.com (mail-pg0-x22b.google.com [IPv6:2607:f8b0:400e:c05::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4493472B8F for ; Wed, 9 Aug 2017 13:46:04 +0000 (UTC) (envelope-from 6yearold@gmail.com) Received: by mail-pg0-x22b.google.com with SMTP id y129so28321189pgy.4 for ; Wed, 09 Aug 2017 06:46:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=Xcg3lgKP+EqdHL89m1q9nGiq3XXB3GjLhsku/BeWvsw=; b=TECCSLnJQyrXdH0wuKSAyEo4dZZBQCcslkQIMSNmqfCupddMPlbreFaq4wSo6GyGj0 bg7a4yJHjGzW/gLDHpjmvMSVOmMhyB4EAmpX7kIH0nBd8yV1HQRNNh7cAgOWyW+oD6Hw eizEcfqNSriuzXOcrvljzhvHrmmwxWJUwebajCp6gMBwWqjczqJxRqUEhtKK0uYgFHPh o3EAJAXBQibWjKkgD98bRxTXC3XE84OjInHzaL07OKt8PxIjb+sMSeicHC46NE7R+7U9 a1SE1V7gkiAkYqA7j0wvpqE/7zoMsk1y39lyeTbDqYyx21lSJDHl38vCs/nCjZSshZQs 9jUg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=Xcg3lgKP+EqdHL89m1q9nGiq3XXB3GjLhsku/BeWvsw=; b=PiUtWY/33mtFGUAAY5QyvF5A4Tq4ka2LvFkJUMN6+8JiZ8l/Gj6xjYgTihCx7TExRg thHD18QxGFOpaPCs6m+YeyQMqcPNLvhxXqM3uDKT5HTDbdXvmpfTNVutiKI+jLAq5KKt nlD8A72LR7MYIvtbwHcgyIpd7Wuk4x+8Or8dOYUs7e4RlRj+8fM0E1OjE9OXhRUxDiCM YBG9Ql/hC8hVD4PAxjWmDQXke+qtkHeBhg1Q2GLd9XsZbM9rS9YotqdfAZ5ondFaF4u1 +aKS9atdW+bhDifwcJiPN9evPtT+UOeVgYcPXdnnKnSMxRajZhooIQkDhzdoTxz6lXfT /yAQ== X-Gm-Message-State: AHYfb5jPzFHWg+RUmzdSlatGKUomkC9b/X/8X8iMpFR5rZR034UWBVn4 TCMKwLG9soywW8ysaJFSAHoX4K6HWg== X-Received: by 10.99.167.70 with SMTP id w6mr7617405pgo.17.1502286363476; Wed, 09 Aug 2017 06:46:03 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.166.235 with HTTP; Wed, 9 Aug 2017 06:45:33 -0700 (PDT) In-Reply-To: <598ADB65.8060701@grosbein.net> References: <598ADB65.8060701@grosbein.net> From: Gleb Popov <6yearold@gmail.com> Date: Wed, 9 Aug 2017 16:45:33 +0300 Message-ID: Subject: Re: Freebsd 11.0 - system freeze on intensive I/O To: freebsd-hackers Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 13:46:04 -0000 On Wed, Aug 9, 2017 at 12:52 PM, Eugene Grosbein wrote= : > 09.08.2017 14:11, Gautam =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > > Hi, > > > > I raised this topic on freebsd-questions where I suspect a bug caused d= ue > > 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=3Dfreebsd-questions&m=3D150088763825675&w=3D2 > > > > 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 tr= y > to > > reproduce this and collect the needed information - traces etc. > > Swapfile is definitely broken in supported FreeBSD releases, it hangs the > system. > The only known workaround (to me) is not using it. > > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= " > I'm using swap on ZFS, and still see the problem, so this might not be tied to swapfile.