From owner-freebsd-hackers@freebsd.org Wed Aug 9 08:35:39 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 83B26DC6A2D for ; Wed, 9 Aug 2017 08:35:39 +0000 (UTC) (envelope-from 6yearold@gmail.com) Received: from mail-pf0-x22f.google.com (mail-pf0-x22f.google.com [IPv6:2607:f8b0:400e:c00::22f]) (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 5467D68078 for ; Wed, 9 Aug 2017 08:35:39 +0000 (UTC) (envelope-from 6yearold@gmail.com) Received: by mail-pf0-x22f.google.com with SMTP id h68so25170279pfk.0 for ; Wed, 09 Aug 2017 01:35:39 -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 :cc; bh=ieTLnmq0/h/BnRk1KkSNimYqFprQQZLXZQ3aZHEW5Qw=; b=eq5TRfAsGAq1zsNefHx+6A3hPt0NpnGHtvrWRMgfPLmXAvtkkGBByKRTBKtAHaeEmS UGY+Z4oReSCkXN54koX7FGJt2JgNbCIxNO31QBFpL/0qny2lzx4I1G8o0b3Q2CuFF98F WfN9ZpBtItrC0366djtj7kjc/D8JnWjeM1/QsmWjCyAzggxoQw9tHTPCvzqA4m2C6m2i kGaBTzyHhiECSoU2XFL94JDdroa6KwZFjoKOmeCKLowG/t6abznSceUF7p28Ah5oGTh3 5S6lMJ8sbpp4RYm2lDV2/oUcXkLZx51wmgnm+11FBmThJIMF2qEQcTzYFIRoUXbJ3wHP r2WA== 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:cc; bh=ieTLnmq0/h/BnRk1KkSNimYqFprQQZLXZQ3aZHEW5Qw=; b=jL6+KIrM9aZMzorm0cBTLdZS1ZdYt9YpTETUbaSIFO4JkMJvH2xrl8UWuYcnPL42RW 8Ox2AisVkvdbidaZuZ/pfR0QpRmwPmbcOMKxUBq7F6W1Icq25hUAVbYPZDHzw3Cl5dPX iUFGrR8/A2orqzYssEDWJ5tpZ2hxxK0liQ7m4m2ia3bG9Ch4jU7/qutif9hw11tgEycF mAGNuCgoF6YHoik43o5ET+DoEgI2ItbzW+Od6mUiHjnOBZUdarE2pmWytsXC66zw9Vov UQS3vUx56HfvQxVnMt9lmGRxL55t0nu3yxcTDhrl2Z0MP4wywAQDMRqbigWy1cNUh901 AbIQ== X-Gm-Message-State: AHYfb5jzJVMuYK2q8IG0qDKOl9j/IgzGCak1flSfzJ/EfbNtDIuyl7rV OzTCWy0h38EFcFkdiosIzjkyqQr1sg== X-Received: by 10.98.109.65 with SMTP id i62mr7449632pfc.309.1502267738732; Wed, 09 Aug 2017 01:35:38 -0700 (PDT) MIME-Version: 1.0 Received: by 10.100.166.235 with HTTP; Wed, 9 Aug 2017 01:35:08 -0700 (PDT) In-Reply-To: References: From: Gleb Popov <6yearold@gmail.com> Date: Wed, 9 Aug 2017 11:35:08 +0300 Message-ID: Subject: Re: Freebsd 11.0 - system freeze on intensive I/O To: freebsd-hackers Cc: Gautam 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 08:35:39 -0000 On Wed, Aug 9, 2017 at 10:11 AM, Gautam wrote: > 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 > _______________________________________________ > 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 also see symptoms you mentioned on my system, but I'm using ZFS. But my system is very ancient, so I've been taking it as normal behavior. Like you said, intensive disk IO turns OS completely unresponsive, except pings.