From owner-freebsd-hackers@FreeBSD.ORG Tue Nov 30 00:51:52 2010 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1F7551065693; Tue, 30 Nov 2010 00:51:52 +0000 (UTC) (envelope-from artemb@gmail.com) Received: from mail-qw0-f54.google.com (mail-qw0-f54.google.com [209.85.216.54]) by mx1.freebsd.org (Postfix) with ESMTP id A02048FC13; Tue, 30 Nov 2010 00:51:51 +0000 (UTC) Received: by qwg8 with SMTP id 8so4241405qwg.13 for ; Mon, 29 Nov 2010 16:51:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:cc:content-type; bh=jLVqqPA3P+vqMnWUnROK3x17a9X4scFf/CksTI0gSrU=; b=wv4U9s80gC6uLayn7rk1GT5ajwzP6pkETgYAhoIkwX9R0wtkyldQ7rpBAz8IBdwNCy Q27aCXwxP+K3qBHoXNhZ7EX5tncOkx95oPONXfsGYgzr5qknBmuQUKEiafnih3D9+Lfo 2QSrKlEakpj5YTtIWFh8YN4JolE9ci+xxqWhE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=og0L98tVtax0rEI/ywK10i21DynEGhIgaFN9luaM980I+K0w6+qikpvzm6qjRCsJ2m Nq4VJHoujUp+dSiSXdqWLIVkBeIoerYOCT2c/Yazxtfw8t8LoA4haBJBWBWLQqVLH/PY oLqSogiTLhuUUEoTNQhe1CtM6pb0/KYIv3feM= MIME-Version: 1.0 Received: by 10.229.251.1 with SMTP id mq1mr5616570qcb.22.1291078310509; Mon, 29 Nov 2010 16:51:50 -0800 (PST) Sender: artemb@gmail.com Received: by 10.220.177.195 with HTTP; Mon, 29 Nov 2010 16:51:50 -0800 (PST) In-Reply-To: <4CF02B23.7050508@freebsd.org> References: <4CEB6039.2040700@freebsd.org> <4CEBC11F.9000402@freebsd.org> <4CEFBC20.3090407@freebsd.org> <4CF02B23.7050508@freebsd.org> Date: Mon, 29 Nov 2010 16:51:50 -0800 X-Google-Sender-Auth: 3ojR-lwnIxRYooJTzOPW-NoctC4 Message-ID: From: Artem Belevich To: Andriy Gapon Content-Type: text/plain; charset=ISO-8859-1 Cc: freebsd-hackers@freebsd.org, "Robert N. M. Watson" Subject: Re: dtrace/cyclic deadlock X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Nov 2010 00:51:52 -0000 On Fri, Nov 26, 2010 at 1:48 PM, Andriy Gapon wrote: > on 26/11/2010 21:10 Artem Belevich said the following: >> On Fri, Nov 26, 2010 at 5:54 AM, Andriy Gapon wrote: >>>> I will appreciate reviews and testing. >>> >>> Should I wait for any pending comments? >>> Otherwise I am confident enough in the patch to commit it. >> >> Some time back I used to have reproducible crash related to dtrace/cyclic: >> http://unix.derkeiler.com/Mailing-Lists/FreeBSD/current/2008-10/msg00449.html >> >> If you can wait until Tuesday, I'll try to check if the problem is >> still reproducible and whether your patch fixes it. > > Artem, > > thanks a lot! > I am sure in no hurry and I will appreciate your testing! > > -- > Andriy Gapon > Andriy, I was able to reproduce the deadlock with hotkernel during buildworld after only few attempts. After applying your patch on top of stable/8 r215749 the deadlock appears to be gone. --Artem