From owner-freebsd-hackers@FreeBSD.ORG Sat Oct 27 14:42:25 2007 Return-Path: Delivered-To: hackers@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 4243F16A418; Sat, 27 Oct 2007 14:42:25 +0000 (UTC) (envelope-from danny@cs.huji.ac.il) Received: from cs1.cs.huji.ac.il (cs1.cs.huji.ac.il [132.65.16.10]) by mx1.freebsd.org (Postfix) with ESMTP id EBCC213C480; Sat, 27 Oct 2007 14:42:24 +0000 (UTC) (envelope-from danny@cs.huji.ac.il) Received: from pampa.cs.huji.ac.il ([132.65.80.32]) by cs1.cs.huji.ac.il with esmtp id 1Ilmrn-0007Lq-EU; Sat, 27 Oct 2007 16:42:23 +0200 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: hackers@FreeBSD.org In-reply-to: References: <20070904233246.GA2409@epia-2.farid-hajji.net> <043a01c7f202$a7ad0920$f7071b60$@co.uk> <046801c7f229$a4534510$ecf9cf30$@co.uk> Comments: In-reply-to Danny Braniss message dated "Thu, 18 Oct 2007 13:35:11 +0200." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 27 Oct 2007 16:42:23 +0200 From: Danny Braniss Message-ID: Cc: freebsd-current@FreeBSD.org Subject: Re: dump problems 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: Sat, 27 Oct 2007 14:42:25 -0000 to recap: dump will get stuck/deadlock. found the problem, but no solution in sight :-( dump creates 3 processess and syncs with them via kill(2) - don't want to go into the merrits of this - and sometimes: - the signal is received even if it's blocked. - the signal is not received. - it happens mainly on > 2way multicore hosts. all this seems to be a problem in the kernel. need some insight please! thanks, danny PS: sorry for the shortness of the message, anything else will get me to start %$#@! dump, specially tape.c.