From owner-freebsd-stable@FreeBSD.ORG Mon Jun 29 13:11:09 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 12D6E1065670 for ; Mon, 29 Jun 2009 13:11:09 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: from mail-fx0-f218.google.com (mail-fx0-f218.google.com [209.85.220.218]) by mx1.freebsd.org (Postfix) with ESMTP id 917788FC1D for ; Mon, 29 Jun 2009 13:11:08 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: by mail-fx0-f218.google.com with SMTP id 18so1864799fxm.43 for ; Mon, 29 Jun 2009 06:11:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type:content-transfer-encoding; bh=7tZpDInbSkc+tEG/YN4AoyX8HEzRmHgVNnVmcs9V3Vc=; b=hdIjgQ7QgY3mfw1q3ZO5jn5v5MRtsflt9jycCIxRNgamqVB6y2JuKXpnaZvW9A1Pdm zGdqEGhOnqxL6Q8w8BloWGGZgS5qFu+QEDBfVgbyqWSyHDLM7N/aaQKtUgrxzdfpFqio O/4tmD0O4/miQzrMRMXOYDHfd4p+austLgAPk= 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 :content-transfer-encoding; b=WlcGtLPuGY/cy9VK4IN16PlV+d/wtXBXHDsWGPKxD/51kRz14vdgW5otfwNRU3FgCp 2r+y3cmVn3a1d9tmwpASW1iErMjOlU/PR8nVKVp0C9GKTKLu4TW+eI4IHyQ/OiNK+rFR z1jz3wcIc/wkEJn5NHQs+tlHLLkcvNGYIuJqY= MIME-Version: 1.0 Sender: asmrookie@gmail.com Received: by 10.223.127.4 with SMTP id e4mr4290905fas.100.1246281068182; Mon, 29 Jun 2009 06:11:08 -0700 (PDT) In-Reply-To: References: <3bbf2fe10906290458v3d57441ar44c4ed8f36c957f@mail.gmail.com> Date: Mon, 29 Jun 2009 15:11:08 +0200 X-Google-Sender-Auth: 0d2cf55160d000a9 Message-ID: <3bbf2fe10906290611j683a0ddawbd524e406e832d54@mail.gmail.com> From: Attilio Rao To: pluknet Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: freebsd-stable Subject: Re: [nfs] process locks in "bo_wwait" on 6.4 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Jun 2009 13:11:09 -0000 2009/6/29 pluknet : > 2009/6/29 Attilio Rao : >> 2009/6/29 pluknet : >>> 2009/6/26 pluknet : >>>> 2009/6/26 pluknet : >>>>> Hello. >>>>> >>>>> While building a module on nfs mounted /usr/src >>>>> I got an unkillable process waiting forever in bo_wwait. >>>> >>>> Small note: iface on NFS server has mtu changed from 1500 to 1450. >>>> Can this be a source of the problem? >>> >>> This is 100% reproducible. Lock in the same place. Any hints? >> >> Can you also show the value of ps? >> A precise map of what processes are doing would give an help. >> Also would be useful to printout traces for other threads and not only >> the stucked one. >> > > >From another run: I'm unable to see who would be locking the buffer object in question. Do you have INVARIANT_SUPPORT/INVARIANTS on? What revision of /usr/src/sys/kern/vfs_bio.c are you running with? Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein