Return-Path: Received: from mail-wm0-f48.google.com ([74.125.82.48]:35466 "EHLO mail-wm0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030311AbcGKNrn (ORCPT ); Mon, 11 Jul 2016 09:47:43 -0400 Received: by mail-wm0-f48.google.com with SMTP id f65so64033639wmi.0 for ; Mon, 11 Jul 2016 06:47:42 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: From: Alexey Dobriyan Date: Mon, 11 Jul 2016 16:47:41 +0300 Message-ID: Subject: Re: RHEL7 hang (and probably mainline) while copying big files because of subrequests merging(?) To: Trond Myklebust Cc: "linux-nfs@vger.kernel.org" , Schumaker Anna , Weston Andros Adamson Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: On Mon, Jul 11, 2016 at 4:28 PM, Trond Myklebust wrote: > >> On Jul 11, 2016, at 08:59, Alexey Dobriyan wrote: >> >> We have a customer who was able to reliably reproduce the following hang: >> (hang itself is rare but there are many machines, so it is not rare) >> >> INFO: task ascp:66692 blocked for more than 120 seconds. > > Why is this being reported here and not to Red Hat? Is the bug reproducible on the upstream kernel? It is not a report per se, more heads up for other folks like CentOS and other rebuilders. I checked every NFS commit since 3.10, there seems to be nothing fixing it. As for testing mainline, I don't know, maybe we can arrange that. Alexey