From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 17D35B6FA7 for ; Mon, 6 Jun 2011 13:47:03 +1000 (EST) Subject: Re: 3.0-rc1: powerpc hangs at Kernel virtual memory layout From: Benjamin Herrenschmidt To: Christian Kujau In-Reply-To: References: <1306983467.29297.51.camel@pasglop> <1307000008.29297.59.camel@pasglop> Content-Type: text/plain; charset="UTF-8" Date: Mon, 06 Jun 2011 13:46:51 +1000 Message-ID: <1307332011.2874.5.camel@pasglop> Mime-Version: 1.0 Cc: zajec5@gmail.com, linux ppc dev , LKML List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Sun, 2011-06-05 at 19:11 -0700, Christian Kujau wrote: > On Thu, 2 Jun 2011 at 17:33, Benjamin Herrenschmidt wrote: > > It -looks- to me that something goes wrong in the tty code when a large > > file is piped through a pty, causing the kernel to hang for minutes in > > the workqueue / ldisk flush code. I've just sent an initial report to > > Alan Cox about it and am currently bisecting it. > > This was the "tty vs workqueue oddities" thread, right? FWIW, > 55db4c64eddf37 ("Revert "tty: make receive_buf() return the amout of bytes > received"") seems to have fixed it on this powerpc machine as well. Yup. > With your "ssb: pci: Don't call PCIe specific workarounds on PCI cores" > patch applied, powerpc32 seems to be quite happy with 3.0-rc1+ Good :-) Cheers, Ben.