From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3D77B28F.488933FB@zip.com.au> Date: Thu, 05 Sep 2002 12:37:51 -0700 From: Andrew Morton MIME-Version: 1.0 Subject: Re: 2.5.33-mm3 dbench hang and 2.5.33 page allocation failures References: <1031250156.2799.86.camel@spc9.esa.lanl.gov> <1031253714.1990.116.camel@spc9.esa.lanl.gov> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Steven Cole Cc: linux-mm@kvack.org List-ID: Steven Cole wrote: > > On Thu, 2002-09-05 at 12:22, Steven Cole wrote: > > On Thu, 2002-09-05 at 12:03, Andrew Morton wrote: > > > > That sounds like a race-leading-to-deadlock. Feeding the SYSRQ-T > > > output into ksymoops is about the only way you have of diagnosing that > > > I'm afraid. > > > > I have CONFIG_MAGIC_SYSRQ=y for 2.5.33-mm3, so I'll reboot and try to > > get some useful information. > > It looks like I'll have to set up a serial console to capture anything > useful from sysrq-t. I got 2.5.33-mm1 to hang at dbench 16. The box > responds to sysrq commands, but nothing really happens. I tested > sysrq-s before I stared dbench, and that worked OK. But now even with > sysrq-e and sysrq-i, the system still reports dbench and pdflush with > sysrq-t. And sysrq-s doesn't finish. I managed to save the output of > sysrq-p by typing that into a file manually. I'll have to wait until > the test box recovers from sysrq-b to feed that into ksymoops since I'm > using by test box as the build box now. grr. I run dbench all night, so any insight you can get into this would be appreciated. (I've had a few hangs, but they're due to bust disk drivers, aic7xxx not handling IO errors correctly, etc) > BTW, the note in Documentation/sysrq.txt about not needing to enable > /proc/sys/kernel/sysrq anymore appears to be incorrect. I had to set > this to 1 as it was set to 0 on boot. grep your initscripts. Some distros turn it off by hand. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/