Path: utzoo!utgpu!watmath!att!mcdchg!ddsw1!karl From: karl@ddsw1.MCS.COM (Karl Denninger) Newsgroups: comp.unix.xenix Subject: Re: 2.3.1 text corruption Summary: Check board placement -- are you using 2 controllers by chance? Message-ID: <3571@ddsw1.MCS.COM> Date: 4 Jun 89 20:08:31 GMT References: <26353@lll-winken.LLNL.GOV> Reply-To: karl@ddsw1.MCS.COM (Karl Denninger) Organization: Macro Computer Solutions, Inc., Mundelein, IL Lines: 35 In article <26353@lll-winken.LLNL.GOV> carlson@lll-winken.LLNL.GOV (Joe Carlson) writes: > > I am experiencing a rather odd corruption problem under XENIX 386 >2.3.1. Basically it appears that the in-core version of certain heavily >used programs appears to get corrupted every once in a while. I believe that >I have eliminated hardware trouble as the cause of this. I wouldn't be so sure. This showed up last night after adding a second controller and disk drive to our system here (2.3.2). The symptoms were 'cc' core dumping with a segmentation violation, wierd unreproducable problems with the tape drive, and even as kernel panic (TRAP in system mode!) I am going to try moving boards around and see if it goes away. We have never seen this one before; it's brand new and just started happening after we added the secondary controller. It may be related to board position; we had to move things around to get the second board in the box, and the system is stuffed now. I will be moving the tape drive controller away from the disk controllers, and in general trying a few things over the next few days. > It appears that there is a text cache kept in the kernel which >has corrupted it's entry for program in question.... rebooting the system >clears the trouble (or making another disk copy as I show above). The problem >appears VERY sporadically and has hit a number of programs on the system >(/bin/sh and /etc/nntpd[one of my own]) that get run a lot. I've seen this happen with the tape drive too; it seems tied to heavy load and secondary controller activity. It's not yet been isolated here, but I will report to the net when we have something more concrete. -- Karl Denninger (karl@ddsw1.MCS.COM, !ddsw1!karl) Public Access Data Line: [+1 312 566-8911], Voice: [+1 312 566-8910] Macro Computer Solutions, Inc. "Quality Solutions at a Fair Price"