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Date: Wed, 28 May 2003 01:50:09 -0700 (PDT)
Message-Id: <200305280850.h4S8o9iT037983@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
From: Aaron Smith <aaron@mutex.org>
Subject: Re: i386/41723: Copying files to filesystem causes "integer divide
	fault" and panic.
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The following reply was made to PR i386/41723; it has been noted by GNATS.

From: Aaron Smith <aaron@mutex.org>
To: freebsd-gnats-submit@FreeBSD.org, kreature@c2i.net,
	freebsd-misuser@dcf77-zeit.netscum.dyndns.dk, bright@mu.org
Cc:  
Subject: Re: i386/41723: Copying files to filesystem causes "integer divide fault" and panic.
Date: Tue, 27 May 2003 20:13:54 -0700

 [apologies for the long URL]
 
 http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&safe=off&threadm=200205261326.g4QDQrC00472%40beerswilling.netscum.dyndns.dk&rnum=1&prev=/groups%3Fq%3Dffs_dirpref%2Bdivide%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26safe%3Doff%26selm%3D200205261326.g4QDQrC00472%2540beerswilling.netscum.dyndns.dk%26rnum%3D1
 
 As indicated in this thread, there is an overflow problem in ffs_dirpref
 for large filesystems. The symptom is an integer divide-by-zero exception
 at ffs_dirpref+0x1e8 (at least on a recent -CURRENT). This bug has been
 around for a year plus. Who else has seen this, and is anyone working on it
 before I do? It looks like it would reliably happen on any large FS for
 which you increase the average file size.
 
 I'm going to go through and change some types to int64_t and see if I can
 get this to stop panicking on my 1TB filesystem. Any advice that would lead
 to less hassle would be much appreciated.
 
 --Aaron