Date: Thu, 17 Nov 2005 18:40:17 GMT From: Ivo Janssen <ivo@distributed.net> To: freebsd-amd64@FreeBSD.org Subject: Re: amd64/89202: Kernel crash when accessing filesystem Message-ID: <200511171840.jAHIeHbm048676@freefall.freebsd.org>
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The following reply was made to PR amd64/89202; it has been noted by GNATS.
From: Ivo Janssen <ivo@distributed.net>
To: bug-followup@FreeBSD.org
Cc:
Subject: Re: amd64/89202: Kernel crash when accessing filesystem
Date: Thu, 17 Nov 2005 12:35:20 -0600 (CST)
More information:
In sys/ufs/ffs/ffs_alloc.c we find:
dirsize = fs->fs_avgfilesize * fs->fs_avgfpdir
dirsize is int, so it's an overflow
our crash happened in a mkdir operation indeed
our tunefs reports:
> tunefs: average number of files in a directory: (-s) 64
64 * 64 Mb == 2^32
So if a directory size can only be 4 gb, if we specify that the
avg filesize is 64Mb and the avg number of files is 64, we overflow...
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