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From: gtc@aloft.att.com (gary.corcoran)
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Date: Sat, 11 Nov 95 16:24:14 EST
Original-From: aloft!gtc (gary.corcoran)
Message-Id: <9511112124.AA01913@stargazer>
Original-To: zeta.org.au!bde, freebsd.org!bugs, aloft!gtc, freebsd.org!jkh
Subject: Re: panic: vm_bounce_alloc during initial installation (writing disk info)
Sender: owner-bugs@freebsd.org
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Thanks for the reply.
Regarding:

>>(10/26 if I recall).  When trying to perform the initial installation on my
>>machine, after going through all the menus to partition and label the disk,
>>when I go to commit the changes to disk, I immediately get the following error
>>message (as seen on the debug screen):
>>vm_bounce_alloc: b_bufsize(0x200) < b_bcount(0x1ff0a400) !!
>
>This might be caused by a negative block number somehow being passed to
>dscheck().  If this happens, then "truncating" the i/o would actually
>expand the i/o to the size of the partition plus the absolute value of
>the negative block number.  Do you have a (BSD) partition of size
>approximately 0x1ff0a400 bytes (500+ MB)?  Negative block numbers are
>used by the file system code but are not supposed to reach device drivers.

I believe you're close to the problem: yes - my BSD partition size *is*
a bit over 500MB.

>Bounce buffers are used because the GENERIC config specifies them and
>the `bt' driver handles all BusLogic devices from isa through pci using
>much the same code - it requests bounce buffer support for all buses.

Okay - that explains that.  Thanks for the info.

Gary
gtc@aloft.att.com