From owner-freebsd-bugs  Mon Oct 25 23:30: 4 1999
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Date: Mon, 25 Oct 1999 23:21:15 -0700 (PDT)
From: work@scripty.com
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Subject: kern/14536: kernel panic on 64KB block size ufs filesystem when soft updates enabled
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>Number:         14536
>Category:       kern
>Synopsis:       kernel panic on 64KB block size ufs filesystem when soft updates enabled
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Oct 25 23:30:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Clinton Work
>Release:        FreeBSD 3.3-STABLE
>Organization:
CADVision
>Environment:
FreeBSD nntp.cadvision.com 3.3-STABLE FreeBSD 3.3-STABLE #0: Tue Oct 19 17:07:56 MDT 1999     root@nntp.cadvision.com:/usr/src/sys/compile/NNTP  i386

>Description:
I created an 8gig partition on a SCSI drive for the diablo news server.
I adjusted the file system parameters to 64KB block size, 8KB fragments
to improve performance. I also compiled soft updates into the kernel.
When you try to active soft updates on the filesystem (tunefs -n 
enable /dev/....) the kernel panics right away with a "dirty vbufs"
message. 
>How-To-Repeat:
newfs -b 65536 -f 8192 -i 262144 /dev/rda1s1e
tunefs -n enable /dev/da1s1e
<kernel panic "dirty vbufs">

>Fix:
Use the defaults when creating the filesytems with newfs. Soft
updates work fine with the default 4KB block size.

>Release-Note:
>Audit-Trail:
>Unformatted:


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