Bug 14536

Summary:	kernel panic on 64KB block size ufs filesystem when soft updates enabled
Product:	Base System	Reporter:	work <work>
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	3.3-STABLE
Hardware:	Any
OS:	Any

Description work 1999-10-26 07:30:01 UTC

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.

Fix: 

Use the defaults when creating the filesytems with newfs. Soft
updates work fine with the default 4KB block size.
How-To-Repeat: newfs -b 65536 -f 8192 -i 262144 /dev/rda1s1e
tunefs -n enable /dev/da1s1e
<kernel panic "dirty vbufs">

Comment 1 Mike Barcroft freebsd_committer

2001-07-21 03:24:33 UTC

State Changed
From-To: open->feedback


Does this problem still occur in newer versions of FreeBSD, 
such as 4.3-RELEASE?

Comment 2 Sheldon Hearn freebsd_committer

2002-01-17 16:04:36 UTC

State Changed
From-To: feedback->closed

Automatic feedback timeout.  If additional feedback that warrants 
the re-opening of this PR is available but not included in the 
audit trail, please include the feedback in a reply to this message 
(preserving the Subject line) and ask that the PR be re-opened.