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Subject: kern/11821: /dev/fd0a hangs on large files, including panic: vinvalbuf: dirty bufs
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>Number:         11821
>Category:       kern
>Synopsis:       /dev/fd0a hangs on large files, including panic: vinvalbuf: dirty bufs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 21 09:40:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Pierre Beyssac
>Release:        FreeBSD 4.0-CURRENT i386
>Organization:
ENST
>Environment:

4.0-CURRENT

Boot messages :
	fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f7 irq 6 drq 2 on isa0
	fdc0: FIFO enabled, 8 bytes threshold
	fd0: <1440-KB 3.5" drive> at fdc0 drive 0

Kernel :
	controller      isa0    
	controller      pnp0
	controller      pci0
	controller      fdc0    at isa? port "IO_FD1" irq 6 drq 2
	disk            fd0     at fdc0 drive 0 
	disk            fd1     at fdc0 drive 1

>Description:

Writing a file bigger than 1440Kb (for example, boot.flp from
3.2-RELEASE) to a 1440Kb disk on /dev/fd0a hangs or panics the
system.

>How-To-Repeat:

Generally hangs the system without a message:
	dd if=boot.flp of=/dev/fd0a bs=38k

On the other hand,
	dd if=boot.flp of=/dev/fd0a
nicely returns an error message, but panics (tried only once) if followed by:
	dd if=boot.flp of=/dev/fd0a bs=38k

The panic is:
	vinvalbuf: dirty bufs

>Fix:

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


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