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Date:      Fri, 24 Sep 1999 10:03:55 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Phil Regnauld <regnauld@ftf.net>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Panic writing to R/O block device (was: Crash with 3.3-RELEASE and dd)
Message-ID:  <19990924100355.B53220@freebie.lemis.com>
In-Reply-To: <19990923164840.53205@ns.int.ftf.net>; from Phil Regnauld on Thu, Sep 23, 1999 at 04:48:40PM %2B0200
References:  <19990923164840.53205@ns.int.ftf.net>

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On Thursday, 23 September 1999 at 16:48:40 +0200, Phil Regnauld wrote:
> I didn't where to send this one:
>
> # dd if=/dev/rwd0a of=/dev/rwd2a bs=1024k conv=notrunc
> dd: /dev/rwd2a: Read-only file system
> 1+0 records in
> 0+0 records out
> 0 bytes transferred in 0.059349 secs (0 bytes/sec)
> # mount
> da0s1a on / (local, read-only, writes: sync 2 async 0)
> # dd if=/dev/wd0a of=/dev/wd2a bs=1024k conv=notrunc
> 195+1 records in
> 195+1 records pout
> a204800000 bytes ntransferred in 2i8.291105 secs (7c239024 bytes/sec:)
>  vinvalbuf: dirty bufs

Yup, I know this problem.  I had to fight it in Vinum, but I didn't
know it was anywhere else as well.  Could you put in a PR, please?  I
don't think you need any more than this info, though you could mention
that I know about the problem.

Greg
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