On Thu, Aug 16, 2012 at 04:28:07PM +0200, Lukáš Czerner wrote:
>
> After a little bit of tracing with the systemtap and blktrace ext4
> does not seem to be doing anything wrong and yet we get part of the
> block bitmap trimmed. This lead me to the scsi_debug driver itself
> and indeed it seems that we have off-by-one bug there in the
> unamp_region() which is causing the problem.
Thanks for finding this --- I was getting scared that ext4 users were
losing data in production. It's good to know it was just a bug in the
scsi_debug driver.
- Ted
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