Re: How to crash a 4.99.69 with nothing but an USB stick...

["Jared D. McNeill" <jmcneill%invisible.ca@localhost>]

Martin S. Weber wrote:
> (NetBSD 4.99.69/i386. 14th of July, GENERIC kernel.)
>
> - Use an MSDOS formatted USB stick.
> - insert stick.
> - mount
> - use the filesystem so the system starts caching (*)
> - sync
> - umount
> - remove the stick. Good chance (but < 100%) the system immediately dies.
>
> - got along in doing so for more than one machine, for more than one stick.
> - similarities: heavy activity on the stick, MSDOS filesystem.
>
> - observance1: sometimes the stick blinks (= access) even after umount.
>  => I thought this shouldn't happen, access to a device after umount??
> - observance2: sometimes the system freezes for some seconds when inserting the 
> stick
>  => I thought this shouldn't happen, bring down a system with sticking in a HUB
>         with a couple of mass storages??
>
> I'd attach the dmesg of the last machine I crashed this way but I don't have
> network so would need to use USB transport risking another crash for which I
> am not in the mood at the very moment.
>
> I don't have the time to play with other USB media and other filesystems
> at the moment as well as with more modern -current's. Have fun!

"Me too". Not right away, but eventually it happens. I'm not sure that 
it's msdosfs specific, and every time I've triggered it I seem to be 
using X at the time so I have yet to catch the panic message.

Cheers,
Jared