msdosfs kernel panic with a broken usb flash drive

Gary Jennejohn gljennjohn at
Sat Feb 19 09:57:30 UTC 2011

On Sat, 19 Feb 2011 12:42:48 +0800
dave jones <s.dave.jones at> wrote:

> Recently I have two broken USB thumb drives. I tried to mount /dev/da0s1
> by using mount_msdosfs /dev/da0s1 /mnt, and I got the kernel panic.
> I tried another broken usb drive, the result is the same, kernel panic.
> I also tried it on Linux using "mount -t /dev/sdb1 /mnt", no panic.
> Does it make sense that mounting broken USB drives would cause the
> kernel panic?
> Any idea how to solve this issue? thank you.

Without back trace from ddb or a kernel crash dump it would a little
difficult for anyone to provide an intelligent answer.

Gary Jennejohn

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