msdosfs kernel panic with a broken usb flash drive

dave jones s.dave.jones at
Sun Feb 20 07:26:29 UTC 2011

Sorry, I don't have a kernel crash dump, but the ddb trace is something like:

The machine is running is 9.0 -current.

On Sat, Feb 19, 2011 at 5:56 PM, Gary Jennejohn  wrote:
> 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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