[Bug 217126] reading data from fat32 USB card spontaneously reboots system

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217126

--- Comment #4 from Conrad Meyer <cem at freebsd.org> ---
> In my attempt to dd the image, I got 4.1GB out of 32GB and a "device not configured".

That's probably ENXIO (the hardware has some issue and disappeared during dd). 
I wouldn't be surprised if this lead to a panic in msdosfs because it doesn't
handle ENXIO errors (failing or removed disks) well.

Or maybe the bad device is causing some other issue.

> I'm referencing https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.html in the hopes that it'll lead me correctly.

If you can get a core, even better.

> FWIW, I've got encrypted swap and zfs underneath the system.

That will make it hard to get a core :-).

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