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Date:      Thu, 16 Feb 2017 03:05:03 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-amd64@FreeBSD.org
Subject:   [Bug 217126] reading data from fat32 USB card spontaneously reboots system
Message-ID:  <bug-217126-6-LqXTj3jXAu@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-217126-6@https.bugs.freebsd.org/bugzilla/>
References:  <bug-217126-6@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217126

--- Comment #3 from tcovert+freebsd@sahuagin.net ---
I will give it a go. I didn't see anything on the terminal, just found myse=
lf
at the boot screen.

In my attempt to dd the image, I got 4.1GB out of 32GB and a "device not
configured". My attempt to have the drive show up on my mac was unsuccessfu=
l,
while another SD card would show up fine.

So, I'm now suspecting that there is a data corruption on the SD card. I do=
n't
think it should still be able to reboot my machine, but it may not be somet=
hing
that would be normally expected.

I'm happy to help how I can.=20

I'll turn debug.debugger_on_panic=3D1 and see if I can gather a backtrace. =
I'm
referencing
https://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.ht=
ml
in the hopes that it'll lead me correctly.

FWIW, I've got encrypted swap and zfs underneath the system.=20
> sysctl debug.debugger_on_panic
debug.debugger_on_panic: 1

Indicates that this was already set during my last 3 reboots.
/var/crash only contains
minfree

--=20
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