[Bug 271766] dumpfs fails on geli devices: cylinder group checks failed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271766

--- Comment #8 from Andrew "RhodiumToad" Gierth <andrew@tao11.riddles.org.uk> ---
This just got much more serious: in trying to reproduce the bug more easily, I
found that it is possible to panic the system with it; if the alignment of the
user-provided buffer is not merely non-page-aligned, but also not word-aligned
(for some wordsize, I don't yet know what), then:

panic: general protection fault

KDB: stack backtrace:
[...]
#3 0xffffffff807b9467 at trap_fatal+0x387
#4 0xffffffff8079378e at calltrap+0x8
#5 0xffffffff80696c53 at swcr_encdec+0x653
#6 0xffffffff8069635a at swcr_process+0x3a
#7 0xffffffff806942bd at crypto_dispatch+0x15d
#8 0xffffffff8124bab8 at g_eli_crypto_run+0x158
#9 0xffffffff81244c88 at g_eli_worker+0x308

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