26126 panic system rather than corrupting pool if we hit bug 26100
References:
delphix/delphix-os@931c8aaab74b6412933d299890894262e2ef8380
Ported-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1650