[Bug 233377] [PowerPC64] Panic during high disk I/O activity

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233377

--- Comment #1 from Mark Johnston <markj at FreeBSD.org> ---
The first step will be to figure out which zone this is.  I think it'll be
tricky to track this down without vmcores to look at, but this patch will give
us a starting point.

diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
index 7d14586a31cd..8087a86584c9 100644
--- a/sys/vm/uma_core.c
+++ b/sys/vm/uma_core.c
@@ -1041,6 +1041,7 @@ void
 zone_drain(uma_zone_t zone)
 {

+       printf("draining zone %s\n", zone->uz_name);
        zone_drain_wait(zone, M_NOWAIT);
 }

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