[Bug 244118] 13-CURRENT Kernel post r357547 hang during boot on PowerMac G5Q

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244118

--- Comment #16 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Mark Millard from comment #15)

The diff:

# more /mnt/root/keg_lines_diff.txt 
--- /root/keg_lines_0.txt       2020-02-15 06:06:11.318230000 +0000
+++ /root/keg_lines_1.txt       2020-02-15 06:06:55.069131000 +0000
@@ -1,3 +1,5 @@
 keg UMA Kegs layout: format 0 (ipers 7 * rsize 512) / slabsize 0x1000 = 87%
eff
+keg UMA Kegs layout: format 0 (ipers 15 * rsize 512) / slabsize 0x2000 = 93%
eff
 keg UMA Zones layout: format 0 (ipers 2 * rsize 1792) / slabsize 0x1000 = 87%
eff
+keg UMA Zones layout: format 0 (ipers 9 * rsize 1792) / slabsize 0x4000 = 98%
eff
 keg UMA Slabs 0 layout: format 0 (ipers 50 * rsize 80) / slabsize 0x1000 = 97%
eff
@@ -26,2 +28,4 @@
 keg VMSPACE layout: format 0 (ipers 2 * rsize 1400) / slabsize 0x1000 = 68%
eff
+keg VMSPACE layout: format 0 (ipers 5 * rsize 1400) / slabsize 0x2000 = 85%
eff
+keg VMSPACE layout: format 0 (ipers 8 * rsize 1400) / slabsize 0x3000 = 91%
eff
 keg UPVO entry layout: format 0 (ipers 42 * rsize 96) / slabsize 0x1000 = 98%
eff
@@ -53,2 +57,3 @@
 keg filedesc0 layout: format 0 (ipers 3 * rsize 1104) / slabsize 0x1000 = 80%
eff
+keg filedesc0 layout: format 0 (ipers 7 * rsize 1104) / slabsize 0x2000 = 94%
eff
 keg rangeset pctrie nodes layout: format 0 (ipers 28 * rsize 144) / slabsize
0x1000 = 98% eff
@@ -62,2 +67,5 @@
 keg THREAD layout: format 0 (ipers 2 * rsize 1376) / slabsize 0x1000 = 67% eff
+keg THREAD layout: format 0 (ipers 5 * rsize 1376) / slabsize 0x2000 = 83% eff
+keg THREAD layout: format 0 (ipers 8 * rsize 1376) / slabsize 0x3000 = 89% eff
+keg THREAD layout: format 0 (ipers 11 * rsize 1376) / slabsize 0x4000 = 92%
eff
 keg cpuset layout: format 0 (ipers 31 * rsize 128) / slabsize 0x1000 = 96% eff
@@ -92,2 +100,3 @@
 keg NCLNODE layout: format 0 (ipers 6 * rsize 592) / slabsize 0x1000 = 86% eff
+keg NCLNODE layout: format 0 (ipers 13 * rsize 592) / slabsize 0x2000 = 93%
eff
 keg DIRHASH layout: format 0 (ipers 3 * rsize 1024) / slabsize 0x1000 = 75%
eff
@@ -101,2 +110,3 @@
 keg Mountpoints layout: format 0 (ipers 1 * rsize 2944) / slabsize 0x1000 =
71% eff
+keg Mountpoints layout: format 0 (ipers 4 * rsize 2944) / slabsize 0x3000 =
95% eff
 keg ksiginfo layout: format 0 (ipers 36 * rsize 112) / slabsize 0x1000 = 98%
eff
@@ -105,2 +115,3 @@
 keg socket layout: format 0 (ipers 4 * rsize 904) / slabsize 0x1000 = 88% eff
+keg socket layout: format 0 (ipers 9 * rsize 904) / slabsize 0x2000 = 99% eff
 keg unpcb layout: format 0 (ipers 15 * rsize 256) / slabsize 0x1000 = 93% eff
@@ -123,4 +134,7 @@
 keg sctp_asoc layout: format 0 (ipers 1 * rsize 2288) / slabsize 0x1000 = 55%
eff
+keg sctp_asoc layout: format 0 (ipers 3 * rsize 2288) / slabsize 0x2000 = 83%
eff
+keg sctp_asoc layout: format 0 (ipers 5 * rsize 2288) / slabsize 0x3000 = 93%
eff
 keg sctp_laddr layout: format 0 (ipers 84 * rsize 48) / slabsize 0x1000 = 98%
eff
 keg sctp_raddr layout: format 0 (ipers 5 * rsize 736) / slabsize 0x1000 = 89%
eff
+keg sctp_raddr layout: format 0 (ipers 11 * rsize 736) / slabsize 0x2000 = 98%
eff
 keg sctp_chunk layout: format 0 (ipers 26 * rsize 152) / slabsize 0x1000 = 96%
eff
@@ -136,2 +150,3 @@
 keg swpctrie layout: format 0 (ipers 28 * rsize 144) / slabsize 0x1000 = 98%
eff
+keg swblk layout: format 0 (ipers 29 * rsize 136) / slabsize 0x1000 = 96% eff
 keg FFS inode layout: format 0 (ipers 25 * rsize 160) / slabsize 0x1000 = 97%
eff

So: swblk missing vs. existing is something I missed, along with originally
missing Mountpoints.

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