Panic with Current 351901 ISO image

From: Curtis Hamilton <clhamilto_at_gmail.com>
Date: Sun, 8 Sep 2019 18:03:09 -0400
I'm encountering (randomly) the below error when trying to install 
351901 from CD/DVD.


timeout stopping cpus
panic: acquiring blockable sleep lock with spinlock or critical section 
held (sleep mutex) vm map (system) _at_ /usr/src/sys/vm/vm_map.c:4066
cpuid = 0
time = 1
KDB: stack backtrace:
0xe00000008879d4f0: at .kdb_backtrace+0x5c
0xe00000008879d620: at .vpanic+0x1b4
0xe00000008879d6e0: at .panic+0x38
0xe00000008879d770: at .witness_checkorder+0xf4
0xe00000008879d860: at .__mtx_lock_flags+0xfc
0xe00000008879d910: at ._vm_map_lock_read+0x34
0xe00000008879d990: at .vm_map_lookup+0x94
0xe00000008879dad0: at .vm_fault_hold+0x158
0xe00000008879dcf0: at .vm_fault+0x94
0xe00000008879dda0: at .cpu_fetch_syscall_args+0x404
0xe00000008879de50: at .trap+0xf28
0xe00000008879e010: at .powerpc_interrupt+0x290
0xe00000008879e0b0: kernel DSI read trap _at_ 0x392 by 
.sched_relinquish+0x290: srr1=0x9000000000001032
r1=0xe00000008879e360 cr=0x20009032 xer=0 ctr=0xc000000002ea198c 
r2=0xc00000000393f7e0 sr=0x40000000
0xe00000008879e360: at .sched_tdname+0xbc
0xe00000008879e3f0: at .sched_switch+0x414
0xe00000008879e530: at .mi_switch+0x2d4
0xe00000008879e5c0: at .sched_bind+0xd8
0xe00000008879e650: at .taskqgroup_config_gtask_init+0x108
0xe00000008879e700: at .gtaskqueue_cancel+0x2ac
0xe00000008879e7c0: at .taskqgroup_adjust+0xb0c
0xe00000008879e850: at .fork_exit+0xd0
0xe00000008879e8f0: at .fork_trampoline+0x10
0xe00000008879e920: at -0x4
KDB: enter: panic
[ thread pid 0 tid 100144 ]
Stopped at .kdb_enter+0x60:        ld      r2, r1, 0x28
db>
Received on Sun Sep 08 2019 - 20:03:13 UTC

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