After installing several plugins and doing a safeRestart, Jenkins hangs. I tried a restart using the start/stop scripts to no avail.

I ran the jmap to see if that could tell me anything
> jmap -heap 5199
Attaching to process ID 5199, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.101-b13

using thread-local object allocation.
Parallel GC with 4 thread(s)

Heap Configuration:
MinHeapFreeRatio = 0
MaxHeapFreeRatio = 100
MaxHeapSize = 4123000832 (3932.0MB)
NewSize = 85983232 (82.0MB)
MaxNewSize = 1374158848 (1310.5MB)
OldSize = 171966464 (164.0MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 0 (0.0MB)

Heap Usage:
PS Young Generation
Eden Space:
capacity = 691535872 (659.5MB)
used = 231289400 (220.57476043701172MB)
free = 460246472 (438.9252395629883MB)
33.44575594192748% used
From Space:
capacity = 13107200 (12.5MB)
used = 12778312 (12.186347961425781MB)
free = 328888 (0.31365203857421875MB)
97.49078369140625% used
To Space:
capacity = 26738688 (25.5MB)
used = 0 (0.0MB)
free = 26738688 (25.5MB)
0.0% used
PS Old Generation
capacity = 120061952 (114.5MB)
used = 29336416 (27.977386474609375MB)
free = 90725536 (86.52261352539062MB)
24.434398667781114% used

23550 interned Strings occupying 2059504 bytes.