Shenandoah Degenerated GC huge pause 2

gc.log.2

Trigger: Free (5628M) is below minimum threshold (5632M)
Free: 5628M (475 regions), Max regular: 16384K, Max humongous: 1032192K, External frag: 83%, Internal frag: 25%
Evacuation Reserve: 2816M (176 regions), Max regular: 16384K
2019-01-07T18:02:57.639+0000: 258123.203: [Concurrent resetUsing 25 of 25 workers for concurrent reset
 46G->46G(55G), 13.614 ms]
2019-01-07T18:02:57.657+0000: 258123.220: [Pause Init MarkUsing 25 of 25 workers for init marking
Pacer for Mark. Expected Live: 1626M, Free: 5597M, Non-Taxable: 559M, Alloc Tax Rate: 1.1x
, 2.929 ms]
2019-01-07T18:02:57.660+0000: 258123.223: [Concurrent markingUsing 25 of 25 workers for concurrent marking
 46G->47G(55G), 102.880 ms]
2019-01-07T18:02:57.766+0000: 258123.330: [Pause Final MarkUsing 25 of 25 workers for final marking
Adaptive CSet Selection. Target Free: 5632M, Actual Free: 4338M, Max CSet: 2346M, Min Garbage: 1294M
Collectable Garbage: 44112M (95% of total), 1382M CSet, 2844 CSet regions
Immediate Garbage: 194M (0% of total), 13 regions
Pacer for Evacuation. Used CSet: 45494M, Free: 4925M, Non-Taxable: 492M, Alloc Tax Rate: 22.6x
, 4.172 ms]
2019-01-07T18:02:57.771+0000: 258123.335: [Concurrent cleanup 47G->47G(55G), 0.208 ms]
Free: 4904M (429 regions), Max regular: 16384K, Max humongous: 1048576K, External frag: 80%, Internal frag: 28%
Evacuation Reserve: 2714M (170 regions), Max regular: 16384K
2019-01-07T18:02:57.771+0000: 258123.335: [Concurrent evacuationUsing 25 of 25 workers for concurrent evacuation
 47G->49G(55G), 82.613 ms]
2019-01-07T18:02:57.858+0000: 258123.422: [Pause Init Update RefsPacer for Update Refs. Used: 50871M, Free: 4505M, Non-Taxable: 450M, Alloc Tax Rate: 13.8x
, 0.245 ms]
2019-01-07T18:02:57.859+0000: 258123.422: [Concurrent update referencesUsing 25 of 25 workers for concurrent reference update
 49G->50G(55G), 95.928 ms]
Failed to allocate 2048K
Cancelling GC: Allocation Failure
2019-01-07T18:03:03.153+0000: 258128.717: [Pause Final Update RefsUsing 25 of 25 workers for final reference update
, 2.967 ms]
2019-01-07T18:03:03.156+0000: 258128.720: [Concurrent cleanup 54G->9844M(55G), 0.474 ms]
Free: 43659M (2761 regions), Max regular: 16384K, Max humongous: 40501248K, External frag: 10%, Internal frag: 1%
Evacuation Reserve: 2816M (176 regions), Max regular: 16384K
Pacer for Idle. Initial: 1126M, Alloc Tax Rate: 1.0x
Trigger: Handle Allocation Failure
Free: 43659M (2761 regions), Max regular: 16384K, Max humongous: 40501248K, External frag: 10%, Internal frag: 1%
Evacuation Reserve: 2816M (176 regions), Max regular: 16384K
2019-01-07T18:03:03.163+0000: 258128.726: [Pause Degenerated GC (Outside of Cycle)Using 25 of 25 workers for stw degenerated gc
Pacer for Mark. Expected Live: 1629M, Free: 43659M, Non-Taxable: 4365M, Alloc Tax Rate: 0.1x
Adaptive CSet Selection. Target Free: 5632M, Actual Free: 46432M, Max CSet: 2346M, Min Garbage: 0M
Collectable Garbage: 7774M (94% of total), 556M CSet, 523 CSet regions
Immediate Garbage: 0M (0% of total), 0 regions
Pacer for Evacuation. Used CSet: 8331M, Free: 43623M, Non-Taxable: 4362M, Alloc Tax Rate: 1.1x
Pacer for Update Refs. Used: 10424M, Free: 43623M, Non-Taxable: 4362M, Alloc Tax Rate: 1.1x
Used: before: 9844M, after: 2092M
Internal frag: before: 0.4%, after: 0.4%
External frag: before: 14.9%, after: 16.6%
 9844M->2092M(55G), 178.891 ms]
Free: 51410M (3215 regions), Max regular: 16384K, Max humongous: 46284800K, External frag: 13%, Internal frag: 0%
Evacuation Reserve: 2816M (176 regions), Max regular: 16384K
Pacer for Idle. Initial: 1126M, Alloc Tax Rate: 1.0x