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ICorProfilerCallback GC related behavior changed in CoreCLR 8.0? #106543

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viewizard opened this issue Aug 16, 2024 · 4 comments
Closed

ICorProfilerCallback GC related behavior changed in CoreCLR 8.0? #106543

viewizard opened this issue Aug 16, 2024 · 4 comments
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area-Diagnostics-coreclr question Answer questions and provide assistance, not an issue with source code or documentation.
Milestone
10.0.0

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@viewizard
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During investigation issue in our managed profiler with CoreCLR 8.0, I found, that start from CoreCLR 8.0 we have different behavior for ICorProfilerCallback::ObjectReferences, ICorProfilerCallback::RootReferences and ICorProfilerCallback2::SurvivingReferences.
Tested on Linux amd64/arm64/arm32.

I made simple profiler based on https://github.com/dotnet/samples/tree/main/core/profiling
that log all data we need for testing, here is sources: profiling.zip

and simple application:

using System;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
		GC.Collect();
        }
    }
}

In case CoreCLR 7.0 or prevous versions, we have all ICorProfilerCallback::ObjectReferences and ICorProfilerCallback::RootReferences refs inside surviving ranges provided by ICorProfilerCallback2::SurvivingReferences.
In this case my simple profiler provide log like this:

GarbageCollectionStarted numRanges=5 numRanges2=5 cGenerations=5
GarbageCollectionStarted ranges[i].generation=4 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140485091913728 rangeLength=17440
GarbageCollectionStarted ranges[i].generation=3 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140484957696000 rangeLength=24
GarbageCollectionStarted ranges[i].generation=2 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140484689260544 rangeLength=24
GarbageCollectionStarted ranges[i].generation=1 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140484689260568 rangeLength=24
GarbageCollectionStarted ranges[i].generation=0 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140484689260592 rangeLength=47592
SurvivingReferences rangeStart=140485091913752 rangeLength=17416
SurvivingReferences rangeStart=140484689260616 rangeLength=160
SurvivingReferences rangeStart=140484689260968 rangeLength=480
SurvivingReferences rangeStart=140484689261448 rangeLength=48
SurvivingReferences rangeStart=140484689261496 rangeLength=888
SurvivingReferences rangeStart=140484689262408 rangeLength=3560
SurvivingReferences rangeStart=140484689266128 rangeLength=2456
SurvivingReferences rangeStart=140484689268608 rangeLength=36480
SurvivingReferences rangeStart=140484689305120 rangeLength=120
SurvivingReferences rangeStart=140484689305376 rangeLength=2272
SurvivingReferences rangeStart=140484689307672 rangeLength=512
RootReferences rootRefId=140484689303712 rootRefIdsClassId=140485633932448
RootReferences rootRefId=140484689303712 rootRefIdsClassId=140485633932448
RootReferences rootRefId=140484689303712 rootRefIdsClassId=140485633932448
RootReferences rootRefId=140484689305624 rootRefIdsClassId=140485633946208
RootReferences rootRefId=140484689307112 rootRefIdsClassId=140485634052552
RootReferences rootRefId=140484689266904 rootRefIdsClassId=140485633800960
RootReferences rootRefId=140484689266872 rootRefIdsClassId=140485633800960
RootReferences rootRefId=140485091922984 rootRefIdsClassId=140485633093904
RootReferences rootRefId=140485091921936 rootRefIdsClassId=140485633093904
RootReferences rootRefId=140484689261320 rootRefIdsClassId=140485633831168
RootReferences rootRefId=140484689261192 rootRefIdsClassId=140485633830912
RootReferences rootRefId=140484689261064 rootRefIdsClassId=140485633830656
RootReferences rootRefId=140484689260744 rootRefIdsClassId=140485633800960
RootReferences rootRefId=140484689260712 rootRefIdsClassId=140485633800960
RootReferences rootRefId=140484689260616 rootRefIdsClassId=140485633802368
RootReferences rootRefId=140485091913752 rootRefIdsClassId=140485633093904
RootReferences rootRefId=140484689261448 rootRefIdsClassId=140485633069736
RootReferences rootRefId=140484689308056 rootRefIdsClassId=140485634041088
RootReferences rootRefId=140484689307944 rootRefIdsClassId=140485634041088
ObjectReferences objectId=140484689260744 classId=140485633800960 objectRefId=140484689266288 objectRefClassId=140485633093904
ObjectReferences objectId=140484689261496 classId=140485633845544 objectRefId=140484689261960 objectRefClassId=140485633802368
ObjectReferences objectId=140484689261496 classId=140485633845544 objectRefId=140484689262032 objectRefClassId=140485633861792
ObjectReferences objectId=140484689261496 classId=140485633845544 objectRefId=140484689262320 objectRefClassId=140485633863464
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689266584 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689266720 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689266752 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689266816 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689267088 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689267136 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689267376 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689267448 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689267864 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689267944 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689268112 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689261472 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689268184 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689261472 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689268248 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689268328 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689268504 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262032 classId=140485633861792 objectRefId=140484689268608 objectRefClassId=140485633823456
ObjectReferences objectId=140484689262320 classId=140485633863464 objectRefId=140484689265568 objectRefClassId=140485633870664
ObjectReferences objectId=140484689265592 classId=140485633863464 objectRefId=140484689265616 objectRefClassId=140485633872784
ObjectReferences objectId=140484689265640 classId=140485633863784 objectRefId=140484689265664 objectRefClassId=140485633873424
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689266128 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689265928 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689265808 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689265888 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689266544 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689265728 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689266248 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689260968 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689266208 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689265768 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689266168 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689265688 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689261016 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266288 classId=140485633093904 objectRefId=140484689265848 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266904 classId=140485633800960 objectRefId=140484689266976 objectRefClassId=140485633093904
ObjectReferences objectId=140484689266976 classId=140485633093904 objectRefId=140484689266936 objectRefClassId=140485633801160
ObjectReferences objectId=140484689266976 classId=140485633093904 objectRefId=140484689308120 objectRefClassId=140485633801160
ObjectReferences objectId=140484689303496 classId=140485633932448 objectRefId=140484689303528 objectRefClassId=140485633823456
ObjectReferences objectId=140484689304640 classId=140485633952064 objectRefId=140484689304704 objectRefClassId=140485634033528
ObjectReferences objectId=140484689304728 classId=140485633953984 objectRefId=140484689304864 objectRefClassId=140485634034224
ObjectReferences objectId=140484689304728 classId=140485633953984 objectRefId=140484689304640 objectRefClassId=140485633952064
ObjectReferences objectId=140484689304896 classId=140485633952064 objectRefId=140484689304704 objectRefClassId=140485634033528
ObjectReferences objectId=140484689304960 classId=140485633953984 objectRefId=140484689305000 objectRefClassId=140485634034224
ObjectReferences objectId=140484689304960 classId=140485633953984 objectRefId=140484689304896 objectRefClassId=140485633952064
ObjectReferences objectId=140484689305032 classId=140485633958232 objectRefId=140484689305120 objectRefClassId=140485634034968
ObjectReferences objectId=140484689305160 classId=140485633964304 objectRefId=140484689305568 objectRefClassId=140485633802368
ObjectReferences objectId=140484689305160 classId=140485633964304 objectRefId=140484689305376 objectRefClassId=140485634035968
ObjectReferences objectId=140484689305376 classId=140485634035968 objectRefId=140484689304480 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305376 classId=140485634035968 objectRefId=140484689304568 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305376 classId=140485634035968 objectRefId=140484689304592 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305376 classId=140485634035968 objectRefId=140484689304616 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305376 classId=140485634035968 objectRefId=140484689304456 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305376 classId=140485634035968 objectRefId=140484689304536 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305376 classId=140485634035968 objectRefId=140484689304504 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305624 classId=140485633946208 objectRefId=140484689306008 objectRefClassId=140485633823456
ObjectReferences objectId=140484689305624 classId=140485633946208 objectRefId=140484689306776 objectRefClassId=140485634039592
ObjectReferences objectId=140484689305624 classId=140485633946208 objectRefId=140484689306976 objectRefClassId=140485634039592
ObjectReferences objectId=140484689305624 classId=140485633946208 objectRefId=140484689306744 objectRefClassId=140485634040864
ObjectReferences objectId=140484689305624 classId=140485633946208 objectRefId=140484689306064 objectRefClassId=140485634036488
ObjectReferences objectId=140484689306064 classId=140485634036488 objectRefId=140484689306088 objectRefClassId=140485634036688
ObjectReferences objectId=140484689306776 classId=140485634039592 objectRefId=140484689306888 objectRefClassId=140485634037984
ObjectReferences objectId=140484689306776 classId=140485634039592 objectRefId=140484689306912 objectRefClassId=140485634041088
ObjectReferences objectId=140484689306776 classId=140485634039592 objectRefId=140484689306008 objectRefClassId=140485633823456
ObjectReferences objectId=140484689306776 classId=140485634039592 objectRefId=140484689305624 objectRefClassId=140485633946208
ObjectReferences objectId=140484689306912 classId=140485634041088 objectRefId=140484689306776 objectRefClassId=140485634039592
ObjectReferences objectId=140484689306976 classId=140485634039592 objectRefId=140484689307088 objectRefClassId=140485634037480
ObjectReferences objectId=140484689306976 classId=140485634039592 objectRefId=140484689308056 objectRefClassId=140485634041088
ObjectReferences objectId=140484689306976 classId=140485634039592 objectRefId=140484689306008 objectRefClassId=140485633823456
ObjectReferences objectId=140484689306976 classId=140485634039592 objectRefId=140484689305624 objectRefClassId=140485633946208
ObjectReferences objectId=140484689307112 classId=140485634052552 objectRefId=140484689307296 objectRefClassId=140485633823456
ObjectReferences objectId=140484689307112 classId=140485634052552 objectRefId=140484689307512 objectRefClassId=140485634039592
ObjectReferences objectId=140484689307112 classId=140485634052552 objectRefId=140484689307736 objectRefClassId=140485634039592
ObjectReferences objectId=140484689307112 classId=140485634052552 objectRefId=140484689306744 objectRefClassId=140485634040864
ObjectReferences objectId=140484689307112 classId=140485634052552 objectRefId=140484689307384 objectRefClassId=140485634036488
ObjectReferences objectId=140484689307384 classId=140485634036488 objectRefId=140484689307408 objectRefClassId=140485634036688
ObjectReferences objectId=140484689307512 classId=140485634039592 objectRefId=140484689307624 objectRefClassId=140485634037984
ObjectReferences objectId=140484689307512 classId=140485634039592 objectRefId=140484689307672 objectRefClassId=140485634041088
ObjectReferences objectId=140484689307512 classId=140485634039592 objectRefId=140484689307296 objectRefClassId=140485633823456
ObjectReferences objectId=140484689307512 classId=140485634039592 objectRefId=140484689307112 objectRefClassId=140485634052552
ObjectReferences objectId=140484689307672 classId=140485634041088 objectRefId=140484689307512 objectRefClassId=140485634039592
ObjectReferences objectId=140484689307736 classId=140485634039592 objectRefId=140484689307848 objectRefClassId=140485634037480
ObjectReferences objectId=140484689307736 classId=140485634039592 objectRefId=140484689307944 objectRefClassId=140485634041088
ObjectReferences objectId=140484689307736 classId=140485634039592 objectRefId=140484689307296 objectRefClassId=140485633823456
ObjectReferences objectId=140484689307736 classId=140485634039592 objectRefId=140484689307112 objectRefClassId=140485634052552
ObjectReferences objectId=140484689307872 classId=140485634045424 objectRefId=140484689307904 objectRefClassId=140485634052760
ObjectReferences objectId=140484689307904 classId=140485634052760 objectRefId=140484689308032 objectRefClassId=140485634042360
ObjectReferences objectId=140484689307904 classId=140485634052760 objectRefId=140484689308160 objectRefClassId=140485634042360
ObjectReferences objectId=140484689307944 classId=140485634041088 objectRefId=140484689307736 objectRefClassId=140485634039592
ObjectReferences objectId=140484689308056 classId=140485634041088 objectRefId=140484689306976 objectRefClassId=140485634039592
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689303496 objectRefClassId=140485633932448
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689261472 objectRefClassId=140485633823456
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689261496 objectRefClassId=140485633845544
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689306712 objectRefClassId=140485633944648
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689265616 objectRefClassId=140485633872784
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689265664 objectRefClassId=140485633873424
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689262408 objectRefClassId=140485633802368
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689307112 objectRefClassId=140485634052552
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689306744 objectRefClassId=140485634040864
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689307872 objectRefClassId=140485634045424
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689305624 objectRefClassId=140485633946208
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689304728 objectRefClassId=140485633953984
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689304960 objectRefClassId=140485633953984
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689305032 objectRefClassId=140485633958232
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689305160 objectRefClassId=140485633964304
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689304704 objectRefClassId=140485634033528
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689261648 objectRefClassId=140485633802368
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689262320 objectRefClassId=140485633863464
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689265592 objectRefClassId=140485633863464
ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689265640 objectRefClassId=140485633863784
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ObjectReferences objectId=140485091913752 classId=140485633093904 objectRefId=140484689305064 objectRefClassId=140485634034968
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ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689261576 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689303736 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689303784 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689303816 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689303928 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304032 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304080 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304144 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304176 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304328 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304456 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304480 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304504 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304536 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304568 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304592 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304616 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304768 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689304800 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306008 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306192 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306280 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306320 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306352 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306416 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306480 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306544 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689306584 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689307296 objectRefClassId=140485633823456
ObjectReferences objectId=140485091921936 classId=140485633093904 objectRefId=140484689308008 objectRefClassId=140485633823456
ObjectReferences objectId=140485091922984 classId=140485633093904 objectRefId=140484689262344 objectRefClassId=140485633085152
ObjectReferences objectId=140485091922984 classId=140485633093904 objectRefId=140484689265528 objectRefClassId=140485633085152

but in case CoreCLR 8.0 and CoreCLR 9.0 preview, some objects or root references could be out of surviving references ranges:

GarbageCollectionStarted numRanges=5 numRanges2=5 cGenerations=5
GarbageCollectionStarted ranges[i].generation=4 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140235111399464 rangeLength=8184
GarbageCollectionStarted ranges[i].generation=3 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140235157536808 rangeLength=0
GarbageCollectionStarted ranges[i].generation=2 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140235144953896 rangeLength=0
GarbageCollectionStarted ranges[i].generation=1 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140235149148200 rangeLength=0
GarbageCollectionStarted ranges[i].generation=0 generationCollected[ranges[i].generation]=1
GarbageCollectionStarted rangeStart=140235153342504 rangeLength=43968
SurvivingReferences rangeStart=140235111399464 rangeLength=8184
SurvivingReferences rangeStart=140235153342504 rangeLength=480
SurvivingReferences rangeStart=140235153342984 rangeLength=104
SurvivingReferences rangeStart=140235153343088 rangeLength=360
SurvivingReferences rangeStart=140235153343472 rangeLength=5160
SurvivingReferences rangeStart=140235153348656 rangeLength=35776
SurvivingReferences rangeStart=140235153384464 rangeLength=120
SurvivingReferences rangeStart=140235153384720 rangeLength=1752
RootReferences rootRefId=140235153383896 rootRefIdsClassId=140510395624128
RootReferences rootRefId=140235153383896 rootRefIdsClassId=140510395624128
RootReferences rootRefId=140235153383896 rootRefIdsClassId=140510395624128
RootReferences rootRefId=140235153384968 rootRefIdsClassId=140510395788224
RootReferences rootRefId=140235153385856 rootRefIdsClassId=140510395805448
RootReferences rootRefId=140235153386272 rootRefIdsClassId=140510395792352
RootReferences rootRefId=140235153385632 rootRefIdsClassId=140510395792352
RootReferences rootRefId=140235153385696 rootRefIdsClassId=140510395790904
RootReferences rootRefId=140235153386336 rootRefIdsClassId=140510395790904
RootReferences rootRefId=140235153342856 rootRefIdsClassId=140510394972136
RootReferences rootRefId=140235153342728 rootRefIdsClassId=140510394971880
RootReferences rootRefId=140235153342600 rootRefIdsClassId=140510394971624
RootReferences rootRefId=140235153342504 rootRefIdsClassId=140510394943968
RootReferences rootRefId=140235111399464 rootRefIdsClassId=140510394236768
RootReferences rootRefId=140235153342984 rootRefIdsClassId=140510394211016
ObjectReferences objectId=140235153343008 classId=140510395577752 objectRefId=140235153343088 objectRefClassId=140510394943968
ObjectReferences objectId=140235153343008 classId=140510395577752 objectRefId=140235153343160 objectRefClassId=140510395596064
ObjectReferences objectId=140235153343008 classId=140510395577752 objectRefId=140235153346616 objectRefClassId=140510395608560
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153346736 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153346800 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153346840 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153346904 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153346960 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153347120 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153347152 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153347200 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153347432 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153347504 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153347912 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153347992 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153348160 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140510350970888 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350970888 not in surviving range
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153348232 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140510350970888 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350970888 not in surviving range
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153348296 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153348376 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153348552 objectRefClassId=140510394963912
ObjectReferences objectId=140235153343160 classId=140510395596064 objectRefId=140235153348656 objectRefClassId=140510394963912
ObjectReferences objectId=140235153346616 classId=140510395608560 objectRefId=140235153346592 objectRefClassId=140510395603792
ObjectReferences objectId=140235153346640 classId=140510395608560 objectRefId=140235153346664 objectRefClassId=140510395610616
ObjectReferences objectId=140235153346688 classId=140510395608880 objectRefId=140235153346712 objectRefClassId=140510395611256
ObjectReferences objectId=140235153383864 classId=140510395624128 objectRefId=140235153383920 objectRefClassId=140510394963912
ObjectReferences objectId=140235153384104 classId=140510395767952 objectRefId=140235153384168 objectRefClassId=140510395783848
ObjectReferences objectId=140235153384192 classId=140510395769872 objectRefId=140235153384232 objectRefClassId=140510395784552
ObjectReferences objectId=140235153384192 classId=140510395769872 objectRefId=140235153384104 objectRefClassId=140510395767952
ObjectReferences objectId=140235153384264 classId=140510395767952 objectRefId=140235153384168 objectRefClassId=140510395783848
ObjectReferences objectId=140235153384328 classId=140510395769872 objectRefId=140235153384368 objectRefClassId=140510395784552
ObjectReferences objectId=140235153384328 classId=140510395769872 objectRefId=140235153384264 objectRefClassId=140510395767952
ObjectReferences objectId=140235153384400 classId=140510395774160 objectRefId=140235153384464 objectRefClassId=140510395786168
ObjectReferences objectId=140235153384504 classId=140510395780240 objectRefId=140235153384912 objectRefClassId=140510394943968
ObjectReferences objectId=140235153384504 classId=140510395780240 objectRefId=140235153384720 objectRefClassId=140510395787176
ObjectReferences objectId=140235153384720 classId=140510395787176 objectRefId=140510350971312 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971312 not in surviving range
ObjectReferences objectId=140235153384720 classId=140510395787176 objectRefId=140510350971424 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971424 not in surviving range
ObjectReferences objectId=140235153384720 classId=140510395787176 objectRefId=140510350971448 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971448 not in surviving range
ObjectReferences objectId=140235153384720 classId=140510395787176 objectRefId=140510350971472 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971472 not in surviving range
ObjectReferences objectId=140235153384720 classId=140510395787176 objectRefId=140510350971336 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971336 not in surviving range
ObjectReferences objectId=140235153384720 classId=140510395787176 objectRefId=140510350971392 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971392 not in surviving range
ObjectReferences objectId=140235153384720 classId=140510395787176 objectRefId=140510350971360 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971360 not in surviving range
ObjectReferences objectId=140235153384968 classId=140510395788224 objectRefId=140510350971552 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971552 not in surviving range
ObjectReferences objectId=140235153384968 classId=140510395788224 objectRefId=140235153385528 objectRefClassId=140510395792352
ObjectReferences objectId=140235153384968 classId=140510395788224 objectRefId=140235153385632 objectRefClassId=140510395792352
ObjectReferences objectId=140235153384968 classId=140510395788224 objectRefId=140235153385496 objectRefClassId=140510395794400
ObjectReferences objectId=140235153384968 classId=140510395788224 objectRefId=140235153385368 objectRefClassId=140510395788528
ObjectReferences objectId=140235153385368 classId=140510395788528 objectRefId=140235153385392 objectRefClassId=140510395788728
ObjectReferences objectId=140235153385528 classId=140510395792352 objectRefId=140235153385592 objectRefClassId=140510395789608
ObjectReferences objectId=140235153385528 classId=140510395792352 objectRefId=140510350971552 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971552 not in surviving range
ObjectReferences objectId=140235153385528 classId=140510395792352 objectRefId=140235153384968 objectRefClassId=140510395788224
ObjectReferences objectId=140235153385632 classId=140510395792352 objectRefId=140235153385696 objectRefClassId=140510395790904
ObjectReferences objectId=140235153385632 classId=140510395792352 objectRefId=140510350971552 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971552 not in surviving range
ObjectReferences objectId=140235153385632 classId=140510395792352 objectRefId=140235153384968 objectRefClassId=140510395788224
ObjectReferences objectId=140235153385696 classId=140510395790904 objectRefId=140235153385760 objectRefClassId=140510395793888
ObjectReferences objectId=140235153385784 classId=140510395797768 objectRefId=140235153385816 objectRefClassId=140510395800344
ObjectReferences objectId=140235153385816 classId=140510395800344 objectRefId=140235153386424 objectRefClassId=140510395794688
ObjectReferences objectId=140235153385816 classId=140510395800344 objectRefId=140235153386448 objectRefClassId=140510395794688
ObjectReferences objectId=140235153385856 classId=140510395805448 objectRefId=140510350971880 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971880 not in surviving range
ObjectReferences objectId=140235153385856 classId=140510395805448 objectRefId=140235153386168 objectRefClassId=140510395792352
ObjectReferences objectId=140235153385856 classId=140510395805448 objectRefId=140235153386272 objectRefClassId=140510395792352
ObjectReferences objectId=140235153385856 classId=140510395805448 objectRefId=140235153385496 objectRefClassId=140510395794400
ObjectReferences objectId=140235153385856 classId=140510395805448 objectRefId=140235153386040 objectRefClassId=140510395788528
ObjectReferences objectId=140235153386040 classId=140510395788528 objectRefId=140235153386064 objectRefClassId=140510395788728
ObjectReferences objectId=140235153386168 classId=140510395792352 objectRefId=140235153386232 objectRefClassId=140510395789608
ObjectReferences objectId=140235153386168 classId=140510395792352 objectRefId=140510350971880 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971880 not in surviving range
ObjectReferences objectId=140235153386168 classId=140510395792352 objectRefId=140235153385856 objectRefClassId=140510395805448
ObjectReferences objectId=140235153386272 classId=140510395792352 objectRefId=140235153386336 objectRefClassId=140510395790904
ObjectReferences objectId=140235153386272 classId=140510395792352 objectRefId=140510350971880 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350971880 not in surviving range
ObjectReferences objectId=140235153386272 classId=140510395792352 objectRefId=140235153385856 objectRefClassId=140510395805448
ObjectReferences objectId=140235153386336 classId=140510395790904 objectRefId=140235153386400 objectRefClassId=140510395793888
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153383864 objectRefClassId=140510395624128
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140510350970888 objectRefClassId=140510394963912
!!! ObjectReferences objectRefId=140510350970888 not in surviving range
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153343008 objectRefClassId=140510395577752
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140510350971848 objectRefClassId=140510395763672
!!! ObjectReferences objectRefId=140510350971848 not in surviving range
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153346664 objectRefClassId=140510395610616
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153346712 objectRefClassId=140510395611256
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153343472 objectRefClassId=140510394943968
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153385856 objectRefClassId=140510395805448
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153385496 objectRefClassId=140510395794400
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153385784 objectRefClassId=140510395797768
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153384968 objectRefClassId=140510395788224
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153384192 objectRefClassId=140510395769872
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153384328 objectRefClassId=140510395769872
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153384400 objectRefClassId=140510395774160
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153384504 objectRefClassId=140510395780240
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153384168 objectRefClassId=140510395783848
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153346616 objectRefClassId=140510395608560
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153346640 objectRefClassId=140510395608560
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153346688 objectRefClassId=140510395608880
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140235153346592 objectRefClassId=140510395603792
ObjectReferences objectId=140235111399464 classId=140510394236768 objectRefId=140510350971528 objectRefClassId=140510395786168
!!! ObjectReferences objectRefId=140510350971528 not in surviving range

I am also worry, why this out of surviving ranges references have so strange addresses (surviving refs are close to 14023xxxxxxxxxx but out of surviving range refs have 14051xxxxxxxxxx, looks like some another "generation", but ICorProfilerCallback2::GarbageCollectionStarted still provide only 5 as usual).

Could you please share more info what were changed in CoreCLR 8.0 GC? Is this proper ICorProfilerCallback behaviour for CoreCLR 8.0?
Looks like some new memory storage was added (like LOH or POH), but ICorProfilerCallback2::GarbageCollectionStarted and ICorProfilerCallback2::SurvivingReferences don't care about it now.

CC @gbalykov
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Could you please share more info what were changed in CoreCLR 8.0 GC? Is this proper ICorProfilerCallback behaviour for CoreCLR 8.0?
Looks like some new memory storage was added (like LOH or POH), but ICorProfilerCallback2::GarbageCollectionStarted and ICorProfilerCallback2::SurvivingReferences don't care about it now.

Adding @cshung @noahfalk for thoughts. I am curious if this is related to NonGC heap work in .NET 8 -dotnet/diagnostics#4156

@tommcdon tommcdon added this to the 10.0.0 milestone Aug 17, 2024
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EgorBo commented Aug 19, 2024

It does look like non-GC objects.

@viewizard we intentionally tried to hide those under new APIs since NonGC heap is not scanned (hence, not reported in survived references) and is not explicitly rooted - it's just a separate heap for immortal objects not controlled by the GC, see https://github.com/dotnet/runtime/blob/main/docs/design/features/NonGC-Heap.md

For Profiler API we introduced two APIs for them:

  1. ICorProfilerInfo14::EnumerateNonGCObjects
  2. ICorProfilerInfo14::GetNonGCHeapBounds

Usage example can be found in this test: https://github.com/dotnet/runtime/blob/main/src/tests/profiler/native/nongcheap/nongcheap.cpp

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@EgorBo thank you! Indeed, that were non-GC objects.

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