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Thread objects are being leaked #6169

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Therzok opened this issue Dec 6, 2017 · 4 comments
Closed

Thread objects are being leaked #6169

Therzok opened this issue Dec 6, 2017 · 4 comments
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@luhenry
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area-Runtime: Threading

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@Therzok
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@Therzok Therzok commented Dec 6, 2017

Starting a bg thread with new Thread() and starting it with either a parameter or not causes the code to leak the start method (and, if applicable, the start arguments).

The retention path for the parametrized start is GCHandle -> InternalThread -> Thread -> ParametrizedThreadStart -> ThreadHelper -> <thread start parameter object> .

The threads are definitely collectible and leaking, as Thread.Join() successfully passes.
@Therzok
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@Therzok Therzok commented Dec 6, 2017 •
edited

Sample app:
https://gist.github.com/Therzok/ce0dc57b27343019a7b3782ed0cbf9b1

Results on platforms (note the different on where Program Termination is written):
https://gist.github.com/Therzok/1f03a14ea0641485e4b108253f7fb334

Seems like mono finalizes my object on program termination, rather than thread termination.
@Therzok
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@Therzok Therzok commented Dec 6, 2017

Reproduced in:
Mono JIT compiler version 5.9.0.578 (pull-request-6144/0dd90205c29 Sat Dec 2 10:51:55 EST 2017)
Mono JIT compiler version 5.8.0.89 (2017-10/b3b0613ad38 Tue Nov 28 12:18:29 EST 2017)
luhenry added a commit to luhenry/mono that referenced this issue Dec 8, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
fb679cd 
Fixes mono#6169
@luhenry luhenry mentioned this issue Dec 8, 2017
Merged
luhenry added a commit to luhenry/mono that referenced this issue Dec 8, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
5021bee 
Fixes mono#6169
@Therzok
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@Therzok Therzok commented Dec 9, 2017 •
edited

This works fine on stable (5.4).
luhenry added a commit to luhenry/mono that referenced this issue Dec 11, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
d3f3dd1 
Fixes mono#6169
@luhenry
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@luhenry luhenry commented Dec 11, 2017

The regression has been introduced with a08574b
luhenry added a commit to luhenry/mono that referenced this issue Dec 12, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
1e3fb99 
Fixes mono#6169
luhenry added a commit to luhenry/mono that referenced this issue Dec 15, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
ece9c4f 
Fixes mono#6169
@luhenry luhenry mentioned this issue Dec 15, 2017
Merged
luhenry added a commit to luhenry/mono that referenced this issue Dec 17, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
8635284 
Fixes mono#6169
luhenry added a commit to luhenry/mono that referenced this issue Dec 17, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
9224a18 
Fixes mono#6169
@luhenry luhenry mentioned this issue Dec 17, 2017
Merged
luhenry added a commit that referenced this issue Dec 17, 2017
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread (#6258)
Verified
This commit was created on GitHub.com and signed with a verified signature using GitHub’s key.
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ce89e4c 
Fixes #6169
marek-safar added a commit that referenced this issue Dec 18, 2017
@luhenry @marek-safar
[threads] Fix leak of gchandle to MonoInternalThread
17f4b42 
Fixes #6169
jonpryor added a commit to jonpryor/xamarin-android that referenced this issue Dec 18, 2017
@jonpryor
Bump to mono/2017-10/ce89e4c5
8f0eb4d 
Context: mono/mono#6169
@jonpryor jonpryor mentioned this issue Dec 18, 2017
Merged
jonpryor added a commit to xamarin/xamarin-android that referenced this issue Dec 18, 2017
@jonpryor
Bump to mono/2017-10/ce89e4c5 (#1124)
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This commit was created on GitHub.com and signed with a verified signature using GitHub’s key.
GPG key ID: 4AEE18F83AFDEB23 Learn about signing commits
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ff71803 
Context: mono/mono#6169
luhenry added a commit to luhenry/mono that referenced this issue Apr 3, 2018
@luhenry
[threads] Fix leak of gchandle to MonoInternalThread
d2f5139 
Fixes mono#6169
jonpryor added a commit to xamarin/xamarin-android that referenced this issue Apr 25, 2018
@baulig @jonpryor
Bump to mono/2018-02/0c5a524e (#1289)
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166e7d5 
Bumps to Java.Interop/master/0afb2b0f
Bumps to llvm/master/a9cfb50e.

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