Java 11 crash with SIGSEGV when using Shenandoah Garbage Collector | Together Java | Page 1

orchid valleyBOT Dec 5, 2023, 2:51 PM

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<@&987246399047479336> please have a look, thanks.

inland raft Dec 5, 2023, 2:59 PM

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Can you try to use latest?

stone notch Dec 5, 2023, 3:01 PM

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wow

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yeah, ^latest

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go to 21

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(and the program I am running only supports java 11).
👀

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fuckin

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why

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lets solve that problem first

stone notch Dec 5, 2023, 3:23 PM

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Updating the major java version is just not possible
I will help you do this for free.

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i'm not joking

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i want to know where the issues are so i can fix them in open source however i can

inland raft Dec 5, 2023, 3:49 PM

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can't you use the default gc ?

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And note that Shenandoah was only production ready since java 15 https://openjdk.org/jeps/379, so I would say that it is normal that such bug can happen before java 15

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you could also maybe try to update the patch version since a backport may have been done

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But

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do you not have a test server where you can test such thing ? so you can check if updating to latest patch of java 8/11 or update to java 15+ solve the issue ?

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what about ZGC ?

meager forge Dec 5, 2023, 3:54 PM

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ZGC is only java 17+, I think?

inland raft Dec 5, 2023, 3:57 PM

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Shenandoah in experimental since 12 https://openjdk.org/jeps/189 and production since 15 https://openjdk.org/jeps/379
ZGC is in experimental since 11 https://openjdk.org/jeps/333 and production since 15 https://openjdk.org/jeps/377

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so if you can use any of those two in pre java 12

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then it must be a backport or something like that

meager forge Dec 5, 2023, 3:59 PM

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https://wiki.openjdk.org/display/shenandoah/Main

inland raft Dec 5, 2023, 3:59 PM

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well yea, backport

meager forge Dec 5, 2023, 4:00 PM

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I don't know about ZGC, but yes you're correct - Shenandoah was backported to 11

inland raft Dec 5, 2023, 4:01 PM

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are they differences between the two servers in term of OS or architecture ?

stone notch Dec 5, 2023, 4:04 PM

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unsafe usage, internal poking at apis, or c extensions?

inland raft Dec 5, 2023, 4:04 PM

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What you can do are

Ignore the issue and update java/change GC
Try to find the cause or try to fix it
-- by reproducing it
-- by updating either patch or major
-- by filing a bug report (but I doubt it would help if you are not using the latest patch, because then they would ask if it works on latest patch, you could try tho)

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you could try to see the load on the gc, you could enable debug info about the gc, you could check that no there is no unsafe/native stuff that could break it

#Java 11 crash with SIGSEGV when using Shenandoah Garbage Collector