SIGSEGV after running virtual-thread jetty for a few minutes

[Michael Bien]

awesome!

thanks,
michael

On Wednesday, August 12, 2020, Ron Pressler <ron.pressler at oracle.com> wrote:
> Hi.
> Thank you for reporting this. We are currently in the process of finding
and fixing
> a whole stream of stability bugs. This might take a while, but when we
think things
> are looking good, we’ll notify the list and ask all those who’ve
encountered such
> crashes to try again.
> — Ron
>
> On 12 August 2020 at 05:32:33, Michael Bien (mbien42 at gmail.com) wrote:
>
> Hello Loomers,
>
> after some fun experiments with loom i decided to swap jetty's thread
> pool against the default virtual thread executor* to test some (old)
> apps on it.
>
> Most of it ran great, got some JVM crashes with the apache roller
> blogserver though:
>
> #
> # A fatal error has been detected by the Java Runtime Environment:
> #
> #  SIGSEGV (0xb) at pc=0x00007fc7deedb454, pid=58060, tid=58180
> #
> # JRE version: OpenJDK Runtime Environment (16.0) (build
> 16-internal+0-adhoc.mbien.loom)
> # Java VM: OpenJDK 64-Bit Server VM (16-internal+0-adhoc.mbien.loom,
> mixed mode, sharing, tiered, compressed oops, parallel gc, linux-amd64)
> # Problematic frame:
> # V  [libjvm.so+0x719454]  frame::sender(RegisterMap*) const+0xb4
>
> (that would be today's version of loom from git, i got the same result
> with the official Build 16-loom+4-56)
>
> unfortunately this isn't super easy to reproduce. I ran a short load
> test for a minute, then i waited 1-5 minutes and ran it again - thats
> when it usually crashed. It might have something to do with old carrier
> threads despawning which blocked on native calls. When it ramps up again
> it crashes - but that is only a wild guess i got while looking at the
> visualvm thread graph for too long.
>
> if its a known issue... please ignore. Otherwise let me know how i can
> help. JVM error log attached.
>
> *
https://urldefense.com/v3/__https://github.com/mbien/vt4jetty/blob/master/src/main/java/dev/mbien/virtualthreads4jetty/VirtualThreadExecutor.java__;!!GqivPVa7Brio!LUl7y2T2fvzBkGRze_482solKjdwuJtJemb-yWrlmfhoY3rQzlKxQP9ddnPFIuK8rw$
>
> best regards,
>
> michael bien
>
>
>
>