Handling of USR2 signal in JVM on Linux

[Andrey Turbanov]

Hello.
During investigation of signal handling in JVM (for
https://github.com/openjdk/jdk/pull/9100#discussion_r894992558 )
I found out that sending USR2 crashes my JDK. (Linux fastdebug x64)

kill -USR2 1346792

# assert(thread != __null) failed: Missing current thread in SR_handler
# Internal Error
(/home/turbanoff/Projects/official_jdk/src/hotspot/os/posix/signals_posix.cpp:1600),
pid=1346792, tid=1346792

Full hs_err_pid1346792.log:
https://gist.github.com/turbanoff/2099327ea13357a90df43a2d6b0e2e6a


Is it known/expected behaviour?
I found some description there
https://docs.oracle.com/en/java/javase/11/troubleshoot/handle-signals-and-exceptions.html
that USR2 is used for SUSPEND/RESUME. Is it supported by Hotspot?


Andrey Turbanov