fastdebug, taskset -c 0, -XX:ShenandoahGCHeuristics=aggressive, Terminator assert

[Aleksey Shipilev]

FYI: The same assert triggers when running with rr.

-Aleksey

On 09/26/2016 10:02 PM, Aleksey Shipilev wrote:
> Run like this (note that no class/jar is supplied, bootstrap crashes):
> 
> $ taskset -c 0
> ~/trunks/shenandoah-jdk9/build/linux-x86_64-normal-server-fastdebug/images/jdk//bin/java
> -Xlog  -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
> 
> Crashes like below, probably because reference processing restarts the
> task with the same terminator. Should probably do what G1 is doing with
> sequential ref processing.
> 
> [0.161s][info][gc,phases,start  ] Pause Init-Evacuation (0.161s)
> [0.161s][info][gc,task          ] GC Workers: using 1 out of 1
> [0.161s][info][gc,task          ] GC Workers: using 1 out of 1
> [0.161s][info][gc,task          ] GC Workers: using 1 out of 1
> [0.161s][info][gc,task          ] ENTER:
> ShenandoahConcurrentMark::final_mark_loop thread 0x00007f6184048800
> terminator 0x00007f61891dc780
> [0.161s][info][gc,task          ] ENTER: offer_termination() thread
> 0x00007f6184048800, offered=0
> [0.161s][info][gc,task          ] EXIT TRUE: offer_termination() thread
> 0x00007f6184048800, offered=1
> [0.161s][info][gc,task          ] EXITING:
> ShenandoahConcurrentMark::final_mark_loop thread 0x00007f6184048800
> terminator 0x00007f61891dc780
> [0.161s][info][gc,task          ] GC Workers: using 1 out of 1
> [0.161s][info][gc,task          ] ENTER:
> ShenandoahConcurrentMark::final_mark_loop thread 0x00007f61841aa000
> terminator 0x00007f61891dc6e0
> [0.161s][info][gc,task          ] ENTER: offer_termination() thread
> 0x00007f61841aa000, offered=0
> [0.161s][info][gc,task          ] EXIT TRUE: offer_termination() thread
> 0x00007f61841aa000, offered=1
> [0.161s][info][gc,task          ] EXITING:
> ShenandoahConcurrentMark::final_mark_loop thread 0x00007f61841aa000
> terminator 0x00007f61891dc6e0
> [0.161s][info][gc,task          ] ENTER:
> ShenandoahConcurrentMark::final_mark_loop thread 0x00007f61841aa000
> terminator 0x00007f61891dc6e0
> [0.161s][info][gc,task          ] ENTER: offer_termination() thread
> 0x00007f61841aa000, offered=1
> # To suppress the following error report, specify this argument
> # after -XX: or in .hotspotrc:  SuppressErrorAt=/taskqueue.cpp:157
> #
> # A fatal error has been detected by the Java Runtime Environment:
> #
> #  Internal Error
> (/home/shade/trunks/shenandoah-jdk9/hotspot/src/share/vm/gc/shared/taskqueue.cpp:157),
> pid=28073, tid=28078
> #  assert(_offered_termination < _n_threads) failed: Invariant
> #
> # JRE version: OpenJDK Runtime Environment (9.0) (fastdebug build
> 9-internal+0-2016-09-21-132926.shade.shenandoah-jdk9)
> # Java VM: OpenJDK 64-Bit Server VM (fastdebug
> 9-internal+0-2016-09-21-132926.shade.shenandoah-jdk9, mixed mode,
> tiered, compressed oops, Shenandoah gc, linux-amd64)
> # Core dump will be written. Default location: Core dumps may be
> processed with "/usr/share/apport/apport %p %s %c %P" (or dumping to
> /home/shade/projects/jol/core.28073)
> #
> # An error report file with more information is saved as:
> # /home/shade/projects/jol/hs_err_pid28073.log
> #
> # If you would like to submit a bug report, please visit:
> #   http://bugreport.java.com/bugreport/crash.jsp
> #
> 
> Thanks,
> -Aleksey
>