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

[Roman Kennke]

It's also triggered by -XX:ParallelGCThreads=1 -XX:ConcGCThreads=1.
Apparently the taskqueue stuff doesn't deal well wih a degenerated
single threaded task pool. I'm looking into it.

Roman

Am Dienstag, den 27.09.2016, 11:32 +0200 schrieb 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
> > 
> 
>