PPC64: JVM crash on Hadoop + Terasort

[Doerr, Martin]

Hi Gustavo,

seems to be the bug which was recently fixed in 9 but not downported to 8:
8170409: CMS: Crash in CardTableModRefBSForCTRS::process_chunk_boundaries

Best regards,
Martin


-----Original Message-----
From: hotspot-dev [mailto:hotspot-dev-bounces at openjdk.java.net] On Behalf Of Gustavo Romero
Sent: Mittwoch, 7. Dezember 2016 23:21
To: hotspot-dev at openjdk.java.net; ppc-aix-port-dev at openjdk.java.net
Subject: Re: PPC64: JVM crash on Hadoop + Terasort

Also - I forgot to mention - the problem seems to disappear if OpenJDK 8 tag
65-b17 is used instead.

On 07-12-2016 20:14, Gustavo Romero wrote:
> Hi,
> 
> We are experiencing some JVM crashes on 8 when trying to load a large 
> Terasort data set (1 TiB) into Hadoop on PPC64.
> 
> Please refer to the following hs_err log:
> http://paste.fedoraproject.org/501254/48114364/raw/
> 
> The crash seems to be due to an indexed doubleword store in
> libjvm.so:
> 
> 0x85aeb4:	2a 49 e8 7e 	stdx    r23,r8,r9
> 
> that by its turn is generated from
> 
> <CardTableModRefBS::process_stride(Space*, MemRegion, int, int, OopsInGenClosure*, CardTableRS*, signed char**, unsigned long, unsigned long)+468>:	stdx    r23,r8,r9
> 
> present in Parallel GC code 
> hotspot/src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp
> 
> 259	  } else {
> 260	    // In this case we can help our neighbour by just asking them
> 261	    // to stop at our first card (even though it may not be dirty).
> 262	    NOISY(tty->print_cr(" LNC: first block is not a non-array object; setting LNC to first card of current chunk");)
> 263	    assert(lowest_non_clean[cur_chunk_index] == NULL, "Write once : value should be stable hereafter");
> 264	    jbyte* first_card_of_cur_chunk = byte_for(chunk_mr.start());
> 265	    lowest_non_clean[cur_chunk_index] = first_card_of_cur_chunk;
> 266	  }
> 
> 0x85aeb4: 2a 49 e8 7e stdx r23,r8,r9 is generated from parCardTableModRefBS.cpp:265 more precisely.
> 
> I'm not able to reproduce that yet on 9 and create a test case but I 
> would like to ask if someone know some issue potentially related to 
> that one and already reported to the JBS. I could not find any recent ones.
> 
> Also, what could be a good code or JVM configuration to exercise 
> intensively that code, i.e. the else branch parCardTableModRefBS.cpp:259-265.
> 
> Thank you very much.
> 
> 
> Regards,
> Gustavo
>