Can you send us the stack trace which you can find in the hs_err_pid*.log? is the system memory all used up (free)? any errors in the logs just before the crash?

Regards,
</VJ>



On Mon, Mar 26, 2012 at 12:35 AM, Maciej Miklas <mac.miklas@googlemail.com> wrote:
I have row cache - it's about 20GB big in this case.
The problem can be reproduced with our load test - we are using 20 reader threads on single Cassandra node.

I will retest it with Java 6 - still it looks to me like JNA problem and JDK in this case should not matter, but we will see.


On Thu, Mar 22, 2012 at 8:27 PM, Benoit Perroud <benoit@noisette.ch> wrote:
Sounds like a race condition in the off heap caching while calling
Unsafe.free().

Do you use cache ? What is your use case when you encounter this error
? Are you able to reproduce it ?


2012/3/22 Maciej Miklas <mac.miklas@googlemail.com>:
> Hi *,
>
> My Cassandra installation runs on flowing system:
>
> Linux with Kernel 2.6.32.22
> jna-3.3.0
> Java 1.7.0-b147
>
> Sometimes we are getting following error:
>
> *** glibc detected *** /var/opt/java1.7/bin/java: free(): invalid pointer:
> 0x00007f66088a6000 ***
> ======= Backtrace: =========
> /lib/libc.so.6[0x7f661d7099a8]
> /lib/libc.so.6(cfree+0x76)[0x7f661d70bab6]
> /lib64/ld-linux-x86-64.so.2(_dl_deallocate_tls+0x59)[0x7f661e02f349]
> /lib/libpthread.so.0[0x7f661de09237]
> /lib/libpthread.so.0[0x7f661de0931a]
> /lib/libpthread.so.0[0x7f661de0a0bd]
> /lib/libc.so.6(clone+0x6d)[0x7f661d76564d]
> ======= Memory map: ========
> 00400000-00401000 r-xp 00000000 68:07 537448203
> /var/opt/jdk1.7.0/bin/java
> 00600000-00601000 rw-p 00000000 68:07 537448203
> /var/opt/jdk1.7.0/bin/java
> 01bae000-01fd0000 rw-p 00000000 00:00 0
> [heap]
> 01fd0000-15798000 rw-p 00000000 00:00 0
> [heap]
> 40002000-40005000 ---p 00000000 00:00 0
> 40005000-40023000 rw-p 00000000 00:00 0
> 40030000-40033000 ---p 00000000 00:00 0
> 40033000-40051000 rw-p 00000000 00:00 0
>
> Does anyone have similar problems? or maybe some hints?
>
> Thanks,
> Maciej



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