Strange mapscriptJNI_delete_1layerObj+0xf error killing Tomcat

[Rodrigo Del C. Andrade]

    Hello dear list.

   A problem is happening in our production machine which we were unable 
to reproduce on our development machines. We have a very large 
application almost ready for deployment, in which one of the modules is 
written in java mapscript 4.10.1,  and the error on the attached log 
happened for the first time when we installed the application on the 
production server. Whats worse, the GIS module causing the error brings 
down Tomcat and the whole application with it.
    This is a excerpt from the JVM log:

# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  SIGSEGV (0xb) at pc=0x636ff93b, pid=19162, tid=1759710128
#
# Java VM: Java HotSpot(TM) Server VM (1.5.0_07-b03 mixed mode)
# Problematic frame:
# C  [libmapscript.so+0x3893b]  
Java_edu_umn_gis_mapscript_mapscriptJNI_delete_1layerObj+0xf
#

---------------  T H R E A D  ---------------

Current thread (0x08112ee0):  JavaThread "Finalizer" daemon 
[_thread_in_native, id=19174]

siginfo:si_signo=11, si_errno=0, si_code=1, si_addr=0x627e7024

Registers:
EAX=0x636ff92c, EBX=0x6b363670, ECX=0x084a03a0, EDX=0x6b372b58
ESP=0x68e2dae4, EBP=0x68e2fafc, ESI=0x627e7000, EDI=0x08112ee0
EIP=0x636ff93b, CR2=0x627e7024, EFLAGS=0x00010216

Top of Stack: (sp=0x68e2dae4)
0x68e2dae4:   00000000 00000000 000004b0 00000000
0x68e2daf4:   00000000 00000000 00000000 00000000
0x68e2db04:   00000000 00000000 00000000 00000000
0x68e2db14:   00000000 00000000 00000000 00000000
0x68e2db24:   00000000 00000000 00000000 00000000
0x68e2db34:   00000000 00000000 00000000 00000000
0x68e2db44:   00000000 00000000 00000000 00000000
0x68e2db54:   00000000 00000000 00000000 00000000

Instructions: (pc=0x636ff93b)
0x636ff92b:   90 55 89 e5 57 56 53 81 ec 0c 20 00 00 8b 75 10
0x636ff93b:   8b 4e 24 e8 00 00 00 00 5b 81 c3 15 63 0e 00 85

Stack: [0x68db0000,0x68e31000),  sp=0x68e2dae4,  free space=502k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, 
C=native code)
C  [libmapscript.so+0x3893b]  
Java_edu_umn_gis_mapscript_mapscriptJNI_delete_1layerObj+0xf
j  edu.umn.gis.mapscript.mapscriptJNI.delete_layerObj(J)V+0
j  edu.umn.gis.mapscript.layerObj.delete()V+25
j  edu.umn.gis.mapscript.layerObj.finalize()V+1
v  ~StubRoutines::call_stub
V  [libjvm.so+0x2649ac]
V  [libjvm.so+0x427bc8]
V  [libjvm.so+0x2647df]
V  [libjvm.so+0x28f233]
V  [libjvm.so+0x2755b4]
C  [libjava.so+0xb3be]  
Java_java_lang_ref_Finalizer_invokeFinalizeMethod+0x6e
j  java.lang.ref.Finalizer.invokeFinalizeMethod(Ljava/lang/Object;)V+0
j  java.lang.ref.Finalizer.runFinalizer()V+45
j  java.lang.ref.Finalizer.access$100(Ljava/lang/ref/Finalizer;)V+1
j  java.lang.ref.Finalizer$FinalizerThread.run()V+11
v  ~StubRoutines::call_stub
V  [libjvm.so+0x2649ac]
V  [libjvm.so+0x427bc8]
V  [libjvm.so+0x264205]
V  [libjvm.so+0x26429e]
V  [libjvm.so+0x2db925]
V  [libjvm.so+0x4c6cb3]
V  [libjvm.so+0x4287d8]
C  [libpthread.so.0+0x5371]

    It seems to happen while rendering the a map, but not always, so it 
cant be consistently reproduced. We just query maps and it will happen 
eventually.
    Also, "delete_1layer" is hints at the removal of a layer (duh) but 
we don't have a remove or delete layers anywhere in our code, so we 
suspect of GC problems. Could it be related to the problems Umberto 
describes in
    
http://lists.umn.edu/cgi-bin/wa?A2=ind0705&L=MAPSERVER-USERS&P=R28693 
and specially
    http://mapserver.gis.umn.edu/development/rfc/ms-rfc-24/   
   and if it is, could there be anything possible to workaround it? Full 
log attached.

    We're at a loss here, folks. Any help is greatly appreciated
    Thanks,

    Rod

-- 

*Rodrigo Del C. Andrade*
/Programador/
/SIC - SSE - Soluções Segurança Pública/

*DÍGITRO TECNOLOGIA*
*E-mail:* rodrigo.andrade at digitro.com.br 
<mailto:rodrigo.andrade at digitro.com.br>
*Fone:* +55 48 3281-7314 / +55 48 3281-7000
*Fax:* +55 48 3281-7299
*Site:* www.digitro.com <http://www.digitro.com>
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