Hi all, Apologies in advance for not providing a testable case that can be fired up. I'm hoping the background info provided and investigation work shown below is enough to help trace what the issue is.
PROBLEM DEFINITION: I work with a custom java application that loads GIS data using GDAL (current TRUNK code in use though issue occurs with v1.7.2 also). We can load a variety of data types (MapInfo, DGN,etc) with no issues. A problem occurs when TIGER data is loaded though - the TIGER data loads and is viewable but after a few pans and zooms the JAVA server process crashes. This seems to happen when it tries to unload loaded features. Was using US Census data tiger files. PROBLEM ANALYSIS: Two sources of debug information were looked at. A (1) general log file generated by java and (2) a core dump file. The outputs of these are below. 1. LOG NUMBER ONE: The log file generated on crash indicates the source of the problem is the GDAL library when features are deleted. Current thread (0x0000000041a4d800): JavaThread "FeatureNativeObjectsCleaner" daemon [_thread_in_native, id=28311, stack(0x00007ff5f4cc8000,0x00007ff5f4dc9000)] siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x000000000000003a Stack: [0x00007ff5f4cc8000,0x00007ff5f4dc9000], sp=0x00007ff5f4dc77a8, free space=3fd0000000000000018k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) C 0x0000000042355af0 j org.gdal.ogr.FeatureNative.delete()V+23 2. LOG NUMBER TWO: A linux core dump was captured when the JVM crashed. This was analysed for more precise details using the GDB debugger using the approach outlined at http://www.dialogic.com/support/helpweb/dxall/tn957.aspx The output from the core dump file analysis was: Loaded symbols for /usr/lib/jvm/jrrt-4.0.1-1.6.0/jre/lib/amd64/libdcpr.so Core was generated by `/usr/lib/jvm/java-6-jrockit/bin/java -Xms2048m -Xmx2048m -Djava.util.logging.ma'. Program terminated with signal 6, Aborted. #0 0x00007f51ac719a75 in raise () from /lib/libc.so.6 (gdb) bt #0 0x00007f51ac719a75 in raise () from /lib/libc.so.6 #1 0x00007f51ac71d5c0 in abort () from /lib/libc.so.6 #2 0x00007f51ac7534fb in ?? () from /lib/libc.so.6 #3 0x00007f51ac75d5b6 in ?? () from /lib/libc.so.6 #4 0x00007f51ac7616d8 in ?? () from /lib/libc.so.6 #5 0x00007f51ac76258e in malloc () from /lib/libc.so.6 #6 0x00007f515d06c262 in OGRLineString::exportToWkt (this=0x7f5154722bb0, ppszDstText=0x7f5158804728) at ogrlinestring.cpp:1049 #7 0x00007f515d51655f in OGRGeometryShadow_ExportToWkt__SWIG_1 (jenv=0x5952bf0, jcls=<value optimized out>, jarg1=6, jarg1_=0xffffffffffffffff) at ogr_wrap.cpp:1792 #8 Java_org_gdal_ogr_ogrJNI_Geometry_1ExportToWkt_1_1SWIG_11 (jenv=0x5952bf0, jcls=<value optimized out>, jarg1=6, jarg1_=0xffffffffffffffff) at ogr_wrap.cpp:7166 #9 0x00007f5166de2715 in ?? () #10 0x00000000827520c0 in ?? () 1. The core dump file indicates that an exception occurs in the file ogrlinestring.cpp at L1049. In the GDAL trunk source code that I have this corresponds to the line: *ppszDstText = (char *) VSIMalloc( nMaxString ); 2. The output from Log #1 indicates that there might be an issue with memory pointers. This is based on the SEGV_MAPERR error output and the opinion on the post here: http://www.linuxquestions.org/questions/programming-9/free-invalid-next-size-fast-c-error-729852/ It looks like the problem could be a memory pointer size issue related to ogrlinestring. If anyone could take a quick look and suggest a fix that would be appreciated. I'm a java programmer lost in a C++ world on this one. Thanks, Brian
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev