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Please tell us the the following things in your note:
   - the version of Omni that you are using
   - the program (and version) that you are using as well as the
     parameters on the command line.
   - a debug stack trace.

For example, the DeviceTester program traps.

$ ../DeviceTester drawbox driver libCanon_BJC_2000.so cout output24.prn cerr output24.err printmode PRINT_MODE_24_CMYK scanlines 2048
Segmentation fault (core dumped)
$ gdb ../DeviceTester
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(gdb) run drawbox driver libCanon_BJC_2000.so cout output24.prn cerr output24.err printmode PRINT_MODE_24_CMYK scanlines 2048
Starting program: /gs5.50/Omni/Omni.C++/Canon/../DeviceTester drawbox driver libCanon_BJC_2000.so cout output24.prn cerr output24.err printmode PRINT_MODE_24_CMYK scanlines 2048

Program received signal SIGSEGV, Segmentation fault.
0x4003a469 in GplCompressChooseMode (pbRow=0x0, pbLastRow=0x0, iRowLength=360,
    iCompressModes=2, pDelta=0x8053408) at GplCompression.cpp:2250
2250	         if (*(pbRow + i) == *(pbRow + i - 1))      // for TIFF testing
(gdb) bt
#0  0x4003a469 in GplCompressChooseMode (pbRow=0x0, pbLastRow=0x0,
    iRowLength=360, iCompressModes=2, pDelta=0x8053408)
    at GplCompression.cpp:2250
#1  0x40037c9b in GplCompression::compressRasterPlane (this=0x80530d8,
    pbBuffer=0x0, iPrinterBytesInArray=360, pbLastLine=0x0,
    pbCompress=0x8053130 "\202ÿ\202ÿ\227ÿ", cbCompressBuffer=720,
    iCompressModeSupported=2, pDelta=0x8053408, iWhichPlane=3)
    at GplCompression.cpp:338
#2  0x40037a2d in GplCompression::compressKRasterPlane (this=0x80530d8,
    pbdKPlaneIn=0x8054a00) at GplCompression.cpp:239
#3  0x4002c503 in DeviceBlitter::compressKRasterPlane (this=0x8052238,
    pbdKPlane=0x8054a00) at DeviceBlitter.cpp:341
#4  0x401f9c28 in Canon_Blitter::canonColorRasterize ()
   from /gs5.50/Omni/Omni.C++/Canon/libCanon_BJC_2000.so
#5  0x401f8736 in Canon_Blitter::rasterize ()
   from /gs5.50/Omni/Omni.C++/Canon/libCanon_BJC_2000.so
#6  0x400341b5 in PrintDevice::rasterize (this=0x8052188,
    pbBits=0x40235008 "", pbmi2=0x8054c50, prectlPageLocation=0xbffff818,
    eType=BITBLT_BITMAP) at PrintDevice.cpp:827
#7  0x804dc8e in drawPage (iMaxScanLines=2048, pDevice=0x8052188,
    fDrawBox=true, fDrawColors=false) at DeviceTester.cpp:1559
#8  0x804ec76 in main (argc=12, argv=0xbffff934) at DeviceTester.cpp:1883
(gdb) quit
The program is running.  Exit anyway? (y or n) y