64 bit application crashes due to unknown memory corruption in linux

[aruledion]

The application that I ported from 32 bit linux to 64 bit linux is crashing due to unknown memory corruption
Also some time teh address is printed in 32 bit only
as below
this=0x6787e0
any reason why this is happening?

[weaknessforcats]

Your application is 32 bit. It won't be 64 bit until you recompile using a 64-bit compiler.

64 bit operating systems run 32 bit code by using a 32 bit environment layer. This layer is what is executing. It provides a 32 bit environment for your program.

That said, you still have memory corruption. If this is a small program you can use your debugger to find this. If it a large commercial-type thing you may need to install a leak detector.