Hi all,

I'm hunting a strange bug. The Lazarus IDE works with gtk1 under fpc 2.0.2 on x86_64 without problems.
But with fpc 2.1.1 it crashes when opening any modal form. For example open file.

Compiling with -gv and starting with valgrind runs without access violation.

With heaptrc: bug appears at the same position.
With cmem: bug appears with a backtrace without any lineinfo. With cthreads: bug appears with a backtrace without any lineinfo. With -gv, but not in valgrind: bug appears with a backtrace without any lineinfo.

I was not yet able to reproduce the error in a small test application.

Maybe someone of the fpc devels has an idea, where I can start searching? What x86_64 bugs could be related to this problem?

Mattias