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Here is an excerpt of gdb:

.
*** glibc detected *** simutrans-trunk/simutrans/sim: double free or corruption (top): 0x0000000001774790 ***
======= Backtrace: =========
...


#0  0x00007ffff6a4cab5 in raise () from /lib64/libc.so.6
#1  0x00007ffff6a4dfb6 in abort () from /lib64/libc.so.6
#2  0x00007ffff6a87dd3 in __libc_message () from /lib64/libc.so.6
#3  0x00007ffff6a8d3b6 in malloc_printerr () from /lib64/libc.so.6
#4  0x00007ffff6a922dc in free () from /lib64/libc.so.6
#5  0x00007ffff6a7d705 in fclose@@GLIBC_2.2.5 () from /lib64/libc.so.6
#6  0x00007ffff772b449 in ?? () from /usr/lib64/libSDL-1.2.so.0
#7  0x000000000061df4f in Mix_LoadWAV_RW (src=0x145f960, freesrc=1) at mixer.c:618


The problem here is:
-- SDL_LoadWAV_RW fails, but is called with freesrc==1, hence it closes the given file
-- mixer.c itself wants to close the file again in line 618:

	if ( !loaded ) {
		SDL_free(chunk);
		if ( freesrc ) {
			SDL_RWclose(src); /// causes double free
		}
		return(NULL);
	}

Suggestion: remove the entire if (freesrc) { .. } block, as the called subroutines close the file if freesrc != 0.