patch -d падает, если каталог не существует.

$ gdb --args patch -d NOWHERE
(gdb) r
Starting program: /usr/bin/patch -d NOWHERE
/usr/bin/patch: **** Can't change to directory NOWHERE : No such file or directory

Program received signal SIGSEGV, Segmentation fault.
forget_output_files () at patch.c:1935
1935	  gl_list_iterator_t iter = gl_list_iterator (files_to_output);