Hi, Thanks for popping by! The answer to the question in the subject line of your email (stack size of processes spawned by sel4utils_configure_process()) is that sel4utils_configure_process() calls sel4utils_configure_thread(), which allocates the stack using vspace_new_pages(), found here: (https://github.com/seL4/seL4_libs/blob/master/libsel4vspace/include/vspace/v...). The stack size is determined by CONFIG_SEL4UTILS_STACK_SIZE, which can be set in your `make menuconfig` settings. Try: `make menuconfig` -> select "seL4 Libraries" -> "libsel4utils" and change the stack size as desired. That said,

However, when I try to increase the size of an array to 80,000 bytes, the second process wont start. I tried to increase ALLOCATOR_VIRTUAL_POOL_SIZE but it still does not work.

Sorry, I'll need to know a bit more about what's going on here: could you post some more detailed output, or maybe a diff, so I can try to aid you? --Yours truly, Kofi