Did you look into the fiber_new_ex() interface?
I bet it’s doable to create a fiber with big enough stack.

Again, not about follow-ups: LGTM.
Sergos


> On 26 Mar 2021, at 10:43, Sergey Kaplun <skaplun@tarantool.org> wrote:
> 
> The first Tarantool's fiber has only 512Kb of stack.
> It is not enough for depth recursive call in the test for
> `string.gsub()`.
> 
> This patch disables test leads to Tarantool crash.
> 
> Relates to tarantool/tarantool#5782
> Resolves tarantool/tarantool#5845
> Part of tarantool/tarantool#4473
> ---
> test/PUC-Lua-5.1-tests/pm.lua | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/test/PUC-Lua-5.1-tests/pm.lua b/test/PUC-Lua-5.1-tests/pm.lua
> index b159b6b..c6e42df 100644
> --- a/test/PUC-Lua-5.1-tests/pm.lua
> +++ b/test/PUC-Lua-5.1-tests/pm.lua
> @@ -207,7 +207,11 @@ function rev (s)
> end
> 
> local x = string.rep('012345', 10)
> -assert(rev(rev(x)) == x)
> +-- The first Tarantool's fiber has only 512Kb of stack.
> +-- It is not enough for this recursive call.
> +-- See also https://github.com/tarantool/tarantool/issues/5782.
> +-- FIXME: The test is disabled for Tarantool binary.
> +-- assert(rev(rev(x)) == x)
> 
> 
> -- gsub with tables
> -- 
> 2.31.0
>