test_elif_deep sometimes fail with RecursionError

[frenzymadness]

I'm running this test in our pipelines many times (during the build of RPM packages):

jinja/tests/test_core_tags.py

Lines 313 to 318 in 220e67a

	def test_elif_deep(self, env):
	elifs = "\n".join(f"{{% elif a == {i} %}}{i}" for i in range(1, 1000))
	tmpl = env.from_string(f"{{% if a == 0 %}}0{elifs}{{% else %}}x{{% endif %}}")
	for x in (0, 10, 999):
	assert tmpl.render(a=x).strip() == str(x)
	assert tmpl.render(a=1000).strip() == "x"

and it sometimes fail with:

=================================== FAILURES ===================================
________________________ TestIfCondition.test_elif_deep ________________________
self = <test_core_tags.TestIfCondition object at 0x3ff7f196c40>
env = <jinja2.environment.Environment object at 0x3ff7edf8910>
    def test_elif_deep(self, env):
        elifs = "\n".join(f"{{% elif a == {i} %}}{i}" for i in range(1, 1000))
>       tmpl = env.from_string(f"{{% if a == 0 %}}0{elifs}{{% else %}}x{{% endif %}}")
tests/test_core_tags.py:315: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../BUILDROOT/usr/lib/python3.13/site-packages/jinja2/environment.py:1111: in from_string
    return cls.from_code(self, self.compile(source), gs, None)
../BUILDROOT/usr/lib/python3.13/site-packages/jinja2/environment.py:769: in compile
    return self._compile(source, filename)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
self = <jinja2.environment.Environment object at 0x3ff7edf8910>
source = "from jinja2.runtime import LoopContext, Macro, Markup, Namespace, TemplateNotFound, TemplateReference, TemplateRuntim...&987=2973&988=2976&989=2979&990=2982&991=2985&992=2988&993=2991&994=2994&995=2997&996=3000&997=3003&998=3006&999=3009'"
filename = '<template>'
    def _compile(self, source: str, filename: str) -> CodeType:
        """Internal hook that can be overridden to hook a different compile
        method in.
    
        .. versionadded:: 2.5
        """
>       return compile(source, filename, "exec")
E       RecursionError: maximum recursion depth exceeded during compilation
../BUILDROOT/usr/lib/python3.13/site-packages/jinja2/environment.py:709: RecursionError
=========================== short test summary info ============================
FAILED tests/test_core_tags.py::TestIfCondition::test_elif_deep - RecursionEr...
======================== 1 failed, 908 passed in 2.13s =========================

I know it's probably not a problem in Jinja itself, but I don't know how to reproduce it and where to report it, so I thought I'd just let you know. The problem is not caused by the number of elifs because I can higher it to 5000 and the test still works fine.

The packages are built on many different architectures (x86, s390x, ppc64le, aarch64) and they don't influence the result.

Do you have an idea what might cause this?

Environment:

• Python version: 3.12 and 3.13
• Jinja version: 3.1.6

[santosh50]

I am seeing the same error for Python 3.12, jinja 3.1.6 on s390x architecture:

__________________________________________ TestIfCondition.test_elif_deep __________________________________________

self = <test_core_tags.TestIfCondition object at 0x3ff8962c050>
env = <jinja2.environment.Environment object at 0x3ff89308a70>

    def test_elif_deep(self, env):
        elifs = "\n".join(f"{{% elif a == {i} %}}{i}" for i in range(1, 1000))
>       tmpl = env.from_string(f"{{% if a == 0 %}}0{elifs}{{% else %}}x{{% endif %}}")
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/test_core_tags.py:315: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../../py312venv/lib64/python3.12/site-packages/jinja2/environment.py:1111: in from_string
    return cls.from_code(self, self.compile(source), gs, None)
                               ^^^^^^^^^^^^^^^^^^^^
../../py312venv/lib64/python3.12/site-packages/jinja2/environment.py:769: in compile
    return self._compile(source, filename)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <jinja2.environment.Environment object at 0x3ff89308a70>
source = "from jinja2.runtime import LoopContext, Macro, Markup, Namespace, TemplateNotFound, TemplateReference, TemplateRuntim...&987=2973&988=2976&989=2979&990=2982&991=2985&992=2988&993=2991&994=2994&995=2997&996=3000&997=3003&998=3006&999=3009'"
filename = '<template>'

    def _compile(self, source: str, filename: str) -> CodeType:
        """Internal hook that can be overridden to hook a different compile
        method in.
    
        .. versionadded:: 2.5
        """
>       return compile(source, filename, "exec")
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E       RecursionError: maximum recursion depth exceeded during compilation

../../py312venv/lib64/python3.12/site-packages/jinja2/environment.py:709: RecursionError
============================================= short test summary info ==============================================
FAILED tests/test_core_tags.py::TestIfCondition::test_elif_deep - RecursionError: maximum recursion depth exceeded during compilation
========================================== 1 failed, 908 passed in 1.88s ===========================================```