Since kernel-5.14.0-517.el9 drgn fails to provide a stack trace for kernel threads. In particular it fails with

>>> print(stack_trace(1))
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/usr/lib64/python3.9/site-packages/drgn/__init__.py", line 312, in stack_trace
    return get_default_prog().stack_trace(thread)
Exception: unknown ORC entry type 5

This is because the rhel9 kernel is missing upstream commit b9f174c811e3 ("x86/unwind/orc: Add ELF section with ORC version identifier"). This commit depends on upstream commit 321648455061 ("kbuild: use obj-y instead extra-y for objects placed at the head"), which is quite invasive and shouldn't be backported this late in the RHEL9 cycle (see RHEL-27234 for details). So add a workaround in drgn instead.