Looks like it's caused by PGO builds, since the `profileserver.py` script is invoked without specifying the build virtualenv.
Bug 1732177 Comment 7 Edit History
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Looks like it's caused by PGO builds, since the `profileserver.py` script is invoked without specifying the build virtualenv. Thanks for the build log, the part that made this possible to diagnose is: ``` File "/var/tmp/portage/www-client/firefox-9999/work/firefox-9999/python/mozbuild/mozbuild/build_commands.py", line 219, in build subprocess.check_call(pgo_cmd, cwd=instr.topobjdir, env=pgo_env) File "/usr/lib/python3.10/subprocess.py", line 364, in check_call retcode = call(*popenargs, **kwargs) File "/usr/lib/python3.10/subprocess.py", line 345, in call with Popen(*popenargs, **kwargs) as p: File "/usr/lib/python3.10/subprocess.py", line 965, in __init__ self._execute_child(args, executable, preexec_fn, close_fds, File "/usr/lib/python3.10/subprocess.py", line 1841, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) ```