To emerge "media-libs/mesa-20.2.4::core-gl-kit" is hanging when fetch preceding its installation

[abdu]

>>> Emerging (1 of 4) media-libs/mesa-20.2.4::core-gl-kit
 * Fetching files in the background.
 * To view fetch progress, run in another terminal:
 * tail -f /var/log/emerge-fetch.log

^CTraceback (most recent call last):
  File "/usr/lib/portage/python2.7/lock-helper.py", line 29, in <module>


Exiting on signal 2
    rval = main(sys.argv[1:])
  File "/usr/lib/portage/python2.7/lock-helper.py", line 21, in main
    lock_obj = portage.locks.lockfile(args[0], wantnewlockfile=True)
  File "/usr/lib64/python2.7/site-packages/portage/locks.py", line 113, in lockfile
    unlinkfile=unlinkfile, waiting_msg=waiting_msg, flags=flags)
  File "/usr/lib64/python2.7/site-packages/portage/locks.py", line 249, in _lockfile_iteration
    locking_method(myfd, fcntl.LOCK_EX)
  File "/usr/lib64/python2.7/site-packages/portage/__init__.py", line 325, in __call__
    rval = self._func(*args, **kwargs)
KeyboardInterrupt

Tried to emerge "media-libs/mesa-20.2.4::core-gl-kit"

but as we can see above, is hanging when fetch preceding its installation, so I forced break by control-C.

How to fix and solve it? Please help me out.

Edited February 20, 2021 by abdu