[Bug 1872847] Re: qemu-alpha linux-user breaks python3.6

[Barnabas Viragh]

Tested the proposed patch from Sergei Trofimovich, and it solves the
problem, while doesn't break the other archs I use (mips64,arm,aarch64
also tested).

Thank you!

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https://bugs.launchpad.net/bugs/1872847

Title:
  qemu-alpha linux-user breaks python3.6

Status in QEMU:
  New
Status in Gentoo Linux:
  New

Bug description:
  Running on Gentoo Linux in a chroot environment:
  # python3 -c 'import selectors; selectors.DefaultSelector()'
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/usr/lib/python3.7/selectors.py", line 349, in __init__
      self._selector = self._selector_cls()
  OSError: [Errno 22] Invalid argument

  However, on real hardware, with the same binaries there is no
  exception.

  This impacts whole python3 based Gentoo ebuild system (package
  management), and renders linux user mode alpha emulation in chroot
  environment building useless, more or less.

  The used systems:
  # qemu-alpha --version
  qemu-alpha version 4.2.0
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
  # uname -a
  Linux blackbird 5.4.28-gentoo-blackbird-06 #2 SMP Sat Apr 4 13:13:10 CEST 
2020 x86_64 AMD Ryzen 5 3600 6-Core Processor AuthenticAMD GNU/Linux
  (chroot)# python3 --version
  Python 3.7.7

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