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

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

[Barnabas Viragh]

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: alpha linux-user python

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

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

[Laurent Vivier]

Hi,

do you know if it works with previous version of qemu?
Do you know if it works with qemu built from git repo?

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

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

[Barnabas Viragh]

I know, that it is broken since I use for alpha emulation, since
2017-2018. However it worked with python2.7 before. But python 2.7
reached end of life support, and HAVE TO use 3.6 or 3.7, so this one
became a pain now. I will try the git version, but have no high hopes...

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

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

[Barnabas Viragh]

Tried git version qemu-alpha as well, and I can confirm it gives the
same error.

For additional information, neither of these has this bug (nor in 4.2.0, neither in git):
- qemu-mips64
- qemu-arm
- qemu-aarch64

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

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

[Barnabas Viragh]

Related Gentoo bug: https://bugs.gentoo.org/717548

** Also affects: gentoo
   Importance: Undecided
       Status: New

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

[Sergei Trofimovich]

Proposed possible fix as https://lists.nongnu.org/archive/html/qemu-
devel/2020-04/msg02545.html

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

[Barnabas Viragh]

** Changed in: gentoo
       Status: New => Fix Committed

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

Status in QEMU:
  New
Status in Gentoo Linux:
  Fix Released

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

[Barnabas Viragh]

** Changed in: gentoo
       Status: Fix Committed => Fix Released

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

Status in QEMU:
  New
Status in Gentoo Linux:
  Fix Released

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

[Laurent Vivier]

386d38656889  ("linux-user/syscall.c: add target-to-host mapping for
epoll_create1()")


** Changed in: qemu
       Status: New => Fix Committed

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

Status in QEMU:
  Fix Committed
Status in Gentoo Linux:
  Fix Released

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

[Laurent Vivier]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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

Status in QEMU:
  Fix Released
Status in Gentoo Linux:
  Fix Released

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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