Python not compiled with -fexceptions in ppc64le

Bug #1691848 reported by Bruno Rosa on 2017-05-18
This bug affects 1 person
Affects Status Importance Assigned to Milestone
python2.7 (Ubuntu)
python3.6 (Ubuntu)

Bug Description

Pytorch ( is an application that is written in python, C and C++. There's high interoperalibity between code written in these languages therex.

The issue is that there are cases when an exception is thrown by C++ code that subsequentely calls some C code before being caught.

In ppc64le builds, without the -fexceptions gcc flag, such exceptions are not caught when the execution returns to C++ code from C code. This makes some Pytorch tests fail.

Compiling CPython with -fexceptions seems to solve this issue.

This was also reported to Debian:

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: python2.7 2.7.13-2
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic ppc64le
.var.log.platform: Error: [Errno 13] Permission denied: '/var/log/platform'
ApportVersion: 2.20.4-0ubuntu4
Architecture: ppc64el
Date: Thu May 18 15:35:54 2017
InstallationDate: Installed on 2015-11-05 (560 days ago)
InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release ppc64el (20150422)
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
ProcLoadAvg: 0.07 0.33 0.43 1/348 20166
ProcSwaps: Filename Type Size Used Priority
ProcVersion: Linux version 4.10.0-19-generic (buildd@bos01-ppc64el-009) (gcc version 6.3.0 20170321 (Ubuntu 6.3.0-10ubuntu1) ) #21-Ubuntu SMP Thu Apr 6 17:03:05 UTC 2017
SourcePackage: python2.7
UpgradeStatus: Upgraded to zesty on 2017-04-17 (30 days ago)
cpu_cores: Number of cores present = 2
cpu_coreson: Number of cores online = 2
cpu_smt: SMT=8

Bruno Rosa (bruno.rosa) wrote :
Bruno Rosa (bruno.rosa) on 2017-05-19
description: updated
Matthias Klose (doko) wrote :

is powerpc64le-linux-gnu the only architecture affected?

Bruno Rosa (bruno.rosa) wrote :

The flag is not passed to any archictecture. x64 is not affected. Also tested on a Aarch64 and it seems to be affected, but I don't have access to a Aarch64 machine anymore.

Please see .

Launchpad Janitor (janitor) wrote :

This bug was fixed in the package python3.6 - 3.6.2~rc1-1

python3.6 (3.6.2~rc1-1) unstable; urgency=medium

  * Python 3.6.2 release candidate 1.
  * Update symbols files.
  * Build using -fexceptions on ppc64 and ppc64el.
    Addresses: #862925. LP: #1691848.

 -- Matthias Klose <email address hidden> Tue, 20 Jun 2017 14:51:36 +0200

Changed in python3.6 (Ubuntu):
status: New → Fix Released

An upload of python3.5 to xenial-proposed has been rejected from the upload queue for the following reason: "Bug# 1682934 is missing SRU testcase/impact/regresison potential; all bugs are missing a Zesty upload which is requried before we could release the Xenial update.".

Gustavo Serra Scalet (gut) wrote :

What about Python v2.7?

Launchpad Janitor (janitor) wrote :

This bug was fixed in the package python2.7 - 2.7.14~rc1-3ubuntu1

python2.7 (2.7.14~rc1-3ubuntu1) artful; urgency=medium

  * Regenerate the _PyFPE breaks list for Ubuntu.

 -- Matthias Klose <email address hidden> Tue, 05 Sep 2017 20:19:52 +0200

Changed in python2.7 (Ubuntu):
status: New → Fix Released
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