[Desktop-packages] [Bug 1621002] Re: Mediascanner2 test failure on yakkety/{armhf, arm64, ppc64el} with latest dbus-cpp

[Launchpad Bug Tracker]

This bug was fixed in the package mediascanner2 -
0.112+16.10.20160909-0ubuntu1

---
mediascanner2 (0.112+16.10.20160909-0ubuntu1) yakkety; urgency=medium

  [ James Henstridge ]
  * When multiple volumes are mounted in quick succession, scan them
serially to avoid reentrancy problems in the initial scan. (LP:
#1489656)
  * Add apparmor-easyprof hardware directories to package so AppArmor
profile can compile when apparmor-easyprof-ubuntu isn't installed.
(LP: #1443693)
  * Disable optimisation when compiling dbus-codec.cc to avoid gcc 6
compilation bug. (LP: #1621002)
  * Replace deprecated use of GetConnectionAppArmorSecurityContext
method with GetConnectionCredentials. (LP: #1489489)

  [ You-Sheng Yang ]
  * Update mediascanner-extractor apparmor profile to cover Android
library locations on 64-bit systems.

 -- James Henstridge   Fri, 09 Sep 2016
13:46:43 +

** Changed in: mediascanner2 (Ubuntu)
   Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1621002

Title:
  Mediascanner2 test failure on yakkety/{armhf,arm64,ppc64el} with
  latest dbus-cpp

Status in dbus-cpp package in Ubuntu:
  New
Status in mediascanner2 package in Ubuntu:
  Fix Released

Bug description:
  When trying to build a new mediascanner2 release, tests failed on a
  number of architectures when building under Yakkety.  Some relevant
  logs:

  
https://launchpadlibrarian.net/281862518/buildlog_ubuntu-yakkety-armhf.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/282074929/buildlog_ubuntu-yakkety-arm64.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/281862178/buildlog_ubuntu-yakkety-ppc64el.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz

  The failure is occurring in code not touched by the changes in the
  silo, and I suspect that this is related to dbus-cpp or possibly GCC
  6.

  The segfault doesn't occur on x86, but I was able to reproduce it on
  my Chromebook.  Attached is a stacktrace from the test_dbus test
  program.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dbus-cpp/+bug/1621002/+subscriptions

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[Desktop-packages] [Bug 1621002] Re: Mediascanner2 test failure on yakkety/{armhf, arm64, ppc64el} with latest dbus-cpp

[Michi Henning]

+1!

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https://bugs.launchpad.net/bugs/1621002

Title:
  Mediascanner2 test failure on yakkety/{armhf,arm64,ppc64el} with
  latest dbus-cpp

Status in dbus-cpp package in Ubuntu:
  New
Status in mediascanner2 package in Ubuntu:
  New

Bug description:
  When trying to build a new mediascanner2 release, tests failed on a
  number of architectures when building under Yakkety.  Some relevant
  logs:

  
https://launchpadlibrarian.net/281862518/buildlog_ubuntu-yakkety-armhf.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/282074929/buildlog_ubuntu-yakkety-arm64.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/281862178/buildlog_ubuntu-yakkety-ppc64el.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz

  The failure is occurring in code not touched by the changes in the
  silo, and I suspect that this is related to dbus-cpp or possibly GCC
  6.

  The segfault doesn't occur on x86, but I was able to reproduce it on
  my Chromebook.  Attached is a stacktrace from the test_dbus test
  program.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dbus-cpp/+bug/1621002/+subscriptions

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[Desktop-packages] [Bug 1621002] Re: Mediascanner2 test failure on yakkety/{armhf, arm64, ppc64el} with latest dbus-cpp

[Launchpad Bug Tracker]

** Branch linked: lp:~jamesh/mediascanner2/bug-1621002

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to dbus-cpp in Ubuntu.
https://bugs.launchpad.net/bugs/1621002

Title:
  Mediascanner2 test failure on yakkety/{armhf,arm64,ppc64el} with
  latest dbus-cpp

Status in dbus-cpp package in Ubuntu:
  New
Status in mediascanner2 package in Ubuntu:
  New

Bug description:
  When trying to build a new mediascanner2 release, tests failed on a
  number of architectures when building under Yakkety.  Some relevant
  logs:

  
https://launchpadlibrarian.net/281862518/buildlog_ubuntu-yakkety-armhf.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/282074929/buildlog_ubuntu-yakkety-arm64.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/281862178/buildlog_ubuntu-yakkety-ppc64el.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz

  The failure is occurring in code not touched by the changes in the
  silo, and I suspect that this is related to dbus-cpp or possibly GCC
  6.

  The segfault doesn't occur on x86, but I was able to reproduce it on
  my Chromebook.  Attached is a stacktrace from the test_dbus test
  program.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dbus-cpp/+bug/1621002/+subscriptions

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[Desktop-packages] [Bug 1621002] Re: Mediascanner2 test failure on yakkety/{armhf, arm64, ppc64el} with latest dbus-cpp

[Michi Henning]

Good catch!

I've seen this in the past due to uninitialised variables. With
optimisation, the compiler gets more aggressive about register re-use,
so a bug can manifest under optimisation when the uninitialised variable
ends up in a register that had a previous value in it. (In debug mode,
the variable often picks up a zero value instead.)

Not sure if there is an easy way to track down whether this is the case
or if this is a genuine code generation problem.

-- 
You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1621002

Title:
  Mediascanner2 test failure on yakkety/{armhf,arm64,ppc64el} with
  latest dbus-cpp

Status in dbus-cpp package in Ubuntu:
  New
Status in mediascanner2 package in Ubuntu:
  New

Bug description:
  When trying to build a new mediascanner2 release, tests failed on a
  number of architectures when building under Yakkety.  Some relevant
  logs:

  
https://launchpadlibrarian.net/281862518/buildlog_ubuntu-yakkety-armhf.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/282074929/buildlog_ubuntu-yakkety-arm64.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/281862178/buildlog_ubuntu-yakkety-ppc64el.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz

  The failure is occurring in code not touched by the changes in the
  silo, and I suspect that this is related to dbus-cpp or possibly GCC
  6.

  The segfault doesn't occur on x86, but I was able to reproduce it on
  my Chromebook.  Attached is a stacktrace from the test_dbus test
  program.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dbus-cpp/+bug/1621002/+subscriptions

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[Desktop-packages] [Bug 1621002] Re: Mediascanner2 test failure on yakkety/{armhf, arm64, ppc64el} with latest dbus-cpp

[James Henstridge]

This is looking like a case of the code being miscompiled under
optimisation.  To reproduce, build mediascanner2 using the
"RelWithDebInfo" build type and then run:

./test/test_dbus --gtest_filter=*filter_codec

The test program segfaults when calling Variant::as() on a
variant that should have been initialised by reading out of a
Message::Reader.

When compiling with the "Debug" build type, the test program completes
without error.

I can probably solve the immediate problem in mediascanner2 by disabling
optimisation for the affected file.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to dbus-cpp in Ubuntu.
https://bugs.launchpad.net/bugs/1621002

Title:
  Mediascanner2 test failure on yakkety/{armhf,arm64,ppc64el} with
  latest dbus-cpp

Status in dbus-cpp package in Ubuntu:
  New
Status in mediascanner2 package in Ubuntu:
  New

Bug description:
  When trying to build a new mediascanner2 release, tests failed on a
  number of architectures when building under Yakkety.  Some relevant
  logs:

  
https://launchpadlibrarian.net/281862518/buildlog_ubuntu-yakkety-armhf.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/282074929/buildlog_ubuntu-yakkety-arm64.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz
  
https://launchpadlibrarian.net/281862178/buildlog_ubuntu-yakkety-ppc64el.mediascanner2_0.112+16.10.20160831-0ubuntu1_BUILDING.txt.gz

  The failure is occurring in code not touched by the changes in the
  silo, and I suspect that this is related to dbus-cpp or possibly GCC
  6.

  The segfault doesn't occur on x86, but I was able to reproduce it on
  my Chromebook.  Attached is a stacktrace from the test_dbus test
  program.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dbus-cpp/+bug/1621002/+subscriptions

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