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Bug 1900527 - Qt application crashing due to miscompilation with LTO
Summary: Qt application crashing due to miscompilation with LTO
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: binutils
Version: 33
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: ---
Assignee: Nick Clifton
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: 1873713
TreeView+ depends on / blocked
 
Reported: 2020-11-23 09:47 UTC by Libor Pechacek
Modified: 2020-11-25 14:25 UTC (History)
9 users (show)

Fixed In Version:
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Clone Of:
Environment:
Last Closed:
Type: Bug
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github clearlinux distribution issues 2169 0 None closed wireshark segfault'ing 2020-12-28 15:02:31 UTC
Qt Bug Tracker QTBUG-86173 0 None None None 2020-11-23 15:16:11 UTC
Red Hat Bugzilla 1873713 0 unspecified CLOSED coredump in libQt5Core.so.5 2022-05-16 11:32:56 UTC
Sourceware 26407 0 P2 RESOLVED Global symbol reference breaks without -Bsymbolic-functions 2020-12-28 15:02:29 UTC

Description Libor Pechacek 2020-11-23 09:47:54 UTC 
OpenOrienteering Mapper (a Qt-based application built with CMake) fails to start on Fedora 33. The issue was tracked down by Mapper developers to be an instance of LTO induced miscompilation that was thoroughly discussed by experts in https://bugreports.qt.io/browse/QTBUG-86173 and https://bugzilla.opensuse.org/show_bug.cgi?id=1175278. The OO Mapper workaround for Fedora is to disable LTO for the moment.

Please revisit your LTO implementation and the toolchain so that Qt applications build correctly again.

Further reading:

binutils upstream report - https://sourceware.org/bugzilla/show_bug.cgi?id=26407

openSUSE report (where the issue was initially analyzed) - https://bugzilla.opensuse.org/show_bug.cgi?id=1175278

Qt upstream report (where the issue was more thoroughly discussed) - https://bugreports.qt.io/browse/QTBUG-86173

Clear Linux report  for Wireshark (identical crash as in Mapper) - https://github.com/clearlinux/distribution/issues/2169

Fedora fix of the same Wireshark bug - https://src.fedoraproject.org/rpms/wireshark/c/e14ec14401ade3c619c14b963b774480d1270b4e

temporary openSUSE fix in libqt5core - https://build.opensuse.org/request/show/845064

likely related Fedora bug report for libqt5core - https://bugzilla.redhat.com/show_bug.cgi?id=1873713
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