Hi, I got a crash with kontact/kmail with the latest updates applied:

It seems that the latest code triggers an assert in the malloc (I left this same information in the icu at bodhi).

My workaround for the moment was to downgrade libicu to the previous version, that works.

For reference I get this:

$ gdb /usr/bin/kontact GNU gdb (GDB) Fedora 8.2.91.20190424-24.fc30 Copyright (C) 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: http://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/.

For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/bin/kontact... (No debugging symbols found in /usr/bin/kontact) Missing separate debuginfos, use: dnf debuginfo-install kontact-18.12.2-1.fc30.x86_64 (gdb) run Starting program: /usr/bin/kontact [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". [New Thread 0x7fffdc50d700 (LWP 5259)] [New Thread 0x7fffda873700 (LWP 5260)] [New Thread 0x7fffd8c34700 (LWP 5261)] kontact: malloc.c:2389: sysmalloc: Assertion `(old_top == initial_top (av) && old_size == 0) || ((unsigned long) (old_size) >= MINSIZE && prev_inuse (old_top) && ((unsigned long) old_end & (pagesize - 1)) == 0)' failed.

Thread 1 "kontact" received signal SIGABRT, Aborted. 0x00007ffff6750eb5 in raise () from /lib64/libc.so.6 (gdb) bt #0 0x00007ffff6750eb5 in raise () from /lib64/libc.so.6 #1 0x00007ffff673b895 in abort () from /lib64/libc.so.6 #2 0x00007ffff679a5f9 in __malloc_assert () from /lib64/libc.so.6 #3 0x00007ffff679c7af in sysmalloc () from /lib64/libc.so.6 #4 0x00007ffff679db75 in _int_malloc () from /lib64/libc.so.6 #5 0x00007ffff679ed3f in malloc () from /lib64/libc.so.6 #6 0x00007ffff5014e44 in icu_63::UnicodeSet::ensureBufferCapacity(int) () from /lib64/libicuuc.so.63 #7 0x00007ffff50156cc in icu_63::UnicodeSet::add(int const*, int, signed char) () from /lib64/libicuuc.so.63 #8 0x00007ffff50159eb in icu_63::UnicodeSet::addAll(icu_63::UnicodeSet const&) () from /lib64/libicuuc.so.63 #9 0x00007ffff501137f in icu_63::UnicodeSet::applyPattern(icu_63::RuleCharacterIterator&, icu_63::SymbolTable const*, icu_63::UnicodeString&, unsigned int, icu_63::UnicodeSet& (icu_63::UnicodeSet::*)(int), int, UErrorCode&) () from / lib64/libicuuc.so.63 #10 0x00007ffff5011a2d in icu_63::UnicodeSet::applyPatternIgnoreSpace(icu_63::UnicodeString const&, icu_63::ParsePosition&, icu_63::SymbolTable const*, UErrorCode&) () from /lib64/libicuuc.so.63 #11 0x00007ffff5011af8 in icu_63::UnicodeSet::applyPattern(icu_63::UnicodeString const&, UErrorCode&) () from /lib64/libicuuc.so.63 #12 0x00007ffff5011bfb in icu_63::UnicodeSet::UnicodeSet(icu_63::UnicodeString const&, UErrorCode&) () from /lib64/libicuuc.so.63 #13 0x00007fffef5bf928 in ?? () from /lib64/libQt5WebEngineCore.so.5 #14 0x00007fffef5bfa3e in ?? () from /lib64/libQt5WebEngineCore.so.5 #15 0x00007fffef5bfa8f in ?? () from /lib64/libQt5WebEngineCore.so.5 #16 0x00007fffef6ee76b in ?? () from /lib64/libQt5WebEngineCore.so.5 #17 0x00007fffef6ee94e in ?? () from /lib64/libQt5WebEngineCore.so.5 #18 0x00007fffef6ef20c in ?? () from /lib64/libQt5WebEngineCore.so.5 #19 0x00007fffef6ef2b2 in ?? () from /lib64/libQt5WebEngineCore.so.5 #20 0x00007fffed38ab3b in ?? () from /lib64/libQt5WebEngineCore.so.5 #21 0x00007fffef6f16d3 in ?? () from /lib64/libQt5WebEngineCore.so.5 #22 0x00007fffed3387bd in ?? () from /lib64/libQt5WebEngineCore.so.5 #23 0x00007fffeef10692 in ?? () from /lib64/libQt5WebEngineCore.so.5 #24 0x00007fffed3a4143 in ?? () from /lib64/libQt5WebEngineCore.so.5 #25 0x00007fffed3a53f4 in ?? () from /lib64/libQt5WebEngineCore.so.5 #26 0x00007ffff6088d77 in ?? () from /lib64/libQt5WebEngineWidgets.so.5 #27 0x00007ffff60899e3 in QWebEnginePage::QWebEnginePage(QObject*) () from / lib64/libQt5WebEngineWidgets.so.5 #28 0x00007ffff7f4d36f in ?? () from /lib64/libkontactprivate.so.5 #29 0x00007ffff7f4d72c in ?? () from /lib64/libkontactprivate.so.5 #30 0x00007ffff7f4e533 in Kontact::MainWindow::initAboutScreen() () from / lib64/libkontactprivate.so.5 #31 0x00007ffff7f551cf in Kontact::MainWindow::initWidgets() () from /lib64/ libkontactprivate.so.5 #32 0x00007ffff7f553ab in Kontact::MainWindow::initGUI() () from /lib64/ libkontactprivate.so.5 #33 0x00007ffff7f57085 in Kontact::MainWindow::MainWindow() () from /lib64/ libkontactprivate.so.5 #34 0x000055555555adc2 in ?? () #35 0x00007ffff7f26d55 in KontactInterface::PimUniqueApplication::start(QStringList const&, bool) () from /lib64/libKF5KontactInterface.so.5 #36 0x0000555555559be8 in ?? () #37 0x00007ffff673cf33 in __libc_start_main () from /lib64/libc.so.6 #38 0x000055555555a4ee in _start ()