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diff -up yum-3.4.3/cli.py.orig yum-3.4.3/cli.py
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--- yum-3.4.3/cli.py.orig 2017-06-29 17:44:53.784522557 +0200
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+++ yum-3.4.3/cli.py 2017-06-29 17:46:16.249149700 +0200
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@@ -28,6 +28,7 @@ import logging
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import math
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from optparse import OptionParser,OptionGroup,SUPPRESS_HELP
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import rpm
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+import ctypes
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from weakref import proxy as weakref
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@@ -779,6 +780,38 @@ class YumBaseCli(yum.YumBase, output.Yum
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if self.conf.debuglevel < 2:
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cb.display.output = False
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+ # Whenever we upgrade a shared library (and its dependencies) which the
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+ # yum process itself may dlopen() post-transaction (e.g. in a plugin
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+ # hook), we may end up in a situation where the upgraded library and
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+ # the pre-transaction version of a library it depends on which is ABI
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+ # incompatible are loaded in memory at the same time, leading to
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+ # unpredictable behavior and possibly a crash. Let's avoid that by
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+ # preloading all such dynamically loaded libraries pre-transaction so
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+ # that dlopen(), if called post-transaction, uses those instead of
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+ # loading the newly installed versions.
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+ preload = {
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+ # Loaded by libcurl, see BZ#1458841
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+ 'nss-sysinit': ['libnsssysinit.so'],
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+ }
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+ for pkg in preload:
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+ # Only preload the libs if the package is actually installed and we
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+ # are changing it with the transaction
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+ if not self.tsInfo.matchNaevr(name=pkg) or \
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+ not self.rpmdb.searchNevra(name=pkg):
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+ continue
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+ for lib in preload[pkg]:
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+ try:
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+ ctypes.cdll.LoadLibrary(lib)
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+ self.verbose_logger.log(
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+ yum.logginglevels.DEBUG_4,
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+ _('Preloaded shared library %s') % lib
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+ )
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+ except Exception as e:
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+ self.verbose_logger.log(
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+ yum.logginglevels.DEBUG_4,
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+ _('Could not preload shared library %s: %s') % (lib, e)
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+ )
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+
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self.verbose_logger.log(yum.logginglevels.INFO_2, _('Running transaction'))
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resultobject = self.runTransaction(cb=cb)
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