Control: forwarded -1 https://bugreports.qt.io/browse/QTBUG-69555 Hi Ben! El viernes, 20 de julio de 2018 07:53:03 -03 Ben Hutchings escribió: > Control: reassign -1 src:qtbase-opensource-src 5.10.1+dfsg-7 > Control: reassign 898021 src:qtbase-opensource-src 5.10.1+dfsg-7 > Control: unblock -1 with 898021 > Control: forcemerge -1 898021 > > sddm is making a blocking call to getrandom(), via the glibc function > getentropy(), via the QRandomGenerator class. Here's a backtrace: > > #0 0x00007ffff5ef303a in getentropy (buffer=0x7fffffffe9dc, > length=<optimized out>) at ../sysdeps/unix/sysv/linux/getentropy.c:45 > #1 0x00007ffff68a2beb in ?? () > from target:/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 > #2 0x00007ffff68a3538 in QHashData::detach_helper(void > (*)(QHashData::Node*, void*), void (*)(QHashData::Node*), int, int) () from > target:/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 > #3 0x00007ffff69af7c1 in ?? () > from target:/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 > #4 0x00007ffff69aef3b in QLoggingCategory::defaultCategory() () > from target:/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 > #5 0x00007ffff683d815 in qt_message_output(QtMsgType, QMessageLogContext > const&, QString const&) () from > target:/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #6 0x00007ffff693bf70 in > QDebug::~QDebug() () > from target:/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 > #7 0x000055555559c870 in SDDM::DaemonApp::DaemonApp(int&, char**) () > #8 0x000055555557d1c6 in main () > > Reassigning this to Qt as it is not safe to use these functions in a > general-purpose library for Linux. They should only be used if it's > acceptable to wait some time for entropy to be available. Thanks *a lot* for the analysis. I have checked the SDDM and Qt code and indeed it seems a bug in Qt, as QRandomGenerator is used in QHash. However it might be a bug because according to the doc it should detect this cases and fall back to pseudo-random generators. All in all, thanks again for pointing this. -- Los estadounidenses no tienen la culpa, la guerra tiene la culpa. La falta de voluntad de la gente para comprender a aquellos que tienen valores diferentes, eso es lo que tiene la culpa. Shinji Mikamo <http://www.lanacion.com.ar/1716475-el-cataclismo-nuclear-de-hiroshima-narrado-por-un-superviviente> Lisandro Damián Nicanor Pérez Meyer http://perezmeyer.com.ar/ http://perezmeyer.blogspot.com/
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