Hi, Julien Cristau very nicely explained that libgl1-mesa-dri-dbgsym is available in the debug archive.
So, I'm happy to report the following gdb trace with symbolic offsets in nouveau: Program received signal SIGSEGV, Segmentation fault. 0xa2c17e2e in list_del (item=0x48920048) at ../../../../../src/util/list.h:84 84 ../../../../../src/util/list.h: No such file or directory. (gdb) bt full #0 0xa2c17e2e in list_del (item=0x48920048) at ../../../../../src/util/list.h:84 No locals. #1 nouveau_fence_trigger_work (fence=fence@entry=0x4a7e0d20) at ../../../../../src/gallium/drivers/nouveau/nouveau_fence.c:57 work = 0x48920048 tmp = 0x484800d8 #2 0xa2c18079 in nouveau_fence_update (screen=0x80b547d0, flushed=false) at ../../../../../src/gallium/drivers/nouveau/nouveau_fence.c:132 fence = 0x4a7e0d20 next = 0x0 sequence = 2550 #3 0xa2c1838b in nouveau_fence_wait (fence=0xb090e160, debug=0x0) at ../../../../../src/gallium/drivers/nouveau/nouveau_fence.c:223 screen = 0x80b547d0 spins = 1432577896 start = 0 #4 0xa2c18f98 in nouveau_screen_fence_finish (screen=0x80b547d0, pfence=0xb090e160, timeout=18446744073709551615) at ../../../../../src/gallium/drivers/nouveau/nouveau_screen.c:79 screen = 0x80b547d0 timeout = 18446744073709551615 pfence = 0xb090e160 #5 0xa2adaa8b in dri_flush (cPriv=0x82059580, dPriv=0x81fa53c8, flags=3, reason=__DRI2_THROTTLE_SWAPBUFFER) at ../../../../../src/gallium/state_trackers/dri/dri_drawable.c:528 screen = 0x80b547d0 fence = 0xb090e160 flush_flags = <optimized out> swap_msaa_buffers = 0 '\000' #6 0xb7c8cd95 in ?? () from /usr/lib/i386-linux-gnu/libGL.so.1 No symbol table info available. #7 0xb7c8d18e in ?? () from /usr/lib/i386-linux-gnu/libGL.so.1 No symbol table info available. #8 0xb7c63103 in glXSwapBuffers () from /usr/lib/i386-linux-gnu/libGL.so.1 No symbol table info available. #9 0xb1dfc0b0 in ?? () from /usr/lib/i386-linux-gnu/qt5/plugins/xcbglintegrations/libqxcb-glx-integration.so No symbol table info available. #10 0xb5537801 in QOpenGLContext::swapBuffers(QSurface*) () from /usr/lib/i386-linux-gnu/sse2/libQt5Gui.so.5 No symbol table info available. #11 0xb760efaf in ?? () from /usr/lib/i386-linux-gnu/libQt5Quick.so.5 No symbol table info available. #12 0xb76101c8 in ?? () from /usr/lib/i386-linux-gnu/libQt5Quick.so.5 No symbol table info available. #13 0xb6325f6a in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5 No symbol table info available. #14 0xb632b7fc in QApplication::notify(QObject*, QEvent*) () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5 No symbol table info available. #15 0xb51b3c84 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5 No symbol table info available. #16 0xb520a0bd in QTimerInfoList::activateTimers() () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5 No symbol table info available. #17 0xb520a689 in ?? () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5 No symbol table info available. #18 0xb4516ee9 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0 No symbol table info available. #19 0xb4517189 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0 No symbol table info available. #20 0xb4517254 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0 No symbol table info available. #21 0xb520b233 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5 No symbol table info available. #22 0xb1cfdc71 in ?? () from /usr/lib/i386-linux-gnu/libQt5XcbQpa.so.5 No symbol table info available. #23 0xb51b12d6 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5 No symbol table info available. #24 0xb51b170a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5 No symbol table info available. #25 0xb51ba3a5 in QCoreApplication::exec() () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5 No symbol table info available. #26 0xb54ed211 in QGuiApplication::exec() () from /usr/lib/i386-linux-gnu/sse2/libQt5Gui.so.5 No symbol table info available. #27 0xb6322b14 in QApplication::exec() () from /usr/lib/i386-linux-gnu/libQt5Widgets.so.5 No symbol table info available. #28 0x8005b64e in main (argc=<optimized out>, argv=<optimized out>) at /build/kdenlive-txSbfO/kdenlive-16.04.3/src/main.cpp:130 app = <incomplete type> aboutData = {d = 0x806f62d0} parser = {d = 0x806f6be8} programDBusService = <incomplete type> result = <optimized out> I now see this bears an uncanny resemblance to a known problem: https://bugs.freedesktop.org/show_bug.cgi?id=93197 Thanks, Kingsley -- Time is the fire in which we all burn.