https://bugs.kde.org/show_bug.cgi?id=399836
--- Comment #6 from Stamatis Kavvadias <stamatis.kavvad...@gmail.com> --- I found that kwin_x11 symbols are included in the kwin package. I followed the instructions in the page you mention, using gdb from a remote ssh terminal (from my laptop to the desktop). I tried twice to get the backtrace via gdb. The first time there was a kwin process running and no kwin_x11 and the next time the other way round. There has been an update of kwin and plasma packages in-between, but both times gdb cannot provide a backtrace. The first time I was not sure what happened; I provide the output of the second try, bellow. As you will see, it appears kwin_x11 exits normally(!!!) and I cannot get a backtrace. Here is the output of the command used, i.e. gdb --pid `pidof kwin_x11` 2>&1 | tee kwin_x11.gdb ----------- GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git Copyright (C) 2018 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-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". Attaching to process 2460 [New LWP 2462] [New LWP 2480] [New LWP 2542] [New LWP 2637] [New LWP 2652] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 0x00007f13b1348cf6 in __GI_ppoll (fds=0x5574122160c8, nfds=5, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39 39 ../sysdeps/unix/sysv/linux/ppoll.c: No such file or directory. (gdb) c Continuing. [New Thread 0x7f1379ff7700 (LWP 4603)] [Thread 0x7f1379185700 (LWP 2637) exited] [Thread 0x7f1395788700 (LWP 2480) exited] [Thread 0x7f1379ff7700 (LWP 4603) exited] [Thread 0x7f1370f69700 (LWP 2652) exited] [Thread 0x7f138f5e0700 (LWP 2542) exited] [Thread 0x7f13b19e9cc0 (LWP 2460) exited] [Inferior 1 (process 2460) exited with code 01] (gdb) bt No stack. (gdb) detach The program is not being run. (gdb) run Starting program: /usr/bin/kwin_x11 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". /usr/bin/kwin_x11: FATAL ERROR while trying to open display [Inferior 1 (process 10196) exited with code 01] (gdb) quit -- You are receiving this mail because: You are watching all bug changes.
