$ gdb attach 29 GNU gdb (Ubuntu 8.1-0ubuntu2) 8.1 Copyright (C) 2018 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later 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: . Find the GDB manual and other documentation resources online at: . For help, type "help". Type "apropos word" to search for commands related to "word"... attach: No such file or directory. Attaching to process 29 [New LWP 32] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 0x00007f7c80cdd9f3 in futex_wait_cancelable (private=, expected=0, futex_word=0x7fffe7633a40) at ../sysdeps/unix/sysv/linux/futex-internal.h:88 88 ../sysdeps/unix/sysv/linux/futex-internal.h: No such file or directory. (gdb) cont Continuing. Thread 1 "tkscidb-beta" received signal SIGSEGV, Segmentation fault. 0x00007f7c8163a518 in ?? () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so (gdb) bt #0 0x00007f7c8163a518 in ?? () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #1 0x00007f7c81639c69 in ?? () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #2 0x00007f7c82cf6b89 in MakeTransparentWindowExist (tkwin=0x7f7c7c0c65f0, parent=3145758) at tk_busy.cpp:871 #3 0x00007f7c82cf6f56 in CreateBusy (interp=0x7fffe763ddf0, tkRef=0x7fffe7964ba0) at tk_busy.cpp:1016 #4 0x00007f7c82cf71e6 in HoldBusy ( busyTablePtr=0x7f7c8353db60 , interp=0x7fffe763ddf0, windowObj=0x7f7c74f85150, configObjc=0, configObjv=0x7fffe7642840) at tk_busy.cpp:1171 #5 0x00007f7c82cf77bd in ScBusyObjCmd (clientData=0x0, interp=0x7fffe763ddf0, objc=3, objv=0x7fffe7642828) at tk_busy.cpp:1342 #6 0x00007f7c82c55c09 in safeCall ( clientData=0x7f7c82cf7278 , ti=0x7fffe763ddf0, objc=3, objv=0x7fffe7642828) at tcl_base.cpp:1006 #7 0x00007f7c8159b406 in TclNRRunCallbacks () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #8 0x00007f7c823871a4 in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #9 0x00007f7c8238d61c in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #10 0x00007f7c8159b406 in TclNRRunCallbacks () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #11 0x00007f7c8238e2da in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #12 0x00007f7c823871a4 in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #13 0x00007f7c8238d61c in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #14 0x00007f7c8159b406 in TclNRRunCallbacks () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #15 0x00007f7c8238e2da in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #16 0x00007f7c823871a4 in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #17 0x00007f7c8238d61c in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #18 0x00007f7c8159b406 in TclNRRunCallbacks () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #19 0x00007f7c8159bfba in ?? () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #20 0x00007f7c8159ba63 in Tcl_EvalEx () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #21 0x00007f7c822d5d65 in Tk_BindEvent () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #22 0x00007f7c822dc5ad in TkBindEventProc () from /usr/lib/x86_64-linux-gnu/libtk8.6.so ---Type to continue, or q to quit---\ #23 0x00007f7c822e47d3 in Tk_HandleEvent () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #24 0x00007f7c822e4f80 in ?? () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #25 0x00007f7c81663787 in Tcl_ServiceEvent () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #26 0x00007f7c816639d6 in Tcl_DoOneEvent () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so #27 0x00007f7c822e53d2 in Tk_MainLoop () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #28 0x00007f7c822f3a7a in Tk_MainEx () from /usr/lib/x86_64-linux-gnu/libtk8.6.so #29 0x00007f7c82c4cd95 in main (argc=2, argv=0x7fffee3d6488) at tkscidb.cpp:110