Tcl Source Code

Up to at least commit [45fa0ff557cfdb12], the command,

make TESTFLAGS='-file "unload.test winPipe.test"' gdb-test

, produces the results below. The problem is that in some cases, although the library is unloaded its record is not removed from the per-interp list of loaded libraries, and subsequent calls to TclGetLoadedLibraries() attempt to acces the record, whose storage has already been freed.

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7a2d5e2 in __strcmp_sse2_unaligned () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007ffff7a2d5e2 in __strcmp_sse2_unaligned () from /usr/lib/libc.so.6
#1  0x00007ffff7eda1d0 in TclGetLoadedLibraries (interp=0x555555584a70, targetName=0x7ffff7fc3550 <tclEmptyString> "", prefix=0x555555711b10 "Tcltest") at /path/to/src/generic/tclLoad.c:1092
#2  0x00007ffff7dbbd7b in InfoLoadedCmd (dummy1681=0x0, interp=0x555555584a70, objc=3, objv=0x55555565c940) at /path/to/src/generic/tclCmdIL.c:1703
#3  0x00007ffff7d9f195 in Dispatch (data=0x55555574b478, interp=0x555555584a70, dummy4779=0) at /path/to/src/generic/tclBasic.c:4817
#4  0x00007ffff7d9f21b in TclNRRunCallbacks (interp=0x555555584a70, result=0, rootPtr=0x0) at /path/to/src/generic/tclBasic.c:4857
#5  0x00007ffff7d9eadd in Tcl_EvalObjv (interp=0x555555584a70, objc=3, objv=0x5555555c3a20, flags=2097168) at /path/to/src/generic/tclBasic.c:4576
#6  0x00007ffff7da11b0 in TclEvalEx (interp=0x555555584a70, 
    script=0x5555555e0cb0 "# all.tcl --\n#\n# This file contains a top-level script to run all of the Tcl\n# tests.  Execute it by invoking \"source all.tcl\" when running tcltest\n# in this directory.\n#\n# Copyright © 1998-1999 Scri"..., numBytes=1012, flags=0, line=26, clNextOuter=0x0, 
    outerScript=0x5555555e0cb0 "# all.tcl --\n#\n# This file contains a top-level script to run all of the Tcl\n# tests.  Execute it by invoking \"source all.tcl\" when running tcltest\n# in this directory.\n#\n# Copyright © 1998-1999 Scri"...) at /path/to/src/generic/tclBasic.c:5728
#7  0x00007ffff7ecc0e9 in Tcl_FSEvalFileEx (interp=0x555555584a70, pathPtr=0x5555555cbc60, encodingName=0x7ffff7f7d94c "utf-8") at /path/to/src/generic/tclIOUtil.c:1782
#8  0x00007ffff7edabfe in Tcl_MainEx (argc=-1, argv=0x7fffffffe2f8, appInitProc=0x5555555563bc <Tcl_AppInit>, interp=0x555555584a70) at /path/to/src/generic/tclMain.c:399
#9  0x00005555555563b5 in main (argc=6, argv=0x7fffffffe2c8) at /path/to/src/unix/tclAppInit.c:91

Should this be backported to 8.6?

Merged to core-8-branch in [7ffa017f9b76bf5d].

Fixed in [343281a570d47661].