On 4/13/17 11:41 AM, Reuben Thomas wrote: > This is not the result I obtained. I simply ran gdb on the bash binary, > valgrind was not involved.
If you didn't build the binary yourself, you don't know what changes were made to it. Here's what I got on Fedora 25. [chet@caleb-fedora25 bash-20170407]$ ./bash --version GNU bash, version 4.4.12(1)-maint (x86_64-unknown-linux-gnu) Copyright (C) 2016 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. [chet@caleb-fedora25 bash-20170407]$ gdb ./bash GNU gdb (GDB) Fedora 7.12-24.fc25 Copyright (C) 2016 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-redhat-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"... Reading symbols from ./bash...done. (gdb) b xfree Breakpoint 1 at 0x47e180: file /home/chet/src/bash-20170407/xmalloc.c, line 147. (gdb) r -c '' Starting program: /home/chet/build/bash-20170407/bash -c '' Missing separate debuginfos, use: dnf debuginfo-install glibc-2.24-3.fc25.x86_64 Breakpoint 1, xfree (string=0x7bd218) at /home/chet/src/bash-20170407/xmalloc.c:147 147 if (string) Missing separate debuginfos, use: dnf debuginfo-install ncurses-libs-6.0-6.20160709.fc25.x86_64 (gdb) s 148 free (string); (gdb) s free (mem=0x7bd218) at /home/chet/src/bash-20170407/lib/malloc/malloc.c:1338 1338 internal_free (mem, (char *)NULL, 0, 0); (gdb) s internal_free (mem=0x7bd218, file=0x0, line=0, flags=0) at /home/chet/src/bash-20170407/lib/malloc/malloc.c:868 868 if ((ap = (char *)mem) == 0) (gdb) -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU c...@case.edu http://cnswww.cns.cwru.edu/~chet/
