[Bug backtrace/20746] New: hit assert, when 'thread apply all bt' in noninteractive mode.

["v at tenable dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20746

            Bug ID: 20746
           Summary: hit assert, when 'thread apply all bt' in
                    noninteractive mode.
           Product: gdb
           Version: 7.8
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: backtrace
          Assignee: unassigned at sourceware dot org
          Reporter: v at tenable dot com
  Target Milestone: ---

Created attachment 9601
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9601&action=edit
3 .txt files, each with result of respective noninteractive gdb invocation.

===============
=== symptom ===

Behavior varies slightly, depending on exact commands given; in attached
tarchive, please find output copy for 3 variants, as resulting from,
respectively,

    $ gdb --nx --pid 119377 --batch --ex 'set print address off' --ex 'thread
apply all bt'

    $ gdb --nx --pid 119377 --batch --ex 'thread apply all bt'

    $ gdb --nx --pid 119377 --ex 'thread apply all bt'

In each case, process was left in state "S", and returned to normal operation
when sent SIGCONT.


=====================
=== about the GDB ===

$ gdb --version
GNU gdb (GDB) 7.8.2
Copyright (C) 2014 Free Software Foundation, Inc.
/*** ...legal... ***/
This GDB was configured as "x86_64-unknown-linux-gnu".
Type "show configuration" for configuration details.

(gdb) show configuration
This GDB was configured as follows:
   configure --host=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu
             --with-auto-load-dir=$debugdir:$datadir/auto-load
             --with-auto-load-safe-path=$debugdir:$datadir/auto-load
             --without-expat
             --with-gdb-datadir=/usr/local/share/gdb (relocatable)
             --with-jit-reader-dir=/usr/local/lib/gdb (relocatable)
             --without-libunwind-ia64
             --without-lzma
             --with-python=/usr/local (relocatable)
             --without-guile
             --with-separate-debug-dir=/usr/local/lib/debug (relocatable)
             --with-zlib
             --without-babeltrace

(Was built from source, but only option given explicitly was --with-python.)


=====================
=== about the GCC ===

$ g++ -v

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-unknown-linux-gnu/5.4.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /tmp/gcc-src/gcc-5.4.0/configure --disable-bootstrap
--disable-decimal-float --disable-fixed-point --disable-libgomp
--disable-libquadmath --disable-libssp --disable-libvtv --disable-multiarch
--disable-multilib --disable-nls --disable-stage1-checking
--disable-version-specific-runtime-libs --disable-werror --enable-c99
--enable-checking=release --enable-clocale=gnu --enable-__cxa_atexit
--enable-gold --enable-languages=c,c++ --enable-libstdcxx-time=rt
--enable-shared=libgcc,libstdc++ --enable-threads=posix --enable-tls
--enable-valgrind-annotations --with-diagnostics-color=auto
--with-glibc-version=2.12
--with-pkgversion=''\''from-source__25-Aug-2016__BenchLCE2'\'''
--with-system-zlib --without-cloog --without-isl --without-ppl
Thread model: posix
gcc version 5.4.0 ('from-source__25-Aug-2016__BenchLCE2'


========================
=== about the binary ===

$ file lced

lced: setuid setgid ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux),
dynamically linked (uses shared libs), for GNU/Linux 2.6.18, not stripped


======================================
=== GCC flags used to build binary ===

-fmax-errors=10 -fmessage-length=0 -fno-show-column -fno-strict-aliasing
-ftrapv -march=x86-64 -pipe -Wall -Wcast-align -Wextra -Wfloat-equal -Wformat=2
-Wframe-larger-than=10485760 -Winit-self -Wlarger-than=10485760
-Wmissing-include-dirs -Wno-format-y2k -Wno-sign-compare -Wno-sign-conversion
-Wpacked -Wpointer-arith -Wredundant-decls -Wshadow -Wuninitialized -Wunused
-Wswitch-bool -Wsizeof-array-argument -D__FILENAME__='"$(notdir $<)"'
-static-libstdc++ -std=gnu++11 -Wno-float-conversion -Wlogical-op
-Woverloaded-virtual -Wunused-parameter -Wodr -Wsuggest-final-methods
-Wsuggest-final-types -fno-rtti


==================
=== about host ===

$ uname -srvpio
Linux 2.6.32-573.el6.x86_64 #1 SMP Thu Jul 23 15:44:03 UTC 2015 x86_64 x86_64
GNU/Linux

$ cat /etc/redhat-release 
CentOS release 6.7 (Final)


=======================
=== about the glibc ===

$  /lib64/libc.so.6        

GNU C Library stable release version 2.12, by Roland McGrath et al.
Copyright (C) 2010 Free Software Foundation, Inc.
/*** ...legal... ***/
Compiled by GNU CC version 4.4.7 20120313 (Red Hat 4.4.7-16).
Compiled on a Linux 2.6.32 system on 2015-07-23.
Available extensions:
        The C stubs add-on version 2.1.2.
        crypt add-on version 2.1 by Michael Glad and others
        GNU Libidn by Simon Josefsson
        Native POSIX Threads Library by Ulrich Drepper et al
        BIND-8.2.3-T5B
        RT using linux kernel aio
libc ABIs: UNIQUE IFUNC

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