[Bug python/16470] Crash when inspecting STL containers with GDB pretty print

["xhpohanka at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16470

--- Comment #4 from Jan Pohanka <xhpohanka at gmail dot com> ---
I have compiled GDB 7.6.2 from source and still can reproduce the bug. I'm
running Debian testing.

Can sharing the GDB corefile help?

=thread-group-added,id="i1"
~"GNU gdb (GDB) 7.6.2\n"
~"Copyright (C) 2013 Free Software Foundation, Inc.\n"
~"License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>\nThis is free software: you are free to
change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by
law.  Type \"show copying\"\nand \"show warranty\" for details.\n"
~"This GDB was configured as \"x86_64-unknown-linux-gnu\".\nFor bug reporting
instructions, please see:\n"
~"<http://www.gnu.org/software/gdb/bugs/>.\n"
(gdb) 
-enable-pretty-printing
-gdb-set print object on

source .gdbinit

-file-exec-and-symbols --thread-group i1 /home/honza/dev/test/stl_test/stl_test
-break-insert --thread-group i1 -f
/home/honza/dev/test/stl_test/stl_test.cpp:12
-break-insert --thread-group i1 -t -f main
-exec-run --thread-group i1

-var-create --thread-group i1 - * x
-var-create --thread 1 --frame 0 - * x
-var-list-children var2
-exec-continue --thread 1

-var-update 1 var2^done
(gdb) 
^done
(gdb) 
&"\n"
^done
(gdb) 
&"source .gdbinit\n"
=cmd-param-changed,param="print pretty",value="on"
=cmd-param-changed,param="print vtbl",value="on"
=cmd-param-changed,param="demangle-style",value="gnu-v3"
^done
(gdb) 
&"\n"
^done
(gdb) 
^done
(gdb) 
^done,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x0000000000400952",func="main()",file="stl_test.cpp",fullname="/home/honza/dev/test/stl_test/stl_test.cpp",line="12",thread-groups=["i1"],times="0",original-location="/home/honza/dev/test/stl_test/stl_test.cpp:12"}
(gdb) 
^done,bkpt={number="2",type="breakpoint",disp="del",enabled="y",addr="0x0000000000400906",func="main()",file="stl_test.cpp",fullname="/home/honza/dev/test/stl_test/stl_test.cpp",line="6",thread-groups=["i1"],times="0",original-location="main"}
(gdb) 
=thread-group-started,id="i1",pid="13100"
=thread-created,id="1",group-id="i1"
^running
*running,thread-id="all"
(gdb) 
=library-loaded,id="/lib64/ld-linux-x86-64.so.2",target-name="/lib64/ld-linux-x86-64.so.2",host-name="/lib64/ld-linux-x86-64.so.2",symbols-loaded="0",thread-group="i1"
=library-loaded,id="linux-vdso.so.1",target-name="linux-vdso.so.1",host-name="linux-vdso.so.1",symbols-loaded="0",thread-group="i1"
&"warning: Could not load shared library symbols for linux-vdso.so.1.\nDo you
need \"set solib-search-path\" or \"set sysroot\"?"
&"\n"
=library-loaded,id="/usr/lib/x86_64-linux-gnu/libstdc++.so.6",target-name="/usr/lib/x86_64-linux-gnu/libstdc++.so.6",host-name="/usr/lib/x86_64-linux-gnu/libstdc++.so.6",symbols-loaded="0",thread-group="i1"
=library-loaded,id="/lib/x86_64-linux-gnu/libm.so.6",target-name="/lib/x86_64-linux-gnu/libm.so.6",host-name="/lib/x86_64-linux-gnu/libm.so.6",symbols-loaded="0",thread-group="i1"
=library-loaded,id="/lib/x86_64-linux-gnu/libgcc_s.so.1",target-name="/lib/x86_64-linux-gnu/libgcc_s.so.1",host-name="/lib/x86_64-linux-gnu/libgcc_s.so.1",symbols-loaded="0",thread-group="i1"
=library-loaded,id="/lib/x86_64-linux-gnu/libc.so.6",target-name="/lib/x86_64-linux-gnu/libc.so.6",host-name="/lib/x86_64-linux-gnu/libc.so.6",symbols-loaded="0",thread-group="i1"
=breakpoint-modified,bkpt={number="2",type="breakpoint",disp="del",enabled="y",addr="0x0000000000400906",func="main()",file="stl_test.cpp",fullname="/home/honza/dev/test/stl_test/stl_test.cpp",line="6",thread-groups=["i1"],times="1",original-location="main"}
*stopped,reason="breakpoint-hit",disp="del",bkptno="2",frame={addr="0x0000000000400906",func="main",args=[],file="stl_test.cpp",fullname="/home/honza/dev/test/stl_test/stl_test.cpp",line="6"},thread-id="1",stopped-threads="all",core="0"
=breakpoint-deleted,id="2"
(gdb) 
&"\n"
^done
(gdb) 
^done,name="var1",numchild="0",value="{...}",type="std::list<int,
std::allocator<int> >",thread-id="1",dynamic="1",has_more="1"
(gdb) 
^done,name="var2",numchild="0",value="{...}",type="std::list<int,
std::allocator<int> >",thread-id="1",dynamic="1",has_more="1"
(gdb) 
^done,numchild="1",children=[child={name="var2.<error at 0>",exp="<error at
0>",numchild="35",type="char [35]",thread-id="1"}],has_more="0"
(gdb) 
^running
*running,thread-id="all"
(gdb) 
=breakpoint-modified,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x0000000000400952",func="main()",file="stl_test.cpp",fullname="/home/honza/dev/test/stl_test/stl_test.cpp",line="12",thread-groups=["i1"],times="1",original-location="/home/honza/dev/test/stl_test/stl_test.cpp:12"}
*stopped,reason="breakpoint-hit",disp="keep",bkptno="1",frame={addr="0x0000000000400952",func="main",args=[],file="stl_test.cpp",fullname="/home/honza/dev/test/stl_test/stl_test.cpp",line="12"},thread-id="1",stopped-threads="all",core="0"
(gdb) 
&"\n"
^done
(gdb) 

~"varobj.c:3532: internal-error: c_value_of_variable: Assertion `!value_lazy
(var->value)' failed.\nA problem internal to GDB has been detected,\nfurther
debugging may prove unreliable.\nQuit this debugging session? "
~"(y or n) "
n
~"varobj.c:3532: internal-error: c_value_of_variable: Assertion `!value_lazy
(var->value)' failed.\nA problem internal to GDB has been detected,\nfurther
debugging may prove unreliable.\nCreate a core file of GDB? "
~"(y or n) "

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