[sword-devel] Segmentation fault - was Re: SWORD 1.7.0RC3

DM Smith dmsmith at crosswire.org
Wed Sep 11 12:35:07 MST 2013 

The C++ standard does specify order w/in a file (top down), but not across files. This fact can be used to order across files by using a global from one to initialize a global another. Don't recommend it, but it is nice when it is a must.

-- DM

On Sep 11, 2013, at 12:56 PM, "Troy A. Griffitts" <scribe at crosswire.org> wrote:

> Jaak, I disagree that your comments have anything to do with this problem. I have confirmed that the 3 file globals immediately preceding the problem global have been initialized. I doubt you are saying the c++ standard doesn't support initializing a global array and then initializing a global std::list with the members of this array, all in the same object file. I know the spec doesn't assure global initialization order across object files, but within the same object file, I find it hard to believe there is no specification to the order.
> 
> Jaak Ristioja <jaak at ristioja.ee> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> It's not a compiler bug.
> 
> Basically the C++ standard does not enforce an initialization order
> for globals. So the compiler is free to initialize such stuff in any
> order. I think your toolchain just happens to be lucky enough to do
> that in an the order which doesn't yield in a crash.
> 
> I don't have the time to look this up in the C++ standards myself, but
> you can google such stuff:
> 
> http://stackoverflow.com/questions/3746238/c-global-initialization-order-ignores-dependencies
> 
> 
> Blessings,
> Jaak
> 
> On 10.09.2013 18:12, Troy A. Griffitts wrote:
> Hey Jaak,
> 
> Thank, yeah, but why?  :)
> 
> My investigation turns up:
> 
> shared build works fine and valgrinds clean static build on g++
> (GCC) 4.8.1 (F19) fails static build on g++ (GCC) 4.4.7 (RHEL 6.4)
> works fine and valgrinds clean
> 
> In the error case, it seems that std::list's c-tor(iterator start, 
> iterator end) doesn't get called appropriately, though all the
> other file globals get initialized just fine.
> 
> I moved the global filter in the utility to a stack variable and
> it alleviates the problem, but still wonder why the problem in the
> first place.
> 
> Any advice would be appreciated.  If I'm doing something wrong, I'd
> like to change it, but right now I'm going with "compiler bug" :)
> 
> Troy
> 
> 
> 
> 
> 
> On 09/10/2013 08:20 AM, Jaak Ristioja wrote: I'm pretty sure that
> the crash is because the global
> 
> const StringList oValues(&choices[0], &choices[2]);
> 
> in ../src/modules/filters/utf8greekaccents.cpp:41 is not
> initialized when it is used in UTF8GreekAccents::UTF8GreekAccents()
> to initialize the global
> 
> UTF8GreekAccents greekAccentsFilter;
> 
> instance in imp2gbs.cpp:62.
> 
> 
> Blessings, Jaak
> 
> On 10.09.2013 02:02, Peter von Kaehne wrote:
> I hate to bring this up, now, when we really all want 1.7
> out, but current svn head produces a segmentation fault in
> imp2gbs. The other utilities insofar as I tested them seem to
> be fine.
> 
> Below the stacktrace. Tell me if you need more. I basically
> use usrinst.sh produced binaries, with the only modification
> that I changed the install directory to /usr/local/bin
> 
> 
> 
> peter at peter-ThinkPad-Twist:~/Source/sword$ gdb 
> /usr/local/bin/imp2gbs GNU gdb (GDB) 7.5-ubuntu Copyright (C)
> 2012 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 "i686-linux-gnu". For bug reporting
> instructions, please see: 
> <http://www.gnu.org/software/gdb/bugs/>... Reading symbols
> from /usr/local/bin/imp2gbs...done. (gdb) r Starting
> program: /usr/local/bin/imp2gbs
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x08050b7a in sword::SWBuf::c_str (this=0x8) at
> ../include/swbuf.h:141 141 inline const char *c_str() const{
> return buf; } (gdb) bt #0 0x08050b7a in sword::SWBuf::c_str
> (this=0x8) at ../include/swbuf.h:141 #1  0x0805a790 in 
> sword::SWOptionFilter::setOptionValue (this=0x8115b60 
> <greekAccentsFilter>, ival=0x80c715b "On") at 
> ../src/modules/filters/swoptfilter.cpp:51 #2  0x0805aca2 in 
> sword::UTF8GreekAccents::UTF8GreekAccents (this=0x8115b60 
> <greekAccentsFilter>, __in_chrg=<optimised out>, 
> __vtt_parm=<optimised out>) at 
> ../src/modules/filters/utf8greekaccents.cpp:43 #3  0x0805099d
> in __static_initialization_and_destruction_0
> (__initialize_p=1, __priority=65535) at imp2gbs.cpp:62 #4
> 0x080509df in _GLOBAL__sub_I_imp2gbs.cpp(void) () at
> imp2gbs.cpp:273 #5 0x080c6ae2 in __libc_csu_init () #6
> 0xb77f046a in __libc_start_main () from
> /lib/i386-linux-gnu/libc.so.6 #7 0x0804f931 in _start ()
> (gdb) #0  0x08050b7a in sword::SWBuf::c_str (this=0x8) at
> ../include/swbuf.h:141 #1  0x0805a790 in 
> sword::SWOptionFilter::setOptionValue (this=0x8115b60 
> <greekAccentsFilter>, ival=0x80c715b "On") at 
> ../src/modules/filters/swoptfilter.cpp:51 #2  0x0805aca2 in 
> sword::UTF8GreekAccents::UTF8GreekAccents (this=0x8115b60 
> <greekAccentsFilter>, __in_chrg=<optimised out>, 
> __vtt_parm=<optimised out>) at 
> ../src/modules/filters/utf8greekaccents.cpp:43 #3  0x0805099d
> in __static_initialization_and_destruction_0
> (__initialize_p=1, __priority=65535) at imp2gbs.cpp:62 #4
> 0x080509df in _GLOBAL__sub_I_imp2gbs.cpp(void) () at
> imp2gbs.cpp:273 #5 0x080c6ae2 in __libc_csu_init () #6
> 0xb77f046a in __libc_start_main () from
> /lib/i386-linux-gnu/libc.so.6 #7 0x0804f931 in _start ()
> (gdb) #0  0x08050b7a in sword::SWBuf::c_str (this=0x8) at
> ../include/swbuf.h:141 #1  0x0805a790 in 
> sword::SWOptionFilter::setOptionValue (this=0x8115b60 
> <greekAccentsFilter>, ival=0x80c715b "On") at 
> ../src/modules/filters/swoptfilter.cpp:51 #2  0x0805aca2 in 
> sword::UTF8GreekAccents::UTF8GreekAccents (this=0x8115b60 
> <greekAccentsFilter>, __in_chrg=<optimised out>, 
> __vtt_parm=<optimised out>) at 
> ../src/modules/filters/utf8greekaccents.cpp:43 #3  0x0805099d
> in __static_initialization_and_destruction_0
> (__initialize_p=1, __priority=65535) at imp2gbs.cpp:62 #4
> 0x080509df in _GLOBAL__sub_I_imp2gbs.cpp(void) () at
> imp2gbs.cpp:273 #5 0x080c6ae2 in __libc_csu_init () #6
> 0xb77f046a in __libc_start_main () from
> /lib/i386-linux-gnu/libc.so.6 #7 0x0804f931 in _start ()
> (gdb)
> 
> 
> 
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