[Buildroot] wide-dhcpv6 crash when built in buildroot version 2014.05 using a cross toolchain arm-buildroot-linux-gnueabihf with gcc version 4.8.3

[Buildroot] wide-dhcpv6 crash when built in buildroot version 2014.05 using a cross toolchain arm-buildroot-linux-gnueabihf with gcc version 4.8.3

[Srinivasan R]

Hi All,
I am using the latest version of buildroot (2014.05) for my project, I happen to port the wide-dhcpv6 package which I had in the previous version(buildroot-2010.05) to the current buildroot version(2014.05).

The wide-dhcpv6 in buildroot version(2014.05) is working good with the toolcahain "arm-none-linux-gnueabi" using the gcc version "4.3.3", when I port this package in to the latest version, initially I got the below build error.
Please note the current version used is "buildroot version 2014.05 using a cross toolchain arm-buildroot-linux-gnueabihf with gcc version 4.8.3"

In file included from dhcp6c.c:75:0:
./common.h:158:13: error: conflicting types for ?dprintf?
extern void dprintf __P((int, const char *, const char *, ...));

I browsed the net and added the line "cd $(WIDE_DHCPV6_DIR); perl -pi -e "s/dprintf/debug_printf/g" *.c *.h *.l;" in my "wide-dhcpv6.mk", with this fix I could able to generate the binary (dhcp6c) successfully.

When I run the binary (dhcp6c) in the board Atmel series, it gives me the segmentation fault.The application crashes even much before the main() function hits.

I used the gdb server to debug it the application, and I found that the "dhcp6c" crashes in the file "lex.yy.c" in the function yy_get_previous_state(). below is the stepping in to the function and crash output.
"(gdb) target remote 192.168.1.53:3646
Remote debugging using 192.168.1.53:3646
yy_get_previous_state () at lex.yy.c:1994
warning: Source file is more recent than executable.
1994 yy_current_state = (yy_start);
(gdb) b main
Breakpoint 1 at 0x8a0c: file dhcp6c.c, line 159.
(gdb) n
1990 {
(gdb)
1996 for ( yy_cp = (yytext_ptr) + YY_MORE_ADJ; yy_cp < (yy_c_buf_p); ++yy_cp )
(gdb)
2004 while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
(gdb)
1996 for ( yy_cp = (yytext_ptr) + YY_MORE_ADJ; yy_cp < (yy_c_buf_p); ++yy_cp )
(gdb)
2014 }
(gdb)
yy_get_previous_state () at lex.yy.c:2014
2014 }
Could not insert single-step breakpoint at 0x0
(gdb)
yy_get_previous_state () at lex.yy.c:2014
2014 }
Could not insert single-step breakpoint@0x0
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
(gdb) bt
#0 0x00000000 in ?? ()
#1 0x00000000 in ?? ()
(gdb) "
Since it crashes in lexical analyzer, I have no clue how to debug this issue, and I strongly have a belief that the problem might be related to toolchain. Also since my project deliveries are nearing I don't have much time to investigate this issue, can anybody help me to resolve this issue. Attached is my make file "wide-dhcpv6.mk" and build output log "wide-dhcpv6-20080615/config.log"

I believe the attached log file and the make file will have all the necessary information about the toolchain used and the configurations/rules used to built the application for your first level diagnostic. if any additional information is required I am could able to provide you very promptly.

Thanks in advance for help.

Regards,
Srini.
 
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[Buildroot] wide-dhcpv6 crash when built in buildroot version 2014.05 using a cross toolchain arm-buildroot-linux-gnueabihf with gcc version 4.8.3

[Gustavo Zacarias]

On 04/14/2015 03:25 PM, Srinivasan R wrote:

> Hi All,
> I am using the latest version of buildroot (2014.05) for my project, I happen to port the wide-dhcpv6 package which I had in the previous version(buildroot-2010.05) to the current buildroot version(2014.05).

Hi.
Well, the package hasn't been ported to any modern package format, so
debugging an old (very old) package just thrown into a new buildroot
version is generally a no-go since the old style hasn't been accepted or
used for a long time.
Otherwise there are many things that could go wrong.
Also you don't specify the precise target or a defconfig to check.
I suggest you convert the package to a generic one (look at the manual),
try again and see if it still fails.
Alternatively if you're in such a rush you could use dibbler which is a
far more modern/maintained DHCPv6 client/server/relay.
Regards.

[Buildroot] wide-dhcpv6 crash when built in buildroot version 2014.05 using a cross toolchain arm-buildroot-linux-gnueabihf with gcc version 4.8.3

[Gustavo Zacarias]

On 04/15/2015 08:27 AM, Srinivasan R wrote:

> Hi Gustavo Zacarias,
>   Thanks for reply,
> Can you please give me any link for the manual that gives the example of newer make file format that buildroot's latest version will accept?
> Meantime, the defconfig I am using is "toro_defconfig".
> 
> Regards,
> Srini.

Hi.
Please keep the list in cc@
There's no such thing as toro_defconfig in vanilla buildroot, so it's
either a fork/customized.
The documents are online, see:
http://www.buildroot.net/downloads/manual/manual.html#generic-package-reference
A quick generic package to use as sample could be eeprog, there are many
others, it depends on the complexity you're facing.
Regards.