Re: Buffer Overflow Detected

[Stéphane Raimbault]

Could you share the source code of your newserver program and the output of this program with the debug mode enabled (http://libmodbus.org/docs/v3.1.4/modbus_set_debug.html)?

2017-07-19 0:57 GMT+02:00 Arvind Allawadi <allawad...@gmail.com>:

Hello all libmodbus community,
One time I was able to run a code for the server-client (default: tcp) on the same machine running ubuntu in two different shells; but, now I again I am getting a buffer overflow detected error.

If I could get any help that would be really great.  I am testing the code for Jetson TK1, for which my ultimate goal is to use modbus through RTS485 driver.

./newserver
Waiting for an indication...
*** buffer overflow detected ***: ./newserver terminated
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.

6(+0x777e5)[0x7f6556ad17e5]
/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f6556b7311c]
/lib/x86_64-linux-gnu/libc.so.6(+0x117120)[0x7f6556b71120]
/lib/x86_64-linux-gnu/libc.so.6(+0x119067)[0x7f6556b73067]
/usr/local/lib/libmodbus.so.5(_modbus_receive_msg+0x6c)[0x7f6556e282bc]
./newserver[0x401482]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f6556a7a830]
./newserver[0x401079]
======= Memory map: ========
00400000-00402000 r-xp 00000000 08:05 1060826                            /home/arvindall/Desktop/libmodbus-master /tests/newserver
00601000-00602000 r--p 00001000 08:05 1060826                            /home/arvindall/Desktop/libmodbus-master /tests/newserver
00602000-00603000 rw-p 00002000 08:05 1060826                            /home/arvindall/Desktop/libmodbus-master /tests/newserver
025d5000-025f6000 rw-p 00000000 00:00 0                                  [heap]
7f6556844000-7f655685a000 r-xp 00000000 08:05 660720                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f655685a000-7f6556a59000 ---p 00016000 08:05 660720                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f6556a59000-7f6556a5a000 rw-p 00015000 08:05 660720                     /lib/x86_64-linux-gnu/libgcc_s.so.1
7f6556a5a000-7f6556c1a000 r-xp 00000000 08:05 669233                     /lib/x86_64-linux-gnu/libc-2.23.so
7f6556c1a000-7f6556e1a000 ---p 001c0000 08:05 669233                     /lib/x86_64-linux-gnu/libc-2.23.so
7f6556e1a000-7f6556e1e000 r--p 001c0000 08:05 669233                     /lib/x86_64-linux-gnu/libc-2.23.so
7f6556e1e000-7f6556e20000 rw-p 001c4000 08:05 669233                     /lib/x86_64-linux-gnu/libc-2.23.so
7f6556e20000-7f6556e24000 rw-p 00000000 00:00 0
7f6556e24000-7f6556e2e000 r-xp 00000000 08:05 543359                     /usr/local/lib/libmodbus.so.5.1.0
7f6556e2e000-7f655702e000 ---p 0000a000 08:05 543359                     /usr/local/lib/libmodbus.so.5.1.0
7f655702e000-7f655702f000 r--p 0000a000 08:05 543359                     /usr/local/lib/libmodbus.so.5.1.0
7f655702f000-7f6557030000 rw-p 0000b000 08:05 543359                     /usr/local/lib/libmodbus.so.5.1.0
7f6557030000-7f6557056000 r-xp 00000000 08:05 660831                     /lib/x86_64-linux-gnu/ld-2.23.so
7f6557235000-7f6557238000 rw-p 00000000 00:00 0
7f6557252000-7f6557255000 rw-p 00000000 00:00 0
7f6557255000-7f6557256000 r--p 00025000 08:05 660831                     /lib/x86_64-linux-gnu/ld-2.23.so
7f6557256000-7f6557257000 rw-p 00026000 08:05 660831                     /lib/x86_64-linux-gnu/ld-2.23.so
7f6557257000-7f6557258000 rw-p 00000000 00:00 0
7fff95028000-7fff95049000 rw-p 00000000 00:00 0                          [stack]
7fff95137000-7fff95139000 r--p 00000000 00:00 0                          [vvar]
7fff95139000-7fff9513b000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
Aborted (core dumped)

--
Vous recevez ce message, car vous êtes abonné au groupe Google Groupes "libmodbus".
Pour vous désabonner de ce groupe et ne plus recevoir d'e-mails le concernant, envoyez un e-mail à l'adresse libmodbus+unsubscribe@googlegroups.com.
Pour obtenir davantage d'options, consultez la page https://groups.google.com/d/optout.

[Sarang Kalbande]

Hi,
I faced the same issue,but the issue is not with the SDK.
This happens because previous instance of the program is already running and it is not closed gracefully.
I would request you to check if previous program is still running in the background if yes the kill it and re run your application
This would solve your problem

Pour vous désabonner de ce groupe et ne plus recevoir d'e-mails le concernant, envoyez un e-mail à l'adresse libmodbus+...@googlegroups.com.