Re: [Valgrind-users] what are the commands to check this scheduler code?

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Hi ,

how to resolve this issue, invalid read of size 4 and Process terminating with default action of signal 11 (SIGSEGV) ?

martin@ubuntu:~/Downloads/tasks$ valgrind --leak-check=yes casio_system
valgrind: casio_system: command not found
martin@ubuntu:~/Downloads/tasks$ valgrind --leak-check=yes ./casio_system
==15478== Memcheck, a memory error detector
==15478== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==15478== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==15478== Command: ./casio_system
==15478==
Usage: ./casio_system file_name (system configuration)
==15478==
==15478== HEAP SUMMARY:
==15478==     in use at exit: 0 bytes in 0 blocks
==15478==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==15478==
==15478== All heap blocks were freed -- no leaks are possible
==15478==
==15478== For counts of detected and suppressed errors, rerun with: -v
==15478== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
martin@ubuntu:~/Downloads/tasks$ valgrind --leak-check=yes ./casio_system a
==15479== Memcheck, a memory error detector
==15479== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==15479== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==15479== Command: ./casio_system a
==15479==
==15479== Invalid read of size 4
==15479==    at 0x40FFB4B: fgets (iofgets.c:50)
==15479==    by 0x8048D36: get_casio_tasks_config_info (in /home/martin/Downloads/tasks/casio_system)
==15479==    by 0x8048E95: main (in /home/martin/Downloads/tasks/casio_system)
==15479==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==15479==
==15479==
==15479== Process terminating with default action of signal 11 (SIGSEGV)
==15479==  Access not within mapped region at address 0x0
==15479==    at 0x40FFB4B: fgets (iofgets.c:50)
==15479==    by 0x8048D36: get_casio_tasks_config_info (in /home/martin/Downloads/tasks/casio_system)
==15479==    by 0x8048E95: main (in /home/martin/Downloads/tasks/casio_system)
==15479==  If you believe this happened as a result of a stack
==15479==  overflow in your program's main thread (unlikely but
==15479==  possible), you can try to increase the size of the
==15479==  main thread stack using the --main-stacksize= flag.
==15479==  The main thread stack size used in this run was 8388608.
==15479==
==15479== HEAP SUMMARY:
==15479==     in use at exit: 0 bytes in 0 blocks
==15479==   total heap usage: 1 allocs, 1 frees, 352 bytes allocated
==15479==
==15479== All heap blocks were freed -- no leaks are possible
==15479==
==15479== For counts of detected and suppressed errors, rerun with: -v
==15479== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)

Regards,

Martin

________________________________
From: Mandy Martino <te...@ho...>
Sent: Sunday, February 14, 2016 23:25
To: val...@li...
Subject: [Valgrind-users] what are the commands to check this scheduler code?

Hi

There is a need to recompile kernel to patch this module, how to check and step by step debug run this scheduler with valgrind before patch to kernel ?

what are the commands to check this scheduler code?

http://www.embedded.com/design/operating-systems/4204980/Real-Time-Linux-Scheduling-Part-3

[http://www.embedded.com/content/images/icons/contentitem-default.png]<http://www.embedded.com/design/operating-systems/4204980/Real-Time-Linux-Scheduling-Part-3>

Implementing a new real-time scheduling policy for Linux ...<http://www.embedded.com/design/operating-systems/4204980/Real-Time-Linux-Scheduling-Part-3>
www.embedded.com
Implementing a new real-time scheduling policy for Linux: Part 3. Paulo Baltarejo Sousa and Luis Lino Ferreira, Polytechnic Institute of Porto July 28 ...

Regards,

Martin