[so] [Tema4][Linux] Memcheck failed

[Razvan Crainea]

Salut, Rareș!

Cel mai probabil nu aștepți toate thread-urile, de acolo apare leak-ul.
Legat de faptul că că procesul este omorât, poți verifica log-urile de
sistem să te asiguri că nu este un crash?

Numai bine,
Răzvan

On Tue, Apr 23, 2019 at 9:10 PM Rares Folea via so <so at cursuri.cs.pub.ro> wrote:
>
> Buna seara!
>
> Ma confrunt cu urmatoarele probleme referitoare la testele de memorie:
>
> La rularea pe masina virtuala cu valgrind a testelor 15 si 19 (14 si 18 pe vmchecker), obtin 2 erori similare:
>
> ==4684== 288 bytes in 1 blocks are possibly lost in loss record 2 of 2
> ==4684==    at 0x4C3204A: calloc (vg_replace_malloc.c:762)
> ==4684==    by 0x40134A6: allocate_dtv (dl-tls.c:286)
> ==4684==    by 0x40134A6: _dl_allocate_tls (dl-tls.c:530)
> ==4684==    by 0x5049227: allocate_stack (allocatestack.c:627)
> ==4684==    by 0x5049227: pthread_create@@GLIBC_2.2.5 (pthread_create.c:644)
> ==4684==    by 0x4E3E65B: so_fork (in /home/student/l3-so-assignments/4-scheduler/checker-lin/libscheduler.so)
> ==4684==    by 0x10ABDE: test_sched_handler_15 (test_exec.c:282)
> ==4684==    by 0x4E3E47E: start_thread (in /home/student/l3-so-assignments/4-scheduler/checker-lin/libscheduler.so)
> ==4684==    by 0x50486DA: start_thread (pthread_create.c:463)
> ==4684==    by 0x538188E: clone (clone.S:95)
>
> ==4684==      possibly lost: 576 bytes in 2 blocks
>
> ==4684== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
>
> Nu reusesc sa-mi dau seama de la ce ar putea fi cele doua erori si de ce se manifesta doar la aceste doua teste.
> Mentionez ca astept terminarea thread-urilor cu pthread_join, care ar trebui sa efectueze eliberarea resurselor din structura pthread_t.
> In plus, la testul 16 (15 vmchecker), se pare ca valgrind ocupa mult prea multa memorie locala, iar ca urmare este omorat.
>
> student at vagrant:~/l3-so-assignments/4-scheduler/checker-lin$ LD_LIBRARY_PATH=. valgrind --tool=memcheck --track-origins=yes --leak-check=full _test/run_test 16
> ==4693== Memcheck, a memory error detector
> ==4693== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
> ==4693== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
> ==4693== Command: _test/run_test 16
> ==4693==
> Killed
>
>
> Multumesc
> _______________________________________________
> http://ocw.cs.pub.ro/courses/so/info/lista-discutii



-- 
Răzvan Crainea