Public bug reported:
Hello, today I found strange mamory leak in tail today.
Description: Ubuntu 16.04.1 LTS
Release: 16.04
coreutils:
Установлен: 8.25-2ubuntu2
Кандидат: 8.25-2ubuntu2
Таблица версий:
*** 8.25-2ubuntu2 500
500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
In such small test I have got report about memory leak.
valgrind --tool=memcheck --leak-check=full --show-leak-kinds=all
--trace-children=yes bash -c "echo A | tail -n 1"
==11802== Memcheck, a memory error detector
==11802== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==11802== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==11802== Command: bash -c echo\ A\ |\ tail\ -n\ 1
==11802==
==11803==
==11803== HEAP SUMMARY:
==11803== in use at exit: 0 bytes in 0 blocks
==11803== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==11803==
==11803== All heap blocks were freed -- no leaks are possible
==11803==
==11803== For counts of detected and suppressed errors, rerun with: -v
==11803== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==11804== Memcheck, a memory error detector
==11804== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==11804== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==11804== Command: /usr/bin/tail -n 1
==11804==
A
==11804==
==11804== HEAP SUMMARY:
==11804== in use at exit: 96 bytes in 1 blocks
==11804== total heap usage: 101 allocs, 100 frees, 47,390 bytes allocated
==11804==
==11804== 96 bytes in 1 blocks are definitely lost in loss record 1 of 1
==11804== at 0x4C2DB8F: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11804== by 0x409718: ??? (in /usr/bin/tail)
==11804== by 0x4022C8: ??? (in /usr/bin/tail)
==11804== by 0x4E5A82F: (below main) (libc-start.c:291)
==11804==
==11804== LEAK SUMMARY:
==11804== definitely lost: 96 bytes in 1 blocks
==11804== indirectly lost: 0 bytes in 0 blocks
==11804== possibly lost: 0 bytes in 0 blocks
==11804== still reachable: 0 bytes in 0 blocks
==11804== suppressed: 0 bytes in 0 blocks
==11804==
==11804== For counts of detected and suppressed errors, rerun with: -v
==11804== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
==11802==
==11802== HEAP SUMMARY:
==11802== in use at exit: 0 bytes in 0 blocks
==11802== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==11802==
==11802== All heap blocks were freed -- no leaks are possible
==11802==
==11802== For counts of detected and suppressed errors, rerun with: -v
==11802== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
After it I rebuild coreutils from sources and retry my test. I got this report
log.
valgrind --tool=memcheck --leak-check=full --show-leak-kinds=all
--trace-children=yes /bin/bash -c "echo A | ./src/tail"
==18178== Memcheck, a memory error detector
==18178== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==18178== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==18178== Command: /bin/bash -c echo\ A\ |\ ./src/tail
==18178==
==18180== Memcheck, a memory error detector
==18180== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==18180== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==18180== Command: ./src/tail
==18180==
==18179==
==18179== HEAP SUMMARY:
==18179== in use at exit: 0 bytes in 0 blocks
==18179== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==18179==
==18179== All heap blocks were freed -- no leaks are possible
==18179==
==18179== For counts of detected and suppressed errors, rerun with: -v
==18179== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
A
==18180==
==18180== HEAP SUMMARY:
==18180== in use at exit: 96 bytes in 1 blocks
==18180== total heap usage: 99 allocs, 98 frees, 47,249 bytes allocated
==18180==
==18180== 96 bytes in 1 blocks are definitely lost in loss record 1 of 1
==18180== at 0x4C2DB8F: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18180== by 0x409738: xmalloc (xmalloc.c:41)
==18180== by 0x4022C8: xnmalloc (xalloc.h:108)
==18180== by 0x4022C8: main (tail.c:2301)
==18180==
==18180== LEAK SUMMARY:
==18180== definitely lost: 96 bytes in 1 blocks
==18180== indirectly lost: 0 bytes in 0 blocks
==18180== possibly lost: 0 bytes in 0 blocks
==18180== still reachable: 0 bytes in 0 blocks
==18180== suppressed: 0 bytes in 0 blocks
==18180==
==18180== For counts of detected and suppressed errors, rerun with: -v
==18180== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
==18178==
==18178== HEAP SUMMARY:
==18178== in use at exit: 0 bytes in 0 blocks
==18178== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==18178==
==18178== All heap blocks were freed -- no leaks are possible
==18178==
==18178== For counts of detected and suppressed errors, rerun with: -v
==18178== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
I checked the source code of tail.c and at line 2400 found this instruction
IF_LINT (free (F));
I found that this line not compiled by default. Use this make CFLAGS="-Dlint"
define I turned on this option and problem was resolved.
It's my final report after last recompile.
valgrind --tool=memcheck --leak-check=full --show-leak-kinds=all
--trace-children=yes /bin/bash -c "echo A | ./src/tail"
==25043== Memcheck, a memory error detector
==25043== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==25043== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==25043== Command: /bin/bash -c echo\ A\ |\ ./src/tail
==25043==
==25045== Memcheck, a memory error detector
==25045== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==25045== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==25045== Command: ./src/tail
==25045==
==25044==
==25044== HEAP SUMMARY:
==25044== in use at exit: 0 bytes in 0 blocks
==25044== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==25044==
==25044== All heap blocks were freed -- no leaks are possible
==25044==
==25044== For counts of detected and suppressed errors, rerun with: -v
==25044== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
A
==25045==
==25045== HEAP SUMMARY:
==25045== in use at exit: 0 bytes in 0 blocks
==25045== total heap usage: 99 allocs, 99 frees, 47,249 bytes allocated
==25045==
==25045== All heap blocks were freed -- no leaks are possible
==25045==
==25045== For counts of detected and suppressed errors, rerun with: -v
==25045== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==25043==
==25043== HEAP SUMMARY:
==25043== in use at exit: 0 bytes in 0 blocks
==25043== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==25043==
==25043== All heap blocks were freed -- no leaks are possible
==25043==
==25043== For counts of detected and suppressed errors, rerun with: -v
==25043== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
So this macros really help to resolve problem. Can anyone fix this
problem for package from distro?
** Affects: coreutils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1649296
Title:
tail memory leak
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