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From: "vikasyadav.net91 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug time/29705] New: libc timer_create with option SIGEV_THREAD system call having memory leaks after timer_delete system call
Date: Thu, 20 Oct 2022 05:10:49 +0000 [thread overview]
Message-ID: <bug-29705-131@http.sourceware.org/bugzilla/> (raw)
https://sourceware.org/bugzilla/show_bug.cgi?id=29705
Bug ID: 29705
Summary: libc timer_create with option SIGEV_THREAD system call
having memory leaks after timer_delete system call
Product: glibc
Version: 2.31
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: time
Assignee: unassigned at sourceware dot org
Reporter: vikasyadav.net91 at gmail dot com
Target Milestone: ---
Created attachment 14406
--> https://sourceware.org/bugzilla/attachment.cgi?id=14406&action=edit
Timer application
I have following ubuntu environment:
Description: Ubuntu 20.04.1 LTS
Release: 20.04
gcc 9.4.0
Linux version 5.15.0-48-generic
libc-2.31.so
I am using libc timer_create system call with option SIGEV_THREAD to create a
timer, My timer functionality is working fine but when I exit my code after
successfully deletion of timer using timer_delete system call I am getting 272
bytes of memory leak in valgrind report.
I have attached my sample application(timer_app.c). Please review and let me
know if I am doing anything wrong here.
below is the valgrind memory leak snippet
==682959== 272 bytes in 1 blocks are possibly lost in loss record 1 of 1
==682959== at 0x483DD99: calloc (in
/usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==682959== by 0x40149DA: allocate_dtv (dl-tls.c:286)
==682959== by 0x40149DA: _dl_allocate_tls (dl-tls.c:532)
==682959== by 0x4A65322: allocate_stack (allocatestack.c:622)
==682959== by 0x4A65322: pthread_create@@GLIBC_2.2.5 (pthread_create.c:660)
==682959== by 0x4865BCC: __start_helper_thread (timer_routines.c:176)
==682959== by 0x4A6D4DE: __pthread_once_slow (pthread_once.c:116)
==682959== by 0x48649A2: timer_create@@GLIBC_2.3.3 (timer_create.c:101)
==682959== by 0x1092F1: SupTimerInit (in /home/vikas/a.out)
==682959== by 0x109490: main (in /home/vikas/a.out)
=======================================================================
complete valgrind dump
==682959== Memcheck, a memory error detector
==682959== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==682959== Using Valgrind-3.15.0-608cb11914-20190413 and LibVEX; rerun with -h
for copyright info
==682959== Command: ./a.out
==682959== Parent PID: 681415
==682959==
--682959--
--682959-- Valgrind options:
--682959-- --leak-check=full
--682959-- --show-leak-kinds=all
--682959-- --track-origins=yes
--682959-- --verbose
--682959-- --log-file=valgrind-out.txt
--682959-- Contents of /proc/version:
--682959-- Linux version 5.15.0-48-generic (buildd@lcy02-amd64-043) (gcc
(Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34)
#54~20.04.1-Ubuntu SMP Thu Sep 1 16:17:26 UTC 2022
--682959--
--682959-- Arch and hwcaps: AMD64, LittleEndian,
amd64-cx16-lzcnt-rdtscp-sse3-ssse3-avx-avx2-bmi-f16c-rdrand
--682959-- Page sizes: currently 4096, max supported 4096
--682959-- Valgrind library directory: /usr/lib/x86_64-linux-gnu/valgrind
--682959-- Reading syms from /home/vikas/a.out
--682959-- Reading syms from /usr/lib/x86_64-linux-gnu/ld-2.31.so
--682959-- Considering
/usr/lib/debug/.build-id/45/87364908de169dec62ffa538170118c1c3a078.debug ..
--682959-- .. build-id is valid
--682959-- Reading syms from
/usr/lib/x86_64-linux-gnu/valgrind/memcheck-amd64-linux
--682959-- object doesn't have a symbol table
--682959-- object doesn't have a dynamic symbol table
--682959-- Scheduler: using generic scheduler lock implementation.
--682959-- Reading suppressions file:
/usr/lib/x86_64-linux-gnu/valgrind/default.supp
==682959== embedded gdbserver: reading from
/tmp/vgdb-pipe-from-vgdb-to-682959-by-vikas-on-???
==682959== embedded gdbserver: writing to
/tmp/vgdb-pipe-to-vgdb-from-682959-by-vikas-on-???
==682959== embedded gdbserver: shared mem
/tmp/vgdb-pipe-shared-mem-vgdb-682959-by-vikas-on-???
==682959==
==682959== TO CONTROL THIS PROCESS USING vgdb (which you probably
==682959== don't want to do, unless you know exactly what you're doing,
==682959== or are doing some strange experiment):
==682959== /usr/lib/x86_64-linux-gnu/valgrind/../../bin/vgdb --pid=682959
...command...
==682959==
==682959== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==682959== /path/to/gdb ./a.out
==682959== and then give GDB the following command
==682959== target remote | /usr/lib/x86_64-linux-gnu/valgrind/../../bin/vgdb
--pid=682959
==682959== --pid is optional if only one valgrind process is running
==682959==
--682959-- REDIR: 0x4022e20 (ld-linux-x86-64.so.2:strlen) redirected to
0x580c9ce2 (???)
--682959-- REDIR: 0x4022bf0 (ld-linux-x86-64.so.2:index) redirected to
0x580c9cfc (???)
--682959-- Reading syms from
/usr/lib/x86_64-linux-gnu/valgrind/vgpreload_core-amd64-linux.so
--682959-- object doesn't have a symbol table
--682959-- Reading syms from
/usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so
--682959-- object doesn't have a symbol table
==682959== WARNING: new redirection conflicts with existing -- ignoring it
--682959-- old: 0x04022e20 (strlen ) R-> (0000.0) 0x580c9ce2
???
--682959-- new: 0x04022e20 (strlen ) R-> (2007.0) 0x0483f060
strlen
--682959-- REDIR: 0x401f600 (ld-linux-x86-64.so.2:strcmp) redirected to
0x483ffd0 (strcmp)
--682959-- REDIR: 0x4023380 (ld-linux-x86-64.so.2:mempcpy) redirected to
0x4843a20 (mempcpy)
--682959-- Reading syms from /usr/lib/x86_64-linux-gnu/librt-2.31.so
--682959-- Considering
/usr/lib/debug/.build-id/ce/016c975d94bc4770ed8c62d45dea6b71405a2c.debug ..
--682959-- .. build-id is valid
--682959-- Reading syms from /usr/lib/x86_64-linux-gnu/libc-2.31.so
--682959-- Considering
/usr/lib/debug/.build-id/18/78e6b475720c7c51969e69ab2d276fae6d1dee.debug ..
--682959-- .. build-id is valid
--682959-- Reading syms from /usr/lib/x86_64-linux-gnu/libpthread-2.31.so
--682959-- Considering
/usr/lib/debug/.build-id/7b/4536f41cdaa5888408e82d0836e33dcf436466.debug ..
--682959-- .. build-id is valid
--682959-- REDIR: 0x490a480 (libc.so.6:memmove) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909780 (libc.so.6:strncpy) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a7b0 (libc.so.6:strcasecmp) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x49090a0 (libc.so.6:strcat) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x49097e0 (libc.so.6:rindex) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490bc50 (libc.so.6:rawmemchr) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4926ce0 (libc.so.6:wmemchr) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4926820 (libc.so.6:wcscmp) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a5e0 (libc.so.6:mempcpy) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a410 (libc.so.6:bcmp) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909710 (libc.so.6:strncmp) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909150 (libc.so.6:strcmp) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a540 (libc.so.6:memset) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x49267e0 (libc.so.6:wcschr) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909670 (libc.so.6:strnlen) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909230 (libc.so.6:strcspn) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a800 (libc.so.6:strncasecmp) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x49091d0 (libc.so.6:strcpy) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a950 (libc.so.6:memcpy@@GLIBC_2.14) redirected to
0x48331d0 (_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4927f50 (libc.so.6:wcsnlen) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4926860 (libc.so.6:wcscpy) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909820 (libc.so.6:strpbrk) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909100 (libc.so.6:index) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909630 (libc.so.6:strlen) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4912bb0 (libc.so.6:memrchr) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a850 (libc.so.6:strcasecmp_l) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a3d0 (libc.so.6:memchr) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4926930 (libc.so.6:wcslen) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x4909ae0 (libc.so.6:strspn) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a750 (libc.so.6:stpncpy) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a6f0 (libc.so.6:stpcpy) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490bc90 (libc.so.6:strchrnul) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x490a8a0 (libc.so.6:strncasecmp_l) redirected to 0x48331d0
(_vgnU_ifunc_wrapper)
--682959-- REDIR: 0x49f2500 (libc.so.6:__strrchr_avx2) redirected to 0x483ea10
(rindex)
--682959-- REDIR: 0x4905b10 (libc.so.6:calloc) redirected to 0x483dce0 (calloc)
--682959-- REDIR: 0x49046d0 (libc.so.6:free) redirected to 0x483c9d0 (free)
--682959-- REDIR: 0x49040e0 (libc.so.6:malloc) redirected to 0x483b780 (malloc)
--682959-- REDIR: 0x49f2310 (libc.so.6:__strchrnul_avx2) redirected to
0x4843540 (strchrnul)
--682959-- REDIR: 0x49f56c0 (libc.so.6:__mempcpy_avx_unaligned_erms) redirected
to 0x4843660 (mempcpy)
--682959-- REDIR: 0x49f5b60 (libc.so.6:__memset_avx2_unaligned_erms) redirected
to 0x48428e0 (memset)
==682959==
==682959== HEAP SUMMARY:
==682959== in use at exit: 272 bytes in 1 blocks
==682959== total heap usage: 6 allocs, 5 frees, 1,688 bytes allocated
==682959==
==682959== Searching for pointers to 1 not-freed blocks
==682959== Checked 116,416 bytes
==682959==
==682959== 272 bytes in 1 blocks are possibly lost in loss record 1 of 1
==682959== at 0x483DD99: calloc (in
/usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==682959== by 0x40149DA: allocate_dtv (dl-tls.c:286)
==682959== by 0x40149DA: _dl_allocate_tls (dl-tls.c:532)
==682959== by 0x4A65322: allocate_stack (allocatestack.c:622)
==682959== by 0x4A65322: pthread_create@@GLIBC_2.2.5 (pthread_create.c:660)
==682959== by 0x4865BCC: __start_helper_thread (timer_routines.c:176)
==682959== by 0x4A6D4DE: __pthread_once_slow (pthread_once.c:116)
==682959== by 0x48649A2: timer_create@@GLIBC_2.3.3 (timer_create.c:101)
==682959== by 0x1092F1: SupTimerInit (in /home/vikas/a.out)
==682959== by 0x109490: main (in /home/vikas/a.out)
==682959==
==682959== LEAK SUMMARY:
==682959== definitely lost: 0 bytes in 0 blocks
==682959== indirectly lost: 0 bytes in 0 blocks
==682959== possibly lost: 272 bytes in 1 blocks
==682959== still reachable: 0 bytes in 0 blocks
==682959== suppressed: 0 bytes in 0 blocks
==682959==
==682959== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Regards,
Vikas
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next reply other threads:[~2022-10-20 5:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-20 5:10 vikasyadav.net91 at gmail dot com [this message]
2022-10-20 16:45 ` [Bug time/29705] " adhemerval.zanella at linaro dot org
2022-10-21 4:20 ` vikasyadav.net91 at gmail dot com
2022-10-21 8:54 ` fweimer at redhat dot com
2022-11-12 9:25 ` pandom79 at gmail dot com
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