Found with valgrind in glibc 2.3.5, but on the internet it is also
reported for
glibc 2.4. After a pthread_create and pthread_join valgrind reports a
memory
leak. I could not find a definite answer, if this is an error or not. The
number
of reported leaks grows in server applications, where with each request a
new
handler thread is created.
Valgrind output:
==5599== Memcheck, a memory error detector.
==5599== Copyright (C) 2002-2006, and GNU GPL'd, by Julian Seward et al.
==5599== Using LibVEX rev 1606, a library for dynamic binary translation.
==5599== Copyright (C) 2004-2006, and GNU GPL'd, by OpenWorks LLP.
==5599== Using valgrind-3.2.0, a dynamic binary instrumentation framework.
==5599== Copyright (C) 2000-2006, and GNU GPL'd, by Julian Seward et al.
==5599== For more details, rerun with: -v
==5599==
==5599==
==5599== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 15 from 1)
==5599== malloc/free: in use at exit: 68 bytes in 1 blocks.
==5599== malloc/free: 1 allocs, 0 frees, 68 bytes allocated.
==5599== For counts of detected errors, rerun with: -v
==5599== searching for pointers to 1 not-freed blocks.
==5599== checked 2,171,312 bytes.
==5599==
==5599== 68 bytes in 1 blocks are possibly lost in loss record 1 of 1
==5599== at 0x401C894: calloc (vg_replace_malloc.c:279)
==5599== by 0x400DCC8: allocate_dtv (in /lib/ld-2.3.5.so)
==5599== by 0x400DF3B: _dl_allocate_tls (in /lib/ld-2.3.5.so)
==5599== by 0x40388E4: pthread_create@@GLIBC_2.1 (in
/lib/tls/libpthread-2.3.5.so)
==5599== by 0x804849F: main (in /home/holle/src/a.out)
==5599==
==5599== LEAK SUMMARY:
==5599== definitely lost: 0 bytes in 0 blocks.
==5599== possibly lost: 68 bytes in 1 blocks.
==5599== still reachable: 0 bytes in 0 blocks.
==5599== suppressed: 0 bytes in 0 blocks.
Test program compiled under Linux SuSE 10.0 with
gcc test.c -lpthread
valgrind --tool=memcheck --leak-check=yes --num-callers=12
--freelist-vol=100000000 --show-reachable=yes ./a.out
Test program:
#include <pthread.h>
static void *func(void *param)
{
return NULL;
}
int main(int argc, char **argv)
{
pthread_t handle;
pthread_create(&handle, NULL, func, NULL);
pthread_join(handle, NULL);
return 0;
}
--
Summary: Memory leak in allocate_dtv (in /lib/ld-2.3.5.so), SuSE
Linux 10.0
Product: glibc
Version: 2.4
Status: NEW
Severity: normal
Priority: P1
Component: libc
AssignedTo: drepper at redhat dot com
ReportedBy: chollstein at teracortex dot com
CC: glibc-bugs at sources dot redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=3087
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