[Valgrind-users] RSS memory is increasing but memory leaks are not reported

[Jakub K. <jku...@gm...>]

Hello,

I have a  "strange" memory leak in my XML parser which I cannot locate
using valgrind.

In my testcase I'm creating and deleting a XML node and after the test
valgrind is not showing any memory leaks but rss memory is still
active  VmRSS: 11184 kB (  VmRSS after the  XML node creation was
11048 kB so it increased  by 136 after executing the XML node
destructor )

In the valigirng report I found "--30004--  memcheck: auxmaps: 179
auxmap entries (11456k, 11M) in use" which fits to the remaining 11048
kB in the RSS memory.What does this mean ?



==30004== Memcheck, a memory error detector.
==30004== Copyright (C) 2002-2006, and GNU GPL'd, by Julian Seward et al.
==30004== Using LibVEX rev 1658, a library for dynamic binary translation.
==30004== Copyright (C) 2004-2006, and GNU GPL'd, by OpenWorks LLP.
==30004== Using valgrind-3.2.1, a dynamic binary instrumentation framework.
==30004== Copyright (C) 2000-2006, and GNU GPL'd, by Julian Seward et al.
==30004==
==30004== My PID = 30004, parent PID = 27692.  Prog and args are:
==30004==    ./ala
==30004==
--30004--
--30004-- Command line
--30004--    ./ala
--30004-- Startup, with flags:
--30004--    --tool=memcheck
--30004--    --leak-check=full
--30004--    --leak-resolution=high
--30004--    --num-callers=40
--30004--    --show-reachable=yes
--30004--    --error-limit=no
--30004--    -v
--30004--    --log-file=valgrind.log
--30004-- Contents of /proc/version:
--30004--   Linux version 2.6.39.4-1.NSN.kiuas
(ro...@tr...) (gcc version 4.1.2 20080704 (Red Hat
4.1.2-46)) #1 SMP Wed Aug 10 12:16:36 EEST 2011
--30004-- Arch and hwcaps: AMD64, amd64-sse2
--30004-- Valgrind library directory: /usr/lib64/valgrind
--30004-- Reading syms from /home/kubinski/max/22/ala (0x400000)
--30004-- Reading syms from /usr/lib64/valgrind/amd64-linux/memcheck
(0x38000000)
--30004--    object doesn't have a dynamic symbol table
--30004-- Reading syms from /lib64/ld-2.5.so (0x3734000000)
--30004-- Reading suppressions file: /usr/lib64/valgrind/default.supp
--30004-- Reading syms from
/usr/lib64/valgrind/amd64-linux/vgpreload_core.so (0x4802000)
--30004-- Reading syms from
/usr/lib64/valgrind/amd64-linux/vgpreload_memcheck.so (0x4A03000)
--30004-- REDIR: 0x3734014400 (index) redirected to 0x4A06550 (index)
--30004-- REDIR: 0x37340145B0 (strcmp) redirected to 0x4A067D0 (strcmp)
--30004-- REDIR: 0x37340145E0 (strlen) redirected to 0x4A06700 (strlen)
--30004-- Reading syms from /usr/lib64/libstdc++.so.6.0.8 (0x3739400000)
--30004--    object doesn't have a symbol table
--30004-- Reading syms from /lib64/libm-2.5.so (0x3735800000)
--30004-- Reading syms from /lib64/libgcc_s-4.1.2-20080825.so.1 (0x3738C00000)
--30004--    object doesn't have a symbol table
--30004-- Reading syms from /lib64/libc-2.5.so (0x3735000000)
--30004-- REDIR: 0x3735079AB0 (rindex) redirected to 0x4A06400 (rindex)
--30004-- REDIR: 0x373507A970 (memset) redirected to 0x4A06920 (memset)
--30004-- REDIR: 0x37350796C0 (strlen) redirected to 0x4A066C0 (strlen)
--30004-- REDIR: 0x37394BD160 (operator new(unsigned long)) redirected
to 0x4A05F95 (operator new(unsigned long))
--30004-- REDIR: 0x373507BDB0 (memcpy) redirected to 0x4A06FF0 (memcpy)
==30004== Conditional jump or move depends on uninitialised value(s)
==30004==    at 0x373949B2BD: (within /usr/lib64/libstdc++.so.6.0.8)
==30004==    by 0x373949B585: std::string::find(char const*, unsigned
long, unsigned long) const (in /usr/lib64/libstdc++.so.6.0.8)
==30004==    by 0x402621:
libXML::CParser::changeCharsToEntitiesInCDATA() (in
/home/kubinski/max/22/ala)
==30004==    by 0x404259: libXML::CParser::parse(std::string&) (in
/home/kubinski/max/22/ala)
==30004==    by 0x4017E3: main (in /home/kubinski/max/22/ala)
--30004-- REDIR: 0x37394BBEF0 (operator delete(void*)) redirected to
0x4A050A9 (operator delete(void*))
--30004-- REDIR: 0x373507A1B0 (memchr) redirected to 0x4A06850 (memchr)
==30004==
==30004== Conditional jump or move depends on uninitialised value(s)
==30004==    at 0x404167: libXML::CParser::parse() (in
/home/kubinski/max/22/ala)
==30004==    by 0x404262: libXML::CParser::parse(std::string&) (in
/home/kubinski/max/22/ala)
==30004==    by 0x4017E3: main (in /home/kubinski/max/22/ala)
--30004-- REDIR: 0x37350726F0 (free) redirected to 0x4A05397 (free)
==30004==
==30004== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 4 from 1)
==30004==
==30004== 1 errors in context 1 of 2:
==30004== Conditional jump or move depends on uninitialised value(s)
==30004==    at 0x404167: libXML::CParser::parse() (in
/home/kubinski/max/22/ala)
==30004==    by 0x404262: libXML::CParser::parse(std::string&) (in
/home/kubinski/max/22/ala)
==30004==    by 0x4017E3: main (in /home/kubinski/max/22/ala)
==30004==
==30004== 1 errors in context 2 of 2:
==30004== Conditional jump or move depends on uninitialised value(s)
==30004==    at 0x373949B2BD: (within /usr/lib64/libstdc++.so.6.0.8)
--30004--
--30004-- supp:    4 Fedora-Core-6-hack3-ld25
==30004==
==30004== IN SUMMARY: 2 errors from 2 contexts (suppressed: 4 from 1)
==30004==
==30004== malloc/free: in use at exit: 0 bytes in 0 blocks.
==30004== malloc/free: 846,934 allocs, 846,934 frees, 25,055,370 bytes
allocated.
==30004==
==30004== All heap blocks were freed -- no leaks are possible.
--30004--  memcheck: sanity checks: 11546 cheap, 462 expensive
--30004--  memcheck: auxmaps: 179 auxmap entries (11456k, 11M) in use
--30004--  memcheck: auxmaps: 27975161 searches, 29272608 comparisons
--30004--  memcheck: SMs: n_issued      = 481 (7696k, 7M)
--30004--  memcheck: SMs: n_deissued    = 18 (288k, 0M)
--30004--  memcheck: SMs: max_noaccess  = 524287 (8388592k, 8191M)
--30004--  memcheck: SMs: max_undefined = 9 (144k, 0M)
--30004--  memcheck: SMs: max_defined   = 249 (3984k, 3M)
--30004--  memcheck: SMs: max_non_DSM   = 481 (7696k, 7M)
--30004--  memcheck: max sec V bit nodes:    0 (0k, 0M)
--30004--  memcheck: set_sec_vbits8 calls: 0 (new: 0, updates: 0)
--30004--  memcheck: max shadow mem size:   11840k, 11M
--30004-- translate:            fast SP updates identified: 3,741 ( 87.8%)
--30004-- translate:   generic_known SP updates identified: 307 (  7.2%)
--30004-- translate: generic_unknown SP updates identified: 209 (  4.9%)
--30004--     tt/tc: 117,211 tt lookups requiring 186,235 probes
--30004--     tt/tc: 117,211 fast-cache updates, 5 flushes
--30004--  transtab: new        3,358 (81,817 -> 1,555,815; ratio
190:10) [0 scs]
--30004--  transtab: dumped     0 (0 -> ??)
--30004--  transtab: discarded  12 (257 -> ??)
--30004-- scheduler: 1,154,615,962 jumps (bb entries).
--30004-- scheduler: 11,546/1,819,427 major/minor sched events.
--30004--    sanity: 11547 cheap, 462 expensive checks.
--30004--    exectx: 30,011 lists, 170 contexts (avg 0 per list)
--30004--    exectx: 1,693,874 searches, 21,706,760 full compares
(12,814 per 1000)
--30004--    exectx: 0 cmp2, 15 cmp4, 0 cmpAll



proc status without the valgrind after the XML creation
Name:	ala
State:	S (sleeping)
Tgid:	889
Pid:	889
PPid:	27692
TracerPid:	0
Uid:	61368538	61368538	61368538	61368538
Gid:	300	300	300	300
FDSize:	256
Groups:	300 2051
VmPeak:	   21724 kB
VmSize:	   21724 kB
VmLck:	       0 kB
VmHWM:	   11048 kB
VmRSS:	   11048 kB
VmData:	    9700 kB
VmStk:	     136 kB
VmExe:	     688 kB
VmLib:	    2936 kB
VmPTE:	      76 kB
VmSwap:	       0 kB
Threads:	1
SigQ:	0/1033564
SigPnd:	0000000000000000
ShdPnd:	0000000000000000
SigBlk:	0000000000000000
SigIgn:	0000000000000000
SigCgt:	0000000000000000
CapInh:	0000000000000000
CapPrm:	0000000000000000
CapEff:	0000000000000000
CapBnd:	ffffffffffffffff
Cpus_allowed:	ffffffff
Cpus_allowed_list:	0-31
voluntary_ctxt_switches:	13
nonvoluntary_ctxt_switches:	2

proc status without the valgrind after deleting the XML node:
Name:	ala
State:	S (sleeping)
Tgid:	889
Pid:	889
PPid:	27692
TracerPid:	0
Uid:	61368538	61368538	61368538	61368538
Gid:	300	300	300	300
FDSize:	256
Groups:	300 2051
VmPeak:	   21724 kB
VmSize:	   21724 kB
VmLck:	       0 kB
VmHWM:	   11184 kB
VmRSS:	   11184 kB
VmData:	    9700 kB
VmStk:	     136 kB
VmExe:	     688 kB
VmLib:	    2936 kB
VmPTE:	      76 kB
VmSwap:	       0 kB
Threads:	1
SigQ:	0/1033564
SigPnd:	0000000000000000
ShdPnd:	0000000000000000
SigBlk:	0000000000000000
SigIgn:	0000000000000000
SigCgt:	0000000000000000
CapInh:	0000000000000000
CapPrm:	0000000000000000
CapEff:	0000000000000000
CapBnd:	ffffffffffffffff
Cpus_allowed:	ffffffff
Cpus_allowed_list:	0-31
voluntary_ctxt_switches:	14
nonvoluntary_ctxt_switches:	4

Br,
Jakub