[indiana-discuss] [perf-discuss] Memory leak somewhere, maybe in libc (libc_hwcap2.so.1 / SXCE b105 x64) ?

[Bart Smaalders]

Martin Bochnig wrote:
> 
> Both my version of wget shall have a bug and my version of top?
> Seriously, how likely is this?
> Isn't it more likely that there is a problem in a shared library that
> both happen to use?

If this is reproducible, could you employ libumem to get an idea of
where the leaks are occuring?

% export UMEM_DEBUG=default
% LD_PRELOAD=libumem.so.1 wget  .....


after a while, use gcore $WGETPID to generate a core from another
window.  Attach mdb and run ::findleaks:

: barts at cyber[9]; mdb /usr/bin/wget core.19356
Loading modules: [ libumem.so.1 ld.so.1 ]
 > ::findleaks
CACHE     LEAKED   BUFCTL CALLER
080b1510       6 080f1218 checking_malloc+0x11
080a9290       1 080c6930 libc_hwcap2.so.1`strdup+0x26
080a9290       1 080c69a8 libc_hwcap2.so.1`strdup+0x26
------------------------------------------------------------------------
    Total       8 buffers, 3872 bytes
 >

If no leaks are found, allocated memory is still reachable
so use ::umausers to find out the pigs:


 > ::umausers
101520 bytes for 1269 allocations with data size 80:
          libumem.so.1`umem_cache_alloc_debug+0x144
          libumem.so.1`umem_cache_alloc+0x19a
          libumem.so.1`umem_alloc+0xcd
          libumem.so.1`malloc+0x2a
          libc_hwcap2.so.1`strdup+0x26
          checking_strdup+0xf
          string_set_add+0x23
          retrieve_tree+0x37f
          main+0x5ed
          _start+0x7d
100880 bytes for 1261 allocations with data size 80:
          libumem.so.1`umem_cache_alloc_debug+0x144
          libumem.so.1`umem_cache_alloc+0x19a
          libumem.so.1`umem_alloc+0xcd
          libumem.so.1`malloc+0x2a
          libc_hwcap2.so.1`strdup+0x26
          checking_strdup+0xf
          retrieve_tree+0x343
          main+0x5ed
          _start+0x7d

  ...

- Bart





-- 
Bart Smaalders			Solaris Kernel Performance
barts at cyber.eng.sun.com		http://blogs.sun.com/barts
"You will contribute more with mercurial than with thunderbird."