From timurrrr@google.com on June 10, 2011 11:48:18

Happens on Chromium media_unittests http://build.chromium.org/p/chromium.fyi/builders/Windows%20Tests%20%28DrMemory%29/builds/4125/steps/memory%20test%3A%20media/logs/stdio Repro:

#include <windows.h>
#include <mmsystem.h>

#pragma comment(lib, "winmm.lib")

#include <stdio.h>

int main() {
printf("Audio devices are %spresent\n", (::waveOutGetNumDevs() != 0) ? "" : "not ");
return 0;
}

w/o symbols they look like this:
Error #1: UNINITIALIZED READ: reading register eax
@0:00:04.387 in thread 1732
0x76b464d2 <WINMM.dll+0x64d2> WINMM.dll!waveOutMessage
0x76b463de <WINMM.dll+0x63de> WINMM.dll!waveOutMessage
0x76b46487 <WINMM.dll+0x6487> WINMM.dll!waveOutMessage
0x76b45fbb <WINMM.dll+0x5fbb> WINMM.dll!waveOutGetNumDevs
0x0040132d <test.exe+0x132d> test.exe!main
test.cpp:9
...

...
Error #87: LEAK 228 direct bytes 0x00157928-0x00157a0c + 32 indirect bytes
0x77e781f9 <RPCRT4.dll+0x81f9> RPCRT4.dll!I_RpcBCacheFree
0x77e781d0 <RPCRT4.dll+0x81d0> RPCRT4.dll!I_RpcBCacheFree
0x77e87685 <RPCRT4.dll+0x17685> RPCRT4.dll!I_RpcBindingIsClientLocal
0x77e87651 <RPCRT4.dll+0x17651> RPCRT4.dll!I_RpcBindingIsClientLocal
0x77e7e959 <RPCRT4.dll+0xe959> RPCRT4.dll!RpcBindingFromStringBindingW
0x76b46a1c <WINMM.dll+0x6a1c> WINMM.dll!waveOutMessage
0x76b46835 <WINMM.dll+0x6835> WINMM.dll!waveOutMessage
0x76b45fbb <WINMM.dll+0x5fbb> WINMM.dll!waveOutGetNumDevs
0x0040132d <test.exe+0x132d> test.exe!main
test.cpp:9

With symbols they look like this:
Error #1: UNINITIALIZED READ: reading register eax
@0:00:02.451 in thread 1528
0x76b464d2 <WINMM.dll+0x64d2> WINMM.dll!winmmGetPnpInfo
0x76b463de <WINMM.dll+0x63de> WINMM.dll!ClientPnpChange
0x76b46487 <WINMM.dll+0x6487> WINMM.dll!ClientUpdatePnpInfo
0x76b45fbb <WINMM.dll+0x5fbb> WINMM.dll!waveOutGetNumDevs
0x0040132d <test.exe+0x132d> test.exe!main
test.cpp:9
...

...
Error #92: LEAK 228 direct bytes 0x00157920-0x00157a04 + 32 indirect bytes
0x77e781f9 <RPCRT4.dll+0x81f9> RPCRT4.dll!AllocWrapper
0x77e781d0 <RPCRT4.dll+0x81d0> RPCRT4.dll!operator new
0x77e87685 <RPCRT4.dll+0x17685> RPCRT4.dll!LrpcCreateBindingHandle
0x77e87651 <RPCRT4.dll+0x17651> RPCRT4.dll!DCE_BINDING::CreateBindingHandle
0x77e7e959 <RPCRT4.dll+0xe959> RPCRT4.dll!RpcBindingFromStringBindingW
0x76b46a1c <WINMM.dll+0x6a1c> WINMM.dll!AudioSrvBinding
0x76b46835 <WINMM.dll+0x6835> WINMM.dll!ClientUpdatePnpInfo
0x76b45fbb <WINMM.dll+0x5fbb> WINMM.dll!waveOutGetNumDevs
0x0040132d <test.exe+0x132d> test.exe!main
test.cpp:9

Original issue: http://code.google.com/p/drmemory/issues/detail?id=454