From bruen...@google.com on May 13, 2013 22:54:16

shows up like this on win8:
[ RUN ] OleTest.CoCreateInstance

Error #1: UNINITIALIZED READ: reading 0x01b0e3e4-0x01b0e3e8 4 byte(s) within 0x01b0e3cc-0x01b0e3e8
#0 system call NtSetInformationProcess parameter #2
#1 ntdll.dll!LdrpHandleTlsData (0x77d723b6 <ntdll.dll+0x123b6>) modid:25
#2 ntdll.dll!LdrpSnapModule (0x77dba153 <ntdll.dll+0x5a153>) modid:25
#3 ntdll.dll!LdrpMapAndSnapModules (0x77db9794 <ntdll.dll+0x59794>) modid:25
#4 ntdll.dll!LdrpPrepareModuleForExecution (0x77db9a9f <ntdll.dll+0x59a9f>) modid:25
#5 ntdll.dll!LdrpLoadDll (0x77dba247 <ntdll.dll+0x5a247>) modid:25
#6 ntdll.dll!LdrLoadDll (0x77db7229 <ntdll.dll+0x57229>) modid:25
#7 KERNELBASE.dll!LoadLibraryExW (0x77bfe7db <KERNELBASE.dll+0xe7db>) modid:24
#8 combase.dll!LoadLibraryWithLogging [d:\win8_gdr\com\combase\common\loadfree.cxx:160](0x75e67cb3 <combase.dll+0x27cb3) modid:18
#9 combase.dll!CClassCache::CDllPathEntry::LoadDll [d:\win8_gdr\com\combase\objact\dllcache.cxx:2398](0x75e67c05 <combase.dll+0x27c05) modid:18
#10 combase.dll!CClassCache::CDllPathEntry::Create [d:\win8_gdr\com\combase\objact\dllcache.cxx:2242](0x75e67a63 <combase.dll+0x27a63) modid:18
#11 combase.dll!CClassCache::CClassEntry::CreateDllClassEntry [d:\win8_gdr\com\combase\objact\dllcache.cxx:1035](0x75e67860 <combase.dll+0x27860) modid:18

app xsp=0x01b0e36c
arg 0 = 0xffffffff
arg 1 = 0x23
arg 2 = 0x1b0e3cc
arg 3 = 0x1c

      memarg iter pre param 2 parameter `#2` 0x1b0e3cc-0x1b0e3e8 r

memref: read @0x0000001a 0x01b0e3cc 0x1c bytes (pre-dword 0x00 0x00)

0x23 == 35 == ProcessTlsInformation

native clearly does not initialize the last dword (and clearly there's some var-len in this struct):
0:000> dds esp
01b0e360 ffffffff
01b0e364 00000023
01b0e368 01c78650 <Unloaded_>+0x1c1864e
01b0e36c 00000028
0:000> dd 01c78650
01c78650 00000000 00000001 00000002 00000000
01c78660 00000000 01c76018 baadf00d 00000000
01c78670 01c76058 baadf00d abababab abababab

and post-syscall it seems to be written to, along with earlier fields:

0:000> dd 01c78650
01c78650 00000000 00000001 00000002 00000000
01c78660 00000002 00000000 00000a44 00000002
01c78670 00000000 000005d8 abababab abababab

0:000> ~
. 0 Id: 374.a44 Suspend: 1 Teb: 7e41f000 Unfrozen
1 Id: 374.5d8 Suspend: 1 Teb: 7e41c000 Unfrozen

Original issue: http://code.google.com/p/drmemory/issues/detail?id=1228