From timurrrr@google.com on September 29, 2010 09:44:53

As of r57 ,
===test.c===
#include <stdio.h>

int main(void) {
printf("%5.2f\n", 123456.789);
return 0;
}

Gives reports like these:
Error #6: UNINITIALIZED READ: reading 0x0012fa06-0x0012fa08 2 byte(s) within 0x0012fa06-0x0012fa0a
@0:00:01.890 in thread 2404
0x0042fba1 <test.exe+0x2fba1> test.exe!__ld12mul
??:0
0x0042f85f <test.exe+0x2f85f> test.exe!__multtenpow12
??:0
0x004300b1 <test.exe+0x300b1> test.exe!$I10_OUTPUT
??:0
0x0041aa25 <test.exe+0x1aa25> test.exe!_fltout2
??:0
0x004057ac <test.exe+0x57ac> test.exe!_cftof_l
??:0
0x00405e5b <test.exe+0x5e5b> test.exe!_cfltcvt_l
??:0
0x0040280a <test.exe+0x280a> test.exe!_output_l
f:\dd\vctools\crt_bld\self_x86\crt\src\output.c:1828
0x00401120 <test.exe+0x1120> test.exe!printf
f:\dd\vctools\crt_bld\self_x86\crt\src\printf.c:63
0x00401029 <test.exe+0x1029> test.exe!main
z:\dr-sandbox\issues\timers\test.c:4
...

Original issue: http://code.google.com/p/drmemory/issues/detail?id=58