[Bug libc/13303] New: strange crash in 64bit vsnprintf()

["ninive at gmx dot at" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13303

             Bug #: 13303
           Summary: strange crash in 64bit vsnprintf()
           Product: glibc
           Version: 2.11
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: ninive@gmx.at
    Classification: Unclassified


Created attachment 5989
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5989
Testcase

vsnprintf() crashed on 64bit CentOS, but not on 32bit.

Backtrace (taken from CentOS 5):
#0 0x00000032a7479b60 in strlen () from /lib64/libc.so.6
0000001 0x00000032a7446cb9 in vfprintf () from /lib64/libc.so.6
0000002 0x00000032a74699da in vsnprintf () from /lib64/libc.so.6
#3 0x00000000006023cb in format (this=0x7fff315e9400, params=0xa22238 
#4 0x00000000009b3f86 in main (argc=1, argv=0x7fff315e9768)

Tested with
GNU libc: 2.5 (CentOS 5), 2.6.18-274.3.1.el5 x86_64 GNU/Linux
GNU libc: 2.11 (Ubuntu 10.04), 2.6.32-34-server x86_64 GNU/Linux

Steps to reproduce:
wget http://doppelbauer.name/vsnprintf.cpp
g++ -g -o vsnprintf vsnprintf.cpp
./vsnprintf

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