I've similar issue with libCurl.
In my case application is being instrumented (with Rational/IBM tool)
W/o instrumenting it works fine. Below is backtrace info:

curl_mvsnprintf+0x25
curl_msnprintf+0x86
?
curl_version_info+0x15
curlTransaction_create+0x757
...

Version used is 7.36

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** [bugs:#1383] Segmentation fault in dprintf_formatf: Lot of the curl tests are crashing with SIGSEGV.**
**Status:** open
**Created:** Wed Jun 25, 2014 07:36 AM UTC by VVPrasad
**Last Updated:** Sun Jun 29, 2014 02:21 AM UTC
**Owner:** Daniel Stenberg
Segmentation fault in dprintf_formatf: Lot of the curl tests are crashing with SIGSEGV.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 4156541232 (LWP 13301)]
0xf7d4f722 in dprintf_formatf (data=0xf7d19580, stream=0xf7c59300 <fputc>, format=0xf7d80504 "\r%3ld %s  %3ld %s  %3ld %s  %s  %s %s %s %s %s",
    ap_save=0xff9be1c8 "d") at mprintf.c:808
808     mprintf.c: No such file or directory.
        in mprintf.c
Please have a look at the stack back trace attached for more details.
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