[Bug libc/18662] New: __GI__IO_str_underflow in __tz_convert path

["anand.bhat at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18662

            Bug ID: 18662
           Summary: __GI__IO_str_underflow in __tz_convert path
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: anand.bhat at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

I hit the above issue after an overnight run. Software that I use uses
localtime_r to get timestamp for logging events. 
Code that is used is:
void get_time_tz(char *time_string)
{
    time_t t = time(0);
    struct tm *lt = NULL;
    struct tm lt1;


    t = time(&t);
    lt = localtime_r(&t, &lt1);
    strftime(time_string, TIMEFORMAT_LEN, "%Y-%m-%dT%H:%M:%S.%s%z", &lt1);

    return;
}


Stacktrace of the thread that caused underflow is as follows:#0
__GI__IO_str_underflow (fp=0x7f9d948bea40) at strops.c:169

#1 0x00007f9d971c92fe in __GI__IO_default_uflow (fp=0x7f9d948bea40)at
genops.c:435

#2 0x00007f9d971a95b8 in _IO_vfscanf_internal (s=s@entry=0x7f9d948bea40,
format=format@entry=0x7f9d972da8c9 "%hu%n:%hu%n:%hu%n",
argptr=argptr@entry=0x7f9d948beb68, errp=errp@entry=0x0) at vfscanf.c:1750

#3 0x00007f9d971be647 in _IO_vsscanf (string=0x116c5e4 "5:30",

format=0x7f9d972da8c9 "%hu%n:%hu%n:%hu%n", args=args@entry=0x7f9d948beb68)

at iovsscanf.c:44

#4 0x00007f9d971b8d77 in __sscanf (s=s@entry=0x116c5e4 "5:30",

format=format@entry=0x7f9d972da8c9 "%hu%n:%hu%n:%hu%n") at sscanf.c:32

#5 0x00007f9d97208688 in __tzset_parse_tz (tz=0x116c5e4 "5:30") at tzset.c:211

#6 0x00007f9d9720b02d in __tzfile_compute (timer=1436677916,

use_localtime=use_localtime@entry=1,

leap_correct=leap_correct@entry=0x7f9d948bed58,

leap_hit=leap_hit@entry=0x7f9d948bed54, tp=tp@entry=0x7f9d948bedb0)

at tzfile.c:673

#7 0x00007f9d97209a65 in __tz_convert (timer=0x7f9d948beda0, use_localtime=1,

tp=0x7f9d948bedb0) at tzset.c:635


This issue was seen after 10+ hours of run.

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