segfault when chunking

After ruinning mydump for 3 months without any problem i have suddenly started getting segfaults when chunking data. It happens on a random table each run.

backtrace is here, if you need more data i can compile with debug info

this is latest trunk (as of today) on rhel5 32bit linked against mysql 5.6.15 libs but it also happens with 0.5.8 linked against 5.6.14

mysql@devdb ~]$ gdb --args mydumper -t 1 -u root -o $MYDUMP_DIR -r 100000 -c --kill-long-queries
GNU gdb (GDB) CentOS (7.0.1-45.el5.centos)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /bin/mydumper...(no debugging symbols found)...done.
(gdb) r
Starting program: /bin/mydumper -t 1 -u root -o /home/mysql/backup/full -r 100000 -c --kill-long-queries
[Thread debugging using libthread_db enabled]
[New Thread 0xb7ff3b90 (LWP 24242)]
[Thread 0xb7ff3b90 (LWP 24242) exited]
[New Thread 0xb7ff3b90 (LWP 24243)]

Program received signal SIGSEGV, Segmentation fault.
0x009faf7b in ____strtoll_l_internal () from /lib/libc.so.6
(gdb) bt
#0 0x009faf7b in ____strtoll_l_internal () from /lib/libc.so.6
#1 0x009fa50f in __strtoq_internal@GLIBC_2.0 () from /lib/libc.so.6
#2 0x0804d2ee in get_chunks_for_table ()
#3 0x0804d9c8 in dump_table ()
#4 0x0804e17e in start_dump ()
#5 0x0804f20d in main ()
(gdb)