Comment 2 for bug 2063110

(gdb) bt
#0 __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2 __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3 0x00007ffff764526e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4 0x00007ffff76288ff in __GI_abort () at ./stdlib/abort.c:79
#5 0x00007ffff76297b6 in __libc_message_impl (fmt=fmt@entry=0x7ffff77ce765 "*** %s ***: terminated\n") at ../sysdeps/posix/libc_fatal.c:132
#6 0x00007ffff7736c19 in __GI___fortify_fail (msg=msg@entry=0x7ffff77ce74c "buffer overflow detected") at ./debug/fortify_fail.c:24
#7 0x00007ffff77365d4 in __GI___chk_fail () at ./debug/chk_fail.c:28
#8 0x00007ffff7737db5 in ___snprintf_chk (s=<optimized out>, maxlen=maxlen@entry=255, flag=flag@entry=2, slen=<optimized out>, format=format@entry=0x555555646372 ":+%i\n")
    at ./debug/snprintf_chk.c:29
#9 0x00005555555cbce1 in snprintf (__fmt=<optimized out>, __n=<optimized out>, __s=<optimized out>, __s=<optimized out>, __n=<optimized out>, __fmt=<optimized out>)
    at /usr/include/x86_64-linux-gnu/bits/stdio2.h:54
#10 utils::Lockfile::try_lock (this=0x5555556dbd40) at utils/lockfile.cc:101
#11 core::DownloadStore::enable (lock=<optimized out>, this=0x5555556dbd20) at core/download_store.cc:74
#12 Control::initialize (this=0x5555556d7480) at /usr/src/rtorrent-0.9.8-1build3/src/control.cc:115
#13 0x00005555555947af in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/rtorrent-0.9.8-1build3/src/main.cc:469