ImageMagick segfault

GNU gdb (Gentoo 7.2 p1) 7.2
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-pc-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.gentoo.org/>...
Reading symbols from /usr/local/bin/convert...done.
[?1034h(gdb) run
Starting program: /usr/local/bin/convert book1.djvu /var/1/page-%d.png
[Thread debugging using libthread_db enabled]
[New Thread 0xb6928b70 (LWP 13308)]
[Thread 0xb6928b70 (LWP 13308) exited]
[New Thread 0xb5fffb70 (LWP 13309)]
[Thread 0xb5fffb70 (LWP 13309) exited]
[New Thread 0xb5fffb70 (LWP 13310)]
[New Thread 0xb6928b70 (LWP 13311)]
[Thread 0xb6928b70 (LWP 13311) exited]
[Thread 0xb5fffb70 (LWP 13310) exited]
[New Thread 0xb5fffb70 (LWP 13312)]
[New Thread 0xb6928b70 (LWP 13313)]
[Thread 0xb6928b70 (LWP 13313) exited]
[Thread 0xb5fffb70 (LWP 13312) exited]
[New Thread 0xb5fffb70 (LWP 13314)]
[New Thread 0xb6928b70 (LWP 13315)]
[Thread 0xb6928b70 (LWP 13315) exited]
[Thread 0xb5fffb70 (LWP 13314) exited]
[New Thread 0xb5fffb70 (LWP 13316)]
[New Thread 0xb6928b70 (LWP 13318)]
[Thread 0xb6928b70 (LWP 13318) exited]
[Thread 0xb5fffb70 (LWP 13316) exited]
[New Thread 0xb5fffb70 (LWP 13320)]
[New Thread 0xb6928b70 (LWP 13321)]
[Thread 0xb6928b70 (LWP 13321) exited]
[Thread 0xb5fffb70 (LWP 13320) exited]
[New Thread 0xb5fffb70 (LWP 13322)]
[New Thread 0xb6928b70 (LWP 13323)]
[Thread 0xb6928b70 (LWP 13323) exited]
[Thread 0xb5fffb70 (LWP 13322) exited]
[New Thread 0xb5fffb70 (LWP 13324)]
[New Thread 0xb6928b70 (LWP 13325)]
[Thread 0xb6928b70 (LWP 13325) exited]
[Thread 0xb5fffb70 (LWP 13324) exited]
[New Thread 0xb5fffb70 (LWP 13326)]
[New Thread 0xb6928b70 (LWP 13327)]
[Thread 0xb6928b70 (LWP 13327) exited]
[Thread 0xb5fffb70 (LWP 13326) exited]
[New Thread 0xb5fffb70 (LWP 13328)]
[New Thread 0xb6928b70 (LWP 13329)]
[Thread 0xb6928b70 (LWP 13329) exited]
[Thread 0xb5fffb70 (LWP 13328) exited]
[New Thread 0xb5fffb70 (LWP 13330)]
[New Thread 0xb6928b70 (LWP 13331)]
[Thread 0xb6928b70 (LWP 13331) exited]
[Thread 0xb5fffb70 (LWP 13330) exited]
[New Thread 0xb5fffb70 (LWP 13334)]
[New Thread 0xb6928b70 (LWP 13336)]
[Thread 0xb6928b70 (LWP 13336) exited]
[Thread 0xb5fffb70 (LWP 13334) exited]
[New Thread 0xb5fffb70 (LWP 13340)]
[New Thread 0xb6928b70 (LWP 13341)]
[Thread 0xb6928b70 (LWP 13341) exited]
[Thread 0xb5fffb70 (LWP 13340) exited]

Program received signal SIGSEGV, Segmentation fault.
QueueAuthenticNexus (image=0x8070ea0, x=0, y=0, columns=4060, rows=1, nexus_info=0xb582da40,
    exception=0x8074068) at magick/cache.c:4405
4405      assert(cache_info->signature == MagickSignature);

(gdb)