Mine

file: 'torrent_info.cpp'
line: 828
function: int libtorrent::torrent_info::piece_size(int) const
expression: size <= piece_length()
stack:
0: /usr/lib/libtorrent-0.13.so(_Z11assert_failPKciS0_S0_+0x61) [0xb789442d]
1: /usr/lib/libtorrent-0.13.so(_ZNK10libtorrent12torrent_info10piece_sizeEi+0x172) [0xb79ed0d4]
2: /usr/lib/libtorrent-0.13.so(_ZNK10libtorrent7torrent20quantized_bytes_doneEv+0x14b) [0xb79954cd]
3: /usr/lib/libtorrent-0.13.so(_ZNK10libtorrent7torrent15check_invariantEv+0x8f1) [0xb7996f01]
4: /usr/lib/libtorrent-0.13.so(_ZN10libtorrent16invariant_access15check_invariantINS_7torrentEEEvRKT_+0x1d) [0xb79ce4f9]
5: /usr/lib/libtorrent-0.13.so(_ZN10libtorrent15check_invariantINS_7torrentEEEvRKT_+0x1d) [0xb79ce51d]
6: /usr/lib/libtorrent-0.13.so(_ZN10libtorrent22invariant_checker_implINS_7torrentEED1Ev+0x20) [0xb79ce60a]
7: /usr/lib/libtorrent-0.13.so(_ZN10libtorrent7torrent16check_fastresumeERNS_3aux18piece_checker_dataE+0x51b) [0xb799abaf]
8: /usr/lib/libtorrent-0.13.so(_ZN10libtorrent3aux12checker_implclEv+0x95a) [0xb794d248]
9: /usr/lib/libtorrent-0.13.so(_ZN5boost6detail8function26void_function_ref_invoker0IN10libtorrent3aux12checker_implEvE6invokeERNS1_15function_bufferE+0x25) [0xb797c805]
10: /usr/lib/libtorrent-0.13.so(_ZNK5boost9function0IvSaINS_13function_baseEEEclEv+0x77) [0xb7ace321]
11: /usr/lib/libboost_thread-gcc42-mt-1_34_1.so.1.34.1 [0xb6707c27]
12: /lib/tls/i686/cmov/libpthread.so.0 [0xb72f14fb]
13: /lib/tls/i686/cmov/libc.so.6(clone+0x5e) [0xb67f0e5e]