#6 Segmentation fault during PIE/PIF scan on Benq DW1640

[Anonymous]

At some moment during PIE/PIF scan on Benq DW1640,
qpxtool segfaults. The last messages that it outputs to
the console are:

Data block found...
| 00 64 76 64 03 34 34 0C | 8F 60 00 0D 00 05 00 04 |
00 00 00 00 00 00 00 02 | 00 02 00 8E 00 00 00 00 |
LBA: 626528; PIE: 13; PIF: 0
....
Data block found...
| 00 64 76 64 03 34 34 0C | 8F E0 00 0D 00 08 00 05 |
00 00 00 00 00 00 00 00 | 00 01 00 00 00 00 00 00 |
LBA: 626656; PIE: 13; PIF: 0
....
Data block found...
| 00 64 76 64 03 34 34 0C | 90 60 00 0A 00 04 00 04 |
00 00 00 00 00 00 00 02 | 00 02 00 B6 00 00 00 00 |
LBA: 626784; PIE: 10; PIF: 0
pos: 631040 / 1625472 || PIE: 21 max, 13 cur, 23277
tot ||PIF: 5 max, 0 cur, 525 tot ||POF: 0
max, 0 cur, 0 tot ||
....
Data block found...
| 00 64 76 64 03 34 34 5F | 75 D2 00 03 00 02 00 02 |
00 00 00 00 00 00 00 01 | 00 00 00 0A 00 00 00 00 |
LBA: 6059474; PIE: 3; PIF: 0
pos: 631168 / 1625472 || PIE: 21 max, 3 cur, 23280
tot ||PIF: 5 max, 0 cur, 525 tot ||POF: 0
max, 0 cur, 0 tot ||
...
Data block found...
| 00 64 76 64 03 34 34 28 | CF 92 00 04 00 02 00 01 |
00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |
LBA: 2477970; PIE: 4; PIF: 0
pos: 2476416 / 1625472 || PIE: 21 max, 4 cur,
23284 tot ||PIF: 5 max, 0 cur, 525 tot ||POF:
0 max, 0 cur, 0 tot ||

I suppose that the reason is too largre (larger than
the disk size) LBA values, returned by the drive, or
nonmonotony of them (626784->6059474->2477970).

The disk being checked was multi-session DVD+R, which
possibly may be the reason of strange LBA values.