Mask anomalies

Using a mask with mode 5800 fails unless the mask is identical in length as the password. I've experimented with custom masks and have the same result. Oddly, if I use the -i increment option with a mask of a different length than the password, oclhashcat again hits.

This may be the case in other modes, but I've not yet tested. Is this a bug, or am I failing to understand something?

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Matching example, 4-digit mask for a 4-digit pin:

[font=Courier]$ ./cudaHashcat64.bin -a3 -m5800 XXXXXXXXXXD952CF75FCFE8690FBCDXXXXXXXXXX:fb46e794ee6e8ffa ?d?d?d?d
cudaHashcat v1.00 starting...

Hashes: 1 total, 1 unique salts, 1 unique digests
Bitmaps: 8 bits, 256 entries, 0x000000ff mask, 1024 bytes
Applicable Optimizers:
* Zero-Byte
* Single-Hash
* Single-Salt
* Brute-Force
Watchdog: Temperature abort trigger set to 90c
Watchdog: Temperature retain trigger set to 80c
Device #1: GeForce 9500 GT, 1023MB, 1375Mhz, 4MCU
Device #1: WARNING! Kernel exec timeout is not disabled, it might cause you errors of code 702
Device #1: Kernel ./kernels/4318/m5800.sm_11.64.ptx
Device #1: Kernel ./kernels/4318/markov_le_v1.64.ptx
Device #1: Kernel ./kernels/4318/bzero.64.ptx

XXXXXXXXXXd952cf75fcfe8690fbcdXXXXXXXXXXX:fb46e794ee6e8ffa:3896

Session.Name...: cudaHashcat
Status.........: Cracked
Input.Mode.....: Mask (?d?d?d?d) [4]
Hash.Target....: XXXXXXXXXXd952cf75fcfe8690fbcdXXXXXXXXXX:fb46e794ee6e8ffa
Hash.Type......: Samsung Android Password/PIN
Time.Started...: Fri Dec 27 10:03:45 2013 (1 sec)
Speed.GPU.#1...: 22501 H/s
Recovered......: 1/1 (100.00%) Digests, 1/1 (100.00%) Salts
Progress.......: 9216/10000 (92.16%)
Rejected.......: 0/9216 (0.00%)
HWMon.GPU.#1...: -1% Util, 44c Temp, 100% Fan

Started: Fri Dec 27 10:03:45 2013
Stopped: Fri Dec 27 10:03:46 2013

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Missing example, 5-digit mask for a 4-digit pin:

$ ./cudaHashcat64.bin -a3 -m5800 XXXXXXXXXXD952CF75FCFE8690FBCDXXXXXXXXXX:fb46e794ee6e8ffa:fb46e794ee6e8ffa ?d?d?d?d?d
cudaHashcat v1.00 starting...

...

Session.Name...: cudaHashcat
Status.........: Exhausted
Input.Mode.....: Mask (?d?d?d?d?d) [5]
Hash.Target....: XXXXXXXXXXd952cf75fcfe8690fbcdXXXXXXXXXXX:fb46e794ee6e8ffa:fb46e794ee6e8ffa
Hash.Type......: Samsung Android Password/PIN
Time.Started...: Fri Dec 27 10:07:41 2013 (5 secs)
Time.Estimated.: 0 secs
Speed.GPU.#1...: 24305 H/s
Recovered......: 0/1 (0.00%) Digests, 0/1 (0.00%) Salts
Progress.......: 100000/100000 (100.00%)
Rejected.......: 0/100000 (0.00%)
HWMon.GPU.#1...: -1% Util, 44c Temp, 100% Fan

Started: Fri Dec 27 10:07:41 2013
Stopped: Fri Dec 27 10:07:46 2013

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Matching example with the -i increment option, 5-digit mask for a 4-digit pin:

$ ./cudaHashcat64.bin -a3 -m5800 -i XXXXXXXXXXD952CF75FCFE8690FBCDXXXXXXXXXX:fb46e794ee6e8ffa ?d?d?d?d?d
cudaHashcat v1.00 starting...

...

XXXXXXXXXXd952cf75fcfe8690fbcdXXXXXXXXXXX:fb46e794ee6e8ffa:fb46e794ee6e8ffa:3896​

Session.Name...: cudaHashcat
Status.........: Cracked
Input.Mode.....: Mask (?d?d?d?d) [4]
Hash.Target....: XXXXXXXXXXd952cf75fcfe8690fbcdXXXXXXXXXXX:fb46e794ee6e8ffa:fb46e794ee6e8ffa
Hash.Type......: Samsung Android Password/PIN
Time.Started...: Fri Dec 27 10:10:33 2013 (1 sec)
Speed.GPU.#1...: 22487 H/s
Recovered......: 1/1 (100.00%) Digests, 1/1 (100.00%) Salts
Progress.......: 9216/10000 (92.16%)
Rejected.......: 0/9216 (0.00%)
HWMon.GPU.#1...: -1% Util, 43c Temp, 100% Fan

Started: Fri Dec 27 10:10:33 2013
Stopped: Fri Dec 27 10:10:35 2013

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Thanks in advance for any assistance.