Re: GekkoScience 2Pac BM1384 Stickminer Official Support Thread
I have one 2pac (out of 20) that when i plug in hashes fine for a while but then goes zombie. the /var/log/messages and /var/log/syslog just keep showing cp210x converter detected , cp210x converter attached , cp210x converter disconnected. over and over until it crashes my raspberry pi (aprox every 6-10 hours) I have tried different ports and voltages but nothing. The fact that I have 19 others hashing away fine leads me to believe it's the stick but I want ask officially before i bug sidehack (again) 
We are having similar issues. I have four devices that on the surface appeared to be working but I too would have random crashes on my Pi that would require a hard power cycle (I mentioned this earlier in the thread but I figured it was something I borked so I let it drop). Now suddenly all four of my sticks won't start processing and looking through the log files you mention above I see very similar messages in the logs.
Code:
Apr 2 22:00:31 pihole kernel: [ 931.948102] usbserial: USB Serial support registered for generic
Apr 2 22:00:31 pihole kernel: [ 931.953159] usbcore: registered new interface driver cp210x
Apr 2 22:00:31 pihole kernel: [ 931.953445] usbserial: USB Serial support registered for cp210x
Apr 2 22:00:31 pihole kernel: [ 931.953788] cp210x 1-1.2.1:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.954541] usb 1-1.2.1: cp210x converter now attached to ttyUSB0
Apr 2 22:00:31 pihole kernel: [ 931.954732] cp210x 1-1.2.3:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.955378] usb 1-1.2.3: cp210x converter now attached to ttyUSB1
Apr 2 22:00:31 pihole kernel: [ 931.955599] cp210x 1-1.2.4.1:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.956909] usb 1-1.2.4.1: cp210x converter now attached to ttyUSB2
Apr 2 22:00:31 pihole kernel: [ 931.957103] cp210x 1-1.2.4.3:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.962106] usb 1-1.2.4.3: cp210x converter now attached to ttyUSB3
Apr 2 22:00:31 pihole kernel: [ 932.389891] cp210x ttyUSB3: cp210x converter now disconnected from ttyUSB3
Apr 2 22:00:31 pihole kernel: [ 932.390015] cp210x 1-1.2.4.3:1.0: device disconnected
Apr 2 22:00:31 pihole kernel: [ 932.575958] cp210x ttyUSB2: cp210x converter now disconnected from ttyUSB2
Apr 2 22:00:31 pihole kernel: [ 932.576083] cp210x 1-1.2.4.1:1.0: device disconnected
Apr 2 22:00:32 pihole kernel: [ 932.764863] cp210x ttyUSB1: cp210x converter now disconnected from ttyUSB1
Apr 2 22:00:32 pihole kernel: [ 932.764987] cp210x 1-1.2.3:1.0: device disconnected
Apr 2 22:00:32 pihole kernel: [ 932.983977] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
Apr 2 22:00:32 pihole kernel: [ 932.984098] cp210x 1-1.2.1:1.0: device disconnected
Apr 2 22:02:26 pihole rsyslogd-2007: action 'action 17' suspended, next retry is Sun Apr 2 22:02:56 2017 [try http://www.rsyslog.com/e/2007 ]
Apr 2 22:03:21 pihole kernel: [ 1102.140316] cp210x 1-1.2.4.3:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.141172] usb 1-1.2.4.3: cp210x converter now attached to ttyUSB0
Apr 2 22:03:21 pihole kernel: [ 1102.144290] cp210x 1-1.2.3:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.145092] usb 1-1.2.3: cp210x converter now attached to ttyUSB1
Apr 2 22:03:21 pihole kernel: [ 1102.146084] cp210x 1-1.2.1:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.147339] usb 1-1.2.1: cp210x converter now attached to ttyUSB2
Apr 2 22:03:21 pihole kernel: [ 1102.150360] cp210x 1-1.2.4.1:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.151134] usb 1-1.2.4.1: cp210x converter now attached to ttyUSB3
Apr 2 22:03:21 pihole rsyslogd-2007: action 'action 17' suspended, next retry is Sun Apr 2 22:03:51 2017 [try http://www.rsyslog.com/e/2007 ]
Apr 2 22:00:31 pihole kernel: [ 931.953159] usbcore: registered new interface driver cp210x
Apr 2 22:00:31 pihole kernel: [ 931.953445] usbserial: USB Serial support registered for cp210x
Apr 2 22:00:31 pihole kernel: [ 931.953788] cp210x 1-1.2.1:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.954541] usb 1-1.2.1: cp210x converter now attached to ttyUSB0
Apr 2 22:00:31 pihole kernel: [ 931.954732] cp210x 1-1.2.3:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.955378] usb 1-1.2.3: cp210x converter now attached to ttyUSB1
Apr 2 22:00:31 pihole kernel: [ 931.955599] cp210x 1-1.2.4.1:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.956909] usb 1-1.2.4.1: cp210x converter now attached to ttyUSB2
Apr 2 22:00:31 pihole kernel: [ 931.957103] cp210x 1-1.2.4.3:1.0: cp210x converter detected
Apr 2 22:00:31 pihole kernel: [ 931.962106] usb 1-1.2.4.3: cp210x converter now attached to ttyUSB3
Apr 2 22:00:31 pihole kernel: [ 932.389891] cp210x ttyUSB3: cp210x converter now disconnected from ttyUSB3
Apr 2 22:00:31 pihole kernel: [ 932.390015] cp210x 1-1.2.4.3:1.0: device disconnected
Apr 2 22:00:31 pihole kernel: [ 932.575958] cp210x ttyUSB2: cp210x converter now disconnected from ttyUSB2
Apr 2 22:00:31 pihole kernel: [ 932.576083] cp210x 1-1.2.4.1:1.0: device disconnected
Apr 2 22:00:32 pihole kernel: [ 932.764863] cp210x ttyUSB1: cp210x converter now disconnected from ttyUSB1
Apr 2 22:00:32 pihole kernel: [ 932.764987] cp210x 1-1.2.3:1.0: device disconnected
Apr 2 22:00:32 pihole kernel: [ 932.983977] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
Apr 2 22:00:32 pihole kernel: [ 932.984098] cp210x 1-1.2.1:1.0: device disconnected
Apr 2 22:02:26 pihole rsyslogd-2007: action 'action 17' suspended, next retry is Sun Apr 2 22:02:56 2017 [try http://www.rsyslog.com/e/2007 ]
Apr 2 22:03:21 pihole kernel: [ 1102.140316] cp210x 1-1.2.4.3:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.141172] usb 1-1.2.4.3: cp210x converter now attached to ttyUSB0
Apr 2 22:03:21 pihole kernel: [ 1102.144290] cp210x 1-1.2.3:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.145092] usb 1-1.2.3: cp210x converter now attached to ttyUSB1
Apr 2 22:03:21 pihole kernel: [ 1102.146084] cp210x 1-1.2.1:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.147339] usb 1-1.2.1: cp210x converter now attached to ttyUSB2
Apr 2 22:03:21 pihole kernel: [ 1102.150360] cp210x 1-1.2.4.1:1.0: cp210x converter detected
Apr 2 22:03:21 pihole kernel: [ 1102.151134] usb 1-1.2.4.1: cp210x converter now attached to ttyUSB3
Apr 2 22:03:21 pihole rsyslogd-2007: action 'action 17' suspended, next retry is Sun Apr 2 22:03:51 2017 [try http://www.rsyslog.com/e/2007 ]
I don't think the sticks are bad, but there is definitely something not right.