CpuInfoProvider might return different values

[NeacsuCristian]

Hello,

I am trying to figure it out what is happening with different fingerprints on different running.
The main issue is that I found in CpuInfoProvider that reading /proc/cpuinfo multiple times, returns different values of BogoMIPS, therefore it will return different fingerprints.

For exemple reading /proc/cpuinfo at one run:
2021-08-31 00:59:15.463 15908-15938/eco.eep I/System.out: HERE: processor : 0
2021-08-31 00:59:15.465 15908-15938/eco.eep I/System.out: HERE: BogoMIPS : 33.17
2021-08-31 00:59:15.475 15908-15938/eco.eep I/System.out: HERE: processor : 1
2021-08-31 00:59:15.478 15908-15938/eco.eep I/System.out: HERE: BogoMIPS : 33.17
2021-08-31 00:59:15.482 15908-15938/eco.eep I/System.out: HERE: processor : 2
2021-08-31 00:59:15.483 15908-15938/eco.eep I/System.out: HERE: BogoMIPS : 26.08
2021-08-31 00:59:15.491 15908-15938/eco.eep I/System.out: HERE: processor : 3
2021-08-31 00:59:15.494 15908-15938/eco.eep I/System.out: HERE: BogoMIPS : 26.08

at second run:
2021-08-31 00:59:30.990 15994-16031/eco.eep I/System.out: HERE: c3e0428bf5fbd27f15932e800e87922a
2021-08-31 00:59:31.002 15994-16031/eco.eep I/System.out: HERE: processor : 0
2021-08-31 00:59:31.004 15994-16031/eco.eep I/System.out: HERE: BogoMIPS : 33.17
2021-08-31 00:59:31.009 15994-16031/eco.eep I/System.out: HERE: processor : 1
2021-08-31 00:59:31.010 15994-16031/eco.eep I/System.out: HERE: BogoMIPS : 33.17
2021-08-31 00:59:31.014 15994-16031/eco.eep I/System.out: HERE: processor : 2
2021-08-31 00:59:31.015 15994-16031/eco.eep I/System.out: HERE: BogoMIPS : 33.17
2021-08-31 00:59:31.021 15994-16031/eco.eep I/System.out: HERE: processor : 3
2021-08-31 00:59:31.024 15994-16031/eco.eep I/System.out: HERE: BogoMIPS : 33.17

at 3rd run:
2021-08-31 00:59:52.482 16083-16120/eco.eep I/System.out: HERE: processor : 0
2021-08-31 00:59:52.484 16083-16120/eco.eep I/System.out: HERE: BogoMIPS : 33.17
2021-08-31 00:59:52.488 16083-16120/eco.eep I/System.out: HERE: processor : 1
2021-08-31 00:59:52.489 16083-16120/eco.eep I/System.out: HERE: BogoMIPS : 26.08
2021-08-31 00:59:52.493 16083-16120/eco.eep I/System.out: HERE: processor : 2
2021-08-31 00:59:52.495 16083-16120/eco.eep I/System.out: HERE: BogoMIPS : 26.08
2021-08-31 00:59:52.500 16083-16120/eco.eep I/System.out: HERE: processor : 3
2021-08-31 00:59:52.503 16083-16120/eco.eep I/System.out: HERE: BogoMIPS : 26.08

Therefore the BogoMIPS in my case can be either 33.17 or 26.08, therefore the output of fingerprint will differ. Am I doing something wrong?

[Alexey-Verkhovsky]

Hello! 👋
Thanks for the report. You are doing everything right.
Looks like we need to improve this signal. Can you tell me what a device you are using?

[NeacsuCristian]

Hello

The device is an Lenovo Tab M7 tablet.
https://www.amazon.com/Lenovo-Quad-Core-Processor-Bluetooth-ZA55012US/dp/B084GZTYMW/ref=sr_1_3?dchild=1&keywords=lenovo+tab+m7&qid=1630515633&sr=8-3

I tried as well on Lenovo Tab M8 and it seems to work, but again I do not have a multitude of devices that I could try. But what I can guarantee is that /proc/cpuinfo on M7 is returning different results, and might be dangerous.

[Alexey-Verkhovsky]

Yes, it seems we need to choose more stable lines for STABLE fingerprint. Thanks again for the report. I'll close the issue when fixes are ready!

[Sergey-Makarov]

Reopened after automatic close. Will close it when the next release is ready.

[Sergey-Makarov]

Fixed in release 1.3.0