webtag #ProgramUpTime

[HansR]

This morning the #ProgramUpTime webtag produced an erroneous value. Normally it is correct.
See attachment. I checked the code and come to the conclusion it must be an error in the library. Let's see if it changes.
The source before processing is:

Code: Select all

Linux/Unix

System uptime: 3 weeks, 4 days, 21 hours
Cumulus uptime: <#ProgramUpTime>

System: Raspberry Pi 3 Model B Plus Rev 1.3
Processor: ARMv7 Processor rev 4 (v7l)
Nr of processors: <#CpuCount>
OS: Linux 4.19.75-v7+ armv7l
Description: Raspbian GNU/Linux 10 (buster)
Mono JIT compiler version 6.4.0.198 (tarball Tue Sep 24 01:45:47 UTC 2019)

[Phil23]

Tried Summing the numbers to see if it looked like a signed integer roll-over, but nothing seems obvious.

Capture.JPG

[ExperiMentor]

Stacks overflow. Dynamic memory allocation gets out of hand. Indices extend and overwrite data. Power glitches corrupt RAM content.
Yes, I know it shouldn't happen, but it does.

Best practice is to always schedule occasional system reboots. They can avoid all sorts of odd problems like this ...

[HansR]

@Phil: thanks for trying. "Though this be madness, yet there is method in 't." So this is worse: no system in numbers, I guess @ExperiMentor has his point
@ExperiMentor: You're right. Roughly 24 hours later the Raspberry went wild in an infinite loop writing to the SD card. Some 2 Gb were written, the system became unresponsive and I am still trying to recover it. Hmm... would this be a consequence of migrating to Buster? Anyway, there are many upgradables so I guess it's maintenance time.