[Ovmsdev] Investigating crashes. And, OVMS stopped collecting data

[Steve Davies]

Hi,

I went for a scenic drive partly to test my OVMS I3 stuff and feeding data
to ABRP.

When I got home I found that ABRP had my drive ending say 15km from home.
And when I checked OVMS it also thought I was in the same spot.

[6315S] v.p.altitude                             65.4m
[6315S] v.p.direction                            97.5°
[6315S] v.p.gpshdop                              1
[9999S] v.p.gpslock                              yes
[6315S] v.p.gpsmode                              AN
[6315S] v.p.gpsspeed                             18.7052km/h
[6315S] v.p.latitude                             -34.0808
[-----] v.p.location
[6315S] v.p.longitude                            18.4327
[5282S] v.p.odometer                             14901km
[6315S] v.p.satcount                             9
[5195S] v.p.speed                                0km/h
[5195S] v.p.trip                                 85km

You can see that the metrics are very old (I show more digits in my
version).

I then looked further and no metrics seemed to be updating - for instance
the m.time.utc wasn't updating.

I was starting to look at it when my OVMS rebooted (which seems to happen
sometimes.  I've also had the logging stop - I noticed one less task so I
presume that's related).


Last boot was 127 second(s) ago
Time at boot: 2020-12-31 19:10:09 SAST
This is reset #8 since last power cycle
Detected boot reason: Crash (12/12)
Reset reason: Exception/panic (4)
Crash counters: 1 total, 0 early

Last crash: LoadProhibited exception on core 1
Registers:
PC : 0x400f0161 PS : 0x00060a30 A0 : 0x800f023a A1 : 0x3ffe5920
A2 : 0x3ffb5738 A3 : 0x00000000 A4 : 0x3f8566a8 A5 : 0x00000001
A6 : 0x3ffe5990 A7 : 0x3f8567d0 A8 : 0x800f015c A9 : 0x3ffe5910
A10 : 0x00000000 A11 : 0x3f414cb1 A12 : 0x00000002 A13 : 0x00000001
A14 : 0x000000fe A15 : 0x3ffd4f90 SAR : 0x00000004 EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x4008bcf1 LEND : 0x4008bd01 LCOUNT : 0xfffffffd
Backtrace:
0x400f0161 0x400f0237 0x400fe87f 0x40103d4b 0x40103f02 0x400fe8af 0x4013a432
Version: 3.2.015-267-g39dba375-dirty/ota_1/main (build idf
v3.3.4-845-gd59ed8bba-dirty Dec 26 2020 15:37:52)

After this crash and restart m.time.utc was empty. I rebooted and its still
missing - does it only appear once NTP syncs or something?

Also I have no GPS position, gpsmode or anything like that (but I have a 3G
session with the hologram sim and roaming on one of the local cellular
operators).

I've made sure the GPS puck is out in the open and I guess I'll wait - does
the time come from the GPS?  And any ideas why I'm not getting a GPS lock
suddenly?

Apart from that - how do I debug crashes?  I went looking for some sort of
loader memory map in the build directory to try turn the PC and backtrace
addresses into something more useful but didn't pick up anything.

Thanks
Steve
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