Why was debug_coredump deleted?

#1

The documentation has an Analysing core dumps section that references running make debug_coredump, but that was deleted in cesanta/mongoose-os@9164e8a82. The comment isn’t very helpful: “Delete some junk along the way”. Was this intentional? Is there a new way to debug core dumps?

#2

That section is outdated.
If you use mos build --local (docker is needed) and run mos console in the root directory of your firmware, the core dump will be analysed automatically by mos.

#3

Thanks @nliviu, I’ll submit a pull request to update the documentation. I am doing a local build, and it doing a backtrace in gdb, as you suggested (thanks). However, the stack is basically empty. Is there a way to build with debug symbols?

[Sep  7 12:45:52.981] SW WDT @ 0x40002ef1
[Sep  7 12:45:52.983]  A0: 0x40002ef1  A1: 0x3ffff9e0  A2: 0x2c954987  A3: 0x00000015
[Sep  7 12:45:52.988]  A4: 0x019df0e1  A5: 0x000000ff  A6: 0x3ffef6d4  A7: 0x00000000
[Sep  7 12:45:52.994]  A8: 0x0000002b  A9: 0x00000170 A10: 0x00000005 A11: 0x00000020
[Sep  7 12:45:53.000] A12: 0x01e84800 A13: 0x2af7589a A14: 0x40200778 A15: 0x05defda0
[Sep  7 12:45:53.005]
[Sep  7 12:45:53.005] (exc SP: 0x3ffff7b0)
[Sep  7 12:45:53.007]
[Sep  7 12:45:53.007] --- BEGIN CORE DUMP ---
[Sep  7 12:45:53.010] mos: catching core dump
[Sep  7 12:45:55.856] ....
[Sep  7 12:46:04.562] ---- END CORE DUMP ----
[Sep  7 12:46:04.568] mos: wrote to /home/chris/src/si470x_examples/core-si470x_examples-esp8266-20200907-124604.098976141 (133144 bytes)
[Sep  7 12:46:04.568] mos: analyzing core dump
Core dump by si470x_examples/esp8266 0.7 20200907-194541/g37d3565-master-dirty
Using ELF file at: /home/chris/src/si470x_examples/build/objs/si470x_examples.elf
Using Docker image: docker.io/mgos/esp8266-build:2.2.x_a0b13112-r8
Running docker run --rm -v /home/chris/src/si470x_examples/build/objs/si470x_examples.elf:/fw.elf -v /home/chris/src/si470x_examples/core-si470x_examples-esp8266-20200907-124604.098976141:/core -v /home/chris/src/si470x_examples:/home/chris/src/si470x_examples docker.io/mgos/esp8266-build:2.2.x_a0b13112-r8 bash -c /usr/local/bin/serve_core.py --rom=/opt/Espressif/rom/rom.bin --rom_addr=0x40000000 /fw.elf /core & $MGOS_TARGET_GDB /fw.elf -ex 'target remote 127.0.0.1:1234' -ex 'set confirm off' -ex bt -ex quit
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Reading symbols from /fw.elf...
Remote debugging using 127.0.0.1:1234
0x40002ef1 in ?? ()
#0  0x40002ef1 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Detaching from program: /fw.elf, Remote target
Ending remote debugging.