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Added instructions for getting stack traces with gdb

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NanoAkron 2017-01-22 15:45:14 +00:00
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@ -385,6 +385,50 @@ If you want to help out, see CONTRIBUTING for a set of guidelines.
This section contains general instructions for debugging failed installs or problems encountered with Monero. First ensure you are running the latest version built from the github repo.
## Obtaining Stack Traces and Core Dumps on Unix Systems
We generally use the tool `gdb` (GNU debugger) to provide stack trace functionality, and `ulimit` to provide core dumps in builds which crash or segfault.
* To use gdb in order to obtain a stack trace for a build that has stalled:
Run the build.
Once it stalls, enter the following command:
```
gdb /path/to/monerod `pidof monerod`
```
Type `thread apply all bt` within gdb in order to obtain the stack trace
* If however the core dumps or segfaults:
Enter `ulimit -c unlimited` on the command line to enable unlimited filesizes for core dumps
Run the build.
When it terminates with an output along the lines of "Segmentation fault (core dumped)", there should be a core dump file in the same directory as monerod.
You can now analyse this core dump with `gdb` as follows:
`gdb /path/to/monerod /path/to/dumpfile`
Print the stack trace with `bt`
* To run monero within gdb:
Type `gdb /path/to/monerod`
Pass command-line options with `--args` followed by the relevant arguments
Type `run` to run monerod
## Analysing Memory Corruption
We use the tool `valgrind` for this.
Run with `valgrind /path/to/monerod`. It will be slow.
## LMDB
Instructions for debugging suspected blockchain corruption as per @HYC