50 lines
1.1 KiB
Markdown
50 lines
1.1 KiB
Markdown
Generate coredump on the affected MariaDB server.
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```sh
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pgrep mariadbd | xargs gcore
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```
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This will create a `core.<x>` where `<x>` is the pid of MariaDB proces. The core file is likely to be `~5G` in size. Compress it.
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```sh
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gzip core.<x>
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```
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Compressed `core.<x>.gz` should be around `~5OM.
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---
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Build the MariaDB debug container.
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```sh
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docker build -t mariadb-debug:10.6 -f mariadb.Dockerfile .
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```
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This has the latest MariaDB 10.6 with all the debug symbols necessary to generate a useful stacktrace.
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---
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Copy the coredump locally for debugging.
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```
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scp -C -oProxyCommand="ssh -o 'ForwardAgent yes' frappe@frappe.cloud 'ssh-add && nc %h %p'" root@m<y>-mumbai.frappe.cloud:/root/core.<x>.gz .
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```
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Extract the compressed core file.
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```sh
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gzip -d core.<x>.gz
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```
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You'll get the `core.<x>` file back. Generate complete stacktrace.
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```sh
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docker run -v ./core.<x>:/core -v --rm -it mariadb-debug:10.6 gdb --batch --eval-command="set print frame-arguments all" --eval-command="thread apply all bt full" /usr/sbin/mariadbd /core > stack.txt
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```
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or launch gdb.
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```sh
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docker run -v ./core.<x>:/core -v --rm -it mariadb-debug:10.6 gdb /usr/sbin/mariadbd /core
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```
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