RFR: 8374507: GHA: Limit debug symbols generation to conserve disk space

[Christoph Langer]

On Tue, 6 Jan 2026 07:38:19 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> I have noticed that Linux x86_64 fastdebug build jobs started to fail in GHA with no free space left on device. Instrumenting GHA runs shows we have about 17G of free space on those runners. 
>> 
>> 
>> Filesystem  Size  Used  Avail Use% Mounted on
>> /dev/root    72G   56G   17G   78% /
>> 
>> 
>> [GHA docs](https://docs.github.com/en/actions/reference/runners/github-hosted-runners#standard-github-hosted-runners-for-public-repositories) say there is 14G of guaranteed disk space on runners. This is a bit beyond what our fastdebug builds need. My local build says disabling debug symbols bundling reduces the space requirement from 16G -> 11G, without regressing tests.
>> 
>> Testing:
>>  - [x] Ad-hoc JVM crash to verify that stack trace generation still works
>>  - [x] GHA
>
> Thank you! I am integrating now to unbreak GHA.

@shipilev I'm a bit late to the game here but maybe we should try --with-external-symbols-in-bundles=public on Windows in order to get file and method names in case of crashes. Not sure whether it'll be again too much of disk space needed, though...

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PR Comment: https://git.openjdk.org/jdk/pull/29030#issuecomment-3713728295