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Final notes and verdict.
Indexer files appeared because dump-stack called dmcc.sh in the same /usr/bin/ location.
I am not really sure why dump-stack was called at all from dump-and-kill-cvm in /usr/bin/ , because it only checks for the file /PRE_GM_DEBUGGING_FEATURES_ENABLED__REMOVE_AT_GMC (which is required to be present by the JB).
Maybe main question is why dump-and-kill-cvm is called at all. But I couldn't find it.
For now, I just did (with mntroot rw/ro around it)
ln -s -b /dev/null /usr/bin/dump-stack
and it stopped from logs and dumps appearing (no more DISABLE_CORE_DUMP files needed).
dmcc.sh says in the header that this script is intended to be present only on debug devices, not on production ones. So, I think it is safe...?
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