Comments - mariabackup gives core dump
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So no write access, rather than being reported, causes a core dump? I'll put this down as bad design on mariadb devs!
I agree the assertion and core dump are of questionable value and are definitely of poor user experience.
An existing bug report MDEV-18200 asserts in the same location and I've tested a draft patch for consideration in fixing this.
Thank you for raising this.