strange mysql bug, possibly thread related

[Petr Salinger]

>> Robin, Konstantinos, please, can you test to change
>> user of mysql and clamd to root ?
>> After that, it should work with latest glibc.

> Tested running mysql as user root and indeed it works with the latest
> libc/kernel combination.

Aurelien kindly prepared new kernel revision with proposed patch.
With this kernel (5.4-9) and latest glibc (2.3-1+kbsd.14) it should work 
again with user clamd/mysql. Can you retest, please ?

Petr