After 12.x upgrade: mysqld RET _umtx_op -1 errno 45 Operation not supported

[Konstantin Belousov]

On Mon, Apr 15, 2019 at 08:01:27AM +0000, Marcin Cieslak wrote:
> Hello,
> 
> for archival purposes I am running an ancient (__FreeBSD_version 602100) 
> jail with mysqld inside.
> 
> This was working fine when the jail host was running 10.4. After upgrade to 12.x
> (r345375) mysqld process starts but it hangs before PID is created and the
> socket opened.
> 
> Quick ktrace on the process shows this coming up all the time:
> 
>  50766 mysqld   CALL  _umtx_op(0x966eaa0,UMTX_OP_RESERVED0,0x18cab,0,0)
>  50766 mysqld   RET   _umtx_op -1 errno 45 Operation not supported
> 
> What has changed, can I somehow bring it up again? (I understood that
> we keep compatibility with very old userland).

I believe these ops were removed at r263318.