ZFS stalled after some mirror disks were lost

[Ben RUBSON]

> On 02 Oct 2017, at 23:06, Andriy Gapon <avg at FreeBSD.org> wrote:
> 
> Forgot to add.  It would be nice to determine an owner of spa_namespace_lock.
> If you have debug symbols then it can be easily done in kgdb on the live system:
> (kgdb) p spa_namespace_lock

Thank you very much Andriy for your deep analysis, much appreciated !
Unfortunately, I lost access to the server and had to recycle it :| ...

I have some everyday maintenance windows on this production infra,
so for sure plan is to try to reproduce the issue.

I will then let you know.

Thank you all again,

Ben