Re: Problems with blkid hanging.

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On Mon, 24 Feb 2020 20:02:08 +0000 (UTC)
George R Goffe via test <test@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

> I have done "strace -xvfp <pid>" on all the processes listed. NONE
> are running. ALL "say" they're waiting on a system call like wait or
> read except for the blkid process which reports NOTHING. I tried
> killing the blkid process but that just schedules, IIRC,  a kill
> signal against it's process but since that process doesn't seem to be
> getting any cpu time, the kill will NEVER complete.
> 
> I'm not sure what to do at this point. Write another bug report?

You are upgrading in a virtual machine.  Does the virtual process have
direct access to the hardware?  If blkid is looking for real disk ids
and doesn't have access to them, it is probably going to hang.  In top
it should look like D I think, uninterruptible sleep.  It is
impossible to kill such tasks.

Now this could be a bug in blkid, if it is supposed to be able to get
block ids while running in virtual machines.  But that seems like a
pretty big if to me.
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