Deadlock with umount -f involving tmpfs on top of ZFS on r271170

[Bryan Drewery]

On 9/23/2014 8:12 AM, Konstantin Belousov wrote:
> On Mon, Sep 22, 2014 at 09:07:56PM -0500, Bryan Drewery wrote:
[...]
> There is indeed some write op in flight on the tmpfs mount, which
> blocks unmount suspension.  The 'bt all' from ddb would give some
> overview of the threads states.
> 
> Follow
> https://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
> to gather required information.
> 

I tried your patch and still ran into the deadlock. Here is the debug
information: https://people.freebsd.org/~bdrewery/vfs_deadlock.2.txt

-- 
Regards,
Bryan Drewery

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