On Tue, 20 Sep 2016, Darren Tucker wrote:

> On Tue, Sep 20, 2016 at 1:43 AM, Jan Stary <h...@stare.cz> wrote:
> >
> > This is current/i386 on an ALIX.1E (demsg below).
> > I have an USB disk connected for /backup.
> >
> > Upon every reboot, the filesystem on that disk is dirty:
> > WARNING: R/W mount of /backup denied.  Filesystem is not clean - run fsck
> I saw something similar on an APU where the root disk was on
> (USB-attached) sdcard:
> http://marc.info/?l=openbsd-misc&m=144237305322074&w=2
> It seems to be a race.  There used to be a 4sec pause in the kernel
> that was removed:
> """
> Remove 4 second delay on reboot/shutdown that was added 8 years
> ago to "workaround MP timeout/splhigh/scsi race at reboot time".
> """

I think before we re-add some arbitrary delays, we should check if we are 
actually sending an explicit cache flush command to the disk controllers. 
I have some code somewhere that does this for umount and mount -ur. I will 
look for it and send it to tech@, but probably not today.


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