System hang on shutdown when running freebsd-update

[Walter Hop]

I’m revisiting this issue, since unfortunately I still have it more often than not when upgrading to 10.1-RELEASE.

As Kevin Oberman suspected earlier in the thread, the issue seems to lie in unmounting. The same hang occurs when dropping to single user mode and trying to re-mount root as readonly.

I’ve also had another unmount issue after upgrading to 10.1-RELEASE:

    All buffers synced.
    softdep_waitidle: Failed to flush worklist for 0xfffff800027b4330
    unmount of / failed (BUSY)

I’ve created a PR with the information I have: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195458

With the EOL date of FreeBSD 10.0 on the horizon, it’s making me a little skittish.
Any ideas of experiments I can do to get more info out of a problematic box, or other options to take?

Thanks!
WH

> On 28 Oct 2014, at 23:09, Walter Hop <freebsd at spam.lifeforms.nl> wrote:
> 
> I noticed this same hang after upgrading from 10.0-RELEASE to 10.1-RC3 in a VM running under VMware Fusion, so the problem appears still present.
> 
> I could only make it happen in the single uptime just after the system was freebsd-updated from FreeBSD 10.0 to 10.1-RC3.
> 
> Here is a screenshot: http://lf.ms/wait-for-reboot.png
> 
> It did not make any progress after 2 hours of waiting. When restarting the VM, the disk was dirty.
> 
> Some interesting facts:
> - Note "swapoff: /dev/da0p2: Cannot allocate memory" in the screenshot which might pose a clue. I haven’t seen this normally.
> - FreeBSD does respond to ping while it is busy, so it is not a complete "freeze".
> - The VM is at 100% CPU while this is going on.

-- 
Walter Hop | PGP key: https://lifeforms.nl/pgp