drm2, i915kms cause instant lock-up

Mateusz Guzik mjguzik at gmail.com
Mon Feb 20 23:58:11 UTC 2017

On Mon, Feb 20, 2017 at 03:52:24PM -0800, Steve Kargl wrote:
> With a kernel and world from r313943 sources (circa
> Feb 19, 2017), kldload of either drm2.ko or i915kms.ko
> will lock up the system.  There is no keyboard response,
> screen output, or panic.  Just a locked up system.
> A kernel from r313027 and its modules boots fine.
> 'kldload drm2.ko' yields the following in /var/log/messages:

There were quite a few invasive changes in this timeframe. Can you

1. switch to 313254 and ensure it works
2. apply https://people.freebsd.org/~mjg/patches/complete-locks.diff and
check if it breaks

If it does not break, revert the patch and bisect the kernel please.
Otherwise I'll devise smaller diffs to narrow this down.

Mateusz Guzik <mjguzik gmail.com>

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