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SubjectRe: [BISECTED] x11 fbdev on intelfb hangs hard after 66c1ca019078220dc1bf968f2bb18421100ef147
On Thu, Apr 09, 2009 at 06:02:04PM -0400, Pavel Roskin wrote:
> Hello!
>
> I'm running the latest wireless-testing.git kernel, which is 2.6.30-rc1
> plus some wireless bits. I use intelfb with kernel mode switching and
> X11 using fbdev. This runs on Fedora 10, fbdev driver is
> xorg-x11-drv-fbdev-0.3.1-7.fc9.x86_64.
>
> This worked fine with Linux 2.6.29, but after upgrading to 2.6.30-rc1
> X11 hangs hard.
>
> Bisecting found commit 66c1ca019078220dc1bf968f2bb18421100ef147 to be
> responsible. It can be reverted on top of 2.6.30-rc1, and the resulting
> kernel is working fine. The commit is called:
>
> fbmem: fix fb_info->lock and mm->mmap_sem circular locking dependency
>
> I'm especially concerned to see stable@kernel.org in the cc in the log.
> This patch fails on two systems for me, so it's hardly ready for stable
> kernels.
>
> The kernel config (very minimal, I used it to speed up bisecting),
> xorg.conf and lspci output are attached.

Thanks for reporting Pavel. I agree to revert 66c1ca ASAP.

See also http://lkml.org/lkml/2009/4/9/177.

-Andrea


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