linux-kernel - [BISECTED] x11 fbdev on intelfb hangs hard after 66c1ca019078220dc1bf968f2bb18421100ef147

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Message-Id: <1239314524.7390.14.camel@mj>
Date:	Thu, 09 Apr 2009 18:02:04 -0400
From:	Pavel Roskin <proski@....org>
To:	Andrea Righi <righi.andrea@...il.com>, linux-kernel@...r.kernel.org
Cc:	stable@...nel.org
Subject: [BISECTED] x11 fbdev on intelfb hangs hard after
 66c1ca019078220dc1bf968f2bb18421100ef147

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@...nel.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.

-- 
Regards,
Pavel Roskin

View attachment "xorg.conf" of type "text/plain" (2453 bytes)

View attachment "config-minimal" of type "text/plain" (29464 bytes)

View attachment "lspci" of type "text/plain" (1832 bytes)