[Bug 36255] New: [r128] Kernel panic after killing X since 2.6.37

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=36255

           Summary: [r128] Kernel panic after killing X since 2.6.37
           Product: DRI
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/other
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: connor.behan at gmail.com


Created an attachment (id=45651)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=45651)
Dmesg output

I have seen this bug in kernels 2.6.38, 2.6.37 and NOT 2.6.36. Every time I
quit the Xserver using the Xfce session manager, the message printed on the
console it returns to is:

EIP: [<e168ef557>] r128_driver_irq_handler +0x15/0x50 [r128] SS:ESP
0068:df007fac
CR2: 00000000e08c8044
--- [ end trace 632129fdd65eae19 ] ---
Kernel panic - not syncing: Fatal exception in interrupt
Pid: 0, comm: swapper tainted: G D 2.6.38-ARCH #1
Call trace:

*some calls including r128_driver_irq_handler and other IRQ functions*

And I have to reboot with Alt+SysRq+REISUB. This only happens when I quit X
using the functions in the Xfce session manager. The return to the console will
be fine if I use Ctrl+Alt+Backspace, "sudo killall X", or Ctrl+Alt+F1 followed
by Ctrl+C. I admit that this is vague information but I simply cannot get an
answer our of the Xfce developers as to what function is being used.