[Bug 26812] New: Radeon module causes hard reset on modprobe

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=26812

           Summary: Radeon module causes hard reset on modprobe
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.37-git9
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: mjevans1983 at gmail.com
        Regression: No


I'm using the git snapshots between when Linus merged from drm-core-next and
when network drivers were merged (breaks build).

If there is a better patch relative to a released source I'll gladly test it
too; however the other sources I tried also had similar issues.

When radeon.ko (or build in init) starts the screens blank and a few seconds
later the system completely reboots.  This is 100% repeatable.

I have firmware from Arch's (AUR) linux-firmware-git package installed,
/lib/firmware pointed as the source, and the relevant blobs for the recent
ATI/AMD GPUs.

When built as a module I can modprobe radeon to trigger the exact same
behavior.

Problems debugging:
* It resets so hard there isn't a peep from netconsole.
* It resets so hard that my disks loose md raid sync and need to completely
rebuild (yeah, I know, I'll add a write-intent log before I test this again
next time...; it wasn't an issue before I got the brainwave of making it a
module to try to give netconsole/syslog time to get setup.)

How can I possibly approach isolating this?  Even a link to the correct
documentation would be helpful.

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