Need help fixing Alpha/DRM out of memory failure

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I'm seeing a DRM-related out of memory failure. I've filed a bug at
freedesktop.org [0], but no luck. Xserver-1.7 is near, and I'd like to
get this fixed before they make a major release.

When starting up X with a Radeon graphics card, X dies with an out of
memory error. See attached dmesg in bug report and small excerpt.

Trace:
[<fffffc0000384158>] __vmalloc_area_node+0xb8/0x1b0
[<fffffc00005248a0>] drm_sg_alloc+0x1c0/0x340
[<fffffc000051d7ac>] drm_ioctl+0x18c/0x3f0
[<fffffc0000524a20>] drm_sg_alloc_ioctl+0x0/0x20
[<fffffc00003a093c>] vfs_ioctl+0x6c/0x90
[<fffffc00003435e0>] autoremove_wake_function+0x0/0x60
[<fffffc00003a0b14>] do_vfs_ioctl+0xb4/0x6b0
[<fffffc00003a1214>] SyS_ioctl+0x104/0x110
[<fffffc000038f588>] SyS_write+0x68/0xe0
[<fffffc00003a117c>] SyS_ioctl+0x6c/0x110
[<fffffc0000310d14>] entSys+0xa4/0xc0

Using Option "DRI" "false" works around the problem.

I'd really appreciate any help.

Thanks,
Matt Turner

[0] http://bugs.freedesktop.org/show_bug.cgi?id=23671
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