[Bug 23847] kernel BUG when using nouveau

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23847





--- Comment #8 from Xavier <shiningxc-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-15 14:13:39 PST ---
Some new information :
* CONFIG_DEBUG_SPINLOCK (spinlock and rw lock debugging : basic checks) works
around the problem (it leads to very stable nouveau kms)
* maxcpus=1 does not workaround the problem
* traces are not always in cfq code
* traces only happen when nouveau is loaded
* other framebuffer drivers work fine (vesafb, uvesafb, nvidiafb)
* crash are (almost?) always with kms on
* crash can happen both at boot or when reloading module
* crash seem more frequent when nouveau is loaded by udev or in early boot,
rather than loaded with X
* happen both with 2.6.31-rc8 (nouveau-git) and 2.6.31 stable


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