From: Grant Likely <grant.likely@xxxxxxxxxxxx>
Date: Mon, 13 Feb 2012 14:46:23 -0700
> Ugh; that looks bad. If it failed there, then the global device node list
> is corrupted. I hate to ask you this, but would you be able to git bisect to
> narrow down the commit that causes the problem?
Wild guess on all of these bugs, bad OF node reference counting and a
OF node is free'd up prematurely.
If you look at the sparc code that has been subsumed into the generic
drivers/of/ stuff over the past few years, you'll see that we never
consistently did any of the reference counting bits on the sparc side.
I never did it, because I don't anticipate ever having hot-plug
support for OF nodes.
Anyways, if you now start to mix the drivers/of/ stuff which
religiously does the reference counting with of_node_{get,put}()
with the remaining scraps of sparc code that doesn't... it might
not be pretty.
In the crash dump after your test patch, we are in
of_find_node_by_phandle() with a 'np' pointer in the allnodes list
equal to 0x50.
The signature in the original crash dump is identical, except
that time we were in of_find_node_by_path(), but again the 'np'
pointer was 0x50.
Something else that might be suspicious were the memblock changes
that happened this release cycle, so I wouldn't be surprised if
a bisect turned up something in there.
FWIW I've been running current kernels on my niagara boxes without
incident for several weeks.
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