From: Andrew Morton on
On Tue, 06 Apr 2010 11:08:22 -0700 (PDT) Ben Gamari <bgamari.foss(a)> wrote:

> ...
> I just built 2.6.34-rc3 with the appropriate fixes for the ACPI thermal lockdep
> issues and have attached the dmesg output of the crash below. It appears that
> modprobe is freezing with a few locks held while inserting aes.ko. In
> particular, it seems that the kernel is deadlocking inside of stop_machine()
> while flushing workqueues.
> ...

My guess would be that ieee80211 is calling crypto->request_module()
under rtnl_lock, and the fact that rtnl_lock is held is causing
modprobe->stop_machine to not complete.

> P.S. I am now quite certain that I was mistaken in saying that 2.6.33 was
> affected. This seems to just be a 2.6.34 issue.

OK, thanks, I'll ask Rafael and Maciej to track this as a post-2.6.33
regression, probably wireless.

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