Re: [Bluez-devel] Soft lockup

[Marcel Holtmann <marcel@holtmann.org>]

Hi Ville,

> Now I have more information about this problem.
> 
> I had debuggin enabled in net/bluetooth/rfcomm/core.c and I noticed that
> for some reson rfcomm_dlc_clear_timer() is called for allready freed
> dlc and lock_timer_base() gets stuck because it's trying to use invalid
> timer pointer. I also tried to reproduce bug in i386 without success.
> Also then debugging is on the bug much harder to reproduse. To me this
> looks like dlc locking doens't work as it should work.
> 
> And other notice. rfcomm_dlc_clear_timeri() uses timer_pending()
> together with del_timer() which allready calls timer_pending(). So
> timer_pending() is useless in rfcomm_dlc_clear_timer().

this all looks like we are missing a memory barrier somewhere. This
could also be the reason why it only gets triggered on OMAP systems. Any
further ideas?

Regards

Marcel




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