> > I have currently nmi_watchdog=1 which works (NMI interrupts show up during
> > normal operation), but there is no backtrace visible or producable during
> > the freeze, sorry.
>
> How is that possible? If the NMI watchdog works but doesn't fire, the
> lockup should respond to SysRq-T. Could you please try SysRq-T *before*
> the hang just to verify that it would work?
Well, the thing I don't really understand about SysRq-X is that the output is
visible by dmesg-command, but I cannot see anything on the console (single user
tested). This means it may well work in the hang-case, but as I cannot execute
dmesg I will never see it...
Regards,
Stephan
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