Re: Real-Time Preemption and RCU

[Manfred Spraul]

Ingo Molnar wrote:

> which precise locking situation do you mean?
>
>  
cpu 1:
acquire random networking spin_lock_bh()

cpu 2:
read_lock(&tasklist_lock) from process context
interrupt. softirq. within softirq: try to acquire the networking lock.
* spins.

cpu 1:
hardware interrupt
within hw interrupt: signal delivery. tries to acquire tasklist_lock.

--> deadlock.

--
   Manfred
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