> Either we must demand that CPU 2 uses irq-safe spinlocks in order to
> protect against sk->write_space(),
Never. :-)
> or we must demand that CPU 1 should drop
> 'lock1' before being allowed to call dev_kfree_skb_any().
Yes, alas.
Being pretty evident after seen once, this rule was _not_ evident for me
until yesterday. Actually, this is very sad observation, because core
has no way to detect this is a generic way...
Alexey
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