RE: [Linux-ia64] Linux kernel deadlock caused by spinlock bug

David Mosberger (
Mon, 29 Jul 2002 14:48:39 -0700

>>>>> On Mon, 29 Jul 2002 16:29:09 -0500, "Van Maren, Kevin" <> said:

Van> Yes, but that isn't the point: unless you eliminate all rw
Van> locks, it is conceptually possible to cause a kernel deadlock
Van> by forcing contention on the locks you didn't remove, if the
Van> user can force the kernel to acquire a reader lock and if
Van> something else needs to acquire the writer lock. Correctness
Van> is the issue, not performance.

I agree with Kevin here. There must be some argument as to why
readers cannot indefinitely lock out a writer. A probabilistic
argument is fine, but just saying "contention doesn't happen"
certainly isn't good enough.

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