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SubjectRe: Deadlock after info soft-safe -> soft-unsafe lock order detected
Andrew Morton <> wrote:
> I'd be suspecting the percpu counter work in TCP?

This is the bogus lockdep output which is fixed by

commit ea319518ba3de282c13ae1cf4bf2215c5e03e67e
Author: Peter Zijlstra <>
Date: Fri Dec 26 15:08:55 2008 +0100

locking, percpu counters: introduce separate lock classes

Impact: fix lockdep false positives

Classify percpu_counter instances similar to regular lock objects --
that is, per instantiation site.

The networking code has increased its use of percpu_counters, which
leads to false positives if they are treated as a single class.

Signed-off-by: Peter Zijlstra <>
Signed-off-by: Ingo Molnar <>

It was only pulled very recently despite the Dec 26 date.

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