[BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix

From	Chris Bainbridge <chris.bainbridge@gmail.com>
Newsgroups	linux.kernel
Subject	[BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix
Date	2016-03-21 22:50 +0100
Message-ID	<rffS2-34o-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

I was testing something on an old server (Dell T105 opteron) and noticed
packet loss after updating the kernel from 3.10 to 4.5. The test was:

On Dell run: iperf -s
On another system: iperf3 -c dell -u -b 20M -l 1k -t 1000

This sends a 20mbit UDP stream to the Dell. It works fine normally (0%
packet loss), but when CONFIG_PROVE_LOCKING is enabled there is high
(35%) packet loss. (DEBUG_LOCKDEP also seems to cause packet loss)

The packet loss bisected back to:

commit 88d84ac97378c2f1d5fec9af1e8b7d9a662d6b00
Author: Borislav Petkov <bp@suse.de>
Date:   Fri Jul 19 12:28:25 2013 +0200

    EDAC: Fix lockdep splat

I have confirmed that the commit preceding this (v3.11-rc1) is fine and
that 88d84a introduced the bug.

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[BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix Chris Bainbridge <chris.bainbridge@gmail.com> - 2016-03-21 22:50 +0100
  Re: [BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix Borislav Petkov <bp@alien8.de> - 2016-03-22 06:40 +0100
    Re: [BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix Peter Zijlstra <peterz@infradead.org> - 2016-03-22 09:20 +0100
    Re: [BUG] packet loss with PROVE_LOCKING, bisected to EDAC fix Borislav Petkov <bp@alien8.de> - 2016-03-22 12:20 +0100

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