linux-kernel - Re: lock-up with module: Optimize __module

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Message-ID: <559A2FD1.5070901@internode.on.net>
Date:	Mon, 06 Jul 2015 17:05:45 +0930
From:	Arthur Marsh <arthur.marsh@...ernode.on.net>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: lock-up with module: Optimize __module_address() using a latched
 RB-tree



Peter Zijlstra wrote on 06/07/15 16:49:
> On Mon, Jul 06, 2015 at 04:03:45AM +0930, Arthur Marsh wrote:
>> I am happy to supply further details and run further tests.
>
> A .config and gcc version might be a good start. I'll see if 32bit
> userspace in KVM can reproduce.
>

Thanks, details are:

gcc version 5.1.1 20150616 (Debian 5.1.1-11)

(compiled on x86-64 using:
CONCURRENCY_LEVEL=4 DEB_HOST_ARCH=i386 \
MAKEFLAGS="CC=gcc-5 LD=ld.gold KCFLAGS=-march=athlon64" make-kpkg \
--initrd --config menuconfig --arch i386 \
--cross-compile - linux-image

)

.config from a test build near the problem commit attached.

Arthur.

View attachment "config-4.1.0-rc5+" of type "text/plain" (162176 bytes)