linux-kernel - Re: [PATCH cgroup/for-4.4-fixes] cgroup: make css

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Message-ID: <20151124145945.GF17033@mtj.duckdns.org>
Date:	Tue, 24 Nov 2015 09:59:45 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Daniel Wagner <daniel.wagner@...-carit.de>
Cc:	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, Dave Jones <davej@...emonkey.org.uk>,
	kernel-team@...com
Subject: Re: [PATCH cgroup/for-4.4-fixes] cgroup: make css_set pin its css's
 to avoid use-afer-free

Hello,

On Tue, Nov 24, 2015 at 03:58:42PM +0100, Daniel Wagner wrote:
> I start a not so updated rawhide image with some funky kernel options.
> They are more less some left overs from debugging:
> 
> $QEMU -gdb tcp::1235 -enable-kvm -machine accel=kvm \
>       -m 2G -cpu Haswell \
>       -smp sockets=1,cores=2,threads=2 \
>       -hda ~/vm-images/rawhide-big.qcow2\
>       -net nic,model=virtio \
>       -net user,hostfwd=tcp::7777-:22 \
>       -monitor telnet:127.0.0.1:1234,server,nowait \
>       -serial stdio -display none \
>       -append "root=/dev/sda1 console=ttyS0 audit=0 isolcpus=3 systemd.unified_cgroup_hierarchy=1" \
>       -kernel arch/x86_64/boot/bzImage $@
> 
> After starting the image I just wait for a few seconds and I'll get it.
> No interaction needed.
> 
> > If you have a qemu image which reproduces this, I'd be happy to take
> > a look at it.
> 
> I'll upload it, though it will take a while... the fun of living
> with asymmetric connectivity.

Great, thanks a lot!

-- 
tejun
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