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Message-ID: <20151124144418.GB17033@mtj.duckdns.org>
Date: Tue, 24 Nov 2015 09:44:18 -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, Daniel.
On Tue, Nov 24, 2015 at 11:31:18AM +0100, Daniel Wagner wrote:
> I still see this one with the patch applied:
Yeap, this is a different one.
> [ 19.369455] ------------[ cut here ]------------
> [ 19.369851] WARNING: CPU: 1 PID: 1 at kernel/cgroup_pids.c:97 pids_cancel.constprop.6+0x31/0x40()
> [ 19.370596] Modules linked in:
> [ 19.370916] CPU: 1 PID: 1 Comm: systemd Not tainted 4.4.0-rc1+ #29
> [ 19.371418] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
> [ 19.372542] ffffffff81f65382 ffff88007c043b90 ffffffff81551ffc 0000000000000000
> [ 19.373173] ffff88007c043bc8 ffffffff810de202 ffff88007a752000 ffff88007a29ab00
> [ 19.374144] ffff88007c043c80 ffff88007a1d8400 0000000000000001 ffff88007c043bd8
> [ 19.375185] Call Trace:
> [ 19.375506] [<ffffffff81551ffc>] dump_stack+0x4e/0x82
> [ 19.376238] [<ffffffff810de202>] warn_slowpath_common+0x82/0xc0
> [ 19.376975] [<ffffffff810de2fa>] warn_slowpath_null+0x1a/0x20
> [ 19.377765] [<ffffffff8118e031>] pids_cancel.constprop.6+0x31/0x40
> [ 19.378623] [<ffffffff8118e0fd>] pids_can_attach+0x6d/0xf0
> [ 19.379451] [<ffffffff81188a4c>] cgroup_taskset_migrate+0x6c/0x330
> [ 19.380142] [<ffffffff81188e05>] cgroup_migrate+0xf5/0x190
Can you please describe how to reproduce this one? If you have a qemu
image which reproduces this, I'd be happy to take a look at it.
Thanks.
--
tejun
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