From: "Serge E. Hallyn" <serge.hallyn@ubuntu.com>
To: Tejun Heo <tj@kernel.org>
Cc: Jeremiah Mahler <jmmahler@gmail.com>,
cgroups@vger.kernel.org, Serge Hallyn <serge.hallyn@ubuntu.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
linux-kernel@vger.kernel.org,
Dan Williams <dan.j.williams@intel.com>
Subject: Re: cgroup: BUG: unable to handle kernel NULL pointer dereference
Date: Sat, 2 Jan 2016 12:24:16 -0600 [thread overview]
Message-ID: <20160102182416.GA3957@mail.hallyn.com> (raw)
In-Reply-To: <20160102115437.GE3660@htj.duckdns.org>
On Sat, Jan 02, 2016 at 06:54:37AM -0500, Tejun Heo wrote:
> On Fri, Jan 01, 2016 at 03:40:28PM -0800, Jeremiah Mahler wrote:
> > all,
> >
> > When running the latest linux-next (20151231) two of my machines
> > hang early in the boot sequence. The initial message is for a
> > NULL pointer dereference.
> >
> > BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
> >
> > And the RIP line refers to cgroup_path.
> >
> > RIP [<ffffffff810eb178>] cgroup_path+0x30/0x80
> >
> > Attached are pictures of the back trace.
> >
> > Let me know if I can do anything else to help. I will investigate the
> > problem further if I get a chance.
>
> This is most likely from the recent changes from cgroup ns support.
> Reverted the patchset for now as it also introduced a bisectability
> issue. Serge, can you please look into this one?
Tried to reproduce with setting CONFIG_CFQ_GROUP_IOSCHED=y, but did not
succeed. Could you send me the .config? Also, if someone could send
the objdump -d output that might help. Though really, it seems clear
that current->nsproxy must be NULL. Hm, that's right - we used to have
that issue in pidns (or was it netns) during process exit. I don't know
that I'll get time this afternoon, but I'll look into it asap.
thanks.
next prev parent reply other threads:[~2016-01-02 18:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160101234028.GA1750@hudson.localdomain>
2016-01-02 11:54 ` cgroup: BUG: unable to handle kernel NULL pointer dereference Tejun Heo
2016-01-02 18:24 ` Serge E. Hallyn [this message]
2016-01-02 21:50 ` Jeremiah Mahler
2016-01-03 0:59 ` Serge E. Hallyn
2016-01-03 3:41 ` Serge E. Hallyn
2016-01-04 19:15 ` Serge E. Hallyn
2016-01-04 19:17 ` Tejun Heo
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