From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Josh Boyer <jwboyer-rxtnV0ftBwyoClj4AeEUq9i2O/JbrIOy@public.gmane.org>
Cc: Jeff Moyer <jmoyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
msnitzer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
"Richard W.M. Jones"
<rjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Linux-Kernel@Vger. Kernel. Org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: __blkg_lookup oops with 4.2-rcX
Date: Wed, 2 Sep 2015 11:32:55 -0400 [thread overview]
Message-ID: <20150902153255.GH22326@mtj.duckdns.org> (raw)
In-Reply-To: <20150902145307.GG22326-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
Hello,
On Wed, Sep 02, 2015 at 10:53:07AM -0400, Tejun Heo wrote:
> On Sun, Aug 30, 2015 at 08:30:41AM -0400, Josh Boyer wrote:
> I think the offending commit is 776687bce42b ("block, blk-mq: draining
> can't be skipped even if bypass_depth was non-zero"). It looks like
> the patch makes shutdown path travel data structure which is already
> destroyed. Will post the fix soon.
Hmm... I can't reproduce it here or see how such oops would happen.
* Is the problem reproducible on v4.2? If so, can you please describe
the steps to reproduce? How is cgroup set up?
* Can you please run gdb or addr2line on it and report which line is
causing the oops?
Thanks.
--
tejun
WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Josh Boyer <jwboyer@fedoraproject.org>
Cc: Jeff Moyer <jmoyer@redhat.com>,
msnitzer@redhat.com, "Richard W.M. Jones" <rjones@redhat.com>,
Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
cgroups@vger.kernel.org,
"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>
Subject: Re: __blkg_lookup oops with 4.2-rcX
Date: Wed, 2 Sep 2015 11:32:55 -0400 [thread overview]
Message-ID: <20150902153255.GH22326@mtj.duckdns.org> (raw)
In-Reply-To: <20150902145307.GG22326@mtj.duckdns.org>
Hello,
On Wed, Sep 02, 2015 at 10:53:07AM -0400, Tejun Heo wrote:
> On Sun, Aug 30, 2015 at 08:30:41AM -0400, Josh Boyer wrote:
> I think the offending commit is 776687bce42b ("block, blk-mq: draining
> can't be skipped even if bypass_depth was non-zero"). It looks like
> the patch makes shutdown path travel data structure which is already
> destroyed. Will post the fix soon.
Hmm... I can't reproduce it here or see how such oops would happen.
* Is the problem reproducible on v4.2? If so, can you please describe
the steps to reproduce? How is cgroup set up?
* Can you please run gdb or addr2line on it and report which line is
causing the oops?
Thanks.
--
tejun
next prev parent reply other threads:[~2015-09-02 15:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-30 12:30 __blkg_lookup oops with 4.2-rcX Josh Boyer
2015-08-30 12:30 ` Josh Boyer
2015-08-30 18:04 ` Richard W.M. Jones
2015-09-02 14:53 ` Tejun Heo
[not found] ` <20150902145307.GG22326-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-09-02 15:32 ` Tejun Heo [this message]
2015-09-02 15:32 ` Tejun Heo
2015-09-04 10:46 ` Richard W.M. Jones
[not found] ` <20150904104602.GN29283-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-04 17:13 ` Tejun Heo
2015-09-04 17:13 ` Tejun Heo
[not found] ` <20150904171302.GE25329-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-09-04 18:17 ` Richard W.M. Jones
2015-09-04 18:17 ` Richard W.M. Jones
2015-09-04 20:42 ` Richard W.M. Jones
2015-09-04 20:42 ` Richard W.M. Jones
2015-09-05 15:34 ` Richard W.M. Jones
[not found] ` <20150905153439.GA18461-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-05 15:48 ` Richard W.M. Jones
2015-09-05 15:48 ` Richard W.M. Jones
[not found] ` <20150905154840.GA19460-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-05 18:38 ` Tejun Heo
2015-09-05 18:38 ` Tejun Heo
[not found] ` <20150905183801.GA8231-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-09-05 19:47 ` [PATCH block/for-linus] block: blkg_destroy_all() should clear q->root_blkg and ->root_rl.blkg Tejun Heo
2015-09-05 19:47 ` Tejun Heo
2015-09-06 8:30 ` Richard W.M. Jones
[not found] ` <20150905194736.GB8231-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org>
2015-09-08 15:31 ` Tejun Heo
2015-09-08 15:31 ` Tejun Heo
2015-09-08 15:35 ` Jens Axboe
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