From: Omar Sandoval <osandov@osandov.com>
To: Fengguang Wu <fengguang.wu@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-block <linux-block@vger.kernel.org>,
Omar Sandoval <osandov@fb.com>, Jens Axboe <axboe@fb.com>,
LKP <lkp@01.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc
Date: Tue, 28 Feb 2017 00:52:15 -0800 [thread overview]
Message-ID: <20170228085215.GA3231@vader> (raw)
In-Reply-To: <20170228083508.fgcncfhksclb2dei@wfg-t540p.sh.intel.com>
On Tue, Feb 28, 2017 at 04:35:08PM +0800, Fengguang Wu wrote:
> On Tue, Feb 28, 2017 at 09:17:11AM +0100, Peter Zijlstra wrote:
> > On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote:
> > > Hello,
> > >
> > > FYI, an old blk_mq bug triggers new warnings on this commit. It's very
> > > reproducible and you may try the attached reproduce-* script.
> >
> > > [ 4.447772] kobject (ffff88001c041f10): tried to init an initialized object, something is seriously wrong.
> > > [ 4.453395] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-01216-g29dee3c #2
> > > [ 4.455534] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> > > [ 4.458252] Workqueue: events_unbound async_run_entry_fn
> > > [ 4.459708] Call Trace:
> > > [ 4.460611] dump_stack+0x19/0x27
> > > [ 4.461652] kobject_init+0xda/0xf0
> > > [ 4.462731] blk_mq_register_dev+0x31/0x150
> > > [ 4.463990] blk_register_queue+0x205/0x250
> > > [ 4.465217] device_add_disk+0x1ab/0x710
> > > [ 4.466384] sd_probe_async+0x11c/0x1e0
> > > [ 4.467544] async_run_entry_fn+0xbd/0x220
> > > [ 4.468760] process_one_work+0x4a7/0x990
> > > [ 4.469938] ? process_one_work+0x348/0x990
> > > [ 4.471168] worker_thread+0x342/0x8a0
> > > [ 4.472300] ? process_one_work+0x990/0x990
> > > [ 4.473540] kthread+0x188/0x190
> > > [ 4.474557] ? kthread_create_on_node+0x40/0x40
> > > [ 4.475850] ret_from_fork+0x31/0x40
> >
> > So this was pre-existing wreckage? If so, that needs to be sorted first.
> > Because if the kobject stuff is broken, there's no way the refcount
> > stuff can begin to work.
>
> Yeah it's old bug that should have existed for quite some time.
> It's not quite related to the refcount work, just hoping the new
> warning might serve as new clues to help debugging the blk_mq bug.
>
> Thanks,
> Fengguang
Ming Lei posted a series to fix this here [1]. I haven't gotten around
to testing it, but it'd be great if you could try it, too.
http://marc.info/?l=linux-block&m=148775846217069&w=2
WARNING: multiple messages have this Message-ID (diff)
From: Omar Sandoval <osandov@osandov.com>
To: lkp@lists.01.org
Subject: Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc
Date: Tue, 28 Feb 2017 00:52:15 -0800 [thread overview]
Message-ID: <20170228085215.GA3231@vader> (raw)
In-Reply-To: <20170228083508.fgcncfhksclb2dei@wfg-t540p.sh.intel.com>
[-- Attachment #1: Type: text/plain, Size: 2129 bytes --]
On Tue, Feb 28, 2017 at 04:35:08PM +0800, Fengguang Wu wrote:
> On Tue, Feb 28, 2017 at 09:17:11AM +0100, Peter Zijlstra wrote:
> > On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote:
> > > Hello,
> > >
> > > FYI, an old blk_mq bug triggers new warnings on this commit. It's very
> > > reproducible and you may try the attached reproduce-* script.
> >
> > > [ 4.447772] kobject (ffff88001c041f10): tried to init an initialized object, something is seriously wrong.
> > > [ 4.453395] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-01216-g29dee3c #2
> > > [ 4.455534] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> > > [ 4.458252] Workqueue: events_unbound async_run_entry_fn
> > > [ 4.459708] Call Trace:
> > > [ 4.460611] dump_stack+0x19/0x27
> > > [ 4.461652] kobject_init+0xda/0xf0
> > > [ 4.462731] blk_mq_register_dev+0x31/0x150
> > > [ 4.463990] blk_register_queue+0x205/0x250
> > > [ 4.465217] device_add_disk+0x1ab/0x710
> > > [ 4.466384] sd_probe_async+0x11c/0x1e0
> > > [ 4.467544] async_run_entry_fn+0xbd/0x220
> > > [ 4.468760] process_one_work+0x4a7/0x990
> > > [ 4.469938] ? process_one_work+0x348/0x990
> > > [ 4.471168] worker_thread+0x342/0x8a0
> > > [ 4.472300] ? process_one_work+0x990/0x990
> > > [ 4.473540] kthread+0x188/0x190
> > > [ 4.474557] ? kthread_create_on_node+0x40/0x40
> > > [ 4.475850] ret_from_fork+0x31/0x40
> >
> > So this was pre-existing wreckage? If so, that needs to be sorted first.
> > Because if the kobject stuff is broken, there's no way the refcount
> > stuff can begin to work.
>
> Yeah it's old bug that should have existed for quite some time.
> It's not quite related to the refcount work, just hoping the new
> warning might serve as new clues to help debugging the blk_mq bug.
>
> Thanks,
> Fengguang
Ming Lei posted a series to fix this here [1]. I haven't gotten around
to testing it, but it'd be great if you could try it, too.
http://marc.info/?l=linux-block&m=148775846217069&w=2
next prev parent reply other threads:[~2017-02-28 9:02 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-28 4:11 [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc Fengguang Wu
2017-02-28 7:48 ` Peter Zijlstra
2017-02-28 7:48 ` Peter Zijlstra
2017-02-28 8:17 ` Peter Zijlstra
2017-02-28 8:17 ` Peter Zijlstra
2017-02-28 8:35 ` Fengguang Wu
2017-02-28 8:35 ` Fengguang Wu
2017-02-28 8:52 ` Omar Sandoval [this message]
2017-02-28 8:52 ` Omar Sandoval
2017-02-28 8:38 ` Peter Zijlstra
2017-02-28 8:38 ` Peter Zijlstra
2017-02-28 9:45 ` Peter Zijlstra
2017-02-28 9:45 ` Peter Zijlstra
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