From: Kimberly Brown <kimbrownkd@gmail.com>
To: Sasha Levin <sashal@kernel.org>
Cc: Dexuan Cui <decui@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Long Li <longli@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
KY Srinivasan <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Drivers: hv: vmbus: Add mutex lock to channel show functions
Date: Thu, 14 Feb 2019 21:27:47 -0500 [thread overview]
Message-ID: <20190215022747.GA53910@ubu-Virtual-Machine> (raw)
In-Reply-To: <20190215015431.GK69686@sasha-vm>
On Thu, Feb 14, 2019 at 08:54:31PM -0500, Sasha Levin wrote:
> On Sat, Feb 02, 2019 at 03:07:35PM -0500, Kimberly Brown wrote:
> > On Fri, Feb 01, 2019 at 06:24:24PM +0000, Dexuan Cui wrote:
> > > > From: Kimberly Brown <kimbrownkd@gmail.com>
> > > > Sent: Thursday, January 31, 2019 9:47 AM
> > > > ...
> > > > 2) Prevent a deadlock that can occur between the proposed mutex_lock()
> > > > call in the vmbus_chan_attr_show() function and the sysfs/kernfs functions.
> > > Hi Kim,
> > > Can you please share more details about the deadlock?
> > > It's unclear to me how the deadlock happens.
> > >
> >
> > Hi Dexuan,
> >
> > I encountered the deadlock by:
> > 1) Adding a call to msleep() before acquiring the mutex in
> > vmbus_chan_attr_show()
> > 2) Opening a hv_netvsc subchannel's sysfs file
> > 3) Removing hv_netvsc while the sysfs file is opening
>
> Dexuan, any objections to pulling this fix in?
>
Hi Sasha,
This fix can cause a deadlock. I'm working on a different fix for the
original race condition problem.
Thanks,
Kim
> --
> Thanks,
> Sasha
next prev parent reply other threads:[~2019-02-15 2:27 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-22 2:07 [PATCH] Drivers: hv: vmbus: Add mutex lock to channel show functions Kimberly Brown
2019-01-22 3:46 ` Dexuan Cui
2019-01-22 6:42 ` Kimberly Brown
2019-01-22 18:40 ` Dexuan Cui
2019-01-28 19:58 ` Kimberly Brown
2019-01-29 19:20 ` Dexuan Cui
2019-01-31 15:19 ` Sasha Levin
2019-01-31 16:45 ` Michael Kelley
2019-01-31 17:47 ` Kimberly Brown
2019-02-01 14:13 ` Sasha Levin
2019-02-01 18:24 ` Dexuan Cui
2019-02-02 20:07 ` Kimberly Brown
2019-02-15 1:54 ` Sasha Levin
2019-02-15 2:27 ` Kimberly Brown [this message]
2019-02-22 3:46 ` [PATCH v2 0/2] Fix a race condition vulnerability in "_show" functions Kimberly Brown
2019-02-22 3:47 ` [PATCH v2 1/2] Drivers: hv: vmbus: Refactor chan->state if statement Kimberly Brown
2019-02-24 16:54 ` Michael Kelley
2019-02-22 3:47 ` [PATCH v2 2/2] Drivers: hv: vmbus: Add a channel ring buffer mutex lock Kimberly Brown
2019-02-24 16:53 ` Michael Kelley
2019-02-26 6:24 ` Kimberly Brown
2019-03-14 20:04 ` [PATCH v3 0/3] Drivers: hv: vmbus: Fix a race condition in "_show" functions Kimberly Brown
2019-03-14 20:05 ` [PATCH v3 1/3] Drivers: hv: vmbus: Refactor chan->state if statement Kimberly Brown
2019-03-14 20:05 ` [PATCH v3 2/3] Drivers: hv: vmbus: Set ring_info field to 0 and remove memset Kimberly Brown
2019-03-29 16:01 ` Michael Kelley
2019-03-14 20:05 ` [PATCH v3 3/3] Drivers: hv: vmbus: Fix race condition with new ring_buffer_info mutex Kimberly Brown
2019-03-14 22:45 ` Stephen Hemminger
2019-03-17 1:49 ` Kimberly Brown
2019-03-20 20:06 ` Stephen Hemminger
2019-03-21 3:47 ` Kimberly Brown
2019-03-21 16:04 ` Michael Kelley
2019-03-28 4:30 ` Kimberly Brown
2019-03-28 18:42 ` Stephen Hemminger
2019-03-29 16:04 ` Michael Kelley
2019-04-10 22:59 ` [PATCH v3 0/3] Drivers: hv: vmbus: Fix a race condition in "_show" functions Sasha Levin
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