Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-08 Thread Ye Xiaolong
On 09/08, Jens Axboe wrote: >On 09/07/2016 08:04 PM, Ye Xiaolong wrote: >>On 09/08, Fengguang Wu wrote: >>>Hi Jens and Tejun, >>> The command line was in the original email: $ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M And agree, in general it'd be nice if there was

Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-08 Thread Ye Xiaolong
On 09/08, Jens Axboe wrote: >On 09/07/2016 08:04 PM, Ye Xiaolong wrote: >>On 09/08, Fengguang Wu wrote: >>>Hi Jens and Tejun, >>> The command line was in the original email: $ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M And agree, in general it'd be nice if there was

Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-08 Thread Jens Axboe
On 09/07/2016 08:04 PM, Ye Xiaolong wrote: On 09/08, Fengguang Wu wrote: Hi Jens and Tejun, The command line was in the original email: $ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M And agree, in general it'd be nice if there was a link to the image as well, so that folks can

Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-08 Thread Jens Axboe
On 09/07/2016 08:04 PM, Ye Xiaolong wrote: On 09/08, Fengguang Wu wrote: Hi Jens and Tejun, The command line was in the original email: $ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M And agree, in general it'd be nice if there was a link to the image as well, so that folks can

Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Ye Xiaolong
On 09/08, Fengguang Wu wrote: >Hi Jens and Tejun, > >>The command line was in the original email: >> >>$ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M >> >>And agree, in general it'd be nice if there was a link to the image as >>well, so that folks can reproduce. > >Yes we have a reproduce

Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Ye Xiaolong
On 09/08, Fengguang Wu wrote: >Hi Jens and Tejun, > >>The command line was in the original email: >> >>$ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M >> >>And agree, in general it'd be nice if there was a link to the image as >>well, so that folks can reproduce. > >Yes we have a reproduce

Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Fengguang Wu
Hi Jens and Tejun, The command line was in the original email: $ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M And agree, in general it'd be nice if there was a link to the image as well, so that folks can reproduce. Yes we have a reproduce script internally, however need to polish

Re: [LKP] [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Fengguang Wu
Hi Jens and Tejun, The command line was in the original email: $ qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M And agree, in general it'd be nice if there was a link to the image as well, so that folks can reproduce. Yes we have a reproduce script internally, however need to polish

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Jens Axboe
On 09/07/2016 10:41 AM, Tejun Heo wrote: On Thu, Sep 01, 2016 at 06:21:30PM +0800, kernel test robot wrote: FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git wb-buf-throttle commit 8bc4ad9498f81d6689da42457615db0989e720d3 ("writeback:

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Jens Axboe
On 09/07/2016 10:41 AM, Tejun Heo wrote: On Thu, Sep 01, 2016 at 06:21:30PM +0800, kernel test robot wrote: FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git wb-buf-throttle commit 8bc4ad9498f81d6689da42457615db0989e720d3 ("writeback:

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Tejun Heo
On Thu, Sep 01, 2016 at 06:21:30PM +0800, kernel test robot wrote: > > FYI, we noticed the following commit: > > https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git > wb-buf-throttle > commit 8bc4ad9498f81d6689da42457615db0989e720d3 ("writeback: throttle > buffered

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-07 Thread Tejun Heo
On Thu, Sep 01, 2016 at 06:21:30PM +0800, kernel test robot wrote: > > FYI, we noticed the following commit: > > https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git > wb-buf-throttle > commit 8bc4ad9498f81d6689da42457615db0989e720d3 ("writeback: throttle > buffered

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Tejun Heo
Hello, Paul. On Fri, Sep 02, 2016 at 10:00:56AM -0700, Paul E. McKenney wrote: > Note that lockdep believes that the rcu_read_lock() has also been > dropped, otherwise it would have listed it. There isn't any actual code between rcu_read_lock() and the following rcu deref. That's the first

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Tejun Heo
Hello, Paul. On Fri, Sep 02, 2016 at 10:00:56AM -0700, Paul E. McKenney wrote: > Note that lockdep believes that the rcu_read_lock() has also been > dropped, otherwise it would have listed it. There isn't any actual code between rcu_read_lock() and the following rcu deref. That's the first

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Paul E. McKenney
On Fri, Sep 02, 2016 at 09:49:25AM -0600, Jens Axboe wrote: > On 09/02/2016 09:36 AM, Paul E. McKenney wrote: > >On Fri, Sep 02, 2016 at 10:56:22AM -0400, Tejun Heo wrote: > >>(cc'ing Paul, hi!) > >> > >>Hello, > >> > >>On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: > >>>On 09/01/2016

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Paul E. McKenney
On Fri, Sep 02, 2016 at 09:49:25AM -0600, Jens Axboe wrote: > On 09/02/2016 09:36 AM, Paul E. McKenney wrote: > >On Fri, Sep 02, 2016 at 10:56:22AM -0400, Tejun Heo wrote: > >>(cc'ing Paul, hi!) > >> > >>Hello, > >> > >>On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: > >>>On 09/01/2016

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Jens Axboe
On 09/02/2016 09:36 AM, Paul E. McKenney wrote: On Fri, Sep 02, 2016 at 10:56:22AM -0400, Tejun Heo wrote: (cc'ing Paul, hi!) Hello, On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: On 09/01/2016 04:21 AM, kernel test robot wrote: [7.323356] cdrom: Uniform CD-ROM driver

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Jens Axboe
On 09/02/2016 09:36 AM, Paul E. McKenney wrote: On Fri, Sep 02, 2016 at 10:56:22AM -0400, Tejun Heo wrote: (cc'ing Paul, hi!) Hello, On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: On 09/01/2016 04:21 AM, kernel test robot wrote: [7.323356] cdrom: Uniform CD-ROM driver

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Paul E. McKenney
On Fri, Sep 02, 2016 at 10:56:22AM -0400, Tejun Heo wrote: > (cc'ing Paul, hi!) > > Hello, > > On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: > > On 09/01/2016 04:21 AM, kernel test robot wrote: > > > [7.323356] cdrom: Uniform CD-ROM driver Revision: 3.20 > > > [7.334239] >

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Paul E. McKenney
On Fri, Sep 02, 2016 at 10:56:22AM -0400, Tejun Heo wrote: > (cc'ing Paul, hi!) > > Hello, > > On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: > > On 09/01/2016 04:21 AM, kernel test robot wrote: > > > [7.323356] cdrom: Uniform CD-ROM driver Revision: 3.20 > > > [7.334239] >

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Tejun Heo
(cc'ing Paul, hi!) Hello, On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: > On 09/01/2016 04:21 AM, kernel test robot wrote: > > [7.323356] cdrom: Uniform CD-ROM driver Revision: 3.20 > > [7.334239] > > [7.337256] === > > [7.340532] [ INFO:

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-02 Thread Tejun Heo
(cc'ing Paul, hi!) Hello, On Thu, Sep 01, 2016 at 02:13:34PM -0600, Jens Axboe wrote: > On 09/01/2016 04:21 AM, kernel test robot wrote: > > [7.323356] cdrom: Uniform CD-ROM driver Revision: 3.20 > > [7.334239] > > [7.337256] === > > [7.340532] [ INFO:

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-01 Thread Jens Axboe
On 09/01/2016 04:21 AM, kernel test robot wrote: FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git wb-buf-throttle commit 8bc4ad9498f81d6689da42457615db0989e720d3 ("writeback: throttle buffered writeback") in testcase: boot on test

Re: [writeback] 8bc4ad9498: INFO: suspicious RCU usage. ]

2016-09-01 Thread Jens Axboe
On 09/01/2016 04:21 AM, kernel test robot wrote: FYI, we noticed the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git wb-buf-throttle commit 8bc4ad9498f81d6689da42457615db0989e720d3 ("writeback: throttle buffered writeback") in testcase: boot on test