* Re: 3.7 RC1
2012-10-22 23:37 3.7 RC1 K. Y. Srinivasan
@ 2012-10-22 23:33 ` Greg KH
2012-10-22 23:55 ` KY Srinivasan
` (2 more replies)
2012-10-23 5:47 ` Dan Carpenter
1 sibling, 3 replies; 8+ messages in thread
From: Greg KH @ 2012-10-22 23:33 UTC (permalink / raw)
To: K. Y. Srinivasan; +Cc: linux-kernel, devel, olaf, apw, jasowang
On Mon, Oct 22, 2012 at 04:37:45PM -0700, K. Y. Srinivasan wrote:
>
> While testing 3.7 RC1 I discovered that invoking the function orderly_poweroff()
> from an interrupt context will trigger an ASSERT(). This was not the case till
> recently. The comment preceding the orderly_poweroff() function claims that this
> function can be invoked from any context and in the current Hyper-V util driver,
> we support host-driven orderly shut down of the guest by invoking this
> orderly_poweroff() function in the context of the message callback. This code has
> been working for a very long time and it is broken now. Is my assumption that
> orderly_poweroff() could be invoked from the interrupt context a wrong assumption?
Can you check 3.7-rc2? If that also fails, care to do a 'git bisect'
from 3.6 to 3.7-rc1 to find the problem patch?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 8+ messages in thread
* 3.7 RC1
@ 2012-10-22 23:37 K. Y. Srinivasan
2012-10-22 23:33 ` Greg KH
2012-10-23 5:47 ` Dan Carpenter
0 siblings, 2 replies; 8+ messages in thread
From: K. Y. Srinivasan @ 2012-10-22 23:37 UTC (permalink / raw)
To: gregkh, linux-kernel, devel, olaf, apw, jasowang
While testing 3.7 RC1 I discovered that invoking the function orderly_poweroff()
from an interrupt context will trigger an ASSERT(). This was not the case till
recently. The comment preceding the orderly_poweroff() function claims that this
function can be invoked from any context and in the current Hyper-V util driver,
we support host-driven orderly shut down of the guest by invoking this
orderly_poweroff() function in the context of the message callback. This code has
been working for a very long time and it is broken now. Is my assumption that
orderly_poweroff() could be invoked from the interrupt context a wrong assumption?
Regards,
K. Y
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: 3.7 RC1
2012-10-22 23:33 ` Greg KH
@ 2012-10-22 23:55 ` KY Srinivasan
2012-10-23 18:45 ` KY Srinivasan
2012-10-25 13:50 ` KY Srinivasan
2 siblings, 0 replies; 8+ messages in thread
From: KY Srinivasan @ 2012-10-22 23:55 UTC (permalink / raw)
To: Greg KH; +Cc: linux-kernel, devel, olaf, apw, jasowang
Will do and I will report back.
K. Y
> -----Original Message-----
> From: Greg KH [mailto:gregkh@linuxfoundation.org]
> Sent: Monday, October 22, 2012 7:34 PM
> To: KY Srinivasan
> Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com
> Subject: Re: 3.7 RC1
>
> On Mon, Oct 22, 2012 at 04:37:45PM -0700, K. Y. Srinivasan wrote:
> >
> > While testing 3.7 RC1 I discovered that invoking the function
> orderly_poweroff()
> > from an interrupt context will trigger an ASSERT(). This was not the case till
> > recently. The comment preceding the orderly_poweroff() function claims that
> this
> > function can be invoked from any context and in the current Hyper-V util driver,
> > we support host-driven orderly shut down of the guest by invoking this
> > orderly_poweroff() function in the context of the message callback. This code
> has
> > been working for a very long time and it is broken now. Is my assumption that
> > orderly_poweroff() could be invoked from the interrupt context a wrong
> assumption?
>
> Can you check 3.7-rc2? If that also fails, care to do a 'git bisect'
> from 3.6 to 3.7-rc1 to find the problem patch?
>
> thanks,
>
> greg k-h
>
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 3.7 RC1
2012-10-22 23:37 3.7 RC1 K. Y. Srinivasan
2012-10-22 23:33 ` Greg KH
@ 2012-10-23 5:47 ` Dan Carpenter
2012-10-23 14:24 ` KY Srinivasan
1 sibling, 1 reply; 8+ messages in thread
From: Dan Carpenter @ 2012-10-23 5:47 UTC (permalink / raw)
To: K. Y. Srinivasan; +Cc: gregkh, linux-kernel, devel, olaf, apw, jasowang
On Mon, Oct 22, 2012 at 04:37:45PM -0700, K. Y. Srinivasan wrote:
>
> While testing 3.7 RC1 I discovered that invoking the function orderly_poweroff()
> from an interrupt context will trigger an ASSERT(). This was not the case till
> recently. The comment preceding the orderly_poweroff() function claims that this
> function can be invoked from any context and in the current Hyper-V util driver,
> we support host-driven orderly shut down of the guest by invoking this
> orderly_poweroff() function in the context of the message callback. This code has
> been working for a very long time and it is broken now. Is my assumption that
> orderly_poweroff() could be invoked from the interrupt context a wrong assumption?
You can't call orderly_poweroff() from interrupt context.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: 3.7 RC1
2012-10-23 5:47 ` Dan Carpenter
@ 2012-10-23 14:24 ` KY Srinivasan
2012-10-24 6:41 ` Dan Carpenter
0 siblings, 1 reply; 8+ messages in thread
From: KY Srinivasan @ 2012-10-23 14:24 UTC (permalink / raw)
To: Dan Carpenter; +Cc: gregkh, linux-kernel, devel, olaf, apw, jasowang
> -----Original Message-----
> From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> Sent: Tuesday, October 23, 2012 1:47 AM
> To: KY Srinivasan
> Cc: gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> jasowang@redhat.com
> Subject: Re: 3.7 RC1
>
> On Mon, Oct 22, 2012 at 04:37:45PM -0700, K. Y. Srinivasan wrote:
> >
> > While testing 3.7 RC1 I discovered that invoking the function
> orderly_poweroff()
> > from an interrupt context will trigger an ASSERT(). This was not the case till
> > recently. The comment preceding the orderly_poweroff() function claims that
> this
> > function can be invoked from any context and in the current Hyper-V util driver,
> > we support host-driven orderly shut down of the guest by invoking this
> > orderly_poweroff() function in the context of the message callback. This code
> has
> > been working for a very long time and it is broken now. Is my assumption that
> > orderly_poweroff() could be invoked from the interrupt context a wrong
> assumption?
>
> You can't call orderly_poweroff() from interrupt context.
Thanks Dan; I am curious to understand the basis for your assertion.
As I noted earlier the documentation for this function clearly says it can
be called from any context. Furthermore, __orderly_poweroff(), the helper
function allocates memory with the GFP_ATOMIC flag set. Lastly, the behavior
of orderly_poweroff() has been such that this function could be called from interrupt context
for a very long time and something has changed now. For what it is worth, there are other users in
the kernel (in 3.7 RC1) that are invoking the orderly_poweroff() function from interrupt
context other than the Hyper-V shutdown handler: fsl_hv_shutdown_isr() in drivers/virt/fsl_hypervisor.c.
I suspect there are other users as well that have made this similar assumption.
Regards,
K. Y
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: 3.7 RC1
2012-10-22 23:33 ` Greg KH
2012-10-22 23:55 ` KY Srinivasan
@ 2012-10-23 18:45 ` KY Srinivasan
2012-10-25 13:50 ` KY Srinivasan
2 siblings, 0 replies; 8+ messages in thread
From: KY Srinivasan @ 2012-10-23 18:45 UTC (permalink / raw)
To: Greg KH; +Cc: linux-kernel, devel, olaf, apw, jasowang
> -----Original Message-----
> From: Greg KH [mailto:gregkh@linuxfoundation.org]
> Sent: Monday, October 22, 2012 7:34 PM
> To: KY Srinivasan
> Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com
> Subject: Re: 3.7 RC1
>
> On Mon, Oct 22, 2012 at 04:37:45PM -0700, K. Y. Srinivasan wrote:
> >
> > While testing 3.7 RC1 I discovered that invoking the function
> orderly_poweroff()
> > from an interrupt context will trigger an ASSERT(). This was not the case till
> > recently. The comment preceding the orderly_poweroff() function claims that
> this
> > function can be invoked from any context and in the current Hyper-V util driver,
> > we support host-driven orderly shut down of the guest by invoking this
> > orderly_poweroff() function in the context of the message callback. This code
> has
> > been working for a very long time and it is broken now. Is my assumption that
> > orderly_poweroff() could be invoked from the interrupt context a wrong
> assumption?
>
> Can you check 3.7-rc2? If that also fails, care to do a 'git bisect'
> from 3.6 to 3.7-rc1 to find the problem patch?
Looks like this problem is fixed in rc2.
Regards,
K. Y
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 3.7 RC1
2012-10-23 14:24 ` KY Srinivasan
@ 2012-10-24 6:41 ` Dan Carpenter
0 siblings, 0 replies; 8+ messages in thread
From: Dan Carpenter @ 2012-10-24 6:41 UTC (permalink / raw)
To: KY Srinivasan; +Cc: gregkh, linux-kernel, devel, olaf, apw, jasowang
On Tue, Oct 23, 2012 at 02:24:58PM +0000, KY Srinivasan wrote:
>
>
> > -----Original Message-----
> > From: Dan Carpenter [mailto:dan.carpenter@oracle.com]
> > Sent: Tuesday, October 23, 2012 1:47 AM
> > To: KY Srinivasan
> > Cc: gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org;
> > devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> > jasowang@redhat.com
> > Subject: Re: 3.7 RC1
> >
> > On Mon, Oct 22, 2012 at 04:37:45PM -0700, K. Y. Srinivasan wrote:
> > >
> > > While testing 3.7 RC1 I discovered that invoking the function
> > orderly_poweroff()
> > > from an interrupt context will trigger an ASSERT(). This was not the case till
> > > recently. The comment preceding the orderly_poweroff() function claims that
> > this
> > > function can be invoked from any context and in the current Hyper-V util driver,
> > > we support host-driven orderly shut down of the guest by invoking this
> > > orderly_poweroff() function in the context of the message callback. This code
> > has
> > > been working for a very long time and it is broken now. Is my assumption that
> > > orderly_poweroff() could be invoked from the interrupt context a wrong
> > assumption?
> >
> > You can't call orderly_poweroff() from interrupt context.
>
> Thanks Dan; I am curious to understand the basis for your assertion.
> As I noted earlier the documentation for this function clearly says it can
> be called from any context. Furthermore, __orderly_poweroff(), the helper
> function allocates memory with the GFP_ATOMIC flag set. Lastly, the behavior
> of orderly_poweroff() has been such that this function could be called from interrupt context
> for a very long time and something has changed now. For what it is worth, there are other users in
> the kernel (in 3.7 RC1) that are invoking the orderly_poweroff() function from interrupt
> context other than the Hyper-V shutdown handler: fsl_hv_shutdown_isr() in drivers/virt/fsl_hypervisor.c.
> I suspect there are other users as well that have made this similar assumption.
>
Aw crap. I was wrong. Sorry about that.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 8+ messages in thread
* RE: 3.7 RC1
2012-10-22 23:33 ` Greg KH
2012-10-22 23:55 ` KY Srinivasan
2012-10-23 18:45 ` KY Srinivasan
@ 2012-10-25 13:50 ` KY Srinivasan
2 siblings, 0 replies; 8+ messages in thread
From: KY Srinivasan @ 2012-10-25 13:50 UTC (permalink / raw)
To: Greg KH; +Cc: linux-kernel, devel, olaf, apw, jasowang
> -----Original Message-----
> From: Greg KH [mailto:gregkh@linuxfoundation.org]
> Sent: Monday, October 22, 2012 7:34 PM
> To: KY Srinivasan
> Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com
> Subject: Re: 3.7 RC1
>
> On Mon, Oct 22, 2012 at 04:37:45PM -0700, K. Y. Srinivasan wrote:
> >
> > While testing 3.7 RC1 I discovered that invoking the function
> orderly_poweroff()
> > from an interrupt context will trigger an ASSERT(). This was not the case till
> > recently. The comment preceding the orderly_poweroff() function claims that
> this
> > function can be invoked from any context and in the current Hyper-V util driver,
> > we support host-driven orderly shut down of the guest by invoking this
> > orderly_poweroff() function in the context of the message callback. This code
> has
> > been working for a very long time and it is broken now. Is my assumption that
> > orderly_poweroff() could be invoked from the interrupt context a wrong
> assumption?
>
> Can you check 3.7-rc2? If that also fails, care to do a 'git bisect'
> from 3.6 to 3.7-rc1 to find the problem patch?
The problem still persists in 3.7-rc2. Sorry for the false positive; we had a script problem
that indicated that the problem had gone away. Manual testing has shown that the problem
persists. We will investigate it further.
Regards,
K. Y
>
> thanks,
>
> greg k-h
>
>
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2012-10-25 13:51 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-10-22 23:37 3.7 RC1 K. Y. Srinivasan
2012-10-22 23:33 ` Greg KH
2012-10-22 23:55 ` KY Srinivasan
2012-10-23 18:45 ` KY Srinivasan
2012-10-25 13:50 ` KY Srinivasan
2012-10-23 5:47 ` Dan Carpenter
2012-10-23 14:24 ` KY Srinivasan
2012-10-24 6:41 ` Dan Carpenter
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