Message-ID: <CA+icZUWXGiRL7r0+TmQGiFhb4tB-YBZxo-AB0iwkXug=_mLZow@mail.gmail.com>
Date:	Thu, 5 Feb 2015 00:54:29 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Kristen Carlson Accardi <kristen@...ux.intel.com>
Subject: Re: linux-next: Tree for Feb 4

On Thu, Feb 5, 2015 at 12:25 AM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Wednesday, February 04, 2015 11:38:40 PM Sedat Dilek wrote:
>> On Wed, Feb 4, 2015 at 10:54 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> > On Wednesday, February 04, 2015 09:18:03 PM Sedat Dilek wrote:
>> >> On Wed, Feb 4, 2015 at 9:35 AM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>> >> > Hi all,
>> >> >
>> >> > The next release I will be making will be next-20150209 - which will
>> >> > probably be after the v3.19 release.
>> >> >
>> >> > Changes since 20150203:
>> >> >
>> >> > The sound-asoc tree gained a conflict against the sound tree.
>> >> >
>> >> > The scsi tree gained a build failure caused by an interaction with the
>> >> > driver-core tree.  I applied a merge fix patch.
>> >> >
>> >> > The akpm-current tree gained a build failure for which I disabled
>> >> > CONFIG_KASAN.
>> >> >
>> >> > Non-merge commits (relative to Linus' tree): 7461
>> >> >  7314 files changed, 309736 insertions(+), 172363 deletions(-)
>> >> >
>> >> > ----------------------------------------------------------------------------
>> >> >
>> >>
>> >> [ CC linux-rcu | linux-pm | intel_pstate maintainers ]
>> >
>> > Dirk is not the maintainer of intel_pstate any more, CC: Kristen.
>> >
>>
>> Yupp, I forwarded my original posting before you answered me.
>>
>> >> Hi,
>> >>
>> >> after suspend-and-resume I see the following call-trace:
>> >
>> > Do you see that after CPU1 offline too?
>> >
>>
>> Did not check yet.
>>
>> >> ...
>> >> [ 1144.482666] Disabling non-boot CPUs ...
>> >> [ 1144.483000] intel_pstate CPU 1 exiting
>> >> [ 1144.486064]
>> >> [ 1144.486065] ===============================
>> >> [ 1144.486067] smpboot: CPU 1 didn't die...
>> >> [ 1144.486067] [ INFO: suspicious RCU usage. ]
>> >> [ 1144.486069] 3.19.0-rc7-next-20150204.1-iniza-small #1 Not tainted
>> >> [ 1144.486070] -------------------------------
>> >> [ 1144.486072] include/trace/events/tlb.h:35 suspicious
>> >> rcu_dereference_check() usage!
>> >> [ 1144.486073]
>> >> [ 1144.486073] other info that might help us debug this:
>> >> [ 1144.486073]
>> >> [ 1144.486074]
>> >> [ 1144.486074] RCU used illegally from offline CPU!
>> >> [ 1144.486074] rcu_scheduler_active = 1, debug_locks = 0
>> >> [ 1144.486076] no locks held by swapper/1/0.
>> >> [ 1144.486076]
>> >> [ 1144.486076] stack backtrace:
>> >> [ 1144.486079] CPU: 1 PID: 0 Comm: swapper/1 Not tainted
>> >> 3.19.0-rc7-next-20150204.1-iniza-small #1
>> >> [ 1144.486080] Hardware name: SAMSUNG ELECTRONICS CO., LTD.
>> >> 530U3BI/530U4BI/530U4BH/530U3BI/530U4BI/530U4BH, BIOS 13XK 03/28/2013
>> >> [ 1144.486085]  0000000000000001 ffff88011a44fe18 ffffffff817e370d
>> >> 0000000000000011
>> >> [ 1144.486088]  ffff88011a448290 ffff88011a44fe48 ffffffff810d6847
>> >> ffff8800c66b9600
>> >> [ 1144.486091]  0000000000000001 ffff88011a44c000 ffffffff81cb3900
>> >> ffff88011a44fe78
>> >> [ 1144.486092] Call Trace:
>> >> [ 1144.486099]  [<ffffffff817e370d>] dump_stack+0x4c/0x65
>> >> [ 1144.486104]  [<ffffffff810d6847>] lockdep_rcu_suspicious+0xe7/0x120
>> >> [ 1144.486109]  [<ffffffff810b71a5>] idle_task_exit+0x205/0x2c0
>> >> [ 1144.486113]  [<ffffffff81054c4e>] play_dead_common+0xe/0x50
>> >> [ 1144.486116]  [<ffffffff81054ca5>] native_play_dead+0x15/0x140
>> >> [ 1144.486121]  [<ffffffff8102963f>] arch_cpu_idle_dead+0xf/0x20
>> >> [ 1144.486123]  [<ffffffff810cd89e>] cpu_startup_entry+0x37e/0x580
>> >> [ 1144.486126]  [<ffffffff81053e20>] start_secondary+0x140/0x150
>> >> [ 1144.502920] intel_pstate CPU 2 exiting
>> >> ...
>> >>
>> >> Not sure if this comes from the rcu or pm/intel_pstate area.
>> >
>> > New intel_pstate commits in linux-next are between 7ab0256e57ae and
>> > a04759924e25 inclusive.  Please check that range first.
>> >
>>
>> Not sure if I am willing to test with reverted patches.
>> ( /me was updating Linux graphic driver stack today built with
>> upcomming llvm-toolchain v3.6.0. )
>>
>> > If that doesn't point you to the offender, you can pull the linux-next
>> > branch of the linux-pm.git tree at:
>> >
>> > git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
>> >
>> > and see if that alone triggers the issue for you.  If not, the offender is
>> > not there.  Otherwise, and if you use the ACPI cpuidle driver, you can
>> > check the acpi-processor merge point too.
>> >
>>
>> I pulled in pm-next-20150204 on top of next-20150204, but that did not help.
>
> What I was asking about was to test linux-pm.git/linux-next *instead* *of* full
> linux-next and not on top of it.  That would tell you whether or not the new trace
> was introduced by one of the PM commits or elsewhere.
>

No, I did not test this.

> But this most likely is what Paul said anyway.
>

Not sure what you mean by this statement.

I tried -3 kernel with...

f64b348810c2 Revert "intel_pstate: Add support for SkyLake"
a0d825a39848 Revert "intel_pstate: expose turbo range to sysfs"
847153608ecf Revert "intel_pstate: Add num_pstates to sysfs"
412a6770cde4 Revert "intel_pstate: respect cpufreq policy request"
e2a6685023ed Revert "intel_pstate: honor user space min_perf_pct
override on resume"

...shows the trace when offlining cpu1 (w/o doing a s/r).

- Sedat -
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