linux-kernel - Re: linux-next: Tree for Feb 4

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Date:	Wed, 4 Feb 2015 23:38:40 +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 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.

- Sedat -

View attachment "3.19.0-rc7-next-20150204.2-iniza-small.patch" of type "text/x-diff" (46812 bytes)