linux-kernel - Re: 3.10-rc1 system starts regular boot when waking from s2ram

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Date:	Wed, 15 May 2013 10:29:47 +0200
From:	Pavel Machek <pavel@....cz>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-pm@...r.kernel.org,
	Len Brown <len.brown@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 3.10-rc1 system starts regular boot when waking from s2ram

Hi!

> > > $ echo platform > /sys/power/pm_test
> > > $ echo mem > /sys/power/state
> > > [   34.960477] PM: Syncing filesystems ... done.
> > > [   34.967624] Freezing user space processes ... (elapsed 0.01 seconds) done.
> > > [   34.983936] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
> > > [   35.056655] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> > > [   35.056800] sd 0:0:0:0: [sda] Stopping disk
> > > [   41.255957] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> > > [   41.316267] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> > > [   41.316354] ata5: SATA link down (SStatus 0 SControl 300)
> > > [   41.316428] ata4: SATA link down (SStatus 0 SControl 300)
> > > [   41.316507] ata6: SATA link down (SStatus 0 SControl 300)
> > > [   41.316958] ata1.00: ACPI cmd 00/00:00:00:00:00:a0 (NOP) rejected by device (Stat=0x51 Err=0x04)
> > > [   41.388315] ata1.00: ACPI cmd 00/00:00:00:00:00:a0 (NOP) rejected by device (Stat=0x51 Err=0x04)
> > > [   41.389142] ata1.00: configured for UDMA/133
> > > [   41.391172] ata2.00: configured for UDMA/100
> > > [   41.396198] sd 0:0:0:0: [sda] Starting disk
> > > [   41.396533] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
> > > [   41.396767] iwlwifi 0000:02:00.0: Radio type=0x0-0x3-0x1
> > > [   41.638698] PM: resume of devices complete after 724.548 msecs
> > > [   41.638835] Restarting tasks ... done.
> > > [   41.640747] video LNXVIDEO:00: Restoring backlight state
> > > [   42.848988] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
> > > [   42.850380] e1000e 0000:00:19.0 eth0: Detected Hardware Unit Hang:
> > > [   42.850380]   TDH                  <0>
> > > [   42.850380]   TDT                  <11>
> > > [   42.850380]   next_to_use          <11>
> > > [   42.850380]   next_to_clean        <0>
> > > [   42.850380] buffer_info[next_to_clean]:
> > > [   42.850380]   time_stamp           <ffff034b>
> > > [   42.850380]   next_to_watch        <0>
> > > [   42.850380]   jiffies              <ffff04d9>
> > > [   42.850380]   next_to_watch.status <0>
> > > [   42.850380] MAC Status             <80000>
> > > [   42.850380] PHY Status             <7949>
> > > [   42.850380] PHY 1000BASE-T Status  <0>
> > > [   42.850380] PHY Extended Status    <3000>
> > > [   42.850380] PCI Status             <10>
> > > [   44.066855] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
> > > 
> > > Is the issue known?
> > 
> > No.
> > 
> > > Can I provide more information to help with debugging this issue.
> > 
> > I'm not sure.
> > 
> > > I am quite busy to bisect this ATM but can do it
> > > if this is the only choice left.
> > 
> > Well, it probably is.  I'll try to reproduce it, but if I can't ...
> 
> OK, I am bisecting now. 6 iterations left...

Do you have any watchdog active? Resume got slower and someone bisected it:

Date: Sat, 11 May 2013 20:04:50 +0200
From: Bj??rn Mork <bjorn@...k.no>
To: "Paul E. McKenney" <paul.mckenney@...aro.org>
Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org
Subject: Bisected post-3.9 regression: Resume takes 5 times as much time as with v3.9
User-Agent: Gnus/5.11002 (No Gnus v0.20) Emacs/23.4 (gnu/linux)

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Hello,

resuming from system suspend is intolerably slow in current mainline. I
am not the most patient person around, and I actually started out
bisecting this believing it was hanging...  Turned out it wasn't really
hanging.  It just took 15 seconds to wake up from suspend-to-ram.
Timing v3.9 I found that it used less than 3 seconds on this ancient
laptop I'm using.

Bisecting it ended up pointing to

commit c0f4dfd4f90f1667d234d21f15153ea09a2eaa66

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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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