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

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Date:	Wed, 15 May 2013 10:01:22 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pm@...r.kernel.org, Len Brown <len.brown@...el.com>,
	Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 3.10-rc1 system starts regular boot when waking from s2ram

On Tue 14-05-13 22:09:34, Rafael J. Wysocki wrote:
> On Tuesday, May 14, 2013 06:01:08 PM Michal Hocko wrote:
> > Hi,
> > I am not able to make my system wake up from s2ram with 3.10-rc1. The
> > system simply starts booting as if it wasn't suspended. 3.9 works
> > without any issues.
> > 
> > pm_test testing (with no_console_suspend) shows that platform is the
> > last mode which wakes up normally. processors mode already starts with a
> > regular boot. The log doesn't say anything interesting:
> > 
> > $ echo processors > /sys/power/pm_test
> > $ echo mem > /sys/power/state
> > [   61.012533] PM: Syncing filesystems ... done.
> > [   61.017944] Freezing user space processes ... (elapsed 0.01 seconds) done.
> > [   61.033050] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
> > [   61.081647] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> > [   61.081724] sd 0:0:0:0: [sda] Stopping disk
> > 
> > then it waits for 5s as expected and starts booting from scratch without
> > anything in the log.
> > 
> > Same test with
> > $ 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...

> Anyway, the general PM changes essentially are not so invasive as to cause
> something like this to happen, so I'm kind of suspecting x86.
> 
> Thanks,
> Rafael
> 
> 
> -- 
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.

-- 
Michal Hocko
SUSE Labs
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