linux-kernel - Re: [4/5] 2.6.21-rc5: known regressions

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Message-ID: <20070328124121.GA23564@elte.hu>
Date:	Wed, 28 Mar 2007 14:41:21 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Thomas Meyer <thomas@...3r.de>,
	Frederic Riss <frederic.riss@...il.com>,
	Marcus Better <marcus@...ter.se>
Subject: Re: [4/5] 2.6.21-rc5: known regressions


* Ingo Molnar <mingo@...e.hu> wrote:

>          entry = get_irq_msi(dev->irq);
>          pos = entry->msi_attrib.pos; <-------- crash on NULL dereference
> 
> 
> i.e. 'entry' is NULL after get_irq_msi(). (i can see the crash only on 
> the VGA screen so no dump of it available. Can write down more info if 
> it's helpful.)
> 
> I have tried Eric's patch above but now i always get a hang after 
> "system 00:00: resuming", already upon the first suspend-resume. Not 
> even the NMI watchdog can get the system out of that hang.

find below the PM log of a successful suspend/resume cycle. (I've marked 
the place that hangs with '[hard hang]')

	Ingo

---------------->
PM: Preparing system for mem sleep
Stopping tasks ... done.
psmouse serio2: suspend
psmouse serio1: suspend
atkbd serio0: suspend
i8042 i8042: suspend
sd 0:0:0:0: suspend
ide 0.0: suspend
serial8250 serial8250: suspend
platform vesafb.0: suspend
pci_express 0000:00:1c.3:pcie03: suspend
pci_express 0000:00:1c.3:pcie02: suspend
pci_express 0000:00:1c.3:pcie00: suspend
pci_express 0000:00:1c.2:pcie03: suspend
pci_express 0000:00:1c.2:pcie02: suspend
pci_express 0000:00:1c.2:pcie00: suspend
pci_express 0000:00:1c.1:pcie03: suspend
pci_express 0000:00:1c.1:pcie02: suspend
pci_express 0000:00:1c.1:pcie00: suspend
pci_express 0000:00:1c.0:pcie03: suspend
pci_express 0000:00:1c.0:pcie02: suspend
pci_express 0000:00:1c.0:pcie00: suspend
platform pcspkr: suspend
pnp 00:0a: suspend
i8042 aux 00:09: suspend
i8042 kbd 00:08: suspend
pnp 00:07: suspend
pnp 00:06: suspend
pnp 00:05: suspend
pnp 00:04: suspend
pnp 00:03: suspend
system 00:02: suspend
pnp 00:01: suspend
system 00:00: suspend
yenta_cardbus 0000:15:00.0: suspend
pci 0000:03:00.0: suspend
e1000 0000:02:00.0: suspend
pci 0000:03:00.0: resuming
yenta_cardbus 0000:15:00.0: resuming
PM: Writing back config space on device 0000:15:00.0 at offset f (was 34001ff, writing 5c0010b)
PM: Writing back config space on device 0000:15:00.0 at offset e (was 0, writing 94fc)
PM: Writing back config space on device 0000:15:00.0 at offset d (was 0, writing 9400)
PM: Writing back config space on device 0000:15:00.0 at offset c (was 0, writing 90fc)
PM: Writing back config space on device 0000:15:00.0 at offset b (was 0, writing 9000)
PM: Writing back config space on device 0000:15:00.0 at offset a (was 0, writing 8bfff000)
PM: Writing back config space on device 0000:15:00.0 at offset 9 (was 0, writing 88000000)
PM: Writing back config space on device 0000:15:00.0 at offset 8 (was 0, writing e3fff000)
PM: Writing back config space on device 0000:15:00.0 at offset 7 (was 0, writing e0000000)
PM: Writing back config space on device 0000:15:00.0 at offset 6 (was 0, writing b0171615)
PM: Writing back config space on device 0000:15:00.0 at offset 4 (was 0, writing e4300000)
PM: Writing back config space on device 0000:15:00.0 at offset 3 (was 20000, writing 2a820)
PM: Writing back config space on device 0000:15:00.0 at offset 1 (was 2100000, writing 2100007)
system 00:00: resuming <-------------- [ hard hang ]
pnp 00:01: resuming
system 00:02: resuming
pnp 00:03: resuming
pnp 00:04: resuming
pnp 00:05: resuming
pnp 00:06: resuming
pnp 00:07: resuming
i8042 kbd 00:08: resuming
i8042 aux 00:09: resuming
pnp 00:0a: resuming
platform pcspkr: resuming
pci_express 0000:00:1c.0:pcie00: resuming
pci_express 0000:00:1c.0:pcie02: resuming
pci_express 0000:00:1c.0:pcie03: resuming
pci_express 0000:00:1c.1:pcie00: resuming
pci_express 0000:00:1c.1:pcie02: resuming
pci_express 0000:00:1c.1:pcie03: resuming
pci_express 0000:00:1c.2:pcie00: resuming
pci_express 0000:00:1c.2:pcie02: resuming
pci_express 0000:00:1c.2:pcie03: resuming
pci_express 0000:00:1c.3:pcie00: resuming
pci_express 0000:00:1c.3:pcie02: resuming
pci_express 0000:00:1c.3:pcie03: resuming
platform vesafb.0: resuming
serial8250 serial8250: resuming
ide 0.0: resuming
sd 0:0:0:0: resuming
i8042 i8042: resuming
atkbd serio0: resuming
psmouse serio1: resuming
ata2: SATA link down (SStatus 0 SControl 0)
ata3: SATA link down (SStatus 0 SControl 0)
ata4: SATA link down (SStatus 0 SControl 0)
psmouse serio2: resuming
ata1: waiting for device to spin up (7 secs)
Restarting tasks ... done.
e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata1.00: configured for UDMA/100
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO or FUA
PM: Preparing system for mem sleep
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