Re: Hard freeze / interrupt-related death / instability

[Elias Oltmanns <eo@nebensachen.de>]

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Hi there,

Thomas Renninger <trenn@suse.de> wrote:
> Hi,
>
> I expect this is more a ata/ahci or chipset problem (this is ICH7,
> right?), maybe ide list has an idea or has seen something similar
> already?
[...]
> On Tue, 2008-04-08 at 15:27 +0200, Peter Gervai wrote:
[...]
>> Kernel: vanilla, released 2.6.24.* (right now .2, doesn't seem to matter)
>> Hw: board Intel D945PVS, cpu Intel(R) Pentium(R) D CPU 3.00GHz (Type 0, Family
>> 15, Model 6, Stepping 2), ram 2G, 2 SATA HDD (AHCI), 1 IDE HDD, 1 DVDROM, usb
>> mouse, onboard e1000 eth, onboard intel HDA sound, NVidia 8400 GS, madwifi
>> driven pci card.
[...]
>> 
>> The machine started to "freeze" daily/2-3 daily, somwehere around the
>> upgrade to 2.6.24
[...]
>> 
>> The freeze occurs under Xwindow and usually goes the way that mouse became
>> _extremely_ jerky, cpu load goes up and usege on both cores top 100%, often the
>> hdd led stays lit. (That's why I started to blame sata/disks first.)
>> 
>> While the mouse works (kind of), the system isn't usable, and dies instantly
>> (hard freeze) if I try to switch to console (by any means, including UnRaw/SAK
>> sysrq combinations).

I wonder whether this could be related to an issue I brought up several
weeks ago. See [1] for a summary of the thread.

If you're alright with patching and compiling, you might give the
following patch a try.

Hope that helps,

Elias

[1] <http://permalink.gmane.org/gmane.linux.ide/28348>


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---

 drivers/ata/libata-scsi.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index df25aa4..5bc33a0 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -823,7 +823,7 @@ static void ata_scsi_sdev_config(struct scsi_device *sdev)
 	 * prevent SCSI midlayer from automatically deferring
 	 * requests.
 	 */
-	sdev->max_device_blocked = 1;
+	sdev->max_device_blocked = 2;
 }
 
 static void ata_scsi_dev_config(struct scsi_device *sdev,
@@ -3204,7 +3204,7 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
 		 * Set host_blocked to 1 to prevent SCSI midlayer from
 		 * automatically deferring requests.
 		 */
-		shost->max_host_blocked = 1;
+		shost->max_host_blocked = 2;
 
 		rc = scsi_add_host(ap->scsi_host, ap->host->dev);
 		if (rc)