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Re: Dom0 crashing when built with c/s 881 (Was: [Xen-devel] blktap2: ne

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Dulloor <dulloor@xxxxxxxxx>, Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Subject: Re: Dom0 crashing when built with c/s 881 (Was: [Xen-devel] blktap2: need more than 3 values to unpack)
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Wed, 03 Jun 2009 21:46:57 +0100
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Thread-topic: Dom0 crashing when built with c/s 881 (Was: [Xen-devel] blktap2: need more than 3 values to unpack)
User-agent: Microsoft-Entourage/12.17.0.090302
Changeset 881 is "pcie io space multiplex: backport of bus event
notification patch", right? I don't believe that you are reverting just that
patch, for two reasons:
 1. It only adds extra functionality which by default would not do anything.
Just reading the patch I can see it's harmless by itself as it merely
introduces a new notifier chain which noone registers on.
 2. Changeset 882 depends on 881. If you revert just 881 then the tree will
not build.

 -- Keir

On 03/06/2009 21:15, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

>>> Is it better to have the new option added by
>>> c/s(CONFIG_PCI_IOMULTI) default 'n' ?
> 
> Turning off that option doesn't stop my dom0 from crashing.
> Reverting 881 DOES stop my dom0 from crashing.  Attached are
> the boot output for fail and success (the only difference
> between the two dom0's is the success has 881 reverted).
> 
> Of note, the fail log has three lines of the type:
> 
> "Driver 'xxx' needs updating - please use bus_type methods"
> 
> (xxx = usbfs, hub, usb) and the success log has a line that says:
> 
> "PCI IO multiplexer device installed"
> 
> which is missing in the fail log.
> 
>> -----Original Message-----
>> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
>> Sent: Wednesday, June 03, 2009 12:45 PM
>> To: Dulloor
>> Cc: Isaku Yamahata; Dan Magenheimer; Xen-Devel (E-mail)
>> Subject: Re: Dom0 crashing when built with c/s 881 (Was: [Xen-devel]
>> blktap2: need more than 3 values to unpack)
>> 
>> 
>> Depends on the feature's impact when unused.
>> 
>>  -- Keir
>> 
>> On 03/06/2009 18:57, "Dulloor" <dulloor@xxxxxxxxx> wrote:
>> 
>>> Is it better to have the new option added by
>> c/s(CONFIG_PCI_IOMULTI) default
>>> 'n' ?
>>> 
>>> -dulloor
>>> 
>>> On Wed, Jun 3, 2009 at 1:48 PM, Keir Fraser
>> <keir.fraser@xxxxxxxxxxxxx> wrote:
>>>> Perhaps post a diff of boot output with c/s 880 vs c/s
>> 881. I've cc'ed
>>>> Isaku, who submitted the patch that's causing your problem.
>>>> 
>>>>  -- Keir
>>>> 
>>>> On 03/06/2009 18:35, "Dan Magenheimer"
>> <dan.magenheimer@xxxxxxxxxx> wrote:
>>>> 
>>>>> OK, it appears that linux-2.6.18-xen.hg c/s 881 is causing
>>>>> my dom0 to crash.  Dom0 boots successfully at 880 and fails
>>>>> with 881 or anything after.
>>>>> 
>>>>> Any ideas?
>>>>> 
>>>>>> -----Original Message-----
>>>>>> From: Dan Magenheimer
>>>>>> Sent: Tuesday, June 02, 2009 10:45 PM
>>>>>> To: Dan Magenheimer; Keir Fraser; Dutch Meyer; Xen-Devel (E-mail)
>>>>>> Subject: RE: [Xen-devel] blktap2: need more than 3
>> values to unpack
>>>>>> 
>>>>>> 
>>>>>> Followup: my dom0 boots failed with 888, boots fine with 876,
>>>>>> then to ensure no pilot error, I rebuilt 888 again and it
>>>>>> failed again.
>>>>>> 
>>>>>>> -----Original Message-----
>>>>>>> From: Dan Magenheimer
>>>>>>> Sent: Tuesday, June 02, 2009 5:50 PM
>>>>>>> To: Keir Fraser; Dutch Meyer; Xen-Devel (E-mail)
>>>>>>> Subject: RE: [Xen-devel] blktap2: need more than 3
>> values to unpack
>>>>>>> 
>>>>>>> 
>>>>>>> Thanks.  It is indeed a pilot error on my part but a bit
>>>>>>> more bizarre.  I apparently have a linux-2.6-xen.hg directory
>>>>>>> as both a sister and a child to xen-unstable.hg.  In this
>>>>>>> case the build apparently chooses the child.  I was
>>>>>>> looking at and modifying the un-updated child so
>>>>>>> blktap2 wasn't even present yet.  Removing the child
>>>>>>> causes the sibling to build.  BUT! Now dom0 is
>>>>>>> crashing early on during boot.  (This is an Intel
>>>>>>> Weybridge box.)  I'll look into this further tomorrow.
>>>>>>> 
>>>>>>> ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>>>>>>> ata2.00: ATAPI, max UDMA/100
>>>>>>> ata2.00: configured for UDMA/100
>>>>>>> scsi2 : ahci
>>>>>>> ata3: SATA link down (SStatus 0 SControl 300)
>>>>>>> scsi3 : ahci
>>>>>>> ata4: SATA link down (SStatus 0 SControl 300)
>>>>>>>   Vendor: ATA       Model: ST3320620AS       Rev: 3.AA
>>>>>>>   Type:   Direct-Access                      ANSI SCSI
>> revision: 05
>>>>>>> ata1: EH pending after completion, repeating EH (cnt=4)
>>>>>>>   Vendor: LITE-ON   Model: DVDRW LH-20A1S    Rev: 9L03
>>>>>>>   Type:   CD-ROM                             ANSI SCSI
>> revision: 05
>>>>>>> (XEN) PCI add device 00:1f.5
>>>>>>> ata_piix 0000:00:1f.5: MAP [ P0 P2 P1 P3 ]
>>>>>>> ACPI: PCI Interrupt 0000:00:1f.5[B] -> GSI 19 (level,
>> low) -> IRQ 16
>>>>>>> ata5: SATA max UDMA/133 cmd 0x0 ctl 0x2 bmdma 0x0 irq 16
>>>>>>> ata6: SATA max UDMA/133 cmd 0x0 ctl 0x2 bmdma 0x0 irq 16
>>>>>>> scsi4 : ata_piix
>>>>>>> scsi5 : ata_piix
>>>>>>> device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised:
>>>>>>> dm-devel@xxxxxxxxxx
>>>>>>> Kernel panic - not syncing: Attempted to kill init!
>>>>>>>  (XEN) Domain 0 crashed: rebooting machine in 5 seconds.
>>>>>>> 
>>>>>>>> -----Original Message-----
>>>>>>>> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
>>>>>>>> Sent: Tuesday, June 02, 2009 4:45 PM
>>>>>>>> To: Dan Magenheimer; Dutch Meyer; Xen-Devel (E-mail)
>>>>>>>> Subject: Re: [Xen-devel] blktap2: need more than 3 values
>>>>>> to unpack
>>>>>>>> 
>>>>>>>> 
>>>>>>>> Probably you had an old .config hanging around in your build
>>>>>>>> tree somewhere.
>>>>>>>> c/s 889 should fix this for a fresh build.
>>>>>>>> 
>>>>>>>>  -- Keir
>>>>>>>> 
>>>>>>>> On 02/06/2009 18:33, "Dan Magenheimer"
>>>>>>>> <dan.magenheimer@xxxxxxxxxx> wrote:
>>>>>>>> 
>>>>>>>>> Thanks.  Looks like a partial configuration patch got checked
>>>>>>>>> in for blktap2 (cs 886)?  CONFIG_XEN_BLKDEV_TAP2 must be
>>>>>>> configured
>>>>>>>>> but afaict is not turned on by default (yet?).  So a fresh
>>>>>>>>> xen-unstable tip doesn't build the blktap2 driver.  See:
>>>>>>>>> 
>>>>>>>>> 
>>>>>> http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/3e01555dd227
>>>>>>>>> 
>>>>>>>>> (I'm guessing since this was submitted by Isaku that blktap2
>>>>>>>>> shouldn't be the default on ia64?)
>>>>>>>>> 
>>>>>>>>> Should CONFIG_XEN_BLKDEV_TAP2 be turned on by default, instead
>>>>>>>>> of CONFIG_XEN_BLKDEV_TAP, at least on x86?
>>>>>>>>> 
>>>>>>>>> I tried modifying
>>>>>>>>> 
>>>>>>>>> linux-2.6.18-xen.hg/buildconfigs/linux-defconfig_xen0_x86_32
>>>>>>>>> 
>>>>>>>>> (and also
>>>>>>>>> 
>>>>>>>>> linux-2.6.18-xen.hg/buildconfigs/linux-defconfig_xen_x86_32)
>>>>>>>>> 
>>>>>>>>> followed by:
>>>>>>>>> 
>>>>>>>>> KERNELS=linux-2.6-xen0 make linux-2.6-xen-config
>>>>>>>> CONFIGMODE=oldconfig
>>>>>>>>> 
>>>>>>>>> (I don't need or want to go through a manual config process)
>>>>>>>>> 
>>>>>>>>> but BLKDEV_TAP is always selected, not BLKDEV_TAP2.
>>>>>>>>> 
>>>>>>>>> Finally, I resorted to manually changing
>>>>>>>>> 
>>>>>>>>> linux-2.6.18-xen.hg/drivers/xen/Kconfig
>>>>>>>>> 
>>>>>>>>> and this succeeds in turning it on, but it just reverses the
>>>>>>>>> above checked-in patch, so I suspect that's not the right
>>>>>>>>> answer either.
>>>>>>>>> 
>>>>>>>>>> -----Original Message-----
>>>>>>>>>> From: Dutch Meyer [mailto:dmeyer@xxxxxxxxx]
>>>>>>>>>> Sent: Tuesday, June 02, 2009 9:05 AM
>>>>>>>>>> To: Dan Magenheimer
>>>>>>>>>> Subject: RE: [Xen-devel] blktap2: need more than 3
>>>>>>> values to unpack
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> I think that you don't have the blktap2 driver loaded in
>>>>>>>>>> dom0.  A clean
>>>>>>>>>> build/install of the dom0 kernel image should sort
>> you out.  If
>>>>>>>>>> drivers/xen/blktap2 is compiled in it should be setting up
>>>>>>>>>> these paths.
>>>>>>>>>> 
>>>>>>>>>> Let me know if that fixes things and I'll make python
>>>>>>> spit out more
>>>>>>>>>> meaningful errors, otherwise we can try to figure out the
>>>>>>>>>> blktap2 kernel
>>>>>>>>>> code isn't working.
>>>>>>>>>> 
>>>>>>>>>> --Dutch
>>>>>>>>>> 
>>>>>>>>>> On Tue, 2 Jun 2009, Dan Magenheimer wrote:
>>>>>>>>>> 
>>>>>>>>>>> It replies with "didn't find blktap-control in /proc/misc"
>>>>>>>>>>> 
>>>>>>>>>>> If that fails, perhaps the path doesn't exist, but I looked
>>>>>>>>>>> and /sys/class/blktap2 doesn't exist.
>>>>>>>>>>> 
>>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>>> From: Dutch Meyer [mailto:dmeyer@xxxxxxxxx]
>>>>>>>>>>>> Sent: Monday, June 01, 2009 10:37 PM
>>>>>>>>>>>> To: Dan Magenheimer
>>>>>>>>>>>> Subject: RE: [Xen-devel] blktap2: need more than 3
>>>>>>>> values to unpack
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>> Can you try this from the command line:
>>>>>>>>>>>> 
>>>>>>>>>>>>      tapdisk2 -n aio:/pathto/file.img
>>>>>>>>>>>> 
>>>>>>>>>>>> If successful, this will create your aio device and print a
>>>>>>>>>>>> /dev device
>>>>>>>>>>>> associated with it.
>>>>>>>>>>>> 
>>>>>>>>>>>> In that case you'll then be able to remove it with:
>>>>>>>>>>>> 
>>>>>>>>>>>>      echo 1 > /sys/class/blktap2/<disk>/remove
>>>>>>>>>>>> 
>>>>>>>>>>>> Where <disk> will be obvious from the output of the
>>>>>>>>>> tapdisk2 command.
>>>>>>>>>>>> 
>>>>>>>>>>>> However, I expect that this will fail.
>>>>>>>>>>>> 
>>>>>>>>>>>> --Dutch
>>>>>>>>>>>> 
>>>>>>>>>>>> On Mon, 1 Jun 2009, Dan Magenheimer wrote:
>>>>>>>>>>>> 
>>>>>>>>>>>> Then I might be able to help, but I'm not sure how to
>>>>>>>>>>>> reproduce it.  If
>>>>>>>>>>>> you send a log file and config for this latter error I'll
>>>>>>>>>>>> take a look.
>>>>>>>>>>>> 
>>>>>>>>>>>> Here ya go.
>>>>>>>>>>>> 
>>>>>>>>>>>> Thanks,
>>>>>>>>>>>> Dan
>>>>>>>>>>>> 
>>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>>> From: Dutch Meyer [mailto:dmeyer@xxxxxxxxx]
>>>>>>>>>>>> Sent: Monday, June 01, 2009 8:32 PM
>>>>>>>>>>>> To: Dan Magenheimer
>>>>>>>>>>>> Cc: Xen-Devel (E-mail)
>>>>>>>>>>>> Subject: Re: [Xen-devel] blktap2: need more than 3
>>>>>>>>>> values to unpack
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>> The tap:aio:/pathto/file.img syntax that you're
>>>>>> using in your
>>>>>>>>>>>> config was
>>>>>>>>>>>> changed before blktap2 was introduced.
>>>>>>>>>>>> tap:tapdisk:aio:/pathto/file.img is
>>>>>>>>>>>> apparently the correct syntax now, though the
>> README didn't
>>>>>>>>>>>> get updated to
>>>>>>>>>>>> reflect this.  Our blktap2 documentation is no better -
>>>>>>>>>> I'll try to
>>>>>>>>>>>> remedy that this week.
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>> If you're still seeing this error:
>>>>>>>>>>>>     "Error: 'file' object has no attribute 'find'"
>>>>>>>>>>>> 
>>>>>>>>>>>> Then I might be able to help, but I'm not sure how to
>>>>>>>>>>>> reproduce it.  If
>>>>>>>>>>>> you send a log file and config for this latter error I'll
>>>>>>>>>>>> take a look.
>>>>>>>>>>>> Yang seems to be reporting the same thing in
>>>>>> another thread.
>>>>>>>>>>>> 
>>>>>>>>>>>> --Dutch
>>>>>>>>>>>> 
>>>>>>>>>>>> On Mon, 1 Jun 2009, Dan Magenheimer wrote:
>>>>>>>>>>>> 
>>>>>>>>>>>> Hmmm... trying blktap2 for the first time, using 19682.
>>>>>>>>>>>> I had thought that the syntax hadn't changed, but I am
>>>>>>>>>>>> getting what appears to be a parsing error on
>> my vbd line.
>>>>>>>>>>>> 
>>>>>>>>>>>> "ValueError: need more than 3 values to unpack"
>>>>>>>>>>>> 
>>>>>>>>>>>> Thinking maybe that "w!" was the culprit, I changed
>>>>>>>>>>>> it to "w" with no change in result.
>>>>>>>>>>>> 
>>>>>>>>>>>> Looking at the python code that generated the error,
>>>>>>>>>>>> I tried to figure out the syntax by experimentation
>>>>>>>>>>>> but without luck.  I tried:
>>>>>>>>>>>> 
>>>>>>>>>>>> tap:tapdisk:aio:/pathto/file.img
>>>>>>>>>>>> 
>>>>>>>>>>>> but got "Error: 'file' object has no attribute 'find'"
>>>>>>>>>>>> 
>>>>>>>>>>>> To see if I could use the old blktap, I tried
>>>>>>>>>>>> 
>>>>>>>>>>>> tap:tapdisk:ioemu:/pathto/file.img
>>>>>>>>>>>> 
>>>>>>>>>>>> but got the dreaded "Error: Device 768 (tap)
>> could not be
>>>>>>>>>>>> connected. Hotplug scripts not working"
>>>>>>>>>>>> 
>>>>>>>>>>>> Am I missing something in the syntax for blktap2?
>>>>>>>>>>>> Is there a how-to or readme I didn't find?  Or
>>>>>>>>>>>> is there some required dependency I don't know about
>>>>>>>>>>>> that is missing?
>>>>>>>>>>>> 
>>>>>>>>>>>> I thought maybe I had a bad install, so rebuilt and
>>>>>>>>>>>> reinstalled with the same result.
>>>>>>>>>>>> 
>>>>>>>>>>>> xend.log and config file attached.
>>>>>>>>>>>> 
>>>>>>>>>>>> Thanks,
>>>>>>>>>>>> Dan
>>>>>>>>>>>> 
>>>>>>>>>>>> P.S. I am trying blktap2 because both blktap and
>>>>>>>>>>>> file-backed fail.  Blktap sometimes reads garbage
>>>>>>>>>>>> from the file and
>>>>>>>>>>>> 
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> Xen-devel mailing list
>>>>>>>>>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>>>>>>>>>> http://lists.xensource.com/xen-devel
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> _______________________________________________
>>>>>>>>> Xen-devel mailing list
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>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>> 
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>>>>>>> 
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>>>> 
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