Re: [Xen-API] Issues with XenAPI on CentOS 6.3

[John Garbutt <John.Garbutt@xxxxxxxxxxxxxxx>]

Hi,

Thanks for talking a look :-)

The original code was using Unixext, and had the same errors, from what I
remember.

I tried with 3.12.1 and 4.00.1 and have got the same errors.

I am guessing the issue is specific to the CentOS kernel of 3.4.x? Don't
really have any sound reasons why though.

It is interesting that the standalone code seems to work perfectly, and I
can cat the file, but when running inside the xapi deamon, it fails.

John

On 11/03/2013 12:36, "Dave Scott" <Dave.Scott@xxxxxxxxxxxxx> wrote:

>Hi,
>
>In the broken strace, I can't explain the different sequence of syscalls
>between the file that works (lstat; open) and the file that doesn't
>(lstat; stat; access; open). I also can't reproduce the behaviour you see
>on my Ubuntu with ocaml 3.12.1. Out of curiousity, which ocaml version
>are you using?
>
>However this is the second time recently we've been bitten by unwanted
>behaviour in the buffered I/O channel code. Since we're dealing with
>low-level stuff like sysfs 'files' where the behaviour of file I/O may
>not exactly match that of regular files, I recommend that we drop down to
>the low-level Unix.* functions which map directly onto syscalls.
>
>Assuming these sysfs files only contain one line of text anyway, how
>about replacing
>
>    read_one_line file
>
>with
>
>    Unixext.string_of_file file
>
>Cheers,
>Dave
>
>> -----Original Message-----
>> From: xen-api-bounces@xxxxxxxxxxxxx [mailto:xen-api-
>> bounces@xxxxxxxxxxxxx] On Behalf Of John Garbutt
>> Sent: 07 March 2013 3:03 PM
>> To: Mike McClurg
>> Cc: xen-api@xxxxxxxxxxxxx
>> Subject: Re: [Xen-API] Issues with XenAPI on CentOS 6.3
>> 
>> Hey Mike,
>> 
>> Still stuck with these permissions issues when running XAPI on CentOS
>>6.3
>> 
>> I have extracted some strace from a standalone OCAML program that works:
>> https://gist.github.com/JohnGarbutt/5108513
>> 
>> I have hacked up XAPIs ballon.ml, there the permissions error occurs,
>>to use
>> the above code. The same code as above, when running as part of XAPI,
>>was
>> able to read my test file, but was unable to read
>> /sys/devices/system/xen_memory/xen_memory0/info/current_kb
>> 
>> I have managed to capture the strace here, by adding the "-nowatchdog"
>> param to xapi:
>> https://gist.github.com/JohnGarbutt/5108563
>> 
>> Any ideas welcome!
>> 
>> John
>> 
>> On 1 March 2013 19:37, Mike McClurg <mike.mcclurg@xxxxxxxxxx> wrote:
>> > On 01/03/13 17:43, John Garbutt wrote:
>> >>
>> >> I installed xenopsd using OPAM, not sure how to get hold of the
>> >> associated code to check what it is doing.
>> >
>> >
>> > You're probably using the opam remote
>> > 'github.com/xen-org/opam-repo-dev/',
>> > which tells me...
>> >
>> > https://github.com/xen-org/opam-repo-
>> dev/blob/master/packages/xenopsd.
>> > 1.0.0/url
>> >
>> > ... that the xenopsd repo you've installed is here:
>> >
>> > git://github.com/djs55/xenopsd.git
>> >
>> > I'll take a look at your other run-time issue now.
>> >
>> > Mike
>> 
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