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Re: xfsdump SGI_FS_BULKSTAT errno = 22, how could this IRIX bug get into

To: mlueck@xxxxxxxxxxxxxxxxxxxx
Subject: Re: xfsdump SGI_FS_BULKSTAT errno = 22, how could this IRIX bug get into Ubuntu 10.04 Lucid between kernels 2.6.32-27 and 2.6.32-26?
From: Bill Kendall <wkendall@xxxxxxx>
Date: Wed, 02 Feb 2011 12:32:59 -0600
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <iibmah$dlp$1@xxxxxxxxxxxxxxx>
References: <iibmah$dlp$1@xxxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101208 Thunderbird/3.1.7
On 02/02/2011 07:30 AM, Michael Lueck wrote:

Somehow a reported IRIX bug with XFS got into Ubuntu 10.04 (Lucid) starting 
with kernel 2.6.32-27.

I am cross posting to this list in order to receive details as to what bug got 
in Ubuntu which has
been solved in IRIX, hoping with more details Ubuntu might make the same fix.

Aside from the fact that the errno is the same, there's nothing to suggest
that the Ubuntu problem is the the same bug. The IRIX bug is quite old.

Ubuntu has since updated their kernel to 2.6.32-28 and someone already verified 
at the bug report
that the problem persists with that kernel version.

"Regression between 2.6.32-27 and 2.6.32-26 xfsdump SGI_FS_BULKSTAT errno = 22"

Between 2.6.32-26 and 2.6.32-27, Ubuntu backported 4 XFS commits from
2.6.35/2.6.36. All are part of a bulkstat security fix.

% git log Ubuntu-2.6.32-26.48..Ubuntu-2.6.32-27.49 -- fs/xfs | grep commit
commit 52d2a4cfbc852da8c3d3b9fa0cac2a07b12f5cfd
    (cherry picked from commit 4536f2ad8b330453d7ebec0746c4374eadd649b1)
commit eb5ab28c8a5e4bb3f1ce05eba166c12175f6c701
    (backported from commit 7b6259e7a83647948fa33a736cc832310c8d85aa)
commit 5f8e8c6ab416bbd58d4f5df512c119a888ff923c
    (cherry picked from commit 1920779e67cbf5ea8afef317777c5bf2b8096188)
commit 52e0d703745f7110f1ecbe83c02cf06a83da82e8
    (backported from commit 7124fe0a5b619d65b739477b3b55a20bf805b06d)

I'm not aware of a similar problem upstream, so it would appear
to be a problem with Ubuntu's backport of these commits.


On our Ubuntu 10.04 LTS server running x86 code, this evening a kernel
update was ready for installation. I updated the kernel, rebooted
(IPL'ed), and proceeded with the backup which utilized xfsdump as we use
the xfs filesystem. Four of the xfsdump received a never before seen
error: SGI_FS_BULKSTAT errno = 22

Output as follows:
using file dump (drive_simple) strategy
version 3.0.4 (dump format 3.0) - Running single-threaded
level 0 dump of ldslnx01:/srv
dump date: Mon Dec 20 21:59:33 2010
session id: f98f8cc0-963f-41a6-9a19-a89192502bf0
session label: "data"
ino map phase 1: constructing initial dump list
ino map phase 2: skipping (no pruning necessary)
ino map phase 3: skipping (only one dump stream)
ino map construction complete
estimated dump size: 100739707392 bytes
WARNING: no media label specified
creating dump session media file 0 (media 0, file 0)
dumping ino map
dumping directories
SGI_FS_BULKSTAT failed: Invalid argument (22)
dump size (non-dir files) : 0 bytes
NOTE: dump interrupted: 79 seconds elapsed: may resume later using -R option
Dump Status: INTERRUPT

This backup file did have some size to it. The other three, backing up
smaller amounts of data, were all zero (0) length dump files.

I rebooted to the prior kernel: $ uname -a
Linux ldslnx01 2.6.32-26-generic-pae #48-Ubuntu SMP Wed Nov 24 10:31:20 UTC 
2010 i686 GNU/Linux

And the same backup gets to 100% success.

Reboot to the new kernel, same failure.

I think that fairly well illustrates that the problem exists only with
the kernel update installed this evening.


I did come across a reference to this problem on the SGI website:

1.6.17 Bugs fixed in IRIX 6.5.13
+ 816457: xfsdump SGI_FS_BULKSTAT errno = 22 cxfs

So evidently it is something that has been seen and corrected in IRIX.

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