On 2011å03æ22æ 10:30, Tao Ma Wrote:
Hi Ted,
On 03/22/2011 08:47 AM, Ted Ts'o wrote:
Applied to the ext4 patch queue.
On Fri, Mar 18, 2011 at 05:58:03PM +0800, Robin Dong wrote:
From: Robin Dong<sanbai@xxxxxxxxxx>
When we do performence-testing on ext4 filesystem, we observe a warning like this:
"[ 1684.113205] EXT4-fs error (device sda7): ext4_mb_generate_buddy:718: group 259825901 blocks in bitmap, 26057 in gd"
indeed, it should be
"group 2598, 25901 blocks in bitmap, 26057 in gd"
[snip]
This bug is found on upstream 2.6.36 kernel. We ran a 2.6.36 kernel
on the online system with 8 Ext4 file systems. 2 of them are mounted
with delayed allocation feature. This warning is only observed on
delayed allocation enabled Ext4 file systems.
This issue is not easy to reproduce, on two servers with 2.6.36
kenrel + ext4, after running 110+ days, the error starts to appear
on kernel log. When check the error log, we found the info format
should be fixed, that's how this patch comes.
Can you send more information about what sort of workloads your
servers are under, and any other information about how to reproduce
it?
OK, so let me try to describe the situation here.
This is a web cache server and we use squid to cache some data. This bug
was found we were testing 2.6.36 vanilla kernel. We don't know for sure
how to reproduce it since it showed up when the test server ran for
about 100 days. And the bad thing is that the volume was reformatted for
another test. :( But we have several machines here, and we are
continuing our test, so if there are any error happening again, we
promise that we will prompt what we find immediately.
btw, when testing 2.6.32 kernel, we find another error, a dir inode is
corrupted and some error in message like
Mar 16 11:15:28 cache161 kernel: [484403.699588] EXT4-fs error (device
sda5): ext4_lookup: deleted inode referenced: 21496065
This volume is also mounted with delay allocation.
When we observed these 2 issues, the Ext4 file systems were mounted with delalloc option.
--
Coly Li
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