From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.3) Gecko/20040924

Description of problem:
Based on the fsck log we collected from a customer site that reported data corruptions with a 1.8TB filesystem on RHEL 3 system, it was tentatively concluded that the issues found in bugzilla 138951 (opened against RHEL 4) was the cause. 

The filesystem is mounted as smb share that gets accessed via Window machines.

The symptoms include "ls" error messages such as:
                                                                                                                     
[root@nycpr350fil graphics]# ls -al
ls: athletic.zip: Input/output error
ls: •DSC_0010.psd: Input/output error
ls: •DSC_0014.psd: Input/output error
ls: WeatherPlusLOGOfeb9.eps: Input/output erro
                                                                                                                     
From /var/log/messages file:
                                                                                                                     
EXT3-fs error (device power2(232,49)): ext3_free_blocks: bit already cleared for block 33103513
                                                                                                                     
that shows bitmap corruption. The blocks that are in use may be marked as available for reuse and subsequently get allocated as "free" blocks.


Version-Release number of selected component (if applicable):
kernel-2.4.21-31.ELsmp

How reproducible:
Didn't try

Steps to Reproduce:
1. (occurs twice on mission cirtical production system)
2.
3.
  

Actual Results:  filesystem corrupted

Expected Results:  no corrutions

Additional info:

This has been occurred twice on a mission critical system with large LUN (1.8TB). Other than downtime is not acceptable, the fsck time for the LUN with this size is also unmanageable.