linux-ext4 - [Bug 56831] New: RHEL Linux Data Corruption found with EXT4 system

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Message-ID: <bug-56831-13602@https.bugzilla.kernel.org/>
Date:	Fri, 19 Apr 2013 13:41:02 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 56831] New: RHEL Linux Data Corruption found with EXT4 system

https://bugzilla.kernel.org/show_bug.cgi?id=56831

           Summary: RHEL Linux Data Corruption found with EXT4 system
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.32-220
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: searchfordave@...il.com
                CC: lalwanihiro@...il.com
        Regression: No


The attached file when compiled on a 32GB Mem system, gives a data corruption
if run with number of threads greater than 15

How to run:
1. compile: # gcc random_multi_write_read.c -o test -lpthread
2. Usage:   # ./test <file path> <no. of threads>
3. Run:     # ./test file_1 15

Sample Output:
Starting 15 write threads to file_1 at different offsets and write sizes...
Parallelly reading the file for any data corruption...
DATA CORRUPTION HIT
Actual: '', Expected: 'K'd
, start:4581061500, end:5039167650
...

For More info, refer file "V_loop<%d>char<%c>" which gets created newly to
capture the corrupted data as soon as corruption is hit.

Test system details:
#CPUS: 2
#CORES: 6
SYSTEM MEMORY: 15 GB
SWAP MEMORY: 17 GB

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