Empirical testing of Open Source Operating System Reliability

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1 Empirical testing of Open Source Operating System Reliability Anandeep Pannu & John Kew Open Source Software Lab (OSSL), Microsoft

2 Introduction What is the OSS Lab? Motivation Experimental Setup Results So what does this all mean? Conclusion & future work

3 Technology Understanding Change Agent Innovation Innovation Interoperability Interoperability Cultural Understanding Technology Technology Research Research

4 Motivation Product groups want to know - how reliable is Linux? How does it compare? What can we do to assess reliability if the source code is available? Can the community process introduce enhancements that can be then be measured again?

5 Experimental Setup Pick distributions of Linux Re-compile kernel with fault inducing modules Crash the system Analyze event logs Introduce enhancement to kernel Repeat

6 Results with standard kernel Type of event Detected? Kernel panic No Memory overwrite No Boot disk failures No User space program induced freezes No Power failures No (for most hardware)

7 Results with enhanced kernel (kdump + heartbeat) Type of event Detected? Kernel panic Yes Memory overwrite Yes Boot disk failures No User space program induced freezes Yes Power failures No (for most hardware)

8 So what does this all mean? Event logs are soooooo important! Little enhancements lead to giant advances A way for developers to test out if crashes are diagnosable (useful for someone else besides academics!) Open source systems will change the way empirical reliability research is done Events co-related to environments to bugs to modules to developers Predict reliability using techniques for software code analysis?

9 Conclusion and future work Complete the loop deploy in the field Use Linux built in fault injection to obtain more data Start linking back errors to those damn developers! Larger scale study of open source software reliability

10 2006 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

11 Experimental Setup Hardware Dell Optiplex GX270 Intel Pentium IV 3GHz, 800MHz FSB 1 GB DDR SDRAM 400 MHz 80 GB 7200RPM Parallel ATA, ATAPI 48X DVD/CD-R/RW Intel PRO Gigabit Network Serial Port Toshiba Portege 7200 CTe Series Pentium III 650 Mhz E (256K L2 cache on die) 192MB PC100 SDRAM 8GB EINDE ATA-4 Interface Docking Station: Serial Port, 20x DVD/CD, Ethernet port

12 Experimental Setup Hardware HP Proliant DL380 2 x Intel Xeon 3.2 Ghz processors with 2MB Cache 1 GB DDR2 666Mhz RAM 3 x 36GB 15K RPM, Ultra pin SCSI HD, Hot Plug, Smart Array, StorageWerks, RAID 1.44 Floppy, 24xCDROM Drive

13 Experimental Setup Software Version Kernel Notes OS RHEL4 AS ELsmp Base install of RHEL 4-AS, with all current up2date patches. Server only. OS RHEL4 - WS EL Base install of RHEL 4-AS, with all current up2date patches. OS Ubuntu Base install of Ubuntu 6.06 (Dapper) with current patches. Workstations only.

14 Experimental Setup Data Collection HTTP Test Reporting Logging Server HTTP Status Logger Serial Console Logger Analysis Tools Log Files Test System Testing Scripts/ Modules/ Programs Dell Optiplex GX270 OR Serial Cable Console Logging Toshiba Portege 7200 HP Proliant DL380 Server

15 Experimental Setup Tests Performed Six primary tests, and one control experiment: Normal System Startup ( Control ) Kernel Panic via Kernel module Memory Overflow Module Crashme Simulated Power Outage Removal of Non Boot Hard Drive Removal of Boot Hard Drive

16 Data Collected Scenario Normal System Startup Kernel Panic Module Notes Trivial differences in logs (PID, times, Mhz) Instant crash. No indication of failure except through the absence of shutdown. Module Overflow Module Instant crash. No indication of failure except through absence of shutdown. Attempted writes at 0x219af3 (kernel code), 0x329af4(kernel data), and 0x3ccb78(1 byte past the kernel data section) Crashme No crashes. Slow response. Used seeds 789, 279, and 666. No indication of failure except through absence of shutdown Power No indication of failure except through absence of shutdown. Non Boot Drive Removal (CDROM) Boot Drive Removal Crash within a few seconds. Drive and ATAPI errors in log before full crash. No crash, but unable to shutdown properly. Programs which had already been loaded into RAM worked. Many console messages, but no log (because the drive was disconnected).

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