After more testing I have modified the original description because originally I was thinking it just affected XFS but now I don't think that is the case. I just got another crash when using Ext3 so now I'm not sure where the problem might be. It still looks like it probably has something to do with the filesystem layers though.
In this latest case all I did was start a 'grep' on a file and the CPU went to 100% and the process froze completely (could not be killed even with kill -KILL). A few seconds later I started getting the "BUG: soft lockup" errors. I have attached the latest error. ** Summary changed: - XFS on RAID array causing "BUG: soft lockup" errors/system freeze + RAID array causing "BUG: soft lockup" errors/system freeze ** Description changed: Running Ubuntu 8.10 Intrepid Desktop 64-bit with all current updates. Kernel is 2.6.27-9-generic #1 SMP Thu Nov 20 22:15:32 UTC 2008 x86_64 GNU/Linux. System is Abit IP35-Pro motherboard, Q9550 CPU, 8 GB RAM, 4 Western Digital WD6401AALS-00L3B2 drives (640 GB, SATA). - MemTest and drive tests returns no errors. Using a RAID5 array across the 4 drives with XFS as the file system. + MemTest and drive tests returns no errors. Using a RAID5 array across the 4 drives with XFS and Ext3 as the file systems. It seems when the system gets under heavy I/O load on the RAID array it will eventually freeze (requiring a hard reboot). The errors are inconsistent in how long they take to show up and the specific applications causing the I/O load don't seem to matter but the error always shows up eventually. It has already happened dozens of times after I start a load on the machine. Examples of scenarios where the bug has appeared: * Running Bonnie++ benchmarks. I have seen this kill the system within 30 seconds. Other times it causes no problems. * Running a large SQlite import while simultaneously tar/gzip'ing a large directory structure. * Running a large MySql import while tar/gzip'ing a large directory structure. * Multiple tar/gzip processes running at the same time. The specific process that gets the "CPU: soft lockup" error varies. I have seen it lockup in kswapd, pdflush, gzip, sqlite3, bonnie++ (see attached logs). - The error appears to be related to XFS because all the stack traces have - XFS calls in them. I have attached some of my stack traces. They - repeat many times and I have only included the first distinct events - before my system crashed. + I have attached some of my stack traces. They repeat many times and I + have only included the first distinct events before my system crashed. ** Attachment added: "lockups2.txt" http://launchpadlibrarian.net/20864107/lockups2.txt -- RAID array causing "BUG: soft lockup" errors/system freeze https://bugs.launchpad.net/bugs/312163 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
