Hi All - I'm seeing write-lock lockups... this is happening with the Fedora kernels from at least as far back as their 2.6.15-1.1833_FC4 (2.6.15.5) and as recently as their 2.6.16-1.2111_FC4 (2.6.16.17). It's a beefy box: Gateway 9515R - Intel ICH5/ICH5R Two Dual Core 3.0 ghz Xeons, 4GB RAM All disks via Emulex LP101-H (thor), switched fabric to Hitachi WMS SAN storage. The lockups are not process-specific. Running mke2fs on large filesystems seems to get it happen sooner rather than later. I can fish out any other data you need, run tests, etc. Thanks, ccb -- Charles C. Bennett, Jr.