Messages in this thread |  | | Date | Mon, 12 Nov 2001 13:01:23 -0500 (EST) | From | "Gord R. Lamb" <> | Subject | I/O lockup |
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Hi everyone,
I've been having a problem for a while now with a strange lockup induced under heavy SCSI I/O (particularly when I write directly to block devices with dd of=/dev/sd?, but also when writing to a filesystem on that device). I'm writing around 50-100mb/sec over FC (qlogic 2200) under Linux 2.4 (tried 2.4.3 through 2.4.10).
It seems that some vm or I/O related spinlock is being taken and held, but not released (?). There is no oops or BUG() or anything (no messages at all in fact).. all I/O just stops. I can still invoke sysrq, type characters at the console, etc. In fact, usually top continues to run and display kswapd as the dominant process.
Any ideas?
- Gord R. Lamb (glamb@max-t.com) Maximum Throughput, Inc. Sr. Systems Architect
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