PART 2: Eventually I realized that while I couldn't do anything with bash, I could run (some) commands directly via ssh (ssh odin <command>) and they would work ok. I was able to run dmesg, cat some files. Was able to ls some directories for a while, but eventually couldn't anymore. Was NOT able to cat /proc/mdstat. It would just hang. Attached (dmesg_1.txt) is the dmesg output I got, which seems to include everything from the start of the reshaping up to the lockup. The RAID system definitely seems to be involved. After waiting a day or so with no change and nothing else working I gritted my teeth and did a hard reboot, hoping my array wasn't totally hosed. Fortunately, I was able to reassemble the array using the backup file specified as part of my conversion command and the reshaping picked back up where it left off. It completed without further incident (took about 4 days). Once the reshaping was complete I ran fsck on its filesystem (came back clean even when forced), mounted it, and everything looked ok. No files appeared to be lost. Chalking the freeze up to a one-time problem related to the reshaping, I started copying all the data from one of the other 1.5TB drives into the md0. (The idea is to keep copying each drive's contents into the array, wiping it, adding it as a hot spare, and then growing the RAID and its filesystem accordingly.) When I'm almost done (the 1.5TB only has 55GB left on it) the system hangs again. Same symptoms as before. I was able to run dmesg again (dmesg_2.txt) and the call trace looks pretty similar. It still mentions the RAID system a good bit, even though no high level RAID operations were going on and I was just writing to the array. This time I only waited an hour or two before giving up and opting for the hard reboot. Once again the array seemed to be ok once it was brought back up. Seems to be a fairly fundamental problem, whatever it is, and anything that causes a lockup like this is a pretty big bug in a stable kernel. The individual drives test out fine with everything I've tried. Everything looks completely healthy until these lockups occur. I've attached my lspci and kernel config in case there's something useful in there. Any ideas? Mike -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
