Ubuntu
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System soft lockups when copying large files

Asked by chris hunter

I recently upgraded from 9.10 to 10.10, and am copying some files from a RAID-0 to a single disk in preparation of creating a RAID-5. Smaller files are copied, but when copying larger files ~50 GB system freezes during copying, does not return control, does not respond to keyboard/mouse or ssh requests and does not complete copying.
This happens when copying via Nautilus or using cp.

Started copying and switched TTYs to run top, and at point of freezing kswap takes 100% of CPU time. No error messages are logged to dmesg, so it took me a while to find that if I switched TTYs before freezing then it will print to my console:

BUG: soft lockup - CPU#0 stuck for 61s! [kswapd0:128]
And then some hex code, but since I am typing this by hand I will include it if it is helpful.

A search through the Internet has found this on Redhat's bugzilla, and comments indicate that they have seen it happen on Ubuntu 10.10:
https://bugzilla.redhat.com/show_bug.cgi?id=649694

What should happen - copying should complete.

Has this patch been incorporated, and does anyone have any ideas on why this could be happening?

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Anil Shashikumar Belur (askb23) said : 		#1

Hi, Just would to confirm if this is related to the same issue, do you have a stack trace on /var/log/syslog or through dmesg Or if you have kdump configured vmcore file captured in the event when the issue occurred, as it may be useful in analysing if this is the same issue as BZ provided.

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