Public bug reported:
System hangs have been observed when performing heavy i/o on sandybridge
systems with small memory footprints (less than 4GB of memory in this
case).
The issue was first discovered when running an a customized Natty
installer from an OEM. The installer initially copies all the files off
to a partition on the hard drive, and then the system is installed from
the hard disk. It is during the file copy phase that the systems will
hang. The hang is either indefinite or sometimes the system will
recover and complete the installation after several minutes.
A way to reproduce this behavior on a vanilla natty AMD64 image
installer image is as follows. You will need a sandybridge system with
UMA graphics, and preferably only 1GB of memory installed. 1GB seems to
reproduce it the most frequently.
1) Boot the image up in single user mode
2) Run this attached script
It sometimes doesn't happen on the first try, but usually by the second
or third try the behavior will happen (a tell tale sign is the HDD
indicator freezes).
The script wraps around the ubiquity file copy routine as it's very I/O
intensive since everything will be md5'ed as it's copied. It first
copies from the USB stick to a 2G partition, and then from that 2G
partition to another partition.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/755066
Title:
heavy i/o on sandybridge systems with small memory footprints causes
system hangs
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