I did some testing on this issue, and initially thought I had a culprit with mkfs.ext4:
http://people.canonical.com/~vanhoof/lazy_itable_init_testing_plus_dirty/ However it has been proven to occur even with a more generic file copy operation. I was able to grab some perf top results today during an instance of this lockup: http://people.canonical.com/~vanhoof/lazy_itable_init_testing_plus_dirty/perftop/ Which does show a large spike in shrink_slab when this hits. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/755066 Title: heavy i/o on sandybridge systems with small memory footprints causes system hangs -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
