I discovered two more requirements to reproduce this bug: free RAM
should be low and swap must be enabled.
To "occupy" most of 8 GB RAM that I have after reboot I allocate it from python
script:
python -c 'import sys; t = "X" * 1024 * 1024 * 1024 * 5; sys.stdin.read()'
after that only about 15-25% RAM is free.
With disabled swap all works smoothly even with large vm sysctl settings
(vm.dirty_ratio = 60, vm.dirty_background_ratio = 40) and low free
memory.
I tested with kernel version 3.13.0-031300rc7-generic installed from provided
link and bug is reproducible.
I'm not tested yet with older Ubuntu releases, but I believe I experienced this
bug more than year ago too.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1267648
Title:
Copying large amount of files to USB stick makes system laggy or even
freeze/hang (temporary)
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