>From IRC, an example of a testcase:
1) create around ~300GB of small files (sqlite files for example), put the
files into a list sqlite-files.txt
2) Start the copy:
cat sqlite-files.txt | xargs -n1 -I{} -P2 sudo sh -c 'rm -f {}.new; cat {} >
{}.new; echo {}'
3) When it hangs, identify where it hung as $NUM and resume with the following:
tail -n+$NUM | xargs -n1 -I{} -P2 sudo sh -c 'rm -f {}.new; cat {} > {}.new;
echo {}'
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https://bugs.launchpad.net/bugs/1349711
Title:
Machine lockup in btrfs-transaction
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