If you have processes keeping a file open, the space doesn't get
reclaimed until the file is closed or the process is killed. Obviously,
the latter tends to happen when you reboot a system. This is standard
practice going back to 1970's and Unix; in fact, it is required by the
POSIX standard.
Why df is hanging is a separate issue. Creating a separate bug
against the kernel and including the output of "strace df -h" might be
helpful.
** Changed in: e2fsprogs (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1319667
Title:
root file system 100% full, goes 52% after reboot
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