Is it a bug of kexec?

[Bill Lee]

In Ubuntu 10.04 LTS, when executing 'kexec -e', mounted file systems
will not be umounted, and the caches/buffers will not sync to devices.
So it may cause data lost.
According to the man page of kexec, 'kexec -e' will call 'shutdown'. So
I test out 'shutdown now', and I found that all processes are killed,
but it does not perform umounting or syncing.
So I think it is a bug of either kexec or shutdown.

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Best regards,
Bill Lee