I've converted the chm file to PRC using mobipocket reader's import menu. Then I tried that PRC to epub. Its stuck since last night.
C:\Program Files\calibre>ebook-convert.exe "d:\data\My eBooks\LinuxKernel.prc" Test.epub
1% Converting input to HTML...
InputFormatPlugin: MOBI Input running on d:\data\My eBooks\LinuxKernel.prc
Malformed markup, parsing using BeautifulSoup
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