Thanks to Yeti, tml and Pfeiffer, I finally realized what happend to the GSList.
May be I'm spoiled by Python, Java that I had the strange SHOULD-BE-NULL thought, now I know if I need to reuse the GSList* variable, the first thing is to assign NULL to it after g_slist_free (), also surprised g_slist_length() didn't gave a segmentation fault to me, aha.
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