I'm resending this response to Daisuke's patch because the mailing list seems to have been confused by the combination of his original patch and my response to it. The mailing list archive has "lost" my response, and shows this instead: https://www.redhat.com/archives/crash-utility/2011-April/msg00032.html which is actually the end of Daisuke's patch posting. Weird... Anyway, here's a cut-and-paste of my actual response, which was sent out individually OK, but I'm guessing that the "digest" version will show the bogus response above. ----- Original Message ----- Daisuke, I have seen this "unknown swap location" on rare occasions when running "vm -p" on the "ntpd" daemon. I had determined that the task had done an mprotect(PROT_NONE), but never got around to fixing it. Thanks for addressing this. Also, I will add a display of the new page_protnone field in both the x86_dump_machdep_table() and x86_64_dump_machdep_table() functions. Queued for the next release. Thanks, Dave