> > > > Updating to 1.6.0 of makedumpfile didn't help. :( > > > > Does anyone else have suggestions on how to debug this? From my original > post, the dump kernel just reboots and I'm not sure why. Where can I add > printks to gather more info on why the dump kernel gives on on the dump?
Seems this issue was a bug in makedumpfile that is fixed with this commit: commit 2c21d4656e8d3c2af2b1e14809d076941ae69e96 Author: Vitaly Kuznetsov <vkuzn...@redhat.com> Date: Fri Jun 17 18:41:26 2016 +0900 [PATCH v2] Support _count -> _refcount rename in struct page _count member was renamed to _refcount in linux commit 0139aa7b7fa12 ("mm: rename _count, field of the struct page, to _refcount") and this broke makedumpfile. The reason for making the change was to find all users accessing it directly and not through the recommended API. I tried suggesting to revert the change but failed, I see no other choice than to start supporting both _count and _refcount in makedumpfile. Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com> I found this fix in the devel branch of git://git.code.sf.net/p/makedumpfile/code. I'm surprised others aren't seeing this? All 6 of my development systems stop being able to get vmcore dumps with 4.7-rc... Steve.