On 11/20/18 at 03:05pm, Michal Hocko wrote: > > Yes, I applied Hugh's patch 8 hours ago, then our QE Ping operated on > > that machine, after many times of hot removing/adding, the endless > > looping during mirgrating is not seen any more. The test result for > > Hugh's patch is positive. I even suggested Ping increasing the memory > > pressure to "stress -m 250", it still succeeded to offline and remove. > > > > So I think this patch works to solve the issue. Thanks a lot for your > > help, all of you. > > This is a great news! Thanks for your swift feedback. I will go and try > to review Hugh's patch soon. Yeah. Thanks a lot for your help on debugging and narrowing down to position the cause of the issue, Michal, really appreciated! > > Meanwhile we found sometime onlining page may not add back all memory > > blocks on one memory board, then hot removing/adding them will cause > > kernel panic. I will investigate further and collect information, see if > > it's a kernel issue or udev issue. > > It would be great to get a report in a new email thread. Sure, will do after reproducing and inforamtion arranging. Thanks Baoquan
