On Thu, 2024-05-09 at 11:52 +0800, Baoquan He wrote: > Hi, > > On 05/07/24 at 09:18am, Rik van Riel wrote: > > While taking a kernel core dump with makedumpfile on a larger > > system, > > softlockup messages often appear. > > > > While softlockup warnings can be harmless, they can also interfere > > with things like RCU freeing memory, which can be problematic when > > the kdump kexec image is configured with as little memory as > > possible. > > > > Avoid the softlockup, and give things like work items and RCU a > > chance to do their thing during __read_vmcore by adding a > > cond_resched. > > Thanks for fixing this. > > By the way, is it easy to reproduce? And should we add some trace of > the > softlockup into log so that people can search for it and confirm when > encountering it? It is pretty easy to reproduce, but it does not happen all the time. With millions of systems, even rare errors are common :) However, we have been running with this fix for long enough (we deployed it in order to test it) that I don't think we have the warning stored any more. Those logs were rotated out long ago. kind regards, Rik -- All Rights Reversed.
