On Thu, Aug 14, 2025 at 06:23:23PM +0100, Mark Bannister wrote: > > > Thanks for the bug report and debugging info. I think I know what is > > > going on, I've attached a patch that should hopefully fix it. > > > Basically, it looks like the BMC is alive enough that it sort of > > > responds to the host, but not alive enough to actually complete a > > > transaction. The driver needs to not immediately retry in that case, it > > > needs to delay a bit. > > > > > > It passes all my tests, but the situation you are in would be hard to > > > manufacture for me. > > > > > > Can you try this patch? > > > > Thanks for the super quick response, I'll try out this patch and report > back my findings. > > > > Best regards > > Mark > > The patch looks good. Without the patch I was able to reproduce the > problem on kernels 6.6 and 6.12 (but not 6.1) after 5-20 attempts of > running 'ipmitool mc reset cold' every 2 minutes. With the patch, I have > run it 50 times without incident.
Perfect, I'll queue it for the next kernel release. I can get it into the current release if it's urgent. The change that caused this was c608966f3f9c "ipmi: fix msg stack when IPMI is disconnected" and it came in between 6.1 and 6.6. I'm adding the author of that patch because this change may affect that. In hindsight I think the fix that caused this is wrong. I'm not sure how what the author said was happening could happen. There's a limit of 100 messages per user. I am inclined right now to revert that change. > The hosed counter isn't as much of an > indicator as I thought, I saw it in the tens of thousands with and without > the patch, I have also seen it in the hundreds of thousands without the > patch and on other hardware I have seen it reach 5 million in one hour > without the patch (but also without incident). Yeah, that's just a count of how many issues it has with the BMC. You will still see it go up. -corey > > We will incorporate your patch into our builds so that we avoid hitting > this problem in production again. > > Best regards > Mark _______________________________________________ Openipmi-developer mailing list Openipmi-developer@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openipmi-developer
