On Thu, Dec 28, 2017 at 10:06:25AM +0800, Dou Liyang wrote:
> Hi Alexandru,
> 
> Thanks for testing !
> At 12/28/2017 12:18 AM, Alexandru Chirvasitu wrote:
> > As per instructions, I did the following:
> > 
> > (1)
> > 
> > Checked out
> > 
> > 464e1d5 Linux 4.15-rc5
> > 
> > (after getting my copy up to date, fetching, pulling ,etc.) and
> > compiled it as-is. Config attached (the one labeled 'np' for 'no
> > patch').
> > 
> > Result:
> > 
> > Boot with no extraparameters locks up after login, as before;
> > 
> > apic=debug does not panic, but locks up after login, as before;
> > 
> I also hope to see the log with "apic=debug" by "journalctl" command,
> though the logs don't have the lockup trace.

Ah, of course. Attached is the output of `journalctl --boot=-1` after
booting, getting locked up, and then rebooting a good kernel.

Slightly different version of 4.15-rc5; this one has both patches
applied, yours and Linus' for kexec, but the latter shouldn't make a
difference.

---

You'll see another trace in there that's been bugging me, about W=X
checking. I'm not qualified to judge how related they are, but during
these past few days I've compiled and tested many kernels, and many of
them have exhibited the W+X thing but *not* the lockups.

I hope to trace that one back to the original commit with another
bisect one of these days, but they do seem to be different issues.

> 
> Thanks,
> 	dou.
> > 
> 
> 
>