On 21 December 2021 22:25:35 GMT, Tom Lendacky <thomas.lendacky@xxxxxxx> wrote: >On 12/20/21 3:47 PM, Tom Lendacky wrote: >> On 12/20/21 3:29 PM, David Woodhouse wrote: >>> On Mon, 2021-12-20 at 12:54 -0600, Tom Lendacky wrote: >>>> Took the tree back to commit df9726cb7178 and then applied this change. >>>> I'm unable to trigger any kind of failure with this change. >>> >>> Hm... I fired up an EC2 m6a.48xlarge instance (192 CPUs) to play with. >>> >>> I can reproduce your triple-fault on SMP bringup, but only with kexec. >>> And I basically can't get *anything* to kexec without that triple- >>> fault. Not a clean 5.16-rc2, not the Fedora stock 5.14.10 kernel. >>> >>> If I *boot* instead of kexec, I have not yet seen the problem at all. >>> This is using Legacy BIOS not UEFI. >> >> Let me try with a legacy BIOS and see if I can repro. Might not be until >> tomorrow, though, since I had to let someone borrow the machine. > >I still encounter the issue using a legacy BIOS (SeaBIOS). I haven't had much time to play but have seen it with a stock kernel at least as far back as v5.0. They all triple-fault on bringing up secondary CPUs, on kexec. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
