On 03/08/2018 08:21 AM, Brian Rak wrote: > We have some Dell servers running Intel Gold 6126 processors. Some of them > hang on boot under 4.15.7, but work fine on 4.14.14. When they hang, we see > the following on console: > > Error parsing PCC subspaces from PCCT > watchdog: BUG: soft lockup - CPU #16 stuck for 23s! [swapper/0:1] > > We see that PCC subspaces error under 4.14 as well, but it doesn't cause the > machine to hang. > > So far we haven't been able to correlate these hangs with anything in > particular. Some machines will hang, some machines will boot. They're > otherwise identical as far as hardware and firmware goes. > > I've tried pcie_aspm=off, since that seems to be the next bit of code that's > being executed. This resulted in the machine booting a little further, but > then oopsing somewhere in acpi_os_purge_cache. I'm not able to get a full > trace there, as I don't have serial access easily available. > > Any suggestions? >
Hi, The first thing that I would do is boot with: ignore_loglevel initcall_debug on the kernel boot command line. That will add lots of messages and maybe give us a stronger hint about where the hang is actually happening. And then worst case (without a boot log via serial console or netconsole) is to take a photo of the screen with the oops messages. And if you are fairly certain that it's an ACPI issue, also write to the [email protected] mailing list. -- ~Randy
