Hi Thomas, On 2020-07-27 1:51 p.m., Thomas Gleixner wrote: > Scott, > > Scott Branden writes: > >> Occasionally I get the following Kernel panic on boot.  This is >> running on the latest kernel but have seen it previously as well. >> "Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with >> apic=debug and send a report." >> >> I don't know who I am support to send a report to.  But here is the log with apic=debug >> [    0.006000] ENABLING IO-APIC IRQs >> [    0.007000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 >> [    0.007000] ..MP-BIOS bug: 8254 timer not connected to IO-APIC >> [    0.007000] ...trying to set up timer (IRQ0) through the 8259A ... >> [    0.007000] ..... (found apic 0 pin 2) ... >> [    0.007000] ....... failed. >> [    0.007000] ...trying to set up timer as Virtual Wire IRQ... >> [    0.007000] ..... failed. >> [    0.007000] ...trying to set up timer as ExtINT IRQ... >> [    0.007000] ..... failed :(. >> [    0.007000] Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with apic=debug and send a report.  Then try booting with the 'noapic' option. > Nothing which rings a bell. Can you please provide a boot log from a > successful boot with apic=debug on the command line? boot log attached. > > Also you might check whether there are BIOS updates for this board. The > early Ryzen BIOSes had some rough edges. Will get someone to check for updates. It's a remote system so don't have direct access to the EFI Shell right now. > > Thanks, > > tglx > Thanks, Scott