Paul! On Mon, Apr 17 2023 at 13:19, Paul Menzel wrote: > Am 15.04.23 um 01:44 schrieb Thomas Gleixner: > [ 0.258193] smpboot: CPU0: AMD A6-6400K APU with Radeon(tm) HD > Graphics (family: 0x15, model: 0x13, stepping: 0x1) > […] > [ 0.259329] smp: Bringing up secondary CPUs ... > [ 0.259527] x86: Booting SMP configuration: > [ 0.259528] .... node #0, CPUs: #1 > [ 0.261007] After schedule_preempt_disabled > [ 10.260990] CPU1 failed to report alive state Weird. CPU1 fails to come up and report that it has reached the synchronization point. Does it work when you add cpuhp.parallel=off on the kernel command line? Thanks, tglx