On Mon, May 27 2024 at 09:29, Peter Schneider wrote: > This is coming from an older server machine: 2-socket Ivy Bridge Xeon E5-2697 v2 (24C/48T) > in an Asus Z9PE-D16/2L motherboard (Intel C-602A chipset); BIOS patched to the latest > available from Asus. All memory slots occupied, so 256 GB RAM in total. > > From a "good boot", e.g. kernel 6.8.11, dmesg output looks like this: > > [ 1.823797] smpboot: x86: Booting SMP configuration: > [ 1.823799] .... node #0, CPUs: #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 > [ 1.827514] .... node #1, CPUs: #12 #13 #14 #15 #16 #17 #18 #19 #20 #21 #22 #23 > [ 0.011462] smpboot: CPU 12 Converting physical 0 to logical die 1 > > [ 1.875532] .... node #0, CPUs: #24 #25 #26 #27 #28 #29 #30 #31 #32 #33 #34 #35 > [ 1.882453] .... node #1, CPUs: #36 #37 #38 #39 #40 #41 #42 #43 #44 #45 #46 #47 > [ 1.887532] MDS CPU bug present and SMT on, data leak possible. See > https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details. > [ 1.933640] smp: Brought up 2 nodes, 48 CPUs > [ 1.933640] smpboot: Max logical packages: 2 > [ 1.933640] smpboot: Total of 48 processors activated (259199.61 BogoMIPS) > > > From a "bad" boot, e.g. kernel 6.9.2, dmesg output has these messages in it: > > [ 1.785937] smpboot: x86: Booting SMP configuration: > [ 1.785939] .... node #0, CPUs: #4 > [ 1.786215] .... node #1, CPUs: #12 #16 Yuck. That does not make any sense. > [ 1.797547] .... node #0, CPUs: #1 #2 #3 #5 #6 #7 #8 #9 #10 #11 > [ 1.801858] .... node #1, CPUs: #13 #14 #15 #17 #18 #19 #20 #21 #22 #23 > [ 1.804687] .... node #0, CPUs: #24 #25 #26 #27 #28 #29 #30 #31 #32 #33 #34 #35 > [ 1.810728] .... node #1, CPUs: #36 #37 #38 #39 #40 #41 #42 #43 #44 #45 #46 #47 > However the machine boots, and except from these strange messages, I cannot detect any > other abnormal behaviour. It is running ~15 QEMU/KVM virtual machines just fine. Because > these messages look unusual and a bit scary though, I have bisected the issue, to be able > to report it here. The first bad commit I found is this one: Ok. So as the machine is booting, can you please provide the output of: cat /sys/kernel/debug/x86/topo/cpus/* on the 6.9 kernel and cat /proc/cpuinfo for both 6.8 and 6.9? Thanks, tglx
