Server with Intel Xeon Gold 6230 fails to boot after upgrading to intel-microcode version 3.20220809.0ubuntu0.22.04.1

Empieza revisando el error de Launchpad enlazado y las dos versiones de intel-microcode mencionadas en el informe. Reproduce el bloqueo del arranque en la configuración con Intel Xeon Gold 6230, comparando el downgrade y la solución alternativa dis_ucode_ldr; se considera terminado cuando haya una corrección confirmada o una incompatibilidad documentada.

Boot process get stuck at booting SMP configuration. Can be solved by downgrading intel-microcode to version 3.20210608.2ubuntu1 or passing the kernel parameter dis_ucode_ldr

LP bug: https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/2002626

$ lscpu 
Architecture:            x86_64
  CPU op-mode(s):        32-bit, 64-bit
  Address sizes:         46 bits physical, 48 bits virtual
  Byte Order:            Little Endian
CPU(s):                  80
  On-line CPU(s) list:   0-79
Vendor ID:               GenuineIntel
  Model name:            Intel(R) Xeon(R) Gold 6230 CPU @ 2.10GHz
    CPU family:          6
    Model:               85
    Thread(s) per core:  2
    Core(s) per socket:  20
    Socket(s):           2
    Stepping:            7
    CPU max MHz:         3900,0000
    CPU min MHz:         800,0000
    BogoMIPS:            4200.00
    Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse3
                         6 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb r
                         dtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopolog
                         y nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx
                          smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2ap
                         ic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm a
                         bm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single ssbd mba
                          ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid e
                         pt_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm mpx rdt
                         _a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd 
                         avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc
                          cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts pku ospke avx512_
                         vnni md_clear flush_l1d arch_capabilities
Virtualization features: 
  Virtualization:        VT-x
Caches (sum of all):     
  L1d:                   1,3 MiB (40 instances)
  L1i:                   1,3 MiB (40 instances)
  L2:                    40 MiB (40 instances)
  L3:                    55 MiB (2 instances)
NUMA:                    
  NUMA node(s):          2
  NUMA node0 CPU(s):     0-19,40-59
  NUMA node1 CPU(s):     20-39,60-79
Vulnerabilities:         
  Itlb multihit:         KVM: Mitigation: VMX disabled
  L1tf:                  Not affected
  Mds:                   Not affected
  Meltdown:              Not affected
  Mmio stale data:       Vulnerable: Clear CPU buffers attempted, no microcode; SMT vulnerable
  Retbleed:              Mitigation; Enhanced IBRS
  Spec store bypass:     Mitigation; Speculative Store Bypass disabled via prctl and seccomp
  Spectre v1:            Mitigation; usercopy/swapgs barriers and __user pointer sanitization
  Spectre v2:            Mitigation; Enhanced IBRS, IBPB conditional, RSB filling, PBRSB-eIBRS 
                         SW sequence
  Srbds:                 Not affected
  Tsx async abort:       Mitigation; TSX disabled