Hello,

Latest intel-microcode update (3.20200609.2~deb10u1) renders my laptop (Dell
Latitude 7400) hang during the load of the initramfs.

Downgrading the package to 3.20191115.2~deb10u1 fixes the issue.

Excerpt from dmesg (with the old microcode):

[    0.986742] microcode: sig=0x806ec, pf=0x80, revision=0xca

Excerpt from /proc/cpuinfo:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 142
model name      : Intel(R) Core(TM) i5-8265U CPU @ 1.60GHz
stepping        : 12
microcode       : 0xca
cpu MHz         : 800.022
cache size      : 6144 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 22
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb
rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology
nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl
vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe
popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch
cpuid_fault epb invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow
vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms
invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves
dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear
flush_l1d arch_capabilities
bugs            : spectre_v1 spectre_v2 spec_store_bypass swapgs itlb_multihit
srbds
bogomips        : 3600.00
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:


Thanks.

Eugenio

Hi,

I confirm I have the same problem with the same laptop (Dell Latitude
7400).

Neither 3.20200609.1 nor 3.20200609.2 works here, I downgraded
to 3.20200520.1.

I don't have exactly the same cpu:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 142
model name      : Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
stepping        : 12
microcode       : 0xca
cpu MHz         : 1199.000
cache size      : 8192 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 22
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq
dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm
pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx
f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single
ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept
vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx
rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves
dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear
flush_l1d arch_capabilities
vmx flags       : vnmi preemption_timer invvpid ept_x_only ept_ad
ept_1gb flexpriority tsc_offset vtpr mtf vapic ept vpid
unrestricted_guest ple shadow_vmcs pml ept_mode_based_exec
bugs            : spectre_v1 spectre_v2 spec_store_bypass swapgs taa
itlb_multihit srbds
bogomips        : 4199.88
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

This laptop has got the latest firmwares from Dell (system firmware:
1.7.4).

I would raise the severity because the laptop can't boot with these
updates.

Regards,

Pierre

including several (on Ubuntu) about failures with 0xca...

Issue reported upstream at:
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/33

We will most likely have to revert this specific microcode update
(0x806ec), and very probably also its companion 0x906ec.

The one for 0x806ec is this:
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/24

Although the report upstream mentions hangs already with revision 0xca,
which contradicts this Debian bug report.  Might be separate issues.

With current firmware from Dell (1.9.1) and current intel-microcode
package, the problem is resolved.

# LANG=C lscpu
Architecture:                    x86_64
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Little Endian
Address sizes:                   39 bits physical, 48 bits virtual
CPU(s):                          8
On-line CPU(s) list:             0-7
Thread(s) per core:              2
Core(s) per socket:              4
Socket(s):                       1
NUMA node(s):                    1
Vendor ID:                       GenuineIntel
CPU family:                      6
Model:                           142
Model name:                      Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
Stepping:                        12
CPU MHz:                         2561.665
CPU max MHz:                     4800.0000
CPU min MHz:                     400.0000
BogoMIPS:                        4199.88
Virtualization:                  VT-x
L1d cache:                       128 KiB
L1i cache:                       128 KiB
L2 cache:                        1 MiB
L3 cache:                        8 MiB
NUMA node0 CPU(s):               0-7
Vulnerability Itlb multihit:     KVM: Mitigation: Split huge pages
Vulnerability L1tf:              Not affected
Vulnerability Mds:               Not affected
Vulnerability Meltdown:          Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass
disabled via prctl and seccomp
Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and
__user pointer sanitization
Vulnerability Spectre v2:        Mitigation; Enhanced IBRS, IBPB
conditional, RSB filling
Vulnerability Srbds:             Mitigation; TSX disabled
Vulnerability Tsx async abort:   Mitigation; TSX disabled
Flags:                           fpu vme de pse tsc msr pae mce cx8 apic
sep mtrr pge mca cmov pat pse36 clflush dts ac
                                 pi mmx fxsr sse sse2 ss ht tm pbe syscall
nx pdpe1gb rdtscp lm constant_tsc art arch_p
                                 erfmon pebs bts rep_good nopl xtopology
nonstop_tsc cpuid aperfmperf pni pclmulqdq dte
                                 s64 monitor ds_cpl vmx smx est tm2 ssse3
sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2
                                 apic movbe popcnt tsc_deadline_timer aes
xsave avx f16c rdrand lahf_lm abm 3dnowprefet
                                 ch cpuid_fault epb invpcid_single ssbd
ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi f
                                 lexpriority ept vpid ept_ad fsgsbase
tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx r
                                 dseed adx smap clflushopt intel_pt
xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln
                                 pts hwp hwp_notify hwp_act_window hwp_epp
md_clear flush_l1d arch_capabilities
# dmesg | grep micro
[    0.693997] microcode: sig=0x806ec, pf=0x80, revision=0xd6
[    0.694243] microcode: Microcode Update Driver: v2.2.
# dpkg -l | grep -E 'intel-microcode|linux-image-amd64'
ii  intel-microcode                               3.20200616.1
           amd64        Processor microcode firmware for Intel CPUs
ii  linux-image-amd64                             5.7.6-1
          amd64        Linux for 64-bit PCs (meta-package)

I guess this bug can be closed then?