[SOLVED][Goldmont Plus] Kernel panic when inserting corefreqk

[N0tACyb0rg]

System Info:

• CPU: Intel Pentium Silver N5000 @ 1.10 GHz
• RAM: 8 GB
• OS: Arch Linux
• Kernel: Linux 6.1.1-arch1-1
• CoreFreq Version: 1.94.0

I compiled from the develop branch with the provided make command for Intel systems: make MSR_CORE_PERF_UC=MSR_CORE_PERF_FIXED_CTR1 MSR_CORE_PERF_URC=MSR_CORE_PERF_FIXED_CTR2. I then attempted to insert corefreqk.ko using sudo insmod corefreqk.ko and got a kernel panic. I tried testing it by inserting it using the suggestion in #227, sudo insmod corefreqk.ko ArchID=11 and got a segmentation fault instead of a kernel panic. Here's the log for that from dmesg: pastebin.

[cyring]

According to the crash:

[  619.939065] RIP: 0010:BaseClock_Core+0xe/0x90 [corefreqk]
[  619.939109] RAX: ffffffffc18e0510 RBX: 000000000000000b RCX: 00000000000000cd

... MSR_FSB_FREQ (0x00000000000000cd) appears to be not supported on Goldmont Plus

Can you check its support as bellow ?

rdmsr -ax 0xcd

[cyring]

Can you also provide me the CPUID from /proc/cpuinfo ?

I just need cpu family model stepping model name from first CPU

[N0tACyb0rg]

Unfortunately it is not supported: rdmsr: CPU 0 cannot read MSR 0x000000cd

[N0tACyb0rg]

Here's the output of cat /proc/cpuinfo:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 122
model name      : Intel(R) Pentium(R) Silver N5000 CPU @ 1.10GHz
stepping        : 1
microcode       : 0x3c
cpu MHz         : 2647.387
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 24
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 cx16 xtpr pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave rdrand lahf_lm 3dnowprefetch cpuid_fault cat_l2 pti cdp_l2 ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust smep erms mpx rdt_a rdseed smap clflushopt intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts umip rdpid md_clear arch_capabilities
vmx flags       : vnmi preemption_timer posted_intr invvpid ept_x_only ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec tsc_scaling
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
bogomips        : 2189.00
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 122
model name      : Intel(R) Pentium(R) Silver N5000 CPU @ 1.10GHz
stepping        : 1
microcode       : 0x3c
cpu MHz         : 2586.523
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 1
cpu cores       : 4
apicid          : 2
initial apicid  : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 24
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 cx16 xtpr pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave rdrand lahf_lm 3dnowprefetch cpuid_fault cat_l2 pti cdp_l2 ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust smep erms mpx rdt_a rdseed smap clflushopt intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts umip rdpid md_clear arch_capabilities
vmx flags       : vnmi preemption_timer posted_intr invvpid ept_x_only ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec tsc_scaling
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
bogomips        : 2189.00
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 6
model           : 122
model name      : Intel(R) Pentium(R) Silver N5000 CPU @ 1.10GHz
stepping        : 1
microcode       : 0x3c
cpu MHz         : 2586.326
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 2
cpu cores       : 4
apicid          : 4
initial apicid  : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 24
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 cx16 xtpr pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave rdrand lahf_lm 3dnowprefetch cpuid_fault cat_l2 pti cdp_l2 ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust smep erms mpx rdt_a rdseed smap clflushopt intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts umip rdpid md_clear arch_capabilities
vmx flags       : vnmi preemption_timer posted_intr invvpid ept_x_only ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec tsc_scaling
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
bogomips        : 2189.00
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 122
model name      : Intel(R) Pentium(R) Silver N5000 CPU @ 1.10GHz
stepping        : 1
microcode       : 0x3c
cpu MHz         : 2586.694
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 3
cpu cores       : 4
apicid          : 6
initial apicid  : 6
fpu             : yes
fpu_exception   : yes
cpuid level     : 24
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 cx16 xtpr pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave rdrand lahf_lm 3dnowprefetch cpuid_fault cat_l2 pti cdp_l2 ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust smep erms mpx rdt_a rdseed smap clflushopt intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts umip rdpid md_clear arch_capabilities
vmx flags       : vnmi preemption_timer posted_intr invvpid ept_x_only ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec tsc_scaling
bugs            : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass
bogomips        : 2189.00
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

[cyring]

cpu family      : 6
model           : 122
model name      : Intel(R) Pentium(R) Silver N5000 CPU @ 1.10GHz
stepping        : 1

which make a CPUID 06_7A (hexa)

aka [Gemini Lake]

CoreFreq/corefreqk.h

Line 1825 in 5a84d5f

/* [Gemini Lake] 06_7Ah */

Entry starts here:

CoreFreq/corefreqk.h

Line 8731 in 5a84d5f

[Geminilake] = { /* 56*/

... and first access register is MSR_PLATFORM_INFO in function Query_Goldmont

CoreFreq/corefreqk.c

Line 6730 in 5a84d5f

static void Query_Goldmont(unsigned int cpu) /* Tables 2-6, 2-12 */

---

Question: can you access these registers ?

## MSR_PLATFORM_INFO
rdmsr -ax 0xCE

## MSR_IA32_APICBASE
rdmsr -ax 0x1B

## MSR_RAPL_POWER_UNIT
rdmsr -ax 0x606

## MSR_PKG_POWER_INFO
rdmsr -ax 0x614

[N0tACyb0rg]

MSR_PLATFORM_INFO: 40821f0010b00 x4
MSR_IA32_APICBASE:

fee00d00
fee00c00
fee00c00
fee00c00

MSR_RAPL_POWER_UNIT: 330a0e08 x4
MSR_PKG_POWER_INFO: 600 x4

[cyring]

I need the first crash log.

Can you please run again without ArchID. I mean just a basic insmod corefreqk.ko
then post the kernel log from RIP to </TASK>.

[N0tACyb0rg]

I couldn't recover an actual log since the kernel panicked, but here is a picture of my screen when I ran insmod on tty3:

[cyring]

Oh MSR_TURBO_ACTIVATION_RATIO is not available on GDM+

Can you try:

rdmsr -ax 0x64C

[N0tACyb0rg]

It cannot read that register.

[cyring]

In function PerCore_Goldmont_Query() of corefreqk.c file, please comment Intel_Turbo_Activation_Ratio

CoreFreq/corefreqk.c

Line 12017 in 5a84d5f

Intel_Turbo_Activation_Ratio(Core);

static void PerCore_Goldmont_Query(void *arg)
{
/*
	Intel_Turbo_Activation_Ratio(Core);
*/
}

Save, rebuild, try

make clean all
insmod corefreqk.ko

[N0tACyb0rg]

That resolved the issue! insmod worked immediately and CoreFreq is now working!

[cyring]

That resolved the issue! insmod worked immediately and CoreFreq is now working!

I believe it's the first time seeing CoreFreq with your architecture because this MSR is mentioned compatible since Goldmont (non Plus)

Do you have any option in BIOS which prevents from using it ?

[N0tACyb0rg]

I don't believe so. Intel TurboBoost is enabled.