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Re: [Xen-users] Xen 4.12.1/4.13.0-rc2 unable to load module coretemp



Am 16.11.19 um 04:21 schrieb Rishi:
On Sat, Nov 16, 2019 at 4:29 AM Bobbi Sanchez <bobbisanchez@xxxxxx> wrote:
Hi,


i am using (Debian10) Kernel 5.3.7-amd64 self compiled with XEN-dom0 Options 
activated and also Xen from source Version 4.12.1 and 4.13.0-rc2 self compiled, 
everything seems to work find but i am not able to load the coretemp.ko module, 
not possible under Xen4.12.1 and 4.13.0-rc2!

If i dont load the xen.gz at boot, so that i only run Kernel 5.3.7 coretemp is 
no problem to load!


Thats the output if i try to load the coretemp module:

sudo modprobe -vvvvv coretemp
modprobe: INFO: ../libkmod/libkmod.c:364 kmod_set_log_fn() custom logging 
function 0x56006c91c150 registered
modprobe: DEBUG: ../libkmod/libkmod-index.c:755 index_mm_open() 
file=/lib/modules/5.3.7-4-xen0/modules.dep.bin
modprobe: DEBUG: ../libkmod/libkmod-index.c:755 index_mm_open() 
file=/lib/modules/5.3.7-4-xen0/modules.alias.bin
modprobe: DEBUG: ../libkmod/libkmod-index.c:755 index_mm_open() 
file=/lib/modules/5.3.7-4-xen0/modules.symbols.bin
modprobe: DEBUG: ../libkmod/libkmod-index.c:755 index_mm_open() 
file=/lib/modules/5.3.7-4-xen0/modules.builtin.bin
modprobe: DEBUG: ../libkmod/libkmod-module.c:556 kmod_module_new_from_lookup() 
input alias=coretemp, normalized=coretemp
modprobe: DEBUG: ../libkmod/libkmod-module.c:562 kmod_module_new_from_lookup() 
lookup modules.dep coretemp
modprobe: DEBUG: ../libkmod/libkmod.c:574 kmod_search_moddep() use mmaped index 
'modules.dep' modname=coretemp
modprobe: DEBUG: ../libkmod/libkmod.c:402 kmod_pool_get_module() get module 
name='coretemp' found=(nil)
modprobe: DEBUG: ../libkmod/libkmod.c:410 kmod_pool_add_module() add 
0x56006d416f20 key='coretemp'
modprobe: DEBUG: ../libkmod/libkmod-module.c:202 kmod_module_parse_depline() 0 
dependencies for coretemp
modprobe: DEBUG: ../libkmod/libkmod-module.c:583 kmod_module_new_from_lookup() 
lookup coretemp=0, list=0x56006d4166d0
modprobe: DEBUG: ../libkmod/libkmod.c:501 lookup_builtin_file() use mmaped 
index 'modules.builtin' modname=coretemp
modprobe: DEBUG: ../libkmod/libkmod-module.c:1750 kmod_module_get_initstate() 
could not open '/sys/module/coretemp/initstate': No such file or directory
modprobe: DEBUG: ../libkmod/libkmod-module.c:1760 kmod_module_get_initstate() 
could not open '/sys/module/coretemp': No such file or directory
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=snd_pcsp mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=snd_usb_audio mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=cx88_alsa mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=snd_atiixp_modem mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=snd_intel8x0m mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=snd_via82xx_modem mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=loop mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=bonding mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1393 kmod_module_get_options() 
modname=dummy mod->name=coretemp mod->alias=(null)
modprobe: DEBUG: ../libkmod/libkmod-module.c:1750 kmod_module_get_initstate() 
could not open '/sys/module/coretemp/initstate': No such file or directory
modprobe: DEBUG: ../libkmod/libkmod-module.c:1760 kmod_module_get_initstate() 
could not open '/sys/module/coretemp': No such file or directory
modprobe: DEBUG: ../libkmod/libkmod-module.c:744 kmod_module_get_path() 
name='coretemp' 
path='/lib/modules/5.3.7-4-xen0/kernel/drivers/hwmon/coretemp.ko'
modprobe: DEBUG: ../libkmod/libkmod-module.c:744 kmod_module_get_path() 
name='coretemp' 
path='/lib/modules/5.3.7-4-xen0/kernel/drivers/hwmon/coretemp.ko'
insmod /lib/modules/5.3.7-4-xen0/kernel/drivers/hwmon/coretemp.ko
modprobe: DEBUG: ../libkmod/libkmod-module.c:744 kmod_module_get_path() 
name='coretemp' 
path='/lib/modules/5.3.7-4-xen0/kernel/drivers/hwmon/coretemp.ko'
modprobe: INFO: ../libkmod/libkmod-module.c:886 kmod_module_insert_module() 
Failed to insert module 
'/lib/modules/5.3.7-4-xen0/kernel/drivers/hwmon/coretemp.ko': No such device
modprobe: ERROR: could not insert 'coretemp': No such device
modprobe: DEBUG: ../libkmod/libkmod-module.c:468 kmod_module_unref() 
kmod_module 0x56006d416f20 released
modprobe: DEBUG: ../libkmod/libkmod.c:418 kmod_pool_del_module() del 
0x56006d416f20 key='coretemp'
modprobe: INFO: ../libkmod/libkmod.c:331 kmod_unref() context 0x56006d4164e0 
released


The Module is there:

ls -hal /lib/modules/5.3.7-4-xen0/kernel/drivers/hwmon/ | grep coretemp
-rw-r--r--  1 root root  21K Nov 15 00:55 coretemp.ko


Thats the xl info:

sudo xl info
host                   : nanadag
release                : 5.3.7-4-xen0
version                : #0 SMP PREEMPT Fri Nov 15 00:55:59 CET 2019
machine                : x86_64
nr_cpus                : 4
max_cpu_id             : 3
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2397.616
hw_caps                : 
bfebfbff:0000e3bd:20100800:00000001:00000000:00000000:00000000:00000000
virt_caps              : pv hvm shadow
total_memory           : 7101
free_memory            : 128
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 13
xen_extra              : .0-rc
xen_version            : 4.13.0-rc
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit2
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : placeholder
cc_compiler            : gcc (Debian 8.3.0-6) 8.3.0
cc_compile_by          : benutzer
cc_compile_domain      : dag
cc_compile_date        : Fri Nov 15 22:15:27 CET 2019
build_id               : ded65a38fabc4057e67d85d1bf6bf4165e88b6ca
xend_config_format     : 4


uname -a
Linux nanadag 5.3.7-4-xen0 #0 SMP PREEMPT Fri Nov 15 00:55:59 CET 2019 x86_64 
GNU/Linux

and here from cat /proc/cpuinfo

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
stepping        : 11
cpu MHz         : 2397.616
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     : 10
wp              : yes
flags           : fpu de tsc msr pae mce cx8 apic sep mca cmov pat clflush acpi 
mmx fxsr sse sse2 ht syscall nx lm constant_tsc rep_good nopl cpuid pni monitor 
est ssse3 cx16 hypervisor lahf_lm
bugs            : null_seg cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass 
l1tf mds swapgs
bogomips        : 4795.23
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:
--- snip ---


What can i do to ge the coretemp module loaded ?

Best Regards


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This change of behavior was introduced with
https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=72e038450d3d5de1a39f0cfa2d2b0f9b3d43c6c6
It was intended to hide Thermal info from PV guests but seems it got
hidden from Dom0 as well.

I was having same problem and there are 2 ways through which it could
be solved. Modify Xen to not hide EAX or modify linux Dom0 kernel.
To modify dom0 kernel, you'd have to edit
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/kernel/cpu/common.c?h=v5.3.7#n913
-               c->x86_capability[CPUID_6_EAX] = cpuid_eax(0x00000006);
+               c->x86_capability[CPUID_6_EAX] = native_cpuid_eax(0x00000006);

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Thanks for your information,

i tried to change common.c inside of the kernel 5.3.7 sources but now dmesg 
prints this while booting the system with xen 4.13.0-rc2:

[   13.090126] coretemp coretemp.0: Using relative temperature scale!
[   13.090208] coretemp coretemp.0: Using relative temperature scale!
[   13.090219] sysfs: cannot create duplicate filename 
'/devices/platform/coretemp.0/hwmon/hwmon0/temp2_label'
[   13.090221] CPU: 1 PID: 14 Comm: cpuhp/1 Not tainted 5.3.7-3-xen0-amd64 #0
[   13.090223] Hardware name:  /DP965LT, BIOS MQ96510J.86A.1761.2009.0326.0001 
03/26/2009
[   13.090224] Call Trace:
[   13.090234]  dump_stack+0x5c/0x80
[   13.090237]  sysfs_warn_dup.cold.5+0x17/0x23
[   13.090240]  sysfs_add_file_mode_ns+0x144/0x170
[   13.090242]  internal_create_group+0x117/0x380
[   13.090248]  ? coretemp_cpu_offline+0x1d0/0x1d0 [coretemp]
[   13.090250]  create_core_data+0x34d/0x550 [coretemp]
[   13.090253]  ? create_core_data+0x550/0x550 [coretemp]
[   13.090256]  coretemp_cpu_online+0x114/0x16f [coretemp]
[   13.090259]  ? finish_task_switch+0x77/0x230
[   13.090261]  cpuhp_invoke_callback+0x94/0x540
[   13.090264]  ? __schedule+0x2be/0x630
[   13.090266]  ? sort_range+0x20/0x20
[   13.090267]  cpuhp_thread_fun+0xb0/0x110
[   13.090269]  smpboot_thread_fn+0xc5/0x160
[   13.090271]  kthread+0x113/0x130
[   13.090273]  ? __kthread_parkme+0x70/0x70
[   13.090275]  ret_from_fork+0x35/0x40
[   13.090283] coretemp coretemp.0: Adding Core 1 failed
[   13.100454] coretemp coretemp.0: Using relative temperature scale!
[   13.100501] coretemp coretemp.0: Using relative temperature scale!
[   13.100510] sysfs: cannot create duplicate filename 
'/devices/platform/coretemp.0/hwmon/hwmon0/temp2_label'
[   13.100513] CPU: 3 PID: 24 Comm: cpuhp/3 Not tainted 5.3.7-3-xen0-amd64 #0
[   13.100514] Hardware name:  /DP965LT, BIOS MQ96510J.86A.1761.2009.0326.0001 
03/26/2009
[   13.100515] Call Trace:
[   13.100524]  dump_stack+0x5c/0x80
[   13.100527]  sysfs_warn_dup.cold.5+0x17/0x23
[   13.100531]  sysfs_add_file_mode_ns+0x144/0x170
[   13.100532]  internal_create_group+0x117/0x380
[   13.100536]  ? coretemp_cpu_offline+0x1d0/0x1d0 [coretemp]
[   13.100539]  create_core_data+0x34d/0x550 [coretemp]
[   13.100542]  ? create_core_data+0x550/0x550 [coretemp]
[   13.100544]  coretemp_cpu_online+0x114/0x16f [coretemp]
[   13.100547]  ? finish_task_switch+0x77/0x230
[   13.100549]  cpuhp_invoke_callback+0x94/0x540
[   13.100552]  ? __schedule+0x2be/0x630
[   13.100554]  ? sort_range+0x20/0x20
[   13.100555]  cpuhp_thread_fun+0xb0/0x110
[   13.100557]  smpboot_thread_fn+0xc5/0x160
[   13.100559]  kthread+0x113/0x130
[   13.100561]  ? __kthread_parkme+0x70/0x70
[   13.100563]  ret_from_fork+0x35/0x40
[   13.100571] coretemp coretemp.0: Adding Core 3 failed


lsmod shows that coretemp is loaded

$ lsmod | grep coretemp
coretemp               20480  0

but lmsensors doenst show temperature, even if i try sudo sensors-detect

$ sensors
No sensors found!
Make sure you loaded all the kernel drivers you need.
Try sensors-detect to find out which these are.

if i try to

$ sudo rmmod coretemp

the input hangs and cannot be breaked/canceled, even not CTRL+C or CTRL+Z, or 
CTRL+D doesnt work, and then on another console dmesg prints this:

[  425.193352] BUG: kernel NULL pointer dereference, address: 0000000000000188
[  425.207238] #PF: supervisor read access in kernel mode
[  425.217475] #PF: error_code(0x0000) - not-present page
[  425.227713] PGD 0 P4D 0
[  425.232759] Oops: 0000 [#1] SMP NOPTI
[  425.240056] CPU: 0 PID: 13 Comm: cpuhp/0 Not tainted 5.3.7-3-xen0-amd64 #0
[  425.253757] Hardware name:  /DP965LT, BIOS MQ96510J.86A.1761.2009.0326.0001 
03/26/2009
[  425.269541] RIP: e030:sysfs_remove_group+0xc/0x80
[  425.278919] Code: 66 66 90 48 89 f2 be 01 00 00 00 e9 5e fc ff ff 66 66 2e 0f 1f 
84 00 00 00 00 00 0f 1f 00 66 66 66 66 90 41 54 55 48 89 f5 53 <48> 8b 36 48 8b 5f 
30 48 85 f6 74 40 31 d2 49 89 fc 48 89 df e8 1b
[  425.316343] RSP: e02b:ffffc9004009fe08 EFLAGS: 00010216
[  425.326752] RAX: 0000000000000000 RBX: ffff8881b6aa6828 RCX: 0000000000000000
[  425.340982] RDX: 0000000000000007 RSI: 0000000000000188 RDI: ffff8881b6018008
[  425.355201] RBP: 0000000000000188 R08: 0000000000000000 R09: ffff8881b9a2aa00
[  425.369422] R10: 0000000000007ff0 R11: 0000000000000400 R12: 0000000000000000
[  425.383641] R13: ffff8881b6aa6818 R14: 0000000000010340 R15: ffff8881b6aa6828
[  425.397873] FS:  00007f5c585e8940(0000) GS:ffff8881be800000(0000) 
knlGS:0000000000000000
[  425.414000] CS:  e030 DS: 0000 ES: 0000 CR0: 0000000080050033
[  425.425450] CR2: 0000000000000188 CR3: 00000001b58d4000 CR4: 0000000000000660
[  425.439675] Call Trace:
[  425.444552]  coretemp_cpu_offline+0x120/0x1d0 [coretemp]
[  425.455140]  ? coretemp_remove+0x60/0x60 [coretemp]
[  425.464862]  cpuhp_invoke_callback+0x94/0x540
[  425.473543]  ? __schedule+0x2be/0x630
[  425.480840]  ? sort_range+0x20/0x20
[  425.487789]  cpuhp_thread_fun+0xb0/0x110
[  425.495604]  smpboot_thread_fn+0xc5/0x160
[  425.503592]  kthread+0x113/0x130
[  425.510021]  ? __kthread_parkme+0x70/0x70
[  425.518009]  ret_from_fork+0x35/0x40
[  425.525131] Modules linked in: bridge stp llc mei_me iTCO_wdt sg mei 
serio_raw iTCO_vendor_support pcspkr evdev button xen_acpi_processor xen_netback 
xen_blkback xen_gntalloc coretemp(-) ip_tables x_tables autofs4 ext4 crc32c_generic 
crc16 mbcache jbd2 sd_mod ata_generic pata_acpi i2c_i801 ahci lpc_ich libahci skge 
uhci_hcd ehci_pci pata_marvell ehci_hcd libata usbcore e1000e
[  425.591494] CR2: 0000000000000188
[  425.598096] ---[ end trace e7bf697ded5c8bcf ]---
[  425.607296] RIP: e030:sysfs_remove_group+0xc/0x80
[  425.616668] Code: 66 66 90 48 89 f2 be 01 00 00 00 e9 5e fc ff ff 66 66 2e 0f 1f 
84 00 00 00 00 00 0f 1f 00 66 66 66 66 90 41 54 55 48 89 f5 53 <48> 8b 36 48 8b 5f 
30 48 85 f6 74 40 31 d2 49 89 fc 48 89 df e8 1b
[  425.654094] RSP: e02b:ffffc9004009fe08 EFLAGS: 00010216
[  425.664507] RAX: 0000000000000000 RBX: ffff8881b6aa6828 RCX: 0000000000000000
[  425.678729] RDX: 0000000000000007 RSI: 0000000000000188 RDI: ffff8881b6018008
[  425.692951] RBP: 0000000000000188 R08: 0000000000000000 R09: ffff8881b9a2aa00
[  425.707184] R10: 0000000000007ff0 R11: 0000000000000400 R12: 0000000000000000
[  425.721404] R13: ffff8881b6aa6818 R14: 0000000000010340 R15: ffff8881b6aa6828
[  425.735627] FS:  00007f5c585e8940(0000) GS:ffff8881be800000(0000) 
knlGS:0000000000000000
[  425.751754] CS:  e030 DS: 0000 ES: 0000 CR0: 0000000080050033
[  425.763204] CR2: 0000000000000188 CR3: 00000001b58d4000 CR4: 0000000000000660


and lsmod shows now:

$ lsmod | grep coretemp
coretemp               20480  -1

Well lets see may the other way what you talked about the change the xen source 
may work... lets see. I will try this way now

Best Regards


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