unchecked MSR access error: WRMSR to 0xd84 (tried to write 0x0000000000010003) at rIP: 0xffffffffa025a1b8 (snbep_uncore_msr_init_box+0x38/0x60 [intel_uncore])

[Borislav Petkov]

Hi all,

sending this to a bunch of people who have touched this function
recently and some more relevant Intel folks.

The machine is an old SNB:

smpboot: CPU0: Intel(R) Xeon(R) CPU E5-1620 0 @ 3.60GHz (family: 0x6, model: 0x2d, stepping: 0x7)

and with latest linus/master + tip/master it gives the below.

It must be something new because 6.8-rc6 is fine.

..
i801_smbus 0000:00:1f.3: enabling device (0000 -> 0003)
input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input5
i801_smbus 0000:00:1f.3: SMBus using PCI interrupt
ACPI: button: Power Button [PWRF]
i2c i2c-14: 4/4 memory slots populated (from DMI)
unchecked MSR access error: WRMSR to 0xd84 (tried to write 0x0000000000010003) at rIP: 0xffffffffa025a1b8 (snbep_uncore_msr_init_box+0x38/0x60 [intel_uncore])
Call Trace:
 <TASK>
 ? ex_handler_msr+0xcb/0x130
 ? fixup_exception+0x166/0x320
 ? exc_general_protection+0xd7/0x3f0
 ? asm_exc_general_protection+0x22/0x30
 ? snbep_uncore_msr_init_box+0x38/0x60 [intel_uncore]
 uncore_box_ref.part.0+0x9c/0xc0 [intel_uncore]
 ? __pfx_uncore_event_cpu_online+0x10/0x10 [intel_uncore]
 uncore_event_cpu_online+0x56/0x140 [intel_uncore]
 ? __pfx_uncore_event_cpu_online+0x10/0x10 [intel_uncore]
 cpuhp_invoke_callback+0x174/0x5e0
 ? cpuhp_thread_fun+0x5a/0x200
 cpuhp_thread_fun+0x17e/0x200
 ? smpboot_thread_fn+0x2b/0x250
 smpboot_thread_fn+0x1ad/0x250
 ? __pfx_smpboot_thread_fn+0x10/0x10
 kthread+0xed/0x120
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x30/0x50
 ? __pfx_kthread+0x10/0x10
iTCO_vendor_support: vendor-support=0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
iTCO_wdt iTCO_wdt.1.auto: Found a Patsburg TCO device (Version=2, TCOBASE=0x0460)
iTCO_wdt iTCO_wdt.1.auto: initialized. heartbeat=30 sec (nowayout=0)
RAPL PMU: API unit is 2^-32 Joules, 2 fixed counters, 163840 ms ovfl timer
..

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette