linux-kernel - Re: [6.5.0-rc1] unchecked MSR access error: RDMSR from 0xe2 at rIP: 0xffffffff87090227 (native_read_msr+0x7/0x40) (intel_idle_init_cstates

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Date:   Tue, 11 Jul 2023 13:24:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bruno Goncalves <bgoncalv@...hat.com>
Cc:     arjan@...ux.intel.com, rafael.j.wysocki@...el.com, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [6.5.0-rc1] unchecked MSR access error: RDMSR from 0xe2 at rIP:
 0xffffffff87090227 (native_read_msr+0x7/0x40) (intel_idle_init_cstates_icpu)

On Tue, Jul 11, 2023 at 11:11:44AM +0200, Bruno Goncalves wrote:
> Hello Arjan and Rafael,
> 
> I'm not sure if you are the right person to contact about this, but
> we've noticed the following call trace when booting on KVM machines
> using kernel 6.5.0-rc1:
> 
> [    1.089740] io scheduler kyber registered
> [    1.091080] io scheduler bfq registered
> [    1.094696] atomic64_test: passed for x86-64 platform with CX8 and with SSE
> [    1.097371] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
> [    1.099559] unchecked MSR access error: RDMSR from 0xe2 at rIP:
> 0xffffffffa60912d7 (native_read_msr+0x7/0x40)
> [    1.102725] Call Trace:
> [    1.103547]  <TASK>
> [    1.104236]  ? ex_handler_msr+0x121/0x130
> [    1.105545]  ? fixup_exception+0x234/0x310
> [    1.106858]  ? gp_try_fixup_and_notify+0x1d/0xb0
> [    1.108342]  ? exc_general_protection+0x147/0x420
> [    1.109838]  ? pcpu_block_refresh_hint+0x87/0xb0
> [    1.111309]  ? asm_exc_general_protection+0x26/0x30
> [    1.112866]  ? native_read_msr+0x7/0x40
> [    1.114099]  intel_idle_init_cstates_icpu.constprop.0+0x762/0x7f0
> [    1.116063]  intel_idle_init+0x31b/0x4c0
> [    1.117315]  ? __pfx_intel_idle_init+0x10/0x10
> [    1.118734]  do_one_initcall+0x5a/0x320
> [    1.119981]  kernel_init_freeable+0x31b/0x470
> [    1.121373]  ? __pfx_kernel_init+0x10/0x10
> [    1.122681]  kernel_init+0x1a/0x1c0
> [    1.123796]  ret_from_fork+0x29/0x50
> [    1.124963]  </TASK>
> [    1.126012] input: Power Button as
> /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
> [    1.128477] ACPI: button: Power Button [PWRF]
> [    1.163767] ACPI: \_SB_.LNKB: Enabled at IRQ 10
> [    1.193831] ACPI: \_SB_.LNKC: Enabled at IRQ 11

You forgot to say on what host hardware, what qemu options and you
forgot to run the above through scripts/decode_stacktrace.sh.