New: Machine check exception 90000040000f0005 and kernel panic

https://bugzilla.kernel.org/show_bug.cgi?id=205313

            Bug ID: 205313
           Summary: Machine check exception 90000040000f0005 and kernel
                    panic
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.15.0-generic and 5.3.7-arch1-1-ARCH
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

When trying to run certain builds of the sv6 research OS as a guest kernel inside QEMU/KVM, the Linux *host* system reports some machine check exceptions and then kernel panics. The same behavior happens on both a Skylake Laptop running Arch (kernel 5.3.7-arch1-1-ARCH) and a Broadwell server running Ubuntu 18.04 (kernel 4.15.0-generic).

# Steps to reproduce

1) Download kernel.elf from
https://github.com/fintelia/sv6/releases/tag/mce-bug-2

2) Run qemu-system-x86_64 -nographic -enable-kvm -cpu qemu64,+fsgsbase -kernel kernel.elf

3) Once the guest boots, execute "ls" 5-10 times in rapid succession.

4) Observe that the entire system stops responding, perhaps printing some error messages about MCEs or kernel panics in the process.

# Example output

Running on a 4th Generation Lenovo X1 Carbon Laptop (with a i7-6600U) the following errors are recorded in the system log:

Oct 24 10:42:14 jonathan-ThinkPad-X1-Carbon kernel: L1TF CPU bug present and
SMT on, data leak possible. See CVE-2018-3646 and
https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for
details.
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon rasdaemon[614]: rasdaemon:
mce_record store: 0x56538e929050
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon kernel: mce_notify_irq: 1 callbacks
suppressed
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]:
Machine check events logged
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]: CPU
1: Machine Check: 0 Bank 0: 90000040000f0005
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]: TSC
a5db750d4d 
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]:
PROCESSOR 0:406e3 TIME 1571928139 SOCKET 0 APIC 2 microcode cc
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon rasdaemon[614]: rasdaemon: register
inserted at db
Oct 24 10:42:19 jonathan-ThinkPad-X1-Carbon rasdaemon[614]:            <...>-24
   [001]     0.000023: mce_record:           2019-10-24 10:42:19 -0400 bank=0,
status= 90000040000f0005, Internal parity error, mci=Corrected_error
Error_enabled, mca=Internal parity error, cpu_type= Intel generic architectural
MCA, cpu= 1, socketid= 0, mcgstatus=0, mcgcap= c08, apicid= 2
Oct 24 10:42:32 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]:
Machine check events logged
Oct 24 10:42:32 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]: CPU
1: Machine Check: 0 Bank 0: d0000040000f0005
Oct 24 10:42:32 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]: TSC
ae60fc6c1a 
Oct 24 10:42:32 jonathan-ThinkPad-X1-Carbon kernel: mce: [Hardware Error]:

PROCESSOR 0:406e3 TIME 1571928152 SOCKET 0 APIC 2 microcode cc

And afterwards there is a kernel panic that is printed to the screen but doesn't seem to be recorded anywhere:

Kernel panic - not syncing: Timeout: Not all CPUs entered broadcast exception

handler
Shutting down cpus with NMI
Kernel Offset: 0x2bc00000 from 0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 30 seconds...

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