[Bug 239678] System rebooted automatically

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239678

            Bug ID: 239678
           Summary: System rebooted automatically
           Product: Base System
           Version: 11.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jprokopowich at gmail.com

As per freenas support,

In the provided debug I see several identical core dumps, reporting crash on
Machine Check Exception:

MCA: Bank 0, Status 0xb4002000c0000145                                          
MCA: Global Cap 0x0000000000000106, Status 0x0000000000000007                   
MCA: Vendor "AuthenticAMD", ID 0x100f43, APIC ID 2                              
MCA: CPU 2 UNCOR DCACHE L1 DWR error                                            
MCA: Address 0x3840b0600                                                        
panic: Unrecoverable machine check exception                                    
cpuid = 2                                                                       
KDB: stack backtrace:                                                           
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe03d6da8e40  
vpanic() at vpanic+0x177/frame 0xfffffe03d6da8ea0                               
panic() at panic+0x43/frame 0xfffffe03d6da8f00                                  
mca_intr() at mca_intr+0x9b/frame 0xfffffe03d6da8f20                            
mchk_calltrap() at mchk_calltrap+0x8/frame 0xfffffe03d6da8f20                   
--- trap 0x1c, rip = 0xffffffff82a3c1db, rsp = 0xfffffe045bb246d0, rbp =
0xfffffe045bb247a0 ---                                         
svm_vmrun() at svm_vmrun+0x99b/frame 0xfffffe045bb247a0                         
vm_run() at vm_run+0x1fc/frame 0xfffffe045bb24880                               
vmmdev_ioctl() at vmmdev_ioctl+0x85f/frame 0xfffffe045bb24920                   
devfs_ioctl_f() at devfs_ioctl_f+0x128/frame 0xfffffe045bb24980                 
kern_ioctl() at kern_ioctl+0x26d/frame 0xfffffe045bb249f0                       
sys_ioctl() at sys_ioctl+0x15c/frame 0xfffffe045bb24ac0                         
amd64_syscall() at amd64_syscall+0xa38/frame 0xfffffe045bb24bf0                 
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe045bb24bf0     
--- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8017f281a, rsp =
0x7fffde7f1e28, rbp = 0x7fffde7f1ee0 ---                           
KDB: enter: panic          

Usually MCA panics are result of hardware issues. Considering that you are
running desktop hardware, I am not exactly surprised.  But what makes me worry
is that in all cases exception happened while system was executing virtual
machine, so it may be either a trigger (and I don't know much about AMD MCA) or
just unrelated witness, just because this system spends most of its CPU time
running VMs. 

You may try to report this issue to FreeBSD in case somebody really knows how
to decode AMD MCA.  But what I see now looks like checksum error in CPU L1
cache, which is a hardware problem.

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