https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194974
Bug ID: 194974
Summary: Limit /dev/mem access to addresses in phys_avail[] -
i.e. actual memory
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Running a mismatched lsof on my ~10.1 desktop resulted in an MCA report and
hard hang:
MCA: Bank 1, Status 0xbf80000000200001
MCA: Global Cap 0x0000000000000c09, Status 0x0000000000000005
MCA: Vendor "GenuineIntel", ID 0x306a9, APIC ID 2
MCA: CPU 2 UNCOR PCC unclassified error
MCA: Address 0xfee00080
MCA: Misc 0x86
MCA: Bank 1, Status 0xbf80000000200001
MCA: Global Cap 0x0000000000000c09, Status 0x0000000000000005
MCA: Vendor "GenuineIntel", ID 0x306a9, APIC ID 3
MCA: CPU 3 UNCOR PCC unclassified error
MCA: Address 0xfee00080
MCA: Misc 0x86
Discussed with jhb@, presumably this happens after access to some device
register. We should by default limit /dev/mem access to addresses in
phys_avail[], but include a sysctl to enable such access for expert debugging.
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