[Bug 248659] random system freezes

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248659

rkoberman at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |rkoberman at gmail.com

--- Comment #3 from rkoberman at gmail.com ---
Seeing the same issue on my Lenovo L15 running current on a Comet Lake CPU.
Problem occurs in single-user mode and is mitigated by keyboard activity. This
is a regression as the problem does not occur on 12.1-RELEASE-P8. Problem has
occurred twice during boot, most recently after lo0 came up but before em0 or
rtwn were started. Happens when system is busy (compiles on all cores) or idle.
GENERIC-NODEBUG kernel except using SCHED_4BSD. Will shortly build
GENERIC-SCHED_4BSD.

System gets very warm after the freeze and then cools, probably due to the
firmware slowing the processor. This seems to indicate a possible loop in the
kernel.

As long as I keep the keyboard reasonably active, the system does not seem to
hang. While several times the freeze occurred when I was not closely watching
the system, I am not aware of the system staying up longer than 10 minutes.

When running in graphic mode (X11/MATE), it has frozen when I was typing on at
least one occasion. This could have been simple bad luck. Seems somewhat more
stable when in graphic mode. 

>From dmesg:
FreeBSD 13.0-CURRENT #2 r365481M: Tue Sep  8 20:16:02 PDT 2020
    root at ptavv:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG amd64
FreeBSD clang version 11.0.0 (git at github.com:llvm/llvm-project.git
llvmorg-11.0.0-rc2-0-g414f32a9e86)reeBSD clang version 11.0.0
(git at github.com:llvm/llvm-project.git llvmorg-11.0.0-rc2-0-g414f32a9e86)
VT(efifb): resolution 1920x1080
CPU: Intel(R) Core(TM) i5-10210U CPU @ 1.60GHz (2112.11-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0xa0660  Family=0x6  Model=0xa6  Stepping=0
 
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
 
Features2=0x7ffafbbf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,SDBG,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
  AMD Features2=0x121<LAHF,ABM,Prefetch>
  Structured Extended
Features=0x29c67af<FSGSBASE,TSCADJ,SGX,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,NFPUSG,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PROCTRACE>
  Structured Extended
Features3=0xbc000400<MD_CLEAR,IBPB,STIBP,L1DFL,ARCH_CAP,SSBD>
  XSAVE Features=0xf<XSAVEOPT,XSAVEC,XINUSE,XSAVES>
  IA32_ARCH_CAPS=0x2b<RDCL_NO,IBRS_ALL,SKIP_L1DFL_VME,MDS_NO>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
  TSC: P-state invariant, performance statistics
real memory  = 4294967296 (4096 MB)
avail memory = 3746226176 (3572 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table: <LENOVO TP-R17  >

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