Re: Fatal trap 12: page fault on Acer Chromebook 720 (peppy)

On Sun, Jun 03, 2018 at 02:48:40PM +0200, Michael Gmelin wrote:
> Hi,
> 
> After upgrading CURRENT to r333992 (from something at least a year
> old, quite some changes in mp_machdep.c since), this machine crashes
> on boot:
> 
> Copyright (c) 1992-2018 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> 	The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 12.0-CURRENT #1 r333992: Tue May 22 00:31:04 CEST 2018
>     root_at_flimsy:/usr/obj/usr/src/amd64.amd64/sys/flimsy amd64
> FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on LLVM 6.0.0)
> WARNING: WITNESS option enabled, expect reduced performance.
> VT(vga): resolution 640x480
> CPU: Intel(R) Celeron(R) 2955U _at_ 1.40GHz (1396.80-MHz K8-class CPU)
>   Origin="GenuineIntel"  Id=0x40651  Family=0x6  Model=0x45  Stepping=1
>   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=0x4ddaebbf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,SDBG,CX16,
> xTPR,PDCM,PCID,SSE4.1,SSE4.2,MOVBE,POPCNT,TSCDLT,XSAVE,OSXSAVE,RDRAND>
>   AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
>   AMD Features2=0x21<LAHF,ABM>
>   Structured Extended Features=0x2603<FSGSBASE,TSCADJ,ERMS,INVPCID,NFPUSG>
>   XSAVE Features=0x1<XSAVEOPT>
>   VT-x: (disabled in BIOS) PAT,HLT,MTF,PAUSE,EPT,UG,VPID
>   TSC: P-state invariant, performance statistics
> real memory  = 4301258752 (4102 MB)
> avail memory = 1907572736 (1819 MB)
> Event timer "LAPIC" quality 600
> ACPI APIC Table: <CORE   COREBOOT>
What does this mean ?  Did you flashed coreboot ?

> kernel trap 12 with interrupts disabled
> 
> Fatal trap 12: page fault while in kernel mode 
> cpuid = 0; apic id = 00
> fault virtual address    = 0xfffff80001000000
> fault code               = supervisor write data, protection violation
> instruction pointer      = 0x20:Oxffffffff8102955f
> stack pointer            = 0x28:0xffffffff82a79be0
> frame pointer            = 0x28:0xffffffff82a79c10
> code segment             = base Ox0, limit Oxfffff, type Ox1b
>                          = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags         = resume, IOPL = 0
> current process          = 0 ()
> [ thread pid 0 tid 0 ]
> Stopped at      native_start_all_aps+0x08f:      movq     %rax,(%rsi)
Look up the source line number for this address.

> db>
> 
> Any key press in the debugger will reboot the machine.
> 
> Booting with kern.smp.disabled=1 works.
> 
> Any ideas?
> 
> -m
> 
> -- 
> Michael Gmelin
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