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

On Sun, 3 Jun 2018 16:21:10 +0300
Konstantin Belousov <kostikbel_at_gmail.com> wrote:

> 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 ?

This machine comes with it by default (my model was delivered with 
SeaBIOS 20131018_145217-build121-m2). So I didn't flash anything
(didn't feel like bricking it).

> 
> > 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.
> 

I guess that's sys/amd64/amd64/support.S line 854 (in rdmsr), called by
native_start_all_aps. Any additional hints how I can track it down?

Thanks,
Michael

> > 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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-- 
Michael Gmelin