Panic when starting X with Intel KMS

[Neel Natu]

Hi Michael,

On Mon, Jul 29, 2013 at 7:05 AM, Michael Butler
<imb at protected-networks.net> wrote:
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> I wrote:
>
>> Post SVN r252653, I have experienced a similar problem but I'm not sure
>> it's related ..
>
> This is related to SVN r252653 - reverting it solves the instances of
> the panic detailed below.
>
> The recent modification to amd64 addresses the issue but does nothing to
> help this CPU ..
>
> CPU: Genuine Intel(R) CPU           T2300  @ 1.66GHz (1662.53-MHz
> 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0x6e8  Family = 0x6  Model = 0xe
> Stepping = 8
>
> Features=0xbfe9fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Features2=0xc1a9<SSE3,MON,VMX,EST,TM2,xTPR,PDCM>
>   TSC: P-state invariant, performance statistics
>
>  .. which claims to have ..
>
> imb at toshi:/home/imb> sysctl vm.pmap
> vm.pmap.pv_entry_count: 627756
> vm.pmap.pde.promotions: 20165
> vm.pmap.pde.p_failures: 44416
> vm.pmap.pde.mappings: 0
> vm.pmap.pde.demotions: 19659
> vm.pmap.shpgperproc: 200
> vm.pmap.pv_entry_max: 2000208
> vm.pmap.pg_ps_enabled: 1
> vm.pmap.pat_works: 1
>
> Perhaps an equivalent patch to i386/pmap.c is appropriate here?
>

Let me take a look at the i386/pmap and get back to you.

best
Neel

>> root at toshi:/var/crash # less info.1
>> Dump header from device /dev/ada0s3b
>>   Architecture: i386
>>   Architecture Version: 2
>>   Dump Length: 205541376B (196 MB)
>>   Blocksize: 512
>>   Dumptime: Sat Jul 20 15:21:39 2013
>>   Hostname: toshi.auburn.protected-networks.net
>>   Magic: FreeBSD Kernel Dump
>>   Version String: FreeBSD 10.0-CURRENT #5 r253505M: Sat Jul 20 14:48:32
>> EDT 2013
>>     imb at toshi.auburn.protected-networks.net:/usr/obj/usr/src/sys/TOSHI
>>   Panic String: bad pte
>>   Dump Parity: 854235148
>>   Bounds: 1
>>   Dump Status: good
>>
>> root at toshi:/var/crash # kgdb /boot/kernel.old/kernel vmcore.1
>>
>>  [ snip ]
>>
>> #0  0xc07b814c in doadump ()
>> (kgdb) bt
>> #0  0xc07b814c in doadump ()
>> #1  0xc07b86ec in kern_reboot ()
>> #2  0xc07b8b68 in panic ()
>> #3  0xc0b20b1d in pmap_remove_pages ()
>> #4  0xc0aa43dd in vmspace_exit ()
>> #5  0xc07814bf in exit1 ()
>> #6  0xc07ba5d5 in sigexit ()
>> #7  0xc07bd35f in postsig ()
>> #8  0xc0804e1b in ast ()
>> #9  0xc0b132b7 in doreti_ast ()
>> #10 0xf1633d08 in ?? ()
>> #11 0x2c00003b in ?? ()
>> #
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