[Crash-utility] Re: backtrace problem with crash 0.2.18 on 2.6.14vanilia kernel ia64

[xb]

Dave Anderson wrote:

> Jun'ichi Nomura wrote:
>
>> Hi,
>>
>> Dave Anderson wrote:
>>  > Xavier also mentioned in a private email that "foreach bt" shows
>>  > nothing for all non-active tasks, so it appears that something has
>>  > changed affecting the ia64 unwind facility.  Has anybody else
>>  > running ia64 on 2.6.14 kernels seen this?
>>
>> While 'bt' just works on my 2.6.15 vanilla kernel (16KB-page),
>> I noticed Xavier used 64KB-page kernel but crash assumed
>> stacksize was 32KB.
>>
>>  > xb wrote:
>>  >>          pagesize: 65536
>> ...
>>  >>         stacksize: 32768
>>
>> Can this be a cause of the problem?
>> In kernel, the stack size is 64KB under 64KB-page.
>>  
>>
> Nice catch -- I didn't even notice his pagesize.  I should learn to
> look at my own debug code...
>
> Anyway, it sure looks like it could be the issue here.
>
> Xavier, please try something like this and let us know:
>
> --- ia64.c.orig 2006-01-10 14:07:07.000000000 -0500
> +++ ia64.c      2006-01-10 14:07:31.000000000 -0500
> @@ -92,6 +92,9 @@ ia64_init(int when)
>                 case 16384:
>                         machdep->stacksize = (power(2, 1) * PAGESIZE());
>                         break;
> +               case 65536:
> +                       machdep->stacksize = (power(2, 0) * PAGESIZE());
> +                       break;
>                 default:
>                         machdep->stacksize = 32*1024;
>                         break;
>
> Thanks again, Jun-ichi,
>   Dave
>  
>
>>  
>> In crash/ia64.c:ia64_init(),
>> ..
>>        case 4096:
>>                machdep->stacksize = (power(2, 3) * PAGESIZE());
>>                break;
>>        case 8192:
>>                machdep->stacksize = (power(2, 2) * PAGESIZE());
>>                break;
>>        case 16384:
>>                machdep->stacksize = (power(2, 1) * PAGESIZE());
>>                break;
>>        default:
>>                machdep->stacksize = 32*1024;
>>                break;
>> ..
>>
>> In include/asm-ia64/ptrace.h of kernel,
>>    #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
>>    # define KERNEL_STACK_SIZE_ORDER                3
>>    #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
>>    # define KERNEL_STACK_SIZE_ORDER                2
>>    #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
>>    # define KERNEL_STACK_SIZE_ORDER                1
>>    #else
>>    # define KERNEL_STACK_SIZE_ORDER                0
>>    #endif
>>
>> Thanks,
>> Jun'ichi "Nick" Nomura
>>
>> -- 
>> Crash-utility mailing list
>> Crash-utility at redhat.com
>> https://www.redhat.com/mailman/listinfo/crash-utility
>>
>------------------------------------------------------------------------
>
>--
>Crash-utility mailing list
>Crash-utility at redhat.com
>https://www.redhat.com/mailman/listinfo/crash-utility
>  
>
Hello Dave and Jun'ichi

With the patch it works fine !
Thanks again to all.

crash> bt 1
PID: 1      TASK: e000000101630000  CPU: 2   COMMAND: "init"
 #0 [BSP:e000000101631330] schedule at a000000100573740
 #1 [BSP:e0000001016312f8] schedule_timeout at a000000100576490
 #2 [BSP:e0000001016311c8] do_select at a000000100180610
 #3 [BSP:e0000001016310e8] sys_select at a000000100181030
 #4 [BSP:e0000001016310e8] ia64_ret_from_syscall at a00000010000b460
  EFRAME: e00000010163fe40
      B0: 4000000000009dd0      CR_IIP: a000000000010640
 CR_IPSR: 00001213081a6018      CR_IFS: 0000000000000005
  AR_PFS: c000000000000005      AR_RSC: 000000000000000f
 AR_UNAT: 0000000000000000     AR_RNAT: 0000000000000000
  AR_CCV: 0000000000000000     AR_FPSR: 0009804c8a70033f
  LOADRS: 0000000001080000 AR_BSPSTORE: 600fffff7fff00d0
      B6: 2000000000269800          B7: 0000000000000000
      PR: 0000000000026261          R1: 20000000002e0238
      R2: 0000000000000000          R3: ffffffffffff00e0
      R8: 8000000000000000          R9: 2000000000345340
     R10: 0000000000000000         R11: c000000000000a19
     R12: 600fffffffa0d590         R13: 2000000000044ce0
     R14: 20000000003410f0         R15: 0000000000000441
     R16: 0000000000000000         R17: 0000000000000000
     R18: 0000000000000000         R19: 0000000000000000
     R20: 0009804c8a70033f         R21: 4000000000009bf0
     R22: 0000000000000000         R23: 600fffff7fff00d0
     R24: 0000000000000000         R25: 0000000000000000
     R26: c00000000000020c         R27: 000000000000000f
     R28: a000000000010640         R29: 00001213081a6018
     R30: 0000000000000008         R31: 0000000000026261
      F6: 000000000000000000000     F7: 000000000000000000000
      F8: 000000000000000000000     F9: 000000000000000000000
     F10: 000000000000000000000    F11: 000000000000000000000
crash>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: xavier.bru.vcf
Type: text/x-vcard
Size: 304 bytes
Desc: not available
URL: <http://listman.redhat.com/archives/crash-utility/attachments/20060111/5959f8f9/attachment.vcf>