[Crash-utility] missing FP/SP in a crash dump

[Alok Aggarwal]

Greetings,

I'm trying to debug a crash dump with the 'crash'
utility but I'm running into the stack pointer and
frame pointer being absent from the stack backtrace.

A snippet of the dump is:

..

  #4 [ffff88084c969ef0] vfs_write at ffffffff8116d098
     ffff88084c969ef8: ffff88084c969f78 ffffffff810d42b2
     ffff88084c969f08: ffff88085b280660 ffff880858d5f240
     ffff88084c969f18: 00007f43f3d9d000 0000000000000002
     ffff88084c969f28: ffff88084c969f78 ffffffff8116dad1
  #5 [ffff88084c969f30] sys_write at ffffffff8116dad1
     ffff88084c969f38: ffff88084c969f78 00007f43f3d9d000
     ffff88084c969f48: 0000000000000000 0000000000000002
     ffff88084c969f58: 000000324b779780 0000000000000002
     ffff88084c969f68: 000000324b779780 0000000000000002
     ffff88084c969f78: 00007f43f3d9d000 ffffffff81013172

..

I'm doing this on RHEL6, specifically -

Linux cache7 2.6.32-71.14.1.el6.x86_64 #1 SMP Wed Jan 5 17:01:01 EST 2011 x86_64
x86_64 x86_64 GNU/Linux

Any ideas why my dump might be missing the info about
SP/FP?

Thanks,
Alok