does NOT seem to be relevant:

CONFIG_CC_OPTIMIZE_FOR_SIZE
CONFIG_CRYPTO_ZLIB
CONFIG_FTRACE
CONFIG_LGUEST
CONFIG_LGUEST_GUEST
CONFIG_VIRTIO_CONSOLE
CONFIG_X86_GENERIC
CONFIG_X86_MCE_INJECT
CONFIG_X86_PPRO_FENCE
CONFIG_X86_REBOOTFIXUPS
CONFIG_X86_VERBOSE_BOOTUP
CONFIG_ZLIB_DEFLATE

something of it should be relevant:

CONFIG_APM is not set
CONFIG_BLK_DEV_INTEGRITY is not set
CONFIG_CC_STACKPROTECTOR is not set
CONFIG_CRYPTO_DEV_GEODE is not se
CONFIG_LOG_BUF_SHIFT=16
CONFIG_MEMTEST is not set
CONFIG_TOSHIBA is not set
CONFIG_VIRTIO=m
CONFIG_VMI is not set
CONFIG_X86_32_LAZY_GS=y
CONFIG_X86_CPU_DEBUG=m

diff of configs
===============

grml.00: error  -> like 2.6.31-grml

grml.01: OK     -> like sidux

grml.02: error  ->

  vimdiff config-grml.00 config-grml.02
  CONFIG_FTRACE is not set
  CONFIG_X86_VERBOSE_BOOTUP=y
  CONFIG_LGUEST is not set
  CONFIG_CRYPTO_ZLIB=m
  CONFIG_ZLIB_DEFLATE=m

grml.03: OK     ->

  vimdiff config-grml.00 config-grml.03
  CONFIG_X86_32_LAZY_GS=y
  CONFIG_LOG_BUF_SHIFT=16
  CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
  CONFIG_BLK_DEV_INTEGRITY is not set
  CONFIG_VMI is not set
  CONFIG_LGUEST_GUEST is not set
  CONFIG_MEMTEST is not set
  CONFIG_X86_GENERIC is not set
  CONFIG_X86_PPRO_FENCE is not set
  CONFIG_X86_MCE_INJECT=m
  CONFIG_TOSHIBA is not set
  CONFIG_X86_REBOOTFIXUPS is not set
  CONFIG_X86_CPU_DEBUG=m
  CONFIG_CC_STACKPROTECTOR is not set
  CONFIG_APM is not set
  CONFIG_VIRTIO_CONSOLE=m
  CONFIG_FTRACE is not set
  CONFIG_X86_VERBOSE_BOOTUP=y
  CONFIG_CRYPTO_ZLIB=m
  CONFIG_CRYPTO_DEV_GEODE is not se
  CONFIG_LGUEST is not se
  CONFIG_VIRTIO=m
  CONFIG_ZLIB_DEFLATE=m

grml.04: error  ->

  vimdiff config-grml.00 config-grml.04
  CONFIG_CC_OPTIMIZE_FOR_SIZE is not set

grml.05: error  ->

  vimdiff config-grml.00 config-grml.05
  CONFIG_LGUEST is not set
  CONFIG_VIRTIO_CONSOLE=m
  CONFIG_LGUEST_GUEST is not set

grml.06: error  ->

  vimdiff config-grml.00 config-grml.06
  CONFIG_FTRACE is not set
  CONFIG_X86_VERBOSE_BOOTUP=y

grml.07: error  ->

  vimdiff config-grml.00 config-grml.07
  CONFIG_ZLIB_DEFLATE=m
  CONFIG_CRYPTO_ZLIB=m
  CONFIG_X86_VERBOSE_BOOTUP=y

grml.08: error  ->

  vimdiff config-grml.00 config-grml.08
  CONFIG_X86_REBOOTFIXUPS is not set
  CONFIG_X86_MCE_INJECT=m
  CONFIG_X86_PPRO_FENCE is not set
  CONFIG_X86_GENERIC is not set