LI75879: SIGNAL 11 IN IPA64 WITH -QIPA=LEVEL=0

June 2011 Update for XL C/C++ for Linux, V10.1
XL C/C++ for Linux Fix Pack 8 (January 2014 Update) for 10.1
January 2011 Update for XL C/C++ for Linux, V10.1
January 2012 Update for XL C/C++ for Linux, V10.1
July 2012 Update for XL C/C++ for Linux, V10.1

APAR status

• Closed as program error.

Error description

• IPA64 abends when using the -qipa=level=0 option for a specific
  large test case when compiled in the following mannaer:
  
  $ xlc -U__unix -q64 -qlonglong -qalign=natural -qldbl128
  -qtbtable=full -qhalt=e -qalias=noansi -qutf -qcpluscmt
  -qlanglvl=stdc89 -qlonglong -qfdpr -O -qstrict -qlibansi
  -qinlglue -qmaxmem=8192 -qarch=ppc -qspill=2048 -qarch=ppc -c
  dbtbxbuf.i -qipa=level=0
  /usr/vacpp/bin/.orig/xlc: 1501-224 (S) fatal error in
  usr/vac/exe/ipa64: signal 11 received
  $
  

Local fix

• N/A
  

Problem summary

• USERS AFFECTED:
  Any user using -O3 or above could potentially be affected by
  this issue.
  
  PROBLEM DESCRIPTION:
  During compilation, the compiler hits a segfault causing a
  signal 11 at compile time.
  The segfault is due to how the compiler does a shallow copy of
  certain internal expression nodes.
  When a shallow copy was being done, only partial nodes of an
  internal tree were being copied over,
  which resulted in the segfault.
  

Problem conclusion

• The problem has been fixed in the compiler by doing full copies
  instead of shallow copies so that all the nodes
  are copied over properly, thereby preventing the segfault.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IZ86209

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  XL C/C++ SLES10

• Fixed component ID

  5724U8300

Applicable component levels

• RA10 PSN IZ86209

     UP06/09/13