(gdb) bt
#0  0x0000000001fce090 in strchr ()
#1  0x00002b20557a2064 in PetscStrchr ()
   from /apps/petsc/3.1-p8//lib/libpetsc.so
#2  0x00002b205553dba1 in PetscGetHostName ()
   from /apps/petsc/3.1-p8//lib/libpetsc.so
#3  0x00002b205551c280 in PetscErrorPrintfInitialize ()
   from /apps/petsc/3.1-p8//lib/libpetsc.so
#4  0x00002b20556e47fc in PetscInitialize ()
   from /apps/petsc/3.1-p8//lib/libpetsc.so
#5  0x00000000005a3f7b in PetscInit (argc=4, argv=0x7fff80ce5938)
    at Usage.cpp:448
#6  0x000000000059b76f in main (argc=4, argv=0x7fff80ce5938) at main.cpp:82
(gdb)