[Bug bootstrap/13906] New: genmodes.c:964: internal compiler error: Bus error in md5_process_block

["danglin at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

stage1/xgcc -Bstage1/ -B/opt/gnu/gcc/gcc-3.4/hppa2.0w-hp-hpux11.00/bin/ -c   -g 
-O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
 -pedantic -Wno-long-long -Wold-style-definition -Werror -fno-common   -DHAVE_CO
NFIG_H -DGENERATOR_FILE    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc
/gcc/../include  ../../gcc/gcc/genmodes.c -o genmodes.o
../../gcc/gcc/genmodes.c: In function `emit_mode_mask':
../../gcc/gcc/genmodes.c:964: internal compiler error: Bus error

The configure command was:

../gcc/configure --with-gnu-as --with-as=/opt/gnu/bin/as --enable-shared --with-
local-prefix=/opt/gnu --prefix=/opt/gnu/gcc/gcc-3.4 --enable-debug=no --disable-
nls --enable-checking="misc,tree,rtl,rtlflag,gc,gcac,fold" &&

The problem does not occur if `--enable-checking' is not specified.

The stack trace is:

Program received signal SIGBUS, Bus error.
md5_process_block (buffer=0x7aed3f6e, len=64, ctx=0x7eff1500)
at ../../gcc/libiberty/md5.c:325
325           OP (A, B, C, D,  7, (md5_uint32) 0xd76aa478);

#0  md5_process_block (buffer=0x7aed3f6e, len=64, ctx=0x7eff1500)
    at ../../gcc/libiberty/md5.c:325
#1  0x00af0064 in md5_process_bytes (buffer=0x7aed3fae, len=96, ctx=0x7eff1500)
    at ../../gcc/libiberty/md5.c:239
#2  0x00270b84 in fold_checksum_tree (expr=0x7aed3f00, ctx=0x7eff1500,
    ht=0x40079aa0) at ../../gcc/gcc/fold-const.c:8408
...

The fault occurs because of a misaligned load for a word:

0x00af0184 <md5_process_block+156>:     ldw 0(,r18),r20

(gdb) printf "0x%x\n",$r18
0x7aed3f6e

This is buffer address passed to md5_process_block from
md5_process_bytes.

The same error occurs on hppa-linux but the exception is
handled by the kernel unaligned handler.

-- 
           Summary: genmodes.c:964: internal compiler error: Bus error in
                    md5_process_block
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: danglin at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: hppa2.0-hp-hpux11.00
  GCC host triplet: hppa2.0-hp-hpux11.00
GCC target triplet: hppa2.0-hp-hpux11.00


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13906