Re: grep-3.8.11-908f on AIX 7.2

[Bruno Haible]

On AIX 7.2, with xlc as compiler, all tests pass.

BUT: On AIX 7.2, with xlclang as compiler, I'm seeing two test failures:

FAIL: empty-line
FAIL: skip-read

Find the logs attached.

Let me concentrate on the 'skip-read' test:

1) Line 12 'for file in /dev/null no-such-file; do' is merely a repetition,
since $file is never used. The test could be simplified by eliminating the
lines 12 and 17, I guess.

2) The 4 invocations that crash are:

$ src/grep -L -f /dev/null /dev/null > out
Trace/BPT trap (core dumped)
$ src/grep -L -f /dev/null -E /dev/null > out
Trace/BPT trap (core dumped)
$ src/grep -L -v "" /dev/null > out
Trace/BPT trap (core dumped)
$ src/grep -L -v "" -E /dev/null > out
Trace/BPT trap (core dumped)

The stack traces are, respectively:

(gdb) where
#0  dfamust (d=0x100011798 <dfaparse+280>) at ../../lib/dfa.c:4220
#1  0x0000000100010b4c in IPRA.$kwsmusts (dc=0x1000021a8 
<get_nondigit_option+136>) at ../../src/dfasearch.c:69
#2  0x00000001000104c8 in GEAcompile (pattern=0x9001000a0c01950 
<_ccq9xhiE.rw_+160> "", size=<unknown type>, syntax_bits=<unknown type>, 
exact=150999040) at ../../src/dfasearch.c:330
#3  0x0000000100001094 in main (argc=0, argv=0x0) at ../../src/grep.c:2975

(gdb) where
#0  dfamust (d=0x100011798 <dfaparse+280>) at ../../lib/dfa.c:4220
#1  0x0000000100010b4c in IPRA.$kwsmusts (dc=0x1000021a8 
<get_nondigit_option+136>) at ../../src/dfasearch.c:69
#2  0x00000001000104c8 in GEAcompile (pattern=0x9001000a0c01950 
<_ccq9xhiE.rw_+160> "", size=<unknown type>, syntax_bits=<unknown type>, 
exact=150999040) at ../../src/dfasearch.c:330
#3  0x0000000100001094 in main (argc=0, argv=0x0) at ../../src/grep.c:2975

(gdb) where
#0  dfamust (d=0x100011798 <dfaparse+280>) at ../../lib/dfa.c:4220
#1  0x0000000100010b4c in IPRA.$kwsmusts (dc=0x10004aae0 <fwrite+864>) at 
../../src/dfasearch.c:69
#2  0x00000001000104c8 in GEAcompile (pattern=0x9001000a0c01950 
<_ccq9xhiE.rw_+160> "", size=<unknown type>, syntax_bits=<unknown type>, 
exact=150999040) at ../../src/dfasearch.c:330
#3  0x0000000100001094 in main (argc=0, argv=0x0) at ../../src/grep.c:2975

(gdb) where
#0  dfamust (d=0x100011798 <dfaparse+280>) at ../../lib/dfa.c:4220
#1  0x0000000100010b4c in IPRA.$kwsmusts (dc=0x10004aae0 <fwrite+864>) at 
../../src/dfasearch.c:69
#2  0x00000001000104c8 in GEAcompile (pattern=0x9001000a0c01950 
<_ccq9xhiE.rw_+160> "", size=<unknown type>, syntax_bits=<unknown type>, 
exact=150999040) at ../../src/dfasearch.c:330
#3  0x0000000100001094 in main (argc=0, argv=0x0) at ../../src/grep.c:2975

3) Paul's fix from yesterday
  
<https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=8805a44cf04253f63bce160054e2fbf21ab9beb1>
does not fix the test failures.

4) Commenting out the _Noreturn marker before dfaerror does not fix the test
failures either.

5) But recompiling dfa.c with no optimizations (removing -O2 from CFLAGS)
fixes the test failures.

In summary, it looks like an xlclang compiler bug to me, that occurs when
compiling dfa.c, but I can't say where exactly.

Bruno

aix72-results.tar.gz
Description: application/compressed-tar