Re: newly-detected (by valgrind) failure

[Jim Meyering]

Eric Blake wrote:
> On 03/29/2010 02:11 AM, Jim Meyering wrote:
>> This is on x86_64, which means we're using the included regex code:
>>
>>   printf '\357\274\241\n'>in; LC_ALL=en_US.UTF-8 valgrind src/grep $'\357' in

Hi Eric,

> Just noticing this mail; is there any chance that this might be related
> to the regex memory failure reported against m4 when building on AIX?
> Any progress on tracking it down?

I haven't looked further, since it seemed
like it could be triggered only in a contrived scenario.

For the record, from what I recall, this was reading memory
that was uninitialized only because one or both of the search
string or the first byte of input constitute an invalid mbchar.

>> I'm not planning to investigate this before the release,
>> but in case someone else has more time...
>>
>>   Conditional jump or move depends on uninitialised value(s)
>>      at 0x398F6E2617: iswalnum (wcfuncs.c:41)
>>      by 0x4202FD: peek_token (regcomp.c:1928)
>>      by 0x41FD9C: fetch_token (regcomp.c:1766)
>>      by 0x4208AB: parse (regcomp.c:2116)
>>      by 0x41D726: re_compile_internal (regcomp.c:816)
>>      by 0x41C712: rpl_re_compile_pattern (regcomp.c:237)
>>      by 0x402535: GEAcompile (dfasearch.c:156)
>>      by 0x40210B: Gcompile (grep.c:7)
>>      by 0x4074AA: main (main.c:2162)
>>
>>   Use of uninitialised value of size 8
>>      at 0x398F6E2630: iswalnum (wcfuncs.c:41)
>>      by 0x4202FD: peek_token (regcomp.c:1928)
>>      by 0x41FD9C: fetch_token (regcomp.c:1766)
>>      by 0x4208AB: parse (regcomp.c:2116)
>>      by 0x41D726: re_compile_internal (regcomp.c:816)
>>      by 0x41C712: rpl_re_compile_pattern (regcomp.c:237)
>>      by 0x402535: GEAcompile (dfasearch.c:156)
>>      by 0x40210B: Gcompile (grep.c:7)
>>      by 0x4074AA: main (main.c:2162)
>>
>>   Conditional jump or move depends on uninitialised value(s)
>>      at 0x420306: peek_token (regcomp.c:1928)
>>      by 0x41FD9C: fetch_token (regcomp.c:1766)
>>      by 0x4208AB: parse (regcomp.c:2116)
>>      by 0x41D726: re_compile_internal (regcomp.c:816)
>>      by 0x41C712: rpl_re_compile_pattern (regcomp.c:237)
>>      by 0x402535: GEAcompile (dfasearch.c:156)
>>      by 0x40210B: Gcompile (grep.c:7)
>>      by 0x4074AA: main (main.c:2162)