Re: Sporadic superfluous successful exits

[Aki Helin]

Jim Meyering <address@hidden> wrote:

> Aki Helin wrote:
>
> > [...]
> >  - Loop 1: 1 date
> >  - Loop 2: 4 dates
> >  - Loops 3 and 4 reading from stdin: 0 dates
> >
> > Machine 2, Dash, Grep 2.6.3
> >  - Loop 1: 0 dates
> >  - Loop 2: 1 segfault (will drop core next time if this happens again)
> >
> > Machine 3, Bash, Grep 2.10
> >  - Loop 1: 5 dates
> >  - Loop 2: 6 dates
> >  - Loop 3: 3 dates
> >  - Loop 4 reading from stdin: 0 dates
>
> Compiled with which compiler?

gcc (Debian 4.4.5-8) 4.4.5

The linker is GNU gold (GNU Binutils 2.21.1) 1.11 instead of the bundled
one, but I doubt that is related.


> Could it be that your Atom-based systems are sometimes too hot?

Good point. One of the machines does run pretty hot at +10C above the
others, but it hasn't printed any dates so far. Machine 3 above seems to
be running at same temperature as the others. Doesn't seem to be 
temperature related, but I'm logging them now to be sure.


> After 1.5 hours with zsh, and no output, I've switched to bash and dash
> in separate windows (it's a 4-core x86_64 system):
>   bash -c 'while :; do grep RANDOM cout.sh && date; done'
>   dash -c 'while :; do grep RANDOM cout.sh && date; done'

The intervals can be pretty long. One run (Bash and Grep 2.10) has:
 Thu Feb  9 00:35:59 EET 2012
 Thu Feb  9 01:00:28 EET 2012
 Thu Feb  9 06:35:02 EET 2012

One more data point: A date just got printed without issues even though
it was matching with Grep that had been patched to crash if it tries to
exit with 0 from the bottom of main().


-- 
Aki Helin