Re: Race condition in read -t

[Chet Ramey]

On 8/28/15 7:52 PM, Oleg Popov wrote:

> Description:
>       Function reset_alarm() in read.def first resets SIGALRM handler and
>       then cancels alarm. Sometimes, SIGALRM comes between those 2 calls and
>       crashes (sub)shell.
> 
> Repeat-By:
>       while sleep 0.00$RANDOM; do echo test; done | while true; do read -t 
> 0.00$RANDOM; echo $REPLY; done
>       (usually takes a few seconds to crash, sometimes minutes)
> 
> Fix:
>       Swap the lines in reset_alarm().

Thanks for the report.  This will be fixed in the next release of bash.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/