Bug#736198: undeterministic output when running egrep repeatedly with the same input

[Robert Millan]

On 20/01/2014 23:12, Robert Millan wrote:
> $ for i in $(seq 100) ; do egrep 
> '^#[[:space:]]*define[[:space:]]+MNT_[A-Z]+[[:space:]]+0x[0-9]+[[:space:]]*' 
> /usr/src/kfreebsd-headers-10.0-1/sys/sys/mount.h | grep MNT_RDONLY | head -n 
> 1 ; done | wc -l
> 72

Interestingly, when the receiving end of the pipe egrep writes to is not spawned
in each iteration, the chance of failure is much lower (but still non-zero):

$ for i in $(seq 100) ; do for i in $(seq 100) ; do egrep 
'^#[[:space:]]*define[[:space:]]+MNT_[A-Z]+[[:space:]]+0x[0-9]+[[:space:]]*' 
/usr/src/kfreebsd-headers-10.0-1/sys/sys/mount.h ; done | grep MNT_RDONLY | wc 
-l ; done
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-- 
Robert Millan


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