Bug 62717

when reading a large file (a gigabyte image of a hard drive
                creating with strings(1)) using a simple shell loop such as
                'while [ 1 ]; do read a; echo $a; done < big-file',
                once every few 1000 lines, a directory listing (ls) of
                the current directory is echoed in the midst of the data.
                no pattern is detected - but it seems to occur more often
                after 40,000 lines or so have been read.
                this seems like a potentially very dangerous bug.

                this is an example of the output (with a line number):

                00070805: v+ file1 file2 file3 file4 file5 file6 file7
                          ^^ the listing seems to occur after short reads.
                00078682: jT| file1 file2 file3 file4 file5 file6 file7
                          ^^^
                00078701: file1 file2 file3 file4 file5 file6 file7 ]0
                          the carets denote actual data             ^^
                00079300: >u file4 file5
                          ^^ occasionally a deficient ls listing is output.

Fix: 

don't know - this would be very time consuming to debug.
How-To-Repeat: possibly create a large file as data for the loop given.
                possibly a Promise Ultra100 ATA card is required.