bug#13135: Loss of data while copying

[Cojocaru Alexandru]

bash$ yes $(for i in $(seq 1 100000); do echo -n a; done) | dd of=big-lines 
ibs=100001 count=10000
9924+76 records in
1951183+1 records out
*999005921* bytes (999 MB) copied, 21.6135 s, 46.2 MB/s

bash$ yes $(for i in $(seq 1 100000); do echo -n a; done) | dd of=big-lines 
ibs=100001 count=10000
9887+113 records in
1950792+1 records out
*998805894* bytes (999 MB) copied, 21.3409 s, 46.8 MB/s

bash$ yes $(for i in $(seq 1 100000); do echo -n a; done) | dd of=big-lines 
ibs=100001 count=10000
9890+110 records in
1950792+1 records out
*998805919* bytes (999 MB) copied, 21.5801 s, 46.3 MB/s

bash$ yes $(for i in $(seq 1 100000); do echo -n a; done) | dd of=big-lines 
ibs=100001 count=10000
9884+116 records in
1950011+1 records out
*998405915* bytes (998 MB) copied, 25.2695 s, 39.5 MB/s

WTF?!

Best regards,
Cojocaru Alexandru