Bug#999502: Acknowledgement (linux-image-5.10.0-9-amd64: read from pty does not return newline on 64-byte boundaries)

[John Bazik]

Here's the output of the test program that we see under bullseye, kernel 
5.10.0.-9:

$ ./rbpty
TEST len 130 text 
[123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
]
    130 bytes read
    buf read: 
[123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
]
TEST len 129 text 
[12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
]
    128 bytes read
    1 bytes read
    buf read: 
[12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
]
TEST len 128 text 
[1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567
]
    128 bytes read
    buf read: 
[1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567
]
TEST len 66 text 
[12345678901234567890123456789012345678901234567890123456789012345
]
    66 bytes read
    buf read: [12345678901234567890123456789012345678901234567890123456789012345
]
TEST len 65 text 
[1234567890123456789012345678901234567890123456789012345678901234
]
    64 bytes read
    1 bytes read
    buf read: [1234567890123456789012345678901234567890123456789012345678901234
]
TEST len 64 text 
[123456789012345678901234567890123456789012345678901234567890123
]
    64 bytes read
    buf read: [123456789012345678901234567890123456789012345678901234567890123
]

And here is the output of the same program under buster, kernel 4.19.0-18:

$ src/rbpty
TEST len 130 text 
[123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
]
    130 bytes read
    buf read: 
[123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
]
TEST len 129 text 
[12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
]
    129 bytes read
    buf read: 
[12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
]
TEST len 128 text 
[1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567
]
    128 bytes read
    buf read: 
[1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567
]
TEST len 66 text 
[12345678901234567890123456789012345678901234567890123456789012345
]
    66 bytes read
    buf read: [12345678901234567890123456789012345678901234567890123456789012345
]
TEST len 65 text 
[1234567890123456789012345678901234567890123456789012345678901234
]
    65 bytes read
    buf read: [1234567890123456789012345678901234567890123456789012345678901234
]
TEST len 64 text 
[123456789012345678901234567890123456789012345678901234567890123
]
    64 bytes read
    buf read: [123456789012345678901234567890123456789012345678901234567890123
]

John