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

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  Bug#999502: Acknowledgement (linux-image-5.10.0-9-amd64: read from pty does not return newline on 64-byte boundaries) John Bazik <john_bazik@brown.edu> - 2021-11-12 04:10 +0100

#73656 — Bug#999502: Acknowledgement (linux-image-5.10.0-9-amd64: read from pty does not return newline on 64-byte boundaries)

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

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