MySQLd not coping with EINTR on read() during authentication

I have a problem with our MySQLd intermittently dropping the
connection during the initial handshake and login process.
The error message I get on the client is:

OperationalError: (2013, "Lost connection to MySQL server at 'reading
authorization packet', system error: 0")

On the server side, --debug shows:

vio_read: vio_error: Got error 4 during read
vio_read: exit: -1
?func: info: vio_read returned -1, errno: 4
?func: error: Couldn't read packet: remain: 4 errno: 4 length: -1

I am using the RHEL4 x86_64 RPMs from the mysql site.

I have made a bug report with further details here:

http://bugs.mysql.com/bug.php?id=28359

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