client and libmysqlclient VIO drops connection if signal received during read()

[Laurynas Biveinis]

On 5.5, ASan debug build fails very consistently with

main.mysqldump [ fail ]
...
--- /mnt/workspace/percona-server-5.5-asan-param/BUILD_TYPE/debug-asan/Host/ubuntu-xenial-64bit/mysql-test/r/mysqldump.result 2016-06-10 14:10:24.592739029 +0300
+++ /mnt/workspace/percona-server-5.5-asan-param/BUILD_TYPE/debug-asan/Host/ubuntu-xenial-64bit/mysql-test/r/mysqldump.reject 2016-06-10 14:16:34.749300315 +0300
@@ -4208,6 +4208,7 @@
 aberration
 drop table words;
 mysql-import: Error: 1146, Table 'test.words' doesn't exist, when using table: words
+mysql-import: Error: 2013 Lost connection to MySQL server at 'reading authorization packet', system error: 4
 drop table t1;
 drop table t2;
 drop table words2;

[Laurynas Biveinis (laurynas-biveinis)]

https://github.com/percona/percona-server/pull/617, https://github.com/percona/percona-server/pull/618, https://github.com/percona/percona-server/pull/619

[Yura Sorokin (yura-sorokin)]

Fixed by Oracle in 5.5.52

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-1720