To reproduce the bug, launch a mysqldump with the --dump-slave option on a server it cannot connect or execute a "SHOW SLAVE STATUS" :
# mysqldump -hunknownhost --dump-slave nulldb
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mysqldump: Got error: 2005: "Unknown MySQL server host 'unknownhost' (0)" when trying to connect
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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[...]
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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mysqldump: Couldn't execute 'SHOW SLAVE STATUS': MySQL server has gone away (2006)
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Segmentation fault
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Expected result: It shouldnt try to execute the "SHOW SLAVE STATUS" query as it cannot connect to the server and definitely not go on a loop and segfault.
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Note: The bug might have appeared since MDEV-5624 has been fixed, i don't recall seeing that issue before 5.5.36 but I might be wrong about that.
Bug
Major
