Paul Dagnelie 99b281f1ae
Fix double mutex_init bug in send code
It was possible to cause a kernel panic in the send code by 
initializing an already-initialized mutex, if a record was created 
with type DATA, destroyed with a different type (bypassing the 
mutex_destroy call) and then re-allocated as a DATA record again.

We tweak the logic to not change the type of a record once it has 
been created, avoiding the issue.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #10374
2020-06-03 19:53:21 -07:00
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