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Description of problem:
This is a regression in 7.2 that breaks the protection of leases when the shared lease mode is used. It first appeared in sanlock 3.2.3, as a result of this commit:
https://git.fedorahosted.org/cgit/sanlock.git/commit/?id=e40e1f6e22f9b10f08d53fc7
That commit added a paxos_erase_dblock() call in paxos_lease_release(), which wrongly clears the shared flag in the mode_block that had just been set. Acquiring the shared lease works, and sanlock believes it is held, but on disk the shared flag has been inadvertently cleared by erasing the dblock structure. This means that an exclusive lease requested by another host will not see the shared flag and will succeed.
Two hosts will never be able to hold an exclusive lease concurrently, and an existing exclusive lease can never be acquired shared by another host.
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