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An initgroups request for an AD user consists of two parts - resolving the AD user, which internally calls an LDAP request and adding the IPA external group memberships. For (probably?) historical reasons from the time before we had any notion of subdomains, the initgrTimestamp attribute is written down at the LDAP request level when it finishes -- which means the initgrTimestamp is written before the IPA external group membership is evaluated.
When two requests for initgroups arrive semi-concurrently, it can happen that the first request will trigger the whole machinery while the other one would evaluate the initgrTimestamp attribute that was just bumped, but the IPA group memberships were not yet written to the cache.
The result is that the second racing request only returns AD groups.
PR: https://github.com/SSSD/sssd/pull/575
Metadata Update from @jhrozek: - Issue tagged with: PR, bug
master: e354ec7
Metadata Update from @fidencio: - Issue untagged with: PR - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)
Metadata Update from @jhrozek: - Issue set to the milestone: SSSD 1.16.2
Metadata Update from @jhrozek: - Custom field rhbz adjusted to https://bugzilla.redhat.com/show_bug.cgi?id=1568370
Issue linked to Bugzilla: Bug 1568370
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