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Verified the bug on SSSD version: sssd-1.14.0-43.el7_3.14
Steps followed during verification:
1. Setup ldap with with 25000 users.
2. Setup client with enumeration = true in sssd.conf
3. Run user auth and lookup to verify whether sssd_be process is hanged or not.
Automated these steps in the SSSD Performance test suite and also executed the regression round.
See beaker link: https://beaker.engineering.redhat.com/jobs/1786406
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:: [ LOG ] :: sssdbe can deadlock if a long running task like enumeration blocks it bz1418943
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:: [ LOG ] :: Sleeping for 5 seconds
:: [ PASS ] :: Command 'getent -s sss passwd puser15999' (Expected 0, got 0)
:: [ LOG ] :: Authentication successfull, as expected
:: [ LOG ] :: Duration: 3m 18s
:: [ LOG ] :: Assertions: 1 good, 0 bad
:: [ PASS ] :: RESULT: sssdbe can deadlock if a long running task like enumeration blocks it bz1418943
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2017:0908