[LU-15907] sanityn test_41i: fix the OBD_FAIL_MDS_REINT_OPEN2 race

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Etienne Aujames
• Reporter: Etienne Aujames

Description

With the https://review.whamcloud.com/47487 ("LU-15546 mdt: mdt_reint_open lookup before locking") , the OBD_FAIL_MDS_REINT_OPEN2 race timeouts in sanityn test_41i:

LustreError: 3945:0:(libcfs_fail.h:178:cfs_race()) cfs_fail_race id 16a awake: rc=0

Now, the first thread take a PW parent lock (by checking the child existence before locking) . So the second thread is waiting for lock (PR locks are compatible but not the PW locks) .

We have to force the first thread to take a PR parent lock to keep testing the full lock cycle:

• take PR parent lock
• lockup child (do not exist)
• take PW parent lock
• re-lookup
• create child