[SERVER-85790] Innocuous change in jstests/libs/optimizer_utils.js causes consistent system failures Created: 26/Jan/24  Updated: 01/Feb/24  Resolved: 01/Feb/24

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Improvement Priority: Major - P3
Reporter: William Qian Assignee: Jacob Evans
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
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is related to SERVER-82200 burn_in_tags should include indirectl... Closed
Assigned Teams:
Query Optimization
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 Description   

(Ticket based on a Slack thread.)

I've consistently gotten system failures for version_burn_in_gen on a series of (what I think) as simple JS test changes:
1 2 3 4 5 6 7 8.

In questioning my sanity, I also ran a patch against the base commit, which completes without error.

Eventually, I landed on this diff as being a minimal reproduction of the system failure... but for the life of me, I can't figure out why. That this patch and this other patch both pass version_burn_in_gen adds to my suspicion that the change to jstests/libs/optimizer_utils.js is the culprit

Does anyone have insight into this? This seems like a pretty big nuisance at minimum, a potentially serious bug at worst.


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