Fix flakey TestPluginCleanup in CI #49104
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Acquire lock for all Access List resources before locking individual Access List in `ListAccessListMembers`. What seemed to happen in CI was `ListAccessListMembers` was called, thereby locking the individual list. If IneligibilityReconciler ran simultaneously, it would lock all Access Lists, then fail to acquire the individual Access List's lock, leading to a deadlock. This didn't seem to come up in real-world conditions, but was causing flakey failures in CI when running many times at once.
kiosion
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zmb3
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Nov 17, 2024
| err := a.service.RunWhileLocked(ctx, lockName(accessListName), accessListLockTTL, func(ctx context.Context, _ backend.Backend) error { | ||
| _, err := a.service.GetResource(ctx, accessListName) | ||
| if err != nil { | ||
| err := a.service.RunWhileLocked(ctx, []string{accessListResourceLockName}, accessListLockTTL, func(ctx context.Context, _ backend.Backend) error { |
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So only one auth server can ever list access list members at a time?
Any scale concerns here?
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Possibly... Going over this in more detail today; I'm not really satisfied with this fix. It might work to not lock all lists on update/upsert of a single list instead.
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If this deadlock can only happen during testing and not in real-world scenarios:
why not align the tests accordingly and leave the implementation unchanged? |
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Found the actual cause – opened #5530. |
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Acquire lock for all Access List resources before locking individual Access List in
ListAccessListMembers.What seemed to happen in CI is if
ListAccessListMemberswas called, it would lock the individual list. If IneligibilityReconciler then ran simultaneously, it would lock all Access Lists, before failing to acquire the individual Access List's lock, leading to a deadlock.This didn't seem to come up in real-world conditions, but was causing flakey failures in CI when running many times at once.
Resolves #5456.