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fix: Record device list changes before syncs can read their count #2443

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ginger merged 1 commit from eleboucher/continuwuity:fix/device-list-count-race into main 2026-11-05 15:17:24 +00:00
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eleboucher commented 2026-11-02 19:17:34 +00:00
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mark_device_key_update took a count before writing its device-list markers, so a sync that read that count in between skipped the change for good and the new device never reached other users. The markers are now written while the counter lock is held, and in a reproduction under load the misses went from 2–7 per 1000 new devices to 0.

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fix: Record device list changes before syncs can read their count
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eacd1c45e1
 
Signed-off-by: Erwan Leboucher <erwanleboucher@gmail.com>
eleboucher force-pushed fix/device-list-count-race from eacd1c45e1
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2026-11-03 10:08:47 +00:00 Compare
Jade approved these changes 2026-11-04 13:18:46 +00:00
Jade commented 2026-11-04 13:19:01 +00:00
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(light review)

(light review)
ginger approved these changes 2026-11-05 15:17:20 +00:00
ginger merged commit fb389cb6f9 into main 2026-11-05 15:17:24 +00:00
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#2455 fix: Store to-device messages before syncs can read their count
continuwuation/continuwuity
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continuwuation/continuwuity!2443
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