# PSA: Disruption To Kusama Validators' Self-Stake and Rewards **URL:** \ **Category:** Ecosystem\ **Tags:** staking\ **Created:** [October 21, 2025, 8:50am UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599 "2025-10-21T08:50:58Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![kianenigma](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/kianenigma/32/6153_2.png) [@kianenigma](https://forum.polkadot.network/u/kianenigma)\ **Post date:** [October 21, 2025, 8:50am UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599/1 "2025-10-21T08:50:58Z")
Hi everyone. Writing this post to give an update about a bug that was recently discovered in the Kusama Network after AHM was executed. Throughout the migration, the old `pallet-stakin` in the Kusama RC was retired and replaced with `pallet-staking-async` living in Kusama AH. The same flow is scheduled repeat in Polkadot Nov 4th. Thanks to a number of reports for Kusama validators we identified a bug in `pallet-staking-async` that causes the following issue: **In most cases, self-stake of validators was not being correctly recorded onchain. The main consequence of this is that for a number of eras Kusama validators have not been rewarded (nor are slashable) for their self-stake in recent eras.** We identified this issue last Friday, and by Sunday, a fix was ready: [[AHM/Staking] Allow own stake to be collected in all pages by kianenigma · Pull Request #10051 · paritytech/polkadot-sdk · GitHub](https://github.com/paritytech/polkadot-sdk/pull/10051) We are now proceeding with merging this fix in the Kusama runtime code, and propose a 1.9.3 runtime upgrade to fix the issue. This problem will not exist in the upcoming Polkadot release on Nov 4th, the Polkadot AHM. I want to thank the validators who reported the issue, and encourage them to, after the fix is enacted, calculate their “missing rewards” in the period since Kusama AHM was executed up until the fix, and seek a tip from the treasury. ### Example Without going into too much details, let’s consider one of the validators in Kusama: `DNBrjMnPyjEeBsDUkyeWJ9ba6eVdaFHixUPM2MGgms4xcyK`. This validator has a self-stake of ~159KSM (query=`staking.ledger`), which in most cases, should become active in the staking election. Looking at the final `ExposureMetadata` (query=`staking.erasStakersOverview`) of this validator in the active era, we can see that `own` is set to zero, which means to self-stake was recorded for this validator. ![Screenshot 2025-10-21 at 09.46.53](https://europe1.discourse-cdn.com/flex005/uploads/polkadot2/original/2X/e/ec7949be6694564b963703e944a1313e30ff8298.png) ### Related Work - We are updating the staking view in PJS Apps to demonstrate the own stake, total stake, and nominator count of each active validator more precisely: [Better staking overview by kianenigma · Pull Request #11930 · polkadot-js/apps · GitHub](https://github.com/polkadot-js/apps/pull/11930) ---
**Author:** ![resilient4820](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/resilient4820/32/7243_2.png) [@resilient4820](https://forum.polkadot.network/u/resilient4820)\ **Post date:** [October 21, 2025, 10:32am UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599/2 "2025-10-21T10:32:35Z")
> [@kianenigma](#): > > I want to thank the validators who reported the issue, and encourage them to, after the fix is enacted, calculate their “missing rewards” in the period since Kusama AHM was executed up until the fix, and seek a tip from the treasury. Should every single validator do that? Do they all know how? Shouldn’t it be pushed to them automatically? ---
**Author:** ![kianenigma](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/kianenigma/32/6153_2.png) [@kianenigma](https://forum.polkadot.network/u/kianenigma)\ **Post date:** [October 21, 2025, 10:36am UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599/3 "2025-10-21T10:36:13Z")
Once we have the fix in place, we can do a back of an envelope calculation and tip all of them. I am for now encouraging others to look into it, hopefully one community member will pick this up and calculate it. If not, I will do it myself 🤝 ---
**Author:** ![kianenigma](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/kianenigma/32/6153_2.png) [@kianenigma](https://forum.polkadot.network/u/kianenigma)\ **Post date:** [October 30, 2025, 2:04pm UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599/4 "2025-10-30T14:04:51Z")
The fix referendum has been executed: [https://kusama.subsquare.io/referenda/608](https://kusama.subsquare.io/referenda/608) ---
**Author:** ![karol](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/karol/32/10036_2.png) [@karol](https://forum.polkadot.network/u/karol)\ **Post date:** [October 30, 2025, 10:40pm UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599/5 "2025-10-30T22:40:19Z")
Following referendas execution, Kusama Asset Hub has been updated to 1.9.3 on block: > **[Subscan | Aggregate Substrate ecological network high-precision Web3 explorer](https://assethub-kusama.subscan.io/event/11452400-1)** > > Subscan Explorer - Your blockchain explorer focused on the Substrate ecosystem and EVM support, offering block, transaction, and address insights for AssetHub Kusama. Now supporting nearly 100 networks with ongoing expansion. Your Web3 Portal for... ---
**Author:** ![paulormart](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/paulormart/32/186_2.png) [@paulormart](https://forum.polkadot.network/u/paulormart)\ **Post date:** [October 31, 2025, 5:12pm UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599/6 "2025-10-31T17:12:36Z")
I’ve put together a draft example of the self-stake missed rewards here [Draft self-stake missing rewards calculation by paulormart · Pull Request #142 · turboflakes/subxt · GitHub](https://github.com/turboflakes/subxt/pull/142) If someone else would like to verify would be great. From my calculations the missed self-stake rewards resulted on 401.651409929767 KSM for 876 validators. ---
**Author:** ![kianenigma](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.polkadot.network/kianenigma/32/6153_2.png) [@kianenigma](https://forum.polkadot.network/u/kianenigma)\ **Post date:** [November 6, 2025, 2:08pm UTC](https://forum.polkadot.network/t/psa-disruption-to-kusama-validators-self-stake-and-rewards/15599/7 "2025-11-06T14:08:41Z")
Thanks for the calculation @paulormart! If the validator community is inclined to do so, will support a proposal to refund them. Although, the values might be small enough that validators might be okay to write it off as a one-off incident, as over the course of an annual payout, it will be a tiny fraction.