fix(dot/peerset): fix sending on closed channel race condition when dropping peer #2573

timwu20 · 2022-05-31T01:33:15Z

Changes

sets channel to nil on close
nil check before producing to channel

Tests

go test ./dot/network

Issues

#2567

Primary Reviewer

@kishansagathiya

qdm12 · 2022-05-31T12:43:28Z

dot/peerset/peerset.go

+			ps.resultMsgCh <- Message{
+				Status: Drop,
+				setID:  uint64(setIdx),
+				PeerID: pid,
+			}


Shouldn't the producer close the channel? So somewhere here 🤔

I think there are problems with the arch of peerset.Handler that we should address at some point.

Right now this channel is returned by Handler.Messages(), but it's not a true pipeline. If handler.Messages() was called again and was consumed, then messages would be split among all readers.

IMO the producer is peerset.Peerset so the producer is actually closing the channel. Just on another goroutine.

kishansagathiya

So, channel ps.resultMsgCh is used in two goroutines ps.listenAction(ctx) and ps.periodicallyAllocateSlots(ctx).

It looks like problems is happening because when a context is done, ps.periodicallyAllocateSlots(ctx) processes it and closes the channel, but ps.listenAction(ctx) does not get to know about it until next for loop iteration.

@timwu20 It looks like you have fixed the problem for disconnect action, but the given problem could still occur in other actions such as removeReservedPeers, removePeer and incoming.

We can make a similar fix in the remaining actions or check if context was done using ctx.Err() before using the channel. I like the later approach better (I don't have a reason why :)).

timwu20 · 2022-06-01T19:27:18Z

So, channel ps.resultMsgCh is used in two goroutines ps.listenAction(ctx) and ps.periodicallyAllocateSlots(ctx).

It looks like problems is happening because when a context is done, ps.periodicallyAllocateSlots(ctx) processes it and closes the channel, but ps.listenAction(ctx) does not get to know about it until next for loop iteration.

@timwu20 It looks like you have fixed the problem for disconnect action, but the given problem could still occur in other actions such as removeReservedPeers, removePeer and incoming.

Thanks for pointing this out. I'll add the check for all the writes to the channel. I was just debugging the panic produced by running the tests.

We can make a similar fix in the remaining actions or check if context was done using ctx.Err() before using the channel. I like the later approach better (I don't have a reason why :)).

I'd prefer not to check ctx.Err() since in the future I'd rather remove context from the service architecture entirely.

I think the solution to avoid these race conditions on accessing closed channels is sequence ps.periodicallyAllocateSlots() within the same loop as ps.listenAction. That way if the context closes, it is currently processing some action which it completes, then closes the channel. Or it's performing periodicallyAllocateSlots, then the channel closes.

codecov · 2022-06-01T20:08:55Z

Codecov Report

Merging #2573 (6c62a28) into development (1015733) will decrease coverage by 0.13%.
The diff coverage is 42.85%.

@@               Coverage Diff               @@
##           development    #2573      +/-   ##
===============================================
- Coverage        57.46%   57.33%   -0.14%     
===============================================
  Files              217      215       -2     
  Lines            28609    28425     -184     
===============================================
- Hits             16440    16297     -143     
+ Misses           10482    10449      -33     
+ Partials          1687     1679       -8

Flag	Coverage Δ
unit-tests	`57.33% <42.85%> (-0.14%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dot/peerset/peerset.go	`49.34% <42.85%> (-0.23%)`	⬇️
lib/blocktree/leaves.go	`93.39% <0.00%> (-2.84%)`	⬇️
lib/trie/lookup.go	`73.91% <0.00%> (-2.09%)`	⬇️
internal/trie/node/branch_encode.go	`85.27% <0.00%> (-2.02%)`	⬇️
internal/trie/node/hash.go	`82.35% <0.00%> (-1.86%)`	⬇️
lib/runtime/test_helpers.go	`7.94% <0.00%> (-0.65%)`	⬇️
lib/trie/database.go	`50.30% <0.00%> (-0.58%)`	⬇️
internal/trie/node/decode.go	`95.91% <0.00%> (-0.24%)`	⬇️
cmd/gossamer/config.go	`73.77% <0.00%> (-0.08%)`	⬇️
cmd/gossamer/main.go	`13.88% <0.00%> (-0.06%)`	⬇️
... and 27 more

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1015733...6c62a28. Read the comment docs.

kishansagathiya

Looks good! Just two more comments with easy fix!!

kishansagathiya · 2022-06-06T08:53:39Z

dot/peerset/peerset.go

+		ticker.Stop()
+		close(ps.resultMsgCh)
+	}()
+
 	for {
 		select {
 		case <-ctx.Done():
 			return


We could put this log back logger.Debugf("peerset slot allocation exiting: %s", ctx.Err())

kishansagathiya · 2022-06-06T08:59:00Z

dot/peerset/peerset.go

+
+	defer func() {
+		ticker.Stop()
+		close(ps.resultMsgCh)


should we close ps.actionQueue as well here? does not look like that channel is getting closed anywhere!

Note we don't need to close channels, the GC will take care of it. It's usually used to signal to multiple goroutines (a bit like contexts I guess).

On the other hand, I don't mind closing it, to make sure some other goroutine doesn't use it after, since our dot/network and dot/peerset code is a bit async-messy. Better to have a panic than goroutines accumulating and not doing anything (blocked since there is no consumer anymore).

actionQueue is closed in Handler.Stop(). Seems like it's passed into PeerSet.start. It's kind of an odd design to be honest, but I'd rather not refactor the Handler to PeerSet relationship.

# [0.7.0](v0.6.0...v0.7.0) (2022-11-23) ### Bug Fixes * **chain:** update ed25519 addresses in dev/gssmr genesis files ([#2225](#2225)) ([5f47d8b](5f47d8b)) * **ci:** caching of Go caches ([#2451](#2451)) ([ce3c10c](ce3c10c)) * **ci:** codecov.yml configuration ([#2698](#2698)) ([d4fc383](d4fc383)) * **ci:** comment skip code for required workflows ([#2312](#2312)) ([45dce9b](45dce9b)) * **ci:** copyright workflow to exit if different files ([#2487](#2487)) ([89c32ae](89c32ae)) * **ci:** deepsource toml configuration ([#2744](#2744)) ([86a70de](86a70de)) * **ci:** embed v0.9.20 runtime, update test suite, and ci workflows ([#2543](#2543)) ([0fff418](0fff418)), closes [#2419](#2419) [#2561](#2561) [#2572](#2572) [#2581](#2581) [#2671](#2671) * **ci:** fix staging Dockerfile ([#2474](#2474)) ([ae04b80](ae04b80)) * **ci:** mocks checking fixes ([#2274](#2274)) ([d1308e0](d1308e0)) * **ci:** run devnet module unit tests ([#2756](#2756)) ([f635c59](f635c59)) * **ci:** run golangci-lint on integration tests ([#2275](#2275)) ([3ae3401](3ae3401)) * **cmd:** allow --genesis flag to be passed to base command ([#2427](#2427)) ([7f5b5aa](7f5b5aa)) * **cmd:** avoid nil pointer dereference ([#2578](#2578)) ([f2cdfea](f2cdfea)) * **config:** temporary fix for pprof enabled setting precedence ([#2786](#2786)) ([d4d6262](d4d6262)) * **core:** fix txn pool for latest runtime ([#2809](#2809)) ([1551e66](1551e66)) * **deps:** upgrade chaindb to remove badger logs ([#2738](#2738)) ([e0c5706](e0c5706)) * **devnet:** Fix build workflow for devnet ([#2125](#2125)) ([0375fc2](0375fc2)) * **Dockerfile:** remove script entrypoint ([#2707](#2707)) ([abd161b](abd161b)) * **dot/core:** `RuntimeInstance` interface `Version` signature ([#2783](#2783)) ([7d66ec0](7d66ec0)) * **dot/core:** fix the race condition in TrieState ([#2499](#2499)) ([804069c](804069c)), closes [#2402](#2402) * **dot/digest:** BABE NextEpochData and NextConfigData should be set on finalization ([#2339](#2339)) ([e991cc8](e991cc8)) * **dot/digest:** verify if next epoch already contains some definition ([#2472](#2472)) ([a2ac6c2](a2ac6c2)) * **dot/netwok:** check for duplicate message earlier ([#2435](#2435)) ([d62503f](d62503f)) * **dot/network:** change BlockRequestMessage number from uint64 to uint32 ([8105cd4](8105cd4)) * **dot/network:** close notifications streams ([#2093](#2093)) ([de6e7c9](de6e7c9)), closes [#2046](#2046) * **dot/network:** fixing errMissingHandshakeMutex ([#2303](#2303)) ([eb07a53](eb07a53)) * **dot/network:** memory improvement for network buffers ([#2233](#2233)) ([fd9b70d](fd9b70d)) * **dot/network:** public IP address logging ([#2140](#2140)) ([9e21587](9e21587)) * **dot/network:** re-add nil mutex check for disconnected peer ([#2408](#2408)) ([9b39bd1](9b39bd1)) * **dot/network:** remove `defer cancel()` inside loop ([#2248](#2248)) ([9e360a5](9e360a5)) * **dot/network:** resize bytes slice buffer if needed ([#2291](#2291)) ([8db8b2a](8db8b2a)) * **dot/peerset:** fix sending on closed channel race condition when dropping peer ([#2573](#2573)) ([2fa5d8a](2fa5d8a)) * **dot/peerset:** remove race conditions from `peerset` package ([#2267](#2267)) ([df09d45](df09d45)) * **dot/rpc/modules:** grandpa.proveFinality update parameters, fix bug ([#2576](#2576)) ([e7749cf](e7749cf)) * **dot/rpc/modules:** rpc.state.queryStorage fixed ([#2565](#2565)) ([1ec0d47](1ec0d47)) * **dot/rpc:** include unsafe flags to be considered by RPC layer ([#2483](#2483)) ([3822257](3822257)) * **dot/state/epoch, lib/babe:** enable block production through epochs without rely on finalization ([#2593](#2593)) ([a0a1804](a0a1804)) * **dot/state:** actually prune finalized tries from memory ([#2196](#2196)) ([e4bc375](e4bc375)) * **dot/state:** change map of tries implementation to have working garbage collection ([#2206](#2206)) ([fada46b](fada46b)) * **dot/state:** inject mutex protected tries to states ([#2287](#2287)) ([67a9bbb](67a9bbb)) * **dot/subscription:** check websocket message from untrusted data ([#2527](#2527)) ([1f20d98](1f20d98)) * **dot/subscription:** unsafe type casting from untrusted input ([#2529](#2529)) ([1015733](1015733)) * **dot/sync, dot/rpc:** implement HighestBlock ([#2195](#2195)) ([f8d8657](f8d8657)) * **dot/sync:** cleanup logs; don't log case where we fail to get parent while processing ([#2188](#2188)) ([cb360ab](cb360ab)) * **dot/sync:** fix "block with unknown header is ready" error ([#2191](#2191)) ([483466f](483466f)) * **dot/sync:** fix `Test_lockQueue_threadSafety` ([#2605](#2605)) ([223cfbb](223cfbb)) * **dot/sync:** Fix flaky tests `Test_chainSync_logSyncSpeed` and `Test_chainSync_start` ([#2610](#2610)) ([7e1014b](7e1014b)) * **dot/sync:** Gossip `BlockAnnounceMessage` only after successfully imported ([#2885](#2885)) ([69031a6](69031a6)) * **dot/sync:** remove block announcement in `bootstrap` sync mode ([#2906](#2906)) ([2b4c257](2b4c257)) * **dot/sync:** remove max size limit from ascending block requests ([#2256](#2256)) ([e287d7e](e287d7e)) * **dot/sync:** sync benchmark ([#2234](#2234)) ([2f3aef8](2f3aef8)) * **dot/telemetry:** telemetry hashes to be in the hexadecimal format ([#2194](#2194)) ([9b48106](9b48106)) * **dot:** database close error checks ([#2948](#2948)) ([bdb0eea](bdb0eea)) * **dot:** no error logged for init check ([#2502](#2502)) ([2971325](2971325)) * ensure we convert the `uint` type ([#2626](#2626)) ([792e53f](792e53f)) * fix logger mutex locking in `.New` method ([#2114](#2114)) ([e7207ed](e7207ed)) * **internal/log:** log level `DoNotChange` ([#2672](#2672)) ([0008b59](0008b59)) * **levels-logged:** Fix log levels logging at start ([#2236](#2236)) ([a90a6e0](a90a6e0)) * **lib/babe:** check if authority index is in the `authorities` range ([#2601](#2601)) ([1072888](1072888)) * **lib/babe:** ensure the slot time is correct before build a block ([#2648](#2648)) ([78c03b6](78c03b6)) * **lib/babe:** epoch context error wrapping ([#2484](#2484)) ([c053dea](c053dea)) * **lib/babe:** Unrestricted Loop When Building Blocks (GSR-19) ([#2632](#2632)) ([139ad89](139ad89)) * **lib/blocktree:** reimplement `BestBlockHash` to take into account primary blocks in fork choice rule ([#2254](#2254)) ([1a368e2](1a368e2)) * **lib/grandpa:** avoid spamming round messages ([#2688](#2688)) ([b0042b8](b0042b8)) * **lib/grandpa:** capped number of tracked commit messages ([#2490](#2490)) ([47c23e6](47c23e6)) * **lib/grandpa:** capped number of tracked vote messages ([#2485](#2485)) ([d2ee47e](d2ee47e)), closes [#1531](#1531) * **lib/grandpa:** check equivocatory votes count ([#2497](#2497)) ([014629d](014629d)), closes [#2401](#2401) * **lib/grandpa:** Duplicate votes is GRANDPA are counted as equivocatory votes (GSR-11) ([#2624](#2624)) ([422e7b3](422e7b3)) * **lib/grandpa:** Storing Justification Allows Extra Bytes (GSR-13) ([#2618](#2618)) ([0fcde63](0fcde63)) * **lib/grandpa:** update grandpa protocol ID ([#2678](#2678)) ([3be75b2](3be75b2)) * **lib/grandpa:** various finality fixes, improves cross-client finality ([#2368](#2368)) ([c04d185](c04d185)) * **lib/grandpa:** verify equivocatory votes in grandpa justifications ([#2486](#2486)) ([368f8b6](368f8b6)) * **lib/runtime:** avoid caching version in runtime instance ([#2425](#2425)) ([7ab31f0](7ab31f0)) * **lib/runtime:** stub v0.9.17 host API functions ([#2420](#2420)) ([6a7b223](6a7b223)) * **lib/trie:** `handleDeletion` generation propagation ([24c303d](24c303d)) * **lib/trie:** `PopulateMerkleValues` functionality changes and fixes ([#2871](#2871)) ([7131290](7131290)) * **lib/trie:** Check for root in EncodeAndHash ([#2359](#2359)) ([087db89](087db89)) * **lib/trie:** Make sure writing and reading a trie to disk gives the same trie and cover more store/load child trie related test cases ([#2302](#2302)) ([7cd4118](7cd4118)) * **lib/trie:** prepare trie nodes for mutation only when needed ([#2834](#2834)) ([26868df](26868df)) * **lib/trie:** remove map deletion at `loadProof` ([#2259](#2259)) ([fbd13d2](fbd13d2)) * **lint:** fix issues found by golangcilint 1.47.3 ([#2715](#2715)) ([5765e67](5765e67)) * **mocks:** add missing `//go:generate` for mocks ([#2273](#2273)) ([f4f7465](f4f7465)) * **pprof:** pprofserver flag changed to boolean ([#2205](#2205)) ([be00a69](be00a69)) * **staging:** revise datadog-agent start process ([#2935](#2935)) ([36ce37d](36ce37d)) * **state/epoch:** assign epoch 1 when block number is 0 ([#2592](#2592)) ([e5c8cf5](e5c8cf5)) * **state/grandpa:** track changes across forks ([#2519](#2519)) ([3ab76bc](3ab76bc)) * **tests:** `TestAuthorModule_HasSessionKeys_Integration` ([#2932](#2932)) ([8d809aa](8d809aa)) * **tests:** fix block body regex in `TestChainRPC` ([#2805](#2805)) ([b0680f8](b0680f8)) * **tests:** Fix RFC3339 regex for log unit tests ([9caea2a](9caea2a)) * **tests:** Fix wasmer flaky sorts ([#2643](#2643)) ([7eede9a](7eede9a)) * **tests:** handle node crash during waiting ([#2691](#2691)) ([843bd50](843bd50)) * **tests:** update block body regex in `TestChainRPC` ([#2674](#2674)) ([055e5c3](055e5c3)) * **trie:** decode inline child nodes ([#2369](#2369)) ([9efde47](9efde47)) * **trie:** descendants count for clear prefix ([#2606](#2606)) ([1826896](1826896)) * **trie:** disallow empty byte slice node values ([#2927](#2927)) ([d769d1c](d769d1c)) * **trie:** equality differentiate nil and empty storage values ([#2969](#2969)) ([72a08ec](72a08ec)) * **trie:** no in-memory caching of node encoding ([#2919](#2919)) ([856780b](856780b)) * **trie:** Panic when deleting nonexistent keys from trie (GSR-10) ([#2609](#2609)) ([7886318](7886318)) * **trie:** remove encoding buffers pool ([#2929](#2929)) ([f4074cc](f4074cc)) * **trie:** use cached Merkle values for root hash ([#2943](#2943)) ([ec2549a](ec2549a)) * **trie:** use direct Merkle value for database keys ([#2725](#2725)) ([1a3c3ae](1a3c3ae)) * upgrade auto-generated mocks ([#2910](#2910)) ([a2975a5](a2975a5)) * **wasmer:** error logs for signature verification ([#2752](#2752)) ([363c080](363c080)) * **wasmer:** fix flaky sort in `Test_ext_crypto_sr25519_public_keys_version_1` ([#2607](#2607)) ([c061b35](c061b35)) ### Features * **build:** add `github.com/breml/rootcerts` ([#2695](#2695)) ([c74a5b0](c74a5b0)) * **build:** binary built-in timezone data ([#2697](#2697)) ([fdd5bda](fdd5bda)) * **chain:** use always the raw genesis file ([#2775](#2775)) ([dd2fbc9](dd2fbc9)) * **ci:** update mockery from `2.10` to `2.14` ([#2642](#2642)) ([d2c42b8](d2c42b8)) * **cross-client:** create docker-compose.yml for local devnet ([#2282](#2282)) ([8abbd87](8abbd87)) * detect chain directory dynamically ([#2292](#2292)) ([85c466c](85c466c)) * **devnet:** add substrate docker images to dockerfile ([#2263](#2263)) ([b7b2a66](b7b2a66)) * **devnet:** continuous integration `gssmr` devnet on AWS ECS ([#2096](#2096)) ([d096d44](d096d44)) * **docker:** docker-compose.yml to run Gossamer, Prometheus and Grafana ([#2706](#2706)) ([c5dda51](c5dda51)) * **dot/network:** add mismatched genesis peer reporting ([#2265](#2265)) ([a1d7269](a1d7269)) * **dot/state:** `gossamer_storage_tries_cached_total` gauge metric ([#2272](#2272)) ([625cbcf](625cbcf)) * **e2e:** build Gossamer on any test run ([#2608](#2608)) ([f97e0ef](f97e0ef)) * **go:** upgrade Go from 1.17 to 1.18 ([#2379](#2379)) ([d85a1db](d85a1db)) * include nested varying data type on neighbor messages ([#2722](#2722)) ([426569a](426569a)) * **lib/babe:** implement secondary slot block production ([#2260](#2260)) ([fcb81a3](fcb81a3)) * **lib/runtime:** support Substrate WASM compression ([#2213](#2213)) ([fd60061](fd60061)) * **lib/trie:** atomic tracked merkle values ([#2876](#2876)) ([1c4174c](1c4174c)) * **lib/trie:** clear fields when node is dirty ([#2297](#2297)) ([1162828](1162828)) * **lib/trie:** only copy nodes when mutation is certain ([#2352](#2352)) ([86624cf](86624cf)) * **lib/trie:** opportunistic parallel hashing ([#2081](#2081)) ([790dfb5](790dfb5)) * **metrics:** replace metrics port with address (breaking change) ([#2382](#2382)) ([d2ec68d](d2ec68d)) * **pkg/scale:** add `Encoder` with `Encode` method ([#2741](#2741)) ([af5c63f](af5c63f)) * **pkg/scale:** add use of pkg/error Wrap for error handling ([#2708](#2708)) ([08c4281](08c4281)) * **pkg/scale:** encoding and decoding of maps in scale ([#2894](#2894)) ([405db51](405db51)), closes [#2796](#2796) * **pkg/scale:** support for custom `VaryingDataType` types ([#2612](#2612)) ([914a747](914a747)) * remove uneeded runtime prefix logs ([#2110](#2110)) ([8bd05d1](8bd05d1)) * remove unused code ([#2677](#2677)) ([b3698d7](b3698d7)) * **scale:** add range checks to decodeUint function ([#2683](#2683)) ([ac700f8](ac700f8)) * **trie:** decode all inlined node variants ([#2611](#2611)) ([b09eb07](b09eb07)) * **trie:** export `LoadFromProof` ([#2455](#2455)) ([0b4f33d](0b4f33d)) * **trie:** faster header decoding ([#2649](#2649)) ([d9460e3](d9460e3)) * **trie:** finer deep copy of nodes ([#2384](#2384)) ([bd6d8e4](bd6d8e4)) * **trie:** tracking of number of descendant nodes for each node ([#2378](#2378)) ([dfcdd3c](dfcdd3c)) * **trie:** use scale encoder ([#2930](#2930)) ([e3dc108](e3dc108)) * **wasmer/crypto:** move sig verifier to crypto pkg ([#2057](#2057)) ([dc8bbef](dc8bbef)) * **wasmer:** Add `SetTestVersion` method to `Config` struct ([#2823](#2823)) ([e5c9336](e5c9336)) * **wasmer:** get and cache state version in instance context ([#2747](#2747)) ([3fd63db](3fd63db))

set channel to nil on close, check for nil chan

26b1dce

timwu20 requested review from noot, edwardmack, EclesioMeloJunior, jimjbrettj, kishansagathiya and qdm12 as code owners May 31, 2022 01:33

qdm12 reviewed May 31, 2022

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kishansagathiya reviewed Jun 1, 2022

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refactor parallel goroutines to single goroutine

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timwu20 requested review from kishansagathiya and qdm12 June 2, 2022 15:39

qdm12 approved these changes Jun 3, 2022

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kishansagathiya approved these changes Jun 6, 2022

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timwu20 added 3 commits June 8, 2022 15:30

cr feedback

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bump to 45m

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bump up integration to 45m

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timwu20 merged commit 2fa5d8a into development Jun 10, 2022

timwu20 deleted the tim/fix-panic-closed-chan branch June 10, 2022 17:48

kishansagathiya mentioned this pull request Jun 15, 2022

Sending on a closed channel in networks package #2567

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fix(dot/peerset): fix sending on closed channel race condition when dropping peer #2573

fix(dot/peerset): fix sending on closed channel race condition when dropping peer #2573

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fix(dot/peerset): fix sending on closed channel race condition when dropping peer #2573

fix(dot/peerset): fix sending on closed channel race condition when dropping peer #2573

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