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eth/downloader: don't signal sync startup before fetchers register for cancellation (#35515)

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Close the started signal only after the fetchers are registered on
cancelWg, so suspend's Cancel actually waits for them instead of racing
the registration.
This commit is contained in:
0xSHKWON 2026-08-12 16:31:51 +09:00 committed by GitHub
parent 8f1a3fee9f
commit ceced06cb0
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GPG key ID: B5690EEEBB952194
1 changed files with 13 additions and 9 deletions
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22
eth/downloader/downloader.go
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@ -365,8 +365,8 @@ func (d *Downloader) synchronise(beaconPing chan struct{}) (err error) {
// The beacon header syncer is async. It will start this synchronization and
// will continue doing other tasks. However, if synchronization needs to be
// cancelled, the syncer needs to know if we reached the startup point (and
// inited the cancel channel) or not yet. Make sure that we'll signal even in
// case of a failure.
// registered the fetchers for cancellation) or not yet. Make sure that we'll
// signal even in case of a failure.
if beaconPing != nil {
defer func() {
select {
@ -435,10 +435,7 @@ func (d *Downloader) synchronise(beaconPing chan struct{}) (err error) {
d.mode.Store(uint32(mode))
defer d.mode.Store(0)
if beaconPing != nil {
close(beaconPing)
}
return d.syncToHead()
return d.syncToHead(beaconPing)
}
// getMode returns the sync mode used within current cycle.
@ -459,7 +456,7 @@ func (d *Downloader) SubscribeSyncEvents(ch chan<- SyncEvent) event.Subscription
// syncToHead starts a block synchronization based on the hash chain from
// the specified head hash.
func (d *Downloader) syncToHead() (err error) {
func (d *Downloader) syncToHead(beaconPing chan struct{}) (err error) {
mode := d.getMode()
d.feed.Send(SyncEvent{Type: SyncStarted, Mode: mode})
defer func() {
@ -643,14 +640,21 @@ func (d *Downloader) syncToHead() (err error) {
} else if mode == ethconfig.FullSync {
fetchers = append(fetchers, func() error { return d.processFullSyncContent() })
}
return d.spawnSync(fetchers)
return d.spawnSync(fetchers, beaconPing)
}
// spawnSync runs d.process and all given fetcher functions to completion in
// separate goroutines, returning the first error that appears.
func (d *Downloader) spawnSync(fetchers []func() error) error {
func (d *Downloader) spawnSync(fetchers []func() error, beaconPing chan struct{}) error {
errc := make(chan error, len(fetchers))
d.cancelWg.Add(len(fetchers))
// Only now that the fetchers are registered on the cancellation WaitGroup
// can a concurrent Cancel wait for them instead of racing the registration;
// signal the beacon syncer that it's safe to cancel.
if beaconPing != nil {
close(beaconPing)
}
for _, fn := range fetchers {
go func() { defer d.cancelWg.Done(); errc <- fn() }()
}