core/txpool/legacypool: handle missing head in reset (#27479)
Fixes #27301, a crash that could occur during txpool reorg handling.
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@ -1283,6 +1283,14 @@ func (pool *LegacyPool) reset(oldHead, newHead *types.Header) {
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"old", oldHead.Hash(), "oldnum", oldNum, "new", newHead.Hash(), "newnum", newNum)
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// We still need to update the current state s.th. the lost transactions can be readded by the user
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} else {
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if add == nil {
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// if the new head is nil, it means that something happened between
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// the firing of newhead-event and _now_: most likely a
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// reorg caused by sync-reversion or explicit sethead back to an
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// earlier block.
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log.Warn("New head missing in txpool reset", "number", newHead.Number, "hash", newHead.Hash())
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return
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}
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for rem.NumberU64() > add.NumberU64() {
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discarded = append(discarded, rem.Transactions()...)
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if rem = pool.chain.GetBlock(rem.ParentHash(), rem.NumberU64()-1); rem == nil {
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