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-rw-r--r--src/main.cpp16
1 files changed, 15 insertions, 1 deletions
diff --git a/src/main.cpp b/src/main.cpp
index 1015e538d5..f6a89fa2e6 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5717,7 +5717,21 @@ bool SendMessages(CNode* pto)
fRevertToInv = true;
break;
}
- assert(pBestIndex == NULL || pindex->pprev == pBestIndex);
+ if (pBestIndex != NULL && pindex->pprev != pBestIndex) {
+ // This means that the list of blocks to announce don't
+ // connect to each other.
+ // This shouldn't really be possible to hit during
+ // regular operation (because reorgs should take us to
+ // a chain that has some block not on the prior chain,
+ // which should be caught by the prior check), but one
+ // way this could happen is by using invalidateblock /
+ // reconsiderblock repeatedly on the tip, causing it to
+ // be added multiple times to vBlockHashesToAnnounce.
+ // Robustly deal with this rare situation by reverting
+ // to an inv.
+ fRevertToInv = true;
+ break;
+ }
pBestIndex = pindex;
if (fFoundStartingHeader) {
// add this to the headers message