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diff -uNr ceph-15.2.4/src/erasure-code/shec/ErasureCodeShec.cc ceph-15.2.4-fix_ErasureCodeShec/src/erasure-code/shec/ErasureCodeShec.cc
--- ceph-15.2.4/src/erasure-code/shec/ErasureCodeShec.cc 2020-07-01 01:10:51.000000000 +0930
+++ ceph-15.2.4-fix_ErasureCodeShec/src/erasure-code/shec/ErasureCodeShec.cc 2020-11-14 00:46:20.029488684 +1030
@@ -197,7 +197,10 @@
}
unsigned int k = get_data_chunk_count();
unsigned int m = get_chunk_count() - k;
- unsigned blocksize = (*chunks.begin()).second.length();
+ unsigned blocksize = 0;
+ if (chunks.size() > 0) {
+ blocksize = (*chunks.begin()).second.length();
+ }
for (unsigned int i = 0; i < k + m; i++) {
if (chunks.find(i) == chunks.end()) {
bufferlist tmp;
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