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diff -rauN jdk10u-jdk-10.0.2+13/src/hotspot/share/utilities/bitMap.cpp jdk10u-jdk-10.0.2+13-bitmap-segv-patch/src/hotspot/share/utilities/bitMap.cpp
--- jdk10u-jdk-10.0.2+13/src/hotspot/share/utilities/bitMap.cpp 2018-06-24 16:07:06.000000000 +0200
+++ jdk10u-jdk-10.0.2+13-bitmap-segv-patch/src/hotspot/share/utilities/bitMap.cpp 2021-05-17 17:10:22.467980460 +0200
@@ -548,7 +548,9 @@
bm_word_t* dest_map = map();
const bm_word_t* other_map = other.map();
idx_t copy_words = word_index(size());
- Copy::disjoint_words((HeapWord*)other_map, (HeapWord*)dest_map, copy_words);
+ if (other_map != NULL) {
+ Copy::disjoint_words((HeapWord*)other_map, (HeapWord*)dest_map, copy_words);
+ }
idx_t rest = bit_in_word(size());
if (rest > 0) {
dest_map[copy_words] = merge_tail_of_map(other_map[copy_words],
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