stack-overflow in yaml_emitter_anchor_node

[nora-pxh]

In the current version (0.2.5) use the following file to run fuzz.
https://github.com/google/oss-fuzz/blob/master/projects/libyaml/libyaml_dumper_fuzzer.c

# 0 0x0000000000565c6f in yaml_emitter_anchor_node () at dumper.c:213
# 1 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 2 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 3 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 4 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 5 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 6 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 7 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 8 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
......
# 104756 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104757 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104758 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104759 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104760 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104761 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104762 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104763 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104764 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104765 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104766 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104767 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104768 0x0000000000565ee1 in yaml_emitter_anchor_node () at dumper.c:220
# 104769 0x0000000000565449 in yaml_emitter_dump () at dumper.c:145
# 104770 0x000000000055787f in LLVMFuzzerTestOneInput () at /src/libyaml_dumper_fuzzer.c:255
# 104771 0x000000000045ae54 in ExecuteCallback () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599
# 104772 0x00000000004465c3 in RunOneTest () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323
# 104773 0x000000000044c28f in FuzzerDriver () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856
# 104774 0x0000000000475d43 in main () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20