$ eval ./expr-ubsan '9223372036854775807 \* -3'
expr.y:377:12: runtime error: signed integer overflow: 9223372036854775807 * -3 cannot be represented in type 'long'
-9223372036854775805

$ ./expr -only_ascii=1 -max_len=32 -dict=expr-dict expr_corpus/ 1>/dev/null 
Dictionary: 12 entries
INFO: Seed: 2332047193
INFO: Loaded 1 modules   (725 inline 8-bit counters): 725 [0x7a11f0, 0x7a14c5), 
INFO: Loaded 1 PC tables (725 PCs): 725 [0x579d18,0x57ca68), 
INFO:      269 files found in expr_corpus/
INFO: seed corpus: files: 269 min: 1b max: 31b total: 3629b rss: 29Mb
expr.y:377:12: runtime error: signed integer overflow: 9223172036854775807 * -3 cannot be represented in type 'long'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior expr.y:377:12 in 
MS: 0 ; base unit: 0000000000000000000000000000000000000000
0x39,0x32,0x32,0x33,0x31,0x37,0x32,0x30,0x33,0x36,0x38,0x35,0x34,0x37,0x37,0x35,0x38,0x30,0x37,0x20,0x2a,0x20,0x2d,0x33,
9223172036854775807 * -3
artifact_prefix='./'; Test unit written to ./crash-9c3dd31298882557484a14ce0261e7bfd38e882d
Base64: OTIyMzE3MjAzNjg1NDc3NTgwNyAqIC0z