What does

==752==ERROR: UndefinedBehaviorSanitizer: SEGV on unknown address 0x000000439000 (pc 0x000000428b5b bp 0x7ffdc38f56b0 sp 0x7ffdc38f5380 T752)
==752==The signal is caused by a READ memory access.
    #0 0x428b5a in crack /root/sandbox/crack.c:70:35
    #1 0x42804e in main /root/sandbox/crack.c:21:21
    #2 0x7ff3677e0b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
    #3 0x402b39 in _start (/root/sandbox/crack+0x402b39)

UndefinedBehaviorSanitizer can not provide additional info.

mean? (It's obviously an error).


It's a segmemtation fault.

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