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The following input demonstrates a crash:
==10182==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000018 (pc 0x00010aa9d9bb bp 0x7fff551882f0 sp 0x7fff551865a0 T0)
==10182==The signal is caused by a READ memory access.
==10182==Hint: address points to the zero page.
#0 0x10aa9d9ba in mrb_get_args class.c:555
#1 0x10aa828fc in mrb_ary_aset array.c:811
#2 0x10abdcf90 in mrb_vm_exec vm.c:1259
#3 0x10abd2619 in mrb_vm_run vm.c:823
#4 0x10ac048f9 in mrb_top_run vm.c:2614
#5 0x10acd57a5 in mrb_load_exec parse.y:5760
#6 0x10acd65b5 in mrb_load_file_cxt parse.y:5769
#7 0x10aa70066 in main mruby.c:227
#8 0x7fffbbbba234 in start (libdyld.dylib:x86_64+0x5234)
rax = 0x0000000000000018 rbx = 0x00007fff55186800 rcx = 0x0000000000000018 rdx = 0x0000100000000003
rdi = 0x00001c2800001400 rsi = 0x0000100000000000 rbp = 0x00007fff551882f0 rsp = 0x00007fff551865a0
r8 = 0x0000100000000000 r9 = 0x00007fff551865c0 r10 = 0x00007fff551865d0 r11 = 0x00007fff55186610
r12 = 0x00007fff55186670 r13 = 0x00007fff55186690 r14 = 0x00007fff55186630 r15 = 0x00007fff55186650
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV class.c:555 in mrb_get_args
Abort trap: 6
This issue was reported by https://hackerone.com/ssarong
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