# Crystal crashed on a debug build

**URL:** <https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595>\
**Category:** Help & Support\
**Created:** [August 8, 2021, 1:04am UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595 "2021-08-08T01:04:13Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![elder-n00b](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/elder-n00b/32/1270_2.png) [@elder-n00b](https://forum.crystal-lang.org/u/elder-n00b)\
**Post date:** [August 8, 2021, 1:04am UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/1 "2021-08-08T01:04:14Z")

</div>

So, I have this small Crystal project that builds and works, and I wanted to try out debugging in VSCode, but when I did a debug build this is what I got:

```auto
Assertion failed: (Idx < NumElements && "Invalid element idx!"), function getElementOffset, file /var/cache/omnibus/src/llvm/llvm-10.0.0.src/include/llvm/IR/DataLayout.h, line 608.
/usr/local/bin/crystal: line 102: 3017 Abort trap: 6 "$INSTALL_DIR/embedded/bin/crystal" "$@"

```

and the quite lengthy dump from macOS:

> ****
>
> ```auto
> Process: crystal [3017]
> Path: /opt/crystal/*/crystal
> Identifier: crystal
> Version: 0
> Code Type: X86-64 (Native)
> Parent Process: ??? [3000]
> Responsible: crystal [3017]
> User ID: 502
> 
> Date/Time: 2021-08-08 00:32:23.576 +0200
> OS Version: Mac OS X 10.11.6 (15G22010)
> Report Version: 11
> 
> Time Awake Since Boot: 5900 seconds
> 
> System Integrity Protection: enabled
> 
> Crashed Thread: 0 Dispatch queue: com.apple.main-thread
> 
> Exception Type: EXC_CRASH (SIGABRT)
> Exception Codes: 0x0000000000000000, 0x0000000000000000
> Exception Note: EXC_CORPSE_NOTIFY
> 
> Application Specific Information:
> Assertion failed: (Idx < NumElements && "Invalid element idx!"), function getElementOffset, file /var/cache/omnibus/src/llvm/llvm-10.0.0.src/include/llvm/IR/DataLayout.h, line 608.
>  
> 
> Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
> 0 libsystem_kernel.dylib 0x00007fff9b828f06 __pthread_kill + 10
> 1 libsystem_pthread.dylib 0x00007fff94b334ec pthread_kill + 90
> 2 libsystem_c.dylib 0x00007fff998706df abort + 129
> 3 libsystem_c.dylib 0x00007fff99837dd8 __assert_rtn + 321
> 4 crystal 0x000000010e24564d LLVMOffsetOfElement.cold.2 + 35
> 5 crystal 0x000000010d7e2b9e LLVMOffsetOfElement + 65
> 6 crystal 0x000000010ca06287 *Crystal::CodeGenVisitor#get_debug_type<Crystal::Type+, Crystal::Type+>:(LibLLVMExt::Metadata | Nil) + 15447
> 7 crystal 0x000000010ca061df *Crystal::CodeGenVisitor#get_debug_type<Crystal::Type+, Crystal::Type+>:(LibLLVMExt::Metadata | Nil) + 15279
> 8 crystal 0x000000010ca061df *Crystal::CodeGenVisitor#get_debug_type<Crystal::Type+, Crystal::Type+>:(LibLLVMExt::Metadata | Nil) + 15279
> 9 crystal 0x000000010ca061df *Crystal::CodeGenVisitor#get_debug_type<Crystal::Type+, Crystal::Type+>:(LibLLVMExt::Metadata | Nil) + 15279
> 10 crystal 0x000000010ca0e85f *Crystal::CodeGenVisitor#declare_variable<String, Crystal::Type+, LLVM::Value, Crystal::Location, LLVM::BasicBlock>:Bool + 431
> 11 crystal 0x000000010ca6a21a *Crystal::CodeGenVisitor#alloca_non_closured_vars<(Hash(String, Crystal::MetaVar)+ | Nil), Crystal::Block, Nil, Bool>:Nil + 1066
> 12 crystal 0x000000010ca59732 *Crystal::CodeGenVisitor#visit<Crystal::Call>:Bool + 2930
> 13 crystal 0x000000010ca364a4 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 14836
> 14 crystal 0x000000010ca4a2a3 *Crystal::CodeGenVisitor#codegen_fun<String, Crystal::Def+, Crystal::Type+, Bool, Crystal::CodeGenVisitor::ModuleInfo, Bool, Bool>:LLVM::Function + 4595
> 15 crystal 0x000000010ca66538 *Crystal::CodeGenVisitor#target_def_fun<Crystal::Def+, Crystal::Type+>:LLVM::Function + 2392
> 16 crystal 0x000000010ca5948c *Crystal::CodeGenVisitor#visit<Crystal::Call>:Bool + 2252
> 17 crystal 0x000000010ca364a4 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 14836
> 18 crystal 0x000000010ca791f7 *Crystal::CodeGenVisitor#visit<Crystal::Assign>:(Bool | Nil) + 311
> 19 crystal 0x000000010ca33089 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 1497
> 20 crystal 0x000000010ca3318c *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 1756
> 21 crystal 0x000000010ca4a2a3 *Crystal::CodeGenVisitor#codegen_fun<String, Crystal::Def+, Crystal::Type+, Bool, Crystal::CodeGenVisitor::ModuleInfo, Bool, Bool>:LLVM::Function + 4595
> 22 crystal 0x000000010ca66538 *Crystal::CodeGenVisitor#target_def_fun<Crystal::Def+, Crystal::Type+>:LLVM::Function + 2392
> 23 crystal 0x000000010ca5948c *Crystal::CodeGenVisitor#visit<Crystal::Call>:Bool + 2252
> 24 crystal 0x000000010ca364a4 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 14836
> 25 crystal 0x000000010ca64737 *Crystal::CodeGenVisitor#prepare_call_args_non_external<Crystal::Call, Crystal::Def+, Crystal::Type+>:Tuple(Array(LLVM::Value), Bool) + 2007
> 26 crystal 0x000000010ca59143 *Crystal::CodeGenVisitor#visit<Crystal::Call>:Bool + 1411
> 27 crystal 0x000000010ca364a4 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 14836
> 28 crystal 0x000000010ca4a2a3 *Crystal::CodeGenVisitor#codegen_fun<String, Crystal::Def+, Crystal::Type+, Bool, Crystal::CodeGenVisitor::ModuleInfo, Bool, Bool>:LLVM::Function + 4595
> 29 crystal 0x000000010ca66538 *Crystal::CodeGenVisitor#target_def_fun<Crystal::Def+, Crystal::Type+>:LLVM::Function + 2392
> 30 crystal 0x000000010ca5948c *Crystal::CodeGenVisitor#visit<Crystal::Call>:Bool + 2252
> 31 crystal 0x000000010ca364a4 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 14836
> 32 crystal 0x000000010ca36845 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 15765
> 33 crystal 0x000000010ca791f7 *Crystal::CodeGenVisitor#visit<Crystal::Assign>:(Bool | Nil) + 311
> 34 crystal 0x000000010ca33089 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 1497
> 35 crystal 0x000000010ca3318c *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 1756
> 36 crystal 0x000000010ca4a2a3 *Crystal::CodeGenVisitor#codegen_fun<String, Crystal::Def+, Crystal::Type+, Bool, Crystal::CodeGenVisitor::ModuleInfo, Bool, Bool>:LLVM::Function + 4595
> 37 crystal 0x000000010ca66538 *Crystal::CodeGenVisitor#target_def_fun<Crystal::Def+, Crystal::Type+>:LLVM::Function + 2392
> 38 crystal 0x000000010ca5948c *Crystal::CodeGenVisitor#visit<Crystal::Call>:Bool + 2252
> 39 crystal 0x000000010ca364a4 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 14836
> 40 crystal 0x000000010ca36845 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 15765
> 41 crystal 0x000000010ca368c2 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 15890
> 42 crystal 0x000000010ca3318c *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 1756
> 43 crystal 0x000000010ca4a2a3 *Crystal::CodeGenVisitor#codegen_fun<String, Crystal::Def+, Crystal::Type+, Bool, Crystal::CodeGenVisitor::ModuleInfo, Bool, Bool>:LLVM::Function + 4595
> 44 crystal 0x000000010ca66538 *Crystal::CodeGenVisitor#target_def_fun<Crystal::Def+, Crystal::Type+>:LLVM::Function + 2392
> 45 crystal 0x000000010ca5948c *Crystal::CodeGenVisitor#visit<Crystal::Call>:Bool + 2252
> 46 crystal 0x000000010ca364a4 *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 14836
> 47 crystal 0x000000010ca3318c *Crystal::ASTNode+@Crystal::ASTNode#accept<Crystal::CodeGenVisitor>:Nil + 1756
> 48 crystal 0x000000010c9d8781 *Crystal::Compiler#codegen<Crystal::Program, Crystal::ASTNode+, Array(Crystal::Compiler::Source), String>:(Tuple(Array(Crystal::Compiler::CompilationUnit), Array(String)) | Nil) + 193
> 49 crystal 0x000000010ce47777 *Crystal::Compiler#compile<Array(Crystal::Compiler::Source), String>:Crystal::Compiler::Result + 135
> 50 crystal 0x000000010ce34078 *Crystal::Command#run:(Bool | Nil) + 600
> 51 crystal 0x000000010c414501 __crystal_main + 17249
> 
> Thread 1:
> 0 libsystem_kernel.dylib 0x00007fff9b828db6 __psynch_cvwait + 10
> 1 libsystem_pthread.dylib 0x00007fff94b31728 _pthread_cond_wait + 767
> 2 crystal 0x000000010e02cc37 GC_wait_marker + 23
> 3 crystal 0x000000010e023435 GC_help_marker + 37
> 4 crystal 0x000000010e02aebf GC_mark_thread + 143
> 5 libsystem_pthread.dylib 0x00007fff94b3099d _pthread_body + 131
> 6 libsystem_pthread.dylib 0x00007fff94b3091a _pthread_start + 168
> 7 libsystem_pthread.dylib 0x00007fff94b2e351 thread_start + 13
> 
> Thread 0 crashed with X86 Thread State (64-bit):
> rax: 0x0000000000000000 rbx: 0x0000000000000006 rcx: 0x00007fff537e8318 rdx: 0x0000000000000000
> rdi: 0x000000000000050f rsi: 0x0000000000000006 rbp: 0x00007fff537e8340 rsp: 0x00007fff537e8318
> r8: 0x0000000000000000 r9: 0x0000000000000260 r10: 0x0000000008000000 r11: 0x0000000000000206
> r12: 0x000000010e793d69 r13: 0x000000011e079000 r14: 0x00007fff7a9ab000 r15: 0x000000010e793b3c
> rip: 0x00007fff9b828f06 rfl: 0x0000000000000206 cr2: 0x0000000129382000
>   
> Logical CPU: 0
> Error Code: 0x02000131
> Trap Number: 133
> 
> Binary Images:
> 0x10c40e000 - 0x10e91bfff +crystal (0) <82C20D53-358D-3276-BCC9-50016DADD1CC> /opt/crystal/*/crystal
> 0x7fff6d66d000 - 0x7fff6d6a4a47 dyld (360.22) <6B9CD3BA-2D60-3629-A0CB-AB810F55E8DD> /usr/lib/dyld
> 0x7fff89436000 - 0x7fff89438ff7 libquarantine.dylib (80) <5B351BEC-27CC-3935-82F3-A065CC764255> /usr/lib/system/libquarantine.dylib
> 0x7fff8a432000 - 0x7fff8a4a9feb libcorecrypto.dylib (335.50.2) <4E339108-3997-39D3-BB58-C5A0340E3651> /usr/lib/system/libcorecrypto.dylib
> 0x7fff8be5b000 - 0x7fff8be84ff7 libxpc.dylib (765.70.2) <7978B4D9-7970-3302-87FA-75709127DBD2> /usr/lib/system/libxpc.dylib
> 0x7fff8c4dd000 - 0x7fff8c4e0ffb libdyld.dylib (360.22) <E0CE4C3B-38DF-37FB-A74E-866938E1AF92> /usr/lib/system/libdyld.dylib
> 0x7fff8e3bc000 - 0x7fff8e3c4ffb libsystem_dnssd.dylib (625.60.5) <8BE2BAFE-B2A3-38FA-A960-F6884217F54D> /usr/lib/system/libsystem_dnssd.dylib
> 0x7fff8e494000 - 0x7fff8e495fff libsystem_blocks.dylib (65) <1244D9D5-F6AA-35BB-B307-86851C24B8E5> /usr/lib/system/libsystem_blocks.dylib
> 0x7fff8e496000 - 0x7fff8e49afff libcache.dylib (75) <9548AAE9-2AB7-3525-9ECE-A2A7C4688447> /usr/lib/system/libcache.dylib
> 0x7fff8e49b000 - 0x7fff8e49dfff libsystem_coreservices.dylib (19.2) <1B3F5AFC-FFCD-3ECB-8B9A-5538366FB20D> /usr/lib/system/libsystem_coreservices.dylib
> 0x7fff8f531000 - 0x7fff8f534fff libsystem_sandbox.dylib (460.60.4) <71D697CA-7339-37C7-8DAF-3BAA1D57B56A> /usr/lib/system/libsystem_sandbox.dylib
> 0x7fff8f5e4000 - 0x7fff8f5ecfff libcopyfile.dylib (127) <A48637BC-F3F2-34F2-BB68-4C65FD012832> /usr/lib/system/libcopyfile.dylib
> 0x7fff8fe62000 - 0x7fff8fe67ff3 libunwind.dylib (35.3) <F6EB48E5-4D12-359A-AB54-C937FBBE9043> /usr/lib/system/libunwind.dylib
> 0x7fff90249000 - 0x7fff90249ff7 libunc.dylib (29) <DDB1E947-C775-33B8-B461-63E5EB698F0E> /usr/lib/system/libunc.dylib
> 0x7fff902d5000 - 0x7fff902ddfef libsystem_platform.dylib (74.40.2) <29A905EF-6777-3C33-82B0-6C3A88C4BA15> /usr/lib/system/libsystem_platform.dylib
> 0x7fff90dec000 - 0x7fff90e3fff7 libc++.1.dylib (120.1) <8FC3D139-8055-3498-9AC5-6467CB7F4D14> /usr/lib/libc++.1.dylib
> 0x7fff91408000 - 0x7fff914f7ffb libxml2.2.dylib (29.18) <021E7870-E3F8-30CB-B821-F8DAFB543104> /usr/lib/libxml2.2.dylib
> 0x7fff914f8000 - 0x7fff91509ff7 libz.1.dylib (61.20.1) <B3EBB42F-48E3-3287-9F0D-308E04D407AC> /usr/lib/libz.1.dylib
> 0x7fff91685000 - 0x7fff91686ffb libremovefile.dylib (41) <552EF39E-14D7-363E-9059-4565AC2F894E> /usr/lib/system/libremovefile.dylib
> 0x7fff9233e000 - 0x7fff927b4fff com.apple.CoreFoundation (6.9 - 1259.22) <53EFA4A7-4614-383E-BEEE-B8B9D9D19FFA> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
> 0x7fff9385b000 - 0x7fff9385bff7 libkeymgr.dylib (28) <8371CE54-5FDD-3CE9-B3DF-E98C761B6FE0> /usr/lib/system/libkeymgr.dylib
> 0x7fff94b2d000 - 0x7fff94b36ff7 libsystem_pthread.dylib (138.10.4) <62FC23B9-1DEE-3918-A30D-A58EC95A0720> /usr/lib/system/libsystem_pthread.dylib
> 0x7fff94eda000 - 0x7fff94edcff7 libsystem_configuration.dylib (802.40.13) <B815C622-96EF-388A-823B-B02618E7F190> /usr/lib/system/libsystem_configuration.dylib
> 0x7fff950f6000 - 0x7fff9510dff7 libsystem_asl.dylib (323.50.1) <41F8E11F-1BD0-3F1D-BA3A-AA1577ED98A9> /usr/lib/system/libsystem_asl.dylib
> 0x7fff954ea000 - 0x7fff954eaff7 liblaunch.dylib (765.70.2) <4B800A8C-6C75-3279-92E0-FBA668812B55> /usr/lib/system/liblaunch.dylib
> 0x7fff96ef8000 - 0x7fff96f03ff7 libcommonCrypto.dylib (60075.50.1) <E48A81E7-56B0-37F5-9611-E896B8E16B4D> /usr/lib/system/libcommonCrypto.dylib
> 0x7fff97ca0000 - 0x7fff9800b657 libobjc.A.dylib (680) <D55D5807-1FBE-32A5-9105-44D7AFE68C27> /usr/lib/libobjc.A.dylib
> 0x7fff98a38000 - 0x7fff98a62ff7 libc++abi.dylib (307.4) <D24E06BF-6522-3C4A-BD0C-11C42BA4D8E8> /usr/lib/libc++abi.dylib
> 0x7fff98f03000 - 0x7fff98f49ff7 libauto.dylib (186) <999E610F-41FC-32A3-ADCA-5EC049B65DFB> /usr/lib/libauto.dylib
> 0x7fff99292000 - 0x7fff992f8ff7 libsystem_network.dylib (583.50.1) <B52DAB73-92DC-3DA7-B9F4-B899D66445C1> /usr/lib/system/libsystem_network.dylib
> 0x7fff993ba000 - 0x7fff993bbfff libsystem_secinit.dylib (20) <32B1A8C6-DC84-3F4F-B8CE-9A52B47C3E6B> /usr/lib/system/libsystem_secinit.dylib
> 0x7fff99812000 - 0x7fff9989ffef libsystem_c.dylib (1082.60.1) <0F0C7ED5-3902-3427-9C1D-E2F130B528C5> /usr/lib/system/libsystem_c.dylib
> 0x7fff9a207000 - 0x7fff9a218ff7 libsystem_trace.dylib (201.10.3) <0ED15BED-B1F8-3845-9EC1-CC0B54B6BF1B> /usr/lib/system/libsystem_trace.dylib
> 0x7fff9abdd000 - 0x7fff9abe4ff7 libcompiler_rt.dylib (62) <A13ECF69-F59F-38AE-8609-7B731450FBCD> /usr/lib/system/libcompiler_rt.dylib
> 0x7fff9b5dc000 - 0x7fff9b60bfc3 libsystem_m.dylib (3105) <8A645D53-92DD-3C2E-8AFA-F28BC63E3657> /usr/lib/system/libsystem_m.dylib
> 0x7fff9b812000 - 0x7fff9b830ff7 libsystem_kernel.dylib (3248.73.11) <4810EB90-DEEB-3E89-9ACA-BECC351E72F0> /usr/lib/system/libsystem_kernel.dylib
> 0x7fff9b86c000 - 0x7fff9b875ff3 libsystem_notify.dylib (150.40.1) <D48BDE34-0F7E-34CA-A0FF-C578E39987CC> /usr/lib/system/libsystem_notify.dylib
> 0x7fff9ba0f000 - 0x7fff9ba10fff libDiagnosticMessagesClient.dylib (100) <4243B6B4-21E9-355B-9C5A-95A216233B96> /usr/lib/libDiagnosticMessagesClient.dylib
> 0x7fff9bad0000 - 0x7fff9baecff7 libsystem_malloc.dylib (67.40.1) <5748E8B2-F81C-34C6-8B13-456213127678> /usr/lib/system/libsystem_malloc.dylib
> 0x7fff9c9b0000 - 0x7fff9caa2ff7 libiconv.2.dylib (44) <F05A0A5A-92A9-3668-8F20-F27CBDA26BE9> /usr/lib/libiconv.2.dylib
> 0x7fff9cac1000 - 0x7fff9cac2ffb libSystem.B.dylib (1226.10.1) <9A358336-F9EE-301B-A00D-D91C591BA684> /usr/lib/libSystem.B.dylib
> 0x7fff9cac4000 - 0x7fff9cadbff7 libsystem_coretls.dylib (83.40.5) <C90DAE38-4082-381C-A185-2A6A8B677628> /usr/lib/system/libsystem_coretls.dylib
> 0x7fff9cadc000 - 0x7fff9cb09fff libdispatch.dylib (501.40.12) <C7499857-61A5-3D7D-A5EA-65DCC8C3DF92> /usr/lib/system/libdispatch.dylib
> 0x7fff9db4e000 - 0x7fff9dd5bfff libicucore.A.dylib (551.51.6) <142B2AD5-0A50-3382-8213-096E925863F7> /usr/lib/libicucore.A.dylib
> 0x7fff9e3fc000 - 0x7fff9e425fff libsystem_info.dylib (477.50.4) <FAA9226D-64DE-3769-A6D8-6CABA4B7FF4D> /usr/lib/system/libsystem_info.dylib
> 0x7fff9e8fe000 - 0x7fff9e906fff libsystem_networkextension.dylib (385.40.36) <66095DC7-6539-38F2-95EE-458F15F6D014> /usr/lib/system/libsystem_networkextension.dylib
> 0x7fff9ea88000 - 0x7fff9ea8dff7 libmacho.dylib (875.1) <318264FA-58F1-39D8-8285-1F6254EE410E> /usr/lib/system/libmacho.dylib
> 
> External Modification Summary:
> Calls made by other processes targeting this process:
> task_for_pid: 1
> thread_create: 0
> thread_set_state: 0
> Calls made by this process:
> task_for_pid: 0
> thread_create: 0
> thread_set_state: 0
> Calls made by all processes on this machine:
> task_for_pid: 11379
> thread_create: 0
> thread_set_state: 0
> 
> VM Region Summary:
> ReadOnly portion of Libraries: Total=164.9M resident=0K(0%) swapped_out_or_unallocated=164.9M(100%)
> Writable regions: Total=347.6M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=347.6M(100%)
>  
> VIRTUAL REGION 
> REGION TYPE SIZE COUNT (non-coalesced) 
> =========== ======= ======= 
> Activity Tracing 2048K 2 
> Kernel Alloc Once 4K 2 
> MALLOC 115.3M 21 
> MALLOC guard page 16K 4 
> MALLOC_LARGE (reserved) 128K 2 reserved VM address space (unallocated)
> Process Corpse Info 2048K 2 
> STACK GUARD 56.0M 3 
> Stack 8712K 3 
> VM_ALLOCATE 219.5M 16 
> __DATA 7096K 48 
> __LINKEDIT 111.8M 4 
> __TEXT 53.0M 48 
> __UNICODE 552K 2 
> shared memory 8K 3 
> =========== ======= ======= 
> TOTAL 575.8M 146 
> TOTAL, minus reserved VM space 575.7M 146 
> 
> Model: iMac8,1, BootROM IM81.00C1.B00, 2 processors, Intel Core 2 Duo, 2.66 GHz, 4 GB, SMC 1.29f1
> Graphics: ATI Radeon HD 2600 Pro, ATI Radeon HD 2600 Pro, PCIe, 256 MB
> Memory Module: BANK 0/DIMM0, 2 GB, DDR2 SDRAM, 800 MHz, 0x7F7F7F7F7F5D0000, 0x436F6D707553746F63782843535829000000
> Memory Module: BANK 1/DIMM1, 2 GB, DDR2 SDRAM, 800 MHz, 0x7F7F7F7F7F5D0000, 0x436F6D707553746F63782843535829000000
> AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8C), Broadcom BCM43xx 1.0 (5.10.131.39.16)
> Bluetooth: Version 4.4.6f4, 3 services, 27 devices, 1 incoming serial ports
> Network Service: Ethernet, Ethernet, en0
> Serial ATA Device: Hitachi HDP725032GLA380, 320.07 GB
> Parallel ATA Device: PIONEER DVD-RW DVR-K06A
> USB Device: USB 2.0 Bus
> USB Device: USB 2.0 Bus
> USB Device: Built-in iSight
> USB Device: USB2.0 Hub
> USB Device: USB OPTICAL MOUSE
> USB Device: HID compliant keyboard
> USB Device: USB Bus
> USB Device: BRCM2046 Hub
> USB Device: Bluetooth USB Host Controller
> USB Device: USB Bus
> USB Device: USB Bus
> USB Device: USB Bus
> USB Device: USB Bus
> USB Device: IR Receiver
> Thunderbolt Bus: 
> 
> ```

I could not find another project triggering this error.  
I could not yet determine what exactly in my code triggers this problem.  
I found the offending commit but it will take me some time before I get what’s going on.  
I’ll see if I can reproduce the issue with minimal code, not sure about it though.  
(Where did I read about a “bisect” tool that would try to take care of that?)

I ask if it rings a bell and some advice to find out what I’m doing wrong.

---

<div class="post-metadata">

**Author:** ![maxfierke](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/maxfierke/32/1209_2.png) [@maxfierke](https://forum.crystal-lang.org/u/maxfierke)\
**Post date:** [August 9, 2021, 4:34pm UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/2 "2021-08-09T16:34:05Z")

</div>

This is almost certainly either a compiler bug and/or LLVM codegen bug. (I also run into it in debug on a project of mine with LLVM 10 builds) What method are you using to obtain Crystal (e.g. Homebrew, the distribution bundle, etc.)? If the distribution bundle, I would try getting it from Homebrew, which uses LLVM 11 I believe, and seeing if its still an issue.

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<div class="post-metadata">

**Author:** ![elder-n00b](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/elder-n00b/32/1270_2.png) [@elder-n00b](https://forum.crystal-lang.org/u/elder-n00b)\
**Post date:** [August 9, 2021, 10:20pm UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/3 "2021-08-09T22:20:20Z")

</div>

Got the .pkg distribution from the website. Sorry I forgot to post Crystal version. Yes it’s LLVM 10:

```auto
Crystal 1.1.1 [6d9a1d583] (2021-07-26)

LLVM: 10.0.0
Default target: x86_64-apple-macosx

```

> **rant**
>
> As for Homebrew, no. I have macOS 10.11.6 and it hates old systems with a passion. I've been happy with it until last year or so, but recently if I upgrade or install anything (which means upgrade something else in practice) it almost consistently clobbers some previously functioning packages, and they say it's by design, so... good bye m\*ssing package manager.
> 
> It would indeed use LLVM 11 though.

The bright side is, I’ll have to find out what the problem is… or wait next release, whichever comes first.

No problem anyway, some well placed `p!`s are good enough in most cases.

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<div class="post-metadata">

**Author:** ![maxfierke](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/maxfierke/32/1209_2.png) [@maxfierke](https://forum.crystal-lang.org/u/maxfierke)\
**Post date:** [August 10, 2021, 12:53am UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/4 "2021-08-10T00:53:52Z")

</div>

I think historically the LLVM version has been bumped rarely on the macOS builds since it’s most often just used for bootstrapping the compiler from source for either Homebrew or Nix builds or compiler development (though this seems like a real bug that might warrant a jump if possible), so I wouldn’t necessarily hold out for that

I’m not sure what the macOS version support is for Nix, but perhaps 10.11 is still supported? You could give the Nix builds ago and have a better shot at regular LLVM updates with it. See here to get started: [crystal/shell.nix at master · crystal-lang/crystal · GitHub](https://github.com/crystal-lang/crystal/blob/master/shell.nix)

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<div class="post-metadata">

**Author:** ![elder-n00b](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/elder-n00b/32/1270_2.png) [@elder-n00b](https://forum.crystal-lang.org/u/elder-n00b)\
**Post date:** [August 10, 2021, 9:07pm UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/5 "2021-08-10T21:07:00Z")

</div>

Thanks for pointing me to Nix, looks impressive. I’m still perusing the documentation before going on.  
Actually I’ve heard of it before, but for some reason I thought it was only the package manager for the NixOS distro and just bookmarked it in the “maybe will look at this one day” dustbin.  
That said, it seems to me that the linked nix script would use LLVM 10.  
But if crystal builds with 11 that’s not a problem, I see there are packages for 11 and 12 too.

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<div class="post-metadata">

**Author:** ![maxfierke](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/maxfierke/32/1209_2.png) [@maxfierke](https://forum.crystal-lang.org/u/maxfierke)\
**Post date:** [August 10, 2021, 9:23pm UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/6 "2021-08-10T21:23:25Z")

</div>

yep, it should build with 11 okay at this point. I _think_ all the major-showstoppers were fixed, but it looks like the nix script just hasn’t been updated. 12 should be okay on `master`, but wasn’t merged before `1.1.0` was released, so if you’re building a tagged release it probably won’t work. That being said, since you’re on `10.11`, you could also probably pretty safely use all the way back to LLVM 6 no problem.

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<div class="post-metadata">

**Author:** ![beta-ziliani](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.crystal-lang.org/beta-ziliani/32/1821_2.png) [@beta-ziliani](https://forum.crystal-lang.org/u/beta-ziliani)\
**Post date:** [August 11, 2021, 8:38pm UTC](https://forum.crystal-lang.org/t/crystal-crashed-on-a-debug-build/3595/7 "2021-08-11T20:38:57Z")

</div>

One thing though: LLVM 11 is only good on Homebrew, and LLVM 12 will not be supported. The reason is that LLVM 11 and 12 are shipped with a bug that prevent Crystal from working properly. The patch exists, but only landed for LLVM 13. The exception is Homebrew’s LLVM 11 because @bcardiff requested HB to add the patch.