Neovim exits with `Abort trap: 6`

- `nvim --version`: (from good commit)
```
NVIM v0.6.0-dev+14-gdf33f30e8
Build type: Release
LuaJIT 2.1.0-beta3
Compilation: /Library/Developer/CommandLineTools/usr/bin/cc -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNVIM_TS_HAS_SET_MATCH_LIMIT -O2 -DNDEBUG -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/Users/dhruvmanilawala/contributing/neovim/build/config -I/Users/dhruvmanilawala/contributing/neovim/src -I/Users/dhruvmanilawala/contributing/neovim/.deps/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include -I/usr/local/opt/gettext/include -I/Users/dhruvmanilawala/contributing/neovim/build/src/nvim/auto -I/Users/dhruvmanilawala/contributing/neovim/build/include
Compiled by dhruvmanilawala@mbp

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/Users/dhruvmanilawala/neovim/share/nvim"

Run :checkhealth for more info
```
- `nvim --version`: (from bad commit)
```
NVIM v0.6.0-dev+15-g3de777d25
Build type: Release
LuaJIT 2.1.0-beta3
Compilation: /Library/Developer/CommandLineTools/usr/bin/cc -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNVIM_TS_HAS_SET_MATCH_LIMIT -O2 -DNDEBUG -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/Users/dhruvmanilawala/contributing/neovim/build/config -I/Users/dhruvmanilawala/contributing/neovim/src -I/Users/dhruvmanilawala/contributing/neovim/.deps/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include -I/usr/local/opt/gettext/include -I/Users/dhruvmanilawala/contributing/neovim/build/src/nvim/auto -I/Users/dhruvmanilawala/contributing/neovim/build/include
Compiled by dhruvmanilawala@mbp

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/Users/dhruvmanilawala/neovim/share/nvim"

Run :checkhealth for more info
```
- Operating system/version: macOS Big Sur 11.3
- Terminal name/version: kitty 0.21.2 created by Kovid Goyal
- `$TERM`: ~`tmux-256color`~ `xterm-kitty`



### Steps to reproduce using `git bisect`

Neovim exits with `Abort trap: 6` from this commit https://github.com/neovim/neovim/commit/3de777d259c379e9fffdf4ebc6aba4059b7400fc which was found using `git bisect` from https://github.com/neovim/neovim/commit/79fe9dedcfede1d2038b47a21f21a995051deaa2 (bad commit) to [`release-0.5`](https://github.com/neovim/neovim/tree/release-0.5) (good commit).

NOTE: Using `brew install --HEAD neovim` works on the latest master.

### Stacktrace

From the first bad commit https://github.com/neovim/neovim/commit/3de777d259c379e9fffdf4ebc6aba4059b7400fc

```
Process:               nvim [75152]
Path:                  /Users/USER/*/nvim
Identifier:            nvim
Version:               0
Code Type:             X86-64 (Native)
Parent Process:        bash [74469]
User ID:               501

Date/Time:             2021-07-11 11:14:48.351 +0530
OS Version:            macOS 11.3 (20E232)
Report Version:        12
Bridge OS Version:     3.0 (14Y908)
Anonymous UUID:        A181BC59-3AFF-3C75-E620-6093F51B9673


Time Awake Since Boot: 8400 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:
abort() called

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff202fe946 __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff2032d615 pthread_kill + 263
2   libsystem_c.dylib             	0x00007fff20282411 abort + 120
3   libuv.1.dylib                 	0x0000000107561afa uv__signal_block_and_lock + 61
4   libuv.1.dylib                 	0x0000000107561568 uv__signal_start + 90
5   libuv.1.dylib                 	0x0000000107560439 uv_spawn + 473
6   libluv.1.dylib                	0x000000010752d117 luv_spawn + 2135
7   nvim                          	0x0000000106fa994d lj_BC_FUNCC + 68

Thread 1:
0   libsystem_kernel.dylib        	0x00007fff202fcc62 kevent + 10
1   nvim                          	0x0000000106f6f362 uv__io_poll + 1026 (kqueue.c:214)
2   nvim                          	0x0000000106f5e2c1 uv_run + 433 (core.c:375)
3   nvim                          	0x000000010735293e tui_main + 862
4   libsystem_pthread.dylib       	0x00007fff2032d954 _pthread_start + 224
5   libsystem_pthread.dylib       	0x00007fff203294a7 thread_start + 15

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x000000010e250e00  rcx: 0x00007ffee8ca8e98  rdx: 0x0000000000000000
  rdi: 0x0000000000000103  rsi: 0x0000000000000006  rbp: 0x00007ffee8ca8ec0  rsp: 0x00007ffee8ca8e98
   r8: 0x0000000000000000   r9: 0x0000000000000008  r10: 0x000000010e250e00  r11: 0x0000000000000246
  r12: 0x0000000000000103  r13: 0x0000000000000003  r14: 0x0000000000000006  r15: 0x0000000000000016
  rip: 0x00007fff202fe946  rfl: 0x0000000000000246  cr2: 0x000000010756495a
  
Logical CPU:     0
Error Code:      0x02000148
Trap Number:     133

Thread 0 instruction stream not available.

Thread 0 last branch register state not available.


Binary Images:
       0x106f54000 -        0x107407fff +nvim (0) <015A7DB5-EB84-35E7-9F48-77FF425DA9CF> /Users/USER/*/nvim
       0x10750d000 -        0x107518fff +libintl.8.dylib (0) <F1C4D8E0-D7AF-3BAD-A329-B9AB3241CA2D> /usr/local/opt/gettext/lib/libintl.8.dylib
       0x107527000 -        0x10753efff +libluv.1.dylib (0) <A3C71ED9-FA96-3E0B-B3FF-4CF08DBA2049> /usr/local/opt/luv/lib/libluv.1.dylib
       0x107553000 -        0x10756efff +libuv.1.dylib (0) <D5160993-D08E-376C-A444-680108D4BC1E> /usr/local/opt/libuv/lib/libuv.1.dylib
       0x107768000 -        0x10776ffff +libfzf.so (0) <F39F5E65-A221-3CE8-B44A-DF2DDD56287B> /Users/USER/*/libfzf.so
       0x10e179000 -        0x10e214fff  dyld (851.27) <7EAA668B-F906-3BAA-A980-139BBE6E8766> /usr/lib/dyld
    0x7fff20065000 -     0x7fff20066fff  libsystem_blocks.dylib (79) <1C8538C3-F2BE-3F02-89AE-E7052DE66D51> /usr/lib/system/libsystem_blocks.dylib
    0x7fff20067000 -     0x7fff2009cfff  libxpc.dylib (2038.100.48) <CFB56DA8-7462-3E8F-9CFB-20926C6A2BB5> /usr/lib/system/libxpc.dylib
    0x7fff2009d000 -     0x7fff200b4fff  libsystem_trace.dylib (1277.100.21) <1AAE1F8F-9F9D-3327-8A95-3A6887CED713> /usr/lib/system/libsystem_trace.dylib
    0x7fff200b5000 -     0x7fff20152fff  libcorecrypto.dylib (1000.100.38) <96A88875-7771-394E-A88E-389DCD02A935> /usr/lib/system/libcorecrypto.dylib
    0x7fff20153000 -     0x7fff2017ffff  libsystem_malloc.dylib (317.100.9) <029B5632-62B4-39F6-981C-BCA99C1FBF1D> /usr/lib/system/libsystem_malloc.dylib
    0x7fff20180000 -     0x7fff201c4fff  libdispatch.dylib (1271.100.5) <6B7B23E3-2FD4-3EA2-8A89-CE06244CCA98> /usr/lib/system/libdispatch.dylib
    0x7fff201c5000 -     0x7fff201fefff  libobjc.A.dylib (824) <929E3040-4605-3C14-885B-D742EF02F2CB> /usr/lib/libobjc.A.dylib
    0x7fff201ff000 -     0x7fff20201fff  libsystem_featureflags.dylib (28.60.1) <FEA91919-A5BB-3606-9445-F2077D90BF87> /usr/lib/system/libsystem_featureflags.dylib
    0x7fff20202000 -     0x7fff2028afff  libsystem_c.dylib (1439.100.3) <DF45CDEC-6B7E-3586-94B4-F3679A762661> /usr/lib/system/libsystem_c.dylib
    0x7fff2028b000 -     0x7fff202e0fff  libc++.1.dylib (905.6) <B027735F-B398-381C-84A7-606D7BBE4997> /usr/lib/libc++.1.dylib
    0x7fff202e1000 -     0x7fff202f6fff  libc++abi.dylib (905.6) <22AFC7FC-2DB6-3EF0-9CC0-EFFB9B65D5E2> /usr/lib/libc++abi.dylib
    0x7fff202f7000 -     0x7fff20326fff  libsystem_kernel.dylib (7195.101.1) <A78F60F4-ABD5-3646-93F9-1F1109C4552D> /usr/lib/system/libsystem_kernel.dylib
    0x7fff20327000 -     0x7fff20332fff  libsystem_pthread.dylib (454.100.8) <52F807B1-41A0-3D1E-AE89-115CA570863F> /usr/lib/system/libsystem_pthread.dylib
    0x7fff20333000 -     0x7fff2036efff  libdyld.dylib (851.27) <9F95C644-D1BD-38D9-9612-6188FE9EA53C> /usr/lib/system/libdyld.dylib
    0x7fff2036f000 -     0x7fff20378fff  libsystem_platform.dylib (254.80.2) <03429519-EBEA-3549-84A6-0FD426CB7373> /usr/lib/system/libsystem_platform.dylib
    0x7fff20379000 -     0x7fff203a4fff  libsystem_info.dylib (542.40.3) <C189F0D7-A430-328D-BD7F-7EB0FA023736> /usr/lib/system/libsystem_info.dylib
    0x7fff203a5000 -     0x7fff20842fff  com.apple.CoreFoundation (6.9 - 1775.118.101) <895AFD1C-0307-32B3-81CB-BA33DA368DE1> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
    0x7fff22509000 -     0x7fff22768fff  libicucore.A.dylib (66112) <478D57C3-FFF8-35E1-A64F-8490A616AB37> /usr/lib/libicucore.A.dylib
    0x7fff22769000 -     0x7fff22772fff  libsystem_darwin.dylib (1439.100.3) <28AB0CBC-61F6-3A01-BCE2-A53DA1AECB0F> /usr/lib/system/libsystem_darwin.dylib
    0x7fff22b88000 -     0x7fff22b93fff  libsystem_notify.dylib (279.40.4) <1AA89769-E07F-37CD-BBCF-6DBD345862EB> /usr/lib/system/libsystem_notify.dylib
    0x7fff24b15000 -     0x7fff24b23fff  libsystem_networkextension.dylib (1295.101.1) <33F45B5A-D346-3E7F-AB34-DFC4387E5A3C> /usr/lib/system/libsystem_networkextension.dylib
    0x7fff24b82000 -     0x7fff24b98fff  libsystem_asl.dylib (385) <4D4E0D4F-8B40-3ACC-85E1-16375966D6CC> /usr/lib/system/libsystem_asl.dylib
    0x7fff2625c000 -     0x7fff26263fff  libsystem_symptoms.dylib (1431.100.22) <226C631F-5380-395A-AA20-D686AEA05B9B> /usr/lib/system/libsystem_symptoms.dylib
    0x7fff2825f000 -     0x7fff2826ffff  libsystem_containermanager.dylib (318.100.4) <3BAF45DD-75D2-3D8A-845E-83A7058CBA08> /usr/lib/system/libsystem_containermanager.dylib
    0x7fff28f72000 -     0x7fff28f75fff  libsystem_configuration.dylib (1109.101.1) <49050F1E-3143-31B9-8B5C-FCCE4C6F23E5> /usr/lib/system/libsystem_configuration.dylib
    0x7fff28f76000 -     0x7fff28f7afff  libsystem_sandbox.dylib (1441.101.1) <24C8DF94-E258-3E24-AC96-2D1FB85F076A> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff29c6c000 -     0x7fff29c6efff  libquarantine.dylib (119.40.2) <FABCD375-2FD7-3FF5-9A28-452D8A323D3E> /usr/lib/system/libquarantine.dylib
    0x7fff2a217000 -     0x7fff2a21bfff  libsystem_coreservices.dylib (127) <A1451528-AD1D-3E86-93A9-1340535FAF46> /usr/lib/system/libsystem_coreservices.dylib
    0x7fff2a42b000 -     0x7fff2a472fff  libsystem_m.dylib (3186.100.3) <2F75F75F-DB36-3841-988F-48A7237ED6E9> /usr/lib/system/libsystem_m.dylib
    0x7fff2a473000 -     0x7fff2a473fff  libcharset.1.dylib (59) <5B967C5A-B6AC-322F-B731-4D653B8462B8> /usr/lib/libcharset.1.dylib
    0x7fff2a474000 -     0x7fff2a479fff  libmacho.dylib (980) <D503EC4A-6B6A-39C4-8218-9F4B6147A5BF> /usr/lib/system/libmacho.dylib
    0x7fff2a496000 -     0x7fff2a4a1fff  libcommonCrypto.dylib (60178.100.1) <EA0C1728-C905-3A58-A285-C32ECF903BB4> /usr/lib/system/libcommonCrypto.dylib
    0x7fff2a4a2000 -     0x7fff2a4acfff  libunwind.dylib (201) <32F74246-BEB8-3249-8C51-CAD863EF158E> /usr/lib/system/libunwind.dylib
    0x7fff2a4ad000 -     0x7fff2a4b4fff  liboah.dylib (203.42) <E3126D8C-F1F5-3E30-B7A2-0EB1AB0AF12D> /usr/lib/liboah.dylib
    0x7fff2a4b5000 -     0x7fff2a4bffff  libcopyfile.dylib (173.40.2) <DDE4BE71-76BA-3CDC-B3B0-F5E0BADF8FF2> /usr/lib/system/libcopyfile.dylib
    0x7fff2a4c0000 -     0x7fff2a4c7fff  libcompiler_rt.dylib (102.2) <AD12DBB0-8D0B-3D71-800D-E591A3CBE0D8> /usr/lib/system/libcompiler_rt.dylib
    0x7fff2a4c8000 -     0x7fff2a4cafff  libsystem_collections.dylib (1439.100.3) <8B0EA86C-AFA8-3B51-916F-7ED9A42669A4> /usr/lib/system/libsystem_collections.dylib
    0x7fff2a4cb000 -     0x7fff2a4cdfff  libsystem_secinit.dylib (87.60.1) <18494A83-796C-33D5-A6D0-BD4E0C2BBFC4> /usr/lib/system/libsystem_secinit.dylib
    0x7fff2a4ce000 -     0x7fff2a4d0fff  libremovefile.dylib (49.101.1) <DC4523F8-F5FF-3837-BD58-0AA8763F8FDE> /usr/lib/system/libremovefile.dylib
    0x7fff2a4d1000 -     0x7fff2a4d1fff  libkeymgr.dylib (31) <1A66B854-350D-3064-A606-2D9BFE71C400> /usr/lib/system/libkeymgr.dylib
    0x7fff2a4d2000 -     0x7fff2a4d9fff  libsystem_dnssd.dylib (1310.100.10) <600B1851-C1D4-3ACF-BE2A-99E7E40E6FC0> /usr/lib/system/libsystem_dnssd.dylib
    0x7fff2a4da000 -     0x7fff2a4dffff  libcache.dylib (83) <ED7D7EB4-B248-33A9-9E6A-58F45EAB7602> /usr/lib/system/libcache.dylib
    0x7fff2a4e0000 -     0x7fff2a4e1fff  libSystem.B.dylib (1292.100.5) <89E331F9-9A00-3EA4-B49F-FA2B91AE9182> /usr/lib/libSystem.B.dylib
    0x7fff2a4e2000 -     0x7fff2a4e5fff  libfakelink.dylib (3) <3EDDC5DA-6FAD-3031-91C1-E3465C34E643> /usr/lib/libfakelink.dylib
    0x7fff2a4e6000 -     0x7fff2a4e6fff  com.apple.SoftLinking (1.0 - 1) <82988A53-B066-3D39-A314-CE3C5C3868DE> /System/Library/PrivateFrameworks/SoftLinking.framework/Versions/A/SoftLinking
    0x7fff2a51f000 -     0x7fff2a60ffff  libiconv.2.dylib (59) <FFC919B8-AA34-3C59-9927-DD1345EF3F32> /usr/lib/libiconv.2.dylib
    0x7fff2ac88000 -     0x7fff2ac8bfff  libutil.dylib (58.40.2) <E3FE02FF-2812-3A42-8AAC-248A20F5414B> /usr/lib/libutil.dylib
    0x7fff2d8d6000 -     0x7fff2d8d6fff  liblaunch.dylib (2038.100.48) <3C5E58AF-F753-378B-8E0C-F3C9BB82E04D> /usr/lib/system/liblaunch.dylib
    0x7fff2fd5a000 -     0x7fff2fd5afff  libsystem_product_info_filter.dylib (8.40.1) <4CCFBF85-6483-364F-A8D6-A5D2956BEC52> /usr/lib/system/libsystem_product_info_filter.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    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: 0
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=517.9M resident=0K(0%) swapped_out_or_unallocated=517.9M(100%)
Writable regions: Total=81.4M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=81.4M(100%)
 
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Activity Tracing                   256K        1 
Kernel Alloc Once                    8K        1 
MALLOC                            61.7M       35 
MALLOC guard page                   16K        4 
MALLOC_LARGE (reserved)            860K        1         reserved VM address space (unallocated)
STACK GUARD                       56.0M        2 
Stack                             16.0M        2 
VM_ALLOCATE                       2504K       22 
__DATA                             659K       55 
__DATA_CONST                      3229K       46 
__DATA_DIRTY                        95K       24 
__LINKEDIT                       500.1M       11 
__OBJC_RO                         70.2M        1 
__OBJC_RW                         2480K        2 
__TEXT                            17.8M       55 
__UNICODE                          588K        1 
shared memory                        8K        2 
===========                     =======  ======= 
TOTAL                            732.2M      265 
TOTAL, minus reserved VM space   731.3M      265 
```

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Neovim exits with `Abort trap: 6` #15054

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Neovim exits with Abort trap: 6 #15054

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Neovim exits with `Abort trap: 6` #15054

Steps to reproduce using `git bisect`