Kitty: Diff kitten crashes with segmentation fault on MacOS

[vogre]

Using kitty 0.14.4 (also present in 0.14.3).
OS version 10.14.6.

Seen on exit (when hitting q) when using any pair of files.

Trace (with no debug):

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   _queue.cpython-37m-darwin.so    0x00000001099a862f 0x1099a7000 + 5679
1   org.python.python               0x000000010846fd18 dict_dealloc + 126
2   org.python.python               0x0000000108486dd5 subtype_dealloc + 1052
3   org.python.python               0x000000010846fd18 dict_dealloc + 126
4   org.python.python               0x0000000108490332 subtype_clear + 142
5   org.python.python               0x00000001085210b9 collect + 1948
6   org.python.python               0x000000010852090c _PyGC_CollectNoFail + 55
7   org.python.python               0x00000001084f6c78 PyImport_Cleanup + 1516
8   org.python.python               0x000000010850142b Py_FinalizeEx + 116
9   kitty                           0x000000010842cab9 main + 1465
10  libdyld.dylib                   0x00007fff5f54d3d5 start + 1

[kovidgoyal]

Are you using the official kitty binaries or some other build?
Because that crash is in the python cleanup routines, and is not
reproducible with the official builds.

[vogre]

I was using the homebrew cask which seems to install the same .dmg. The crash doesn't occur if I'm installing the .dmg manually or using installer.sh, and reproduces if I remove the manually installed kitty and reinstall with homebrew.

Closing since this seems like an issue with homebrew.

Thanks!

[minusf]

i am receiving this crash with the github .dmg the same way as with brew cask, can we reopen this, or should i open a new issue? the stack trace is more or less the same.

[kovidgoyal]

I still cannot reproduce it. Make sure you have properly clened out all different kitty installations and are running only th eofficial binaries.

[minusf]

there are only official binaries... brew cask does not generate their own dmg file, it simply fetches the one you provide under releases:

cask 'kitty' do
  version '0.15.0'
  sha256 'e36e0e92dec48215d2ffdb1e467c69fea98018534d2acc718a9fbfb3dbe5d2e0'

  url "https://github.com/kovidgoyal/kitty/releases/download/v#{version}/kitty-#{version}.dmg"

...

[kovidgoyal]

The point is to have only ONE single kitty installation. From the
official dmg and not other pices of kitty left over anywhere.

[minusf]

$ find / -name kitty
/usr/local/Caskroom/kitty
/Applications/kitty.app/Contents/Frameworks/kitty
/Applications/kitty.app/Contents/Frameworks/kitty/kitty
/Applications/kitty.app/Contents/Frameworks/kitty/kitty/launcher/kitty
/Applications/kitty.app/Contents/MacOS/kitty
/Users/user/.config/kitty
/Users/user/Library/Caches/kitty

[kovidgoyal]

rm -rf /usr/local/Caskrom/kitty
curl -L https://sw.kovidgoyal.net/kitty/installer.sh | sh /dev/stdin

[minusf]

i have narrowed down the issue. the single difference between brew cask install kitty and either the installer or a manual download and drag and drop into Applications is the convenience symlink setup by brew:

$ which kitty
/usr/local/bin/kitty
$ ls -la /usr/local/bin/kitty
lrwxr-xr-x  1 user  admin  44  3 Dec 12:25 /usr/local/bin/kitty@ -> /Applications/kitty.app/Contents/MacOS/kitty

when kitty diff is called through this symlink, it results in the segmentation fault. If the full Applications/kitty.app/Contents/MacOS/kitty path is used, there is no segmentation fault.

[kovidgoyal]

I tried the following steps inside a kitty terminal:

ln -s /Applications/kitty.app/Contents/MacOS/kitty kitty
./kitty +kitten diff index-1.html index-2.html
Pressed q to quit the kitten
No segfault

[wookayin]

For me:

No segfault (works well:

/Applications/kitty.app/Contents/MacOS/kitty +kitten diff FILE1 FILE2

Segfault (default behavior):

kitty +kitten diff install.py bin/dotfiles
# kitty -> /usr/local/bin/kitty

Kitty 0.16.0 installed from homebrew. I think feel this should be open (/cc @vogre), even though it was installed via homebrew we may want to have a fix for this.

[midchildan]

I can reproduce the segfault if the symlink is placed in /usr/local/bin. It's not reproducible if the symlink is placed anywhere else. Looking at the crash log, it looks like kitty is loading Homebrew's Python in memory when launched from /usr/local/bin, which is the likely cause of this issue.

The relevant line from the crash log:

 0x110135fff +org.python.python (3.7.7, [c] 2001-2019 Python Software Foundation. - 3.7.7) <AE824497-907F-354C-BD7F-EBC688E37019> /usr/local/Cellar/python/3.7.7/Frameworks/Python.framework/Versions/3.7/Python

The full version:

Process:               kitty [72137]
Path:                  /Applications/kitty.app/Contents/MacOS/kitty
Identifier:            kitty
Version:               0
Code Type:             X86-64 (Native)
Parent Process:        zsh [67146]
Responsible:           kitty [72137]
User ID:               501

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [72137]

VM Regions Near 0:
--> 
    __TEXT                 000000010ffa7000-000000010ffa9000 [    8K] r-x/rwx SM=COW  /Applications/kitty.app/Contents/MacOS/kitty

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   _queue.cpython-37m-darwin.so    0x000000011163462f 0x111633000 + 5679
1   org.python.python               0x000000010ffed689 dict_dealloc + 126
2   org.python.python               0x000000011000455e subtype_dealloc + 1052
3   org.python.python               0x000000010ffed689 dict_dealloc + 126
4   org.python.python               0x000000011000da08 subtype_clear + 142
5   org.python.python               0x000000011009ea1f collect + 1886
6   org.python.python               0x000000011009e2b0 _PyGC_CollectNoFail + 55
7   org.python.python               0x00000001100747d3 PyImport_Cleanup + 1516
8   org.python.python               0x000000011007ef2a Py_FinalizeEx + 116
9   kitty                           0x000000010ffa8ab9 main + 1465
10  libdyld.dylib                   0x00007fff692353d5 start + 1

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000111694cb0  rbx: 0x000000011162b710  rcx: 0x0000000000000000  rdx: 0x00007fd6b8623080
  rdi: 0x000000011162b710  rsi: 0x00000001115fd490  rbp: 0x00007ffedfc52b60  rsp: 0x00007ffedfc52b50
   r8: 0x000000000000003f   r9: 0x00007fd6b85994e0  r10: 0x00000000000000cb  r11: 0x00000000000000cb
  r12: 0x00007fd6b8500990  r13: 0x00000001116b2b70  r14: 0x0000000000000001  r15: 0x00000001116b2af0
  rip: 0x000000011163462f  rfl: 0x0000000000010282  cr2: 0x0000000000000000

Logical CPU:     0
Error Code:      0x00000006
Trap Number:     14


Binary Images:
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    0x7fff69369000 -     0x7fff69391ff7  libsystem_kernel.dylib (4903.278.28) <5B6BB78A-7845-3A31-B87E-03E18DDE4D86> /usr/lib/system/libsystem_kernel.dylib
    0x7fff69392000 -     0x7fff693ddff7  libsystem_m.dylib (3158.200.7) <F19B6DB7-014F-3820-831F-389CCDA06EF6> /usr/lib/system/libsystem_m.dylib
    0x7fff693de000 -     0x7fff69408fff  libsystem_malloc.dylib (166.270.1) <011F3AD0-8E6A-3A89-AE64-6E5F6840F30A> /usr/lib/system/libsystem_malloc.dylib
    0x7fff69409000 -     0x7fff69413ff7  libsystem_networkextension.dylib (767.250.2) <FF06F13A-AEFE-3A27-A073-910EF78AEA36> /usr/lib/system/libsystem_networkextension.dylib
    0x7fff69414000 -     0x7fff6941bfff  libsystem_notify.dylib (172.200.21) <145B5CFC-CF73-33CE-BD3D-E8DDE268FFDE> /usr/lib/system/libsystem_notify.dylib
    0x7fff6941c000 -     0x7fff69425fef  libsystem_platform.dylib (177.270.1) <9D1FE5E4-EB7D-3B3F-A8D1-A96D9CF1348C> /usr/lib/system/libsystem_platform.dylib
    0x7fff69426000 -     0x7fff69430ff7  libsystem_pthread.dylib (330.250.2) <2D5C08FF-484F-3D59-9132-CE1DCB3F76D7> /usr/lib/system/libsystem_pthread.dylib
    0x7fff69431000 -     0x7fff69434ff7  libsystem_sandbox.dylib (851.270.1) <9494594B-5199-3186-82AB-5FF8BED6EE16> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff69435000 -     0x7fff69437ff3  libsystem_secinit.dylib (30.260.2) <EF1EA47B-7B22-35E8-BD9B-F7003DCB96AE> /usr/lib/system/libsystem_secinit.dylib
    0x7fff69438000 -     0x7fff6943fff3  libsystem_symptoms.dylib (820.267.1) <03F1C2DD-0F5A-3D9D-88F6-B26C0F94EB52> /usr/lib/system/libsystem_symptoms.dylib
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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: 194879
    thread_create: 0
    thread_set_state: 75

VM Region Summary:
ReadOnly portion of Libraries: Total=374.5M resident=0K(0%) swapped_out_or_unallocated=374.5M(100%)
Writable regions: Total=61.4M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=61.4M(100%)

                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Activity Tracing                   256K        1 
Kernel Alloc Once                    8K        1 
MALLOC                            38.0M       19 
MALLOC guard page                   16K        3 
MALLOC_LARGE (reserved)            304K        2         reserved VM address space (unallocated)
STACK GUARD                       56.0M        1 
Stack                             8192K        1 
VM_ALLOCATE                       9984K       22 
__DATA                            28.2M      262 
__FONT_DATA                          4K        1 
__LINKEDIT                       223.4M       37 
__TEXT                           151.1M      257 
__UNICODE                          564K        1 
shared memory                       12K        3 
===========                     =======  ======= 
TOTAL                            515.5M      611 
TOTAL, minus reserved VM space   515.2M      611

Maybe the best solution would be to fix Homebrew Cask to remove the symlink. It shouldn't be necessary because the kitty binary should already in PATH when using kitty.

[kovidgoyal]

That will be because the kitty launcher is linked against the Python framework and ld is resolving the Python framework from /usr/local/Cellar instead of the kitty application bundle. I dont use macOS so I dont recall what the semantics of dyld there are, but most likely there is some environment variable causing this behavior.

[kovidgoyal]

In fact doing otool -L /Applications/kitty.app/Contents/MacOS/kitty shows that python is loaded from @executable_path/../Frameworks/Python.framework which in the case of /usr/local/bin/kitty would be /usr/local/Frameworks/Python.framework. I doubt there is such a framework, which definitely indicates there is some fallback framework finding going on, check the dylid man page for details.

[midchildan]

Actually, it looks like Homebrew does place symlinks in /usr/local/Frameworks/Python.framework if you have the python formula installed.

$ ls /usr/local/Frameworks/Python.framework
Headers@   Python@    Resources@ Versions/

[kovidgoyal]

Well then you are basically hosed. You cant both have python from homebrew and kitty in /usr/local/bin. Just put your kitty symlink in some other directory that is on your path. Or if you only ever run kitty from inside kitty, you dont need a symlink at all.

[midchildan]

I agree there isn't much valid use case for putting a symlink in /usr/local/bin, but that's what Homebrew Cask currently does upon installation. I've created a PR in Homebrew Cask to remove the symlink, so hopefully this will be resolved.

[kovidgoyal]

A symlink in /usr/local/bin is useful if you use kitty remote control from outside of kitty. But if homebrew is going to do that it should create a simple launcher there instead of a symlink.

[midchildan]

Homebrew Cask now places a launcher script instead of a symlink. However, the fix won't be applied to existing installations until users upgrade to the next release or manually reinstall with brew cask reinstall kitty. I did a manual reinstall and confirmed the problem went away.