Crash in ~FzColorspace()

[qu1ck]

Description of the bug

Not sure if this should be reported in mupdf repo instead, please let me know.

How to reproduce the bug

The trigger for this crash is somewhat convoluted. KiCad EDA package uses python scripting for it's plugins and this was discovered when one plugin is launched while another plugin that uses pymupdf is present in the installation.
Original bug report is here: openscopeproject/InteractiveHtmlBom#467

After looking at the crash it's apparent that none of the plugins have anything to do with the crash, it happens when python garbage collects some objects and in particular FzColorSpace causes the crash.

Full crash log

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process:               kicad [1099]
Path:                  /Applications/KiCad/KiCad.app/Contents/MacOS/kicad
Identifier:            org.kicad.kicad
Version:               8.0.5 (8.0.5)
Code Type:             X86-64 (Native)
Parent Process:        launchd [1]
User ID:               501

Date/Time:             2024-09-17 02:59:30.5148 -0700
OS Version:            macOS 12.6.5 (21G531)
Report Version:        12
Anonymous UUID:        3E9CA79D-3423-4873-976A-2EA9582F85BB


Time Awake Since Boot: 890 seconds

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 0x0000000000000030
Exception Codes:       0x0000000000000001, 0x0000000000000030
Exception Note:        EXC_CORPSE_NOTIFY

Termination Reason:    Namespace SIGNAL, Code 11 Segmentation fault: 11
Terminating Process:   exc handler [1099]

VM Region Info: 0x30 is not in any region.  Bytes before following region: 140737487368144
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      VM_ALLOCATE              7ffffff0f000-7ffffff10000 [    4K] r-x/r-x SM=ALI  

Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   libmupdf.dylib                	       0x120629430 fz_drop_icc_profile + 16
1   libmupdf.dylib                	       0x12062bf58 fz_drop_colorspace_imp + 136
2   libmupdfcpp.so                	       0x11e6dcdad mupdf::ll_fz_drop_colorspace(fz_colorspace*) + 61
3   libmupdfcpp.so                	       0x11e69d3bc mupdf::FzColorspace::~FzColorspace() + 12
4   _mupdf.so                     	       0x1221183a6 _wrap_delete_FzColorspace(_object*, _object*) + 70
5   _mupdf.so                     	       0x122359c0d SwigPyObject_dealloc(_object*) + 205
6   Python                        	       0x103bc610e dict_dealloc + 142
7   Python                        	       0x103be7d72 subtype_dealloc + 1106
8   Python                        	       0x103bc610e dict_dealloc + 142
9   Python                        	       0x103be7d72 subtype_dealloc + 1106
10  Python                        	       0x103bc37d1 PyDict_Clear + 465
11  Python                        	       0x103bc67e9 dict_tp_clear + 9
12  Python                        	       0x103ce2e8d collect + 3245
13  Python                        	       0x103ce21c8 _PyGC_CollectNoFail + 72
14  Python                        	       0x103ca5aeb _PyImport_Cleanup + 3483
15  Python                        	       0x103cbca40 Py_FinalizeEx + 160
16  kicad                         	       0x100614ad0 pybind11::finalize_interpreter() + 704
17  kicad                         	       0x1006146fd SCRIPTING::~SCRIPTING() + 29
18  kicad                         	       0x10047da3f PGM_BASE::~PGM_BASE() + 335
19  libsystem_c.dylib             	    0x7ff808d44de4 __cxa_finalize_ranges + 409
20  libsystem_c.dylib             	    0x7ff808d44bfe exit + 35
21  libdyld.dylib                 	    0x7ff808e58375 dyld4::LibSystemHelpers::exit(int) const + 11
22  dyld                          	       0x10246e558 start + 504

Thread 1:
0   libsystem_pthread.dylib       	    0x7ff808e47f48 start_wqthread + 0

Thread 2:: com.apple.NSEventThread
0   libsystem_kernel.dylib        	    0x7ff808e0f96a mach_msg_trap + 10
1   libsystem_kernel.dylib        	    0x7ff808e0fcd8 mach_msg + 56
2   CoreFoundation                	    0x7ff808f16510 __CFRunLoopServiceMachPort + 319
3   CoreFoundation                	    0x7ff808f14ba0 __CFRunLoopRun + 1276
4   CoreFoundation                	    0x7ff808f13fe4 CFRunLoopRunSpecific + 562
5   AppKit                        	    0x7ff80b9f298e _NSEventThread + 132
6   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
7   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 3:: com.apple.CFSocket.private
0   libsystem_kernel.dylib        	    0x7ff808e17d4a __select + 10
1   CoreFoundation                	    0x7ff808f3d2bb __CFSocketManager + 643
2   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
3   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 4:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 5:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 6:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 7:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 8:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 9:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 10:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 11:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   kicad                         	       0x1005b0a0e BS::thread_pool::worker() + 174
4   kicad                         	       0x1005b0df3 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 12:
0   libsystem_pthread.dylib       	    0x7ff808e47f48 start_wqthread + 0

Thread 13:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 14:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 15:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 16:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 17:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 18:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 19:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15

Thread 20:
0   libsystem_kernel.dylib        	    0x7ff808e123da __psynch_cvwait + 10
1   libsystem_pthread.dylib       	    0x7ff808e4ca6f _pthread_cond_wait + 1249
2   libc++.1.dylib                	    0x7ff808daad22 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   _pcbnew.kiface                	       0x1157f7b3e BS::thread_pool::worker() + 174
4   _pcbnew.kiface                	       0x1157f7f23 void* std::__1::__thread_proxy[abi:v15006]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (BS::thread_pool::*)(), BS::thread_pool*> >(void*) + 67
5   libsystem_pthread.dylib       	    0x7ff808e4c4e1 _pthread_start + 125
6   libsystem_pthread.dylib       	    0x7ff808e47f6b thread_start + 15


Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x00007fd4117451c0  rcx: 0x00007fd415236118  rdx: 0x0000000000000000
  rdi: 0x00007fd415236000  rsi: 0x00007fd41c108200  rbp: 0x00007ff7bfc52430  rsp: 0x00007ff7bfc52430
   r8: 0x0000000000000000   r9: 0x00007fd41931f000  r10: 0x00007ff808e12332  r11: 0x0000000000000246
  r12: 0x0000000122749280  r13: 0x0000600001068840  r14: 0x00007fd415236000  r15: 0x000000011eeff680
  rip: 0x0000000120629430  rfl: 0x0000000000010206  cr2: 0x0000000000000030
  
Logical CPU:     2
Error Code:      0x00000004 (no mapping for user data read)
Trap Number:     14

Thread 0 instruction stream:
  c4 08 5b 5d c3 48 8d 15-dc 1c 80 00 48 89 df be  ..[].H......H...
  07 00 00 00 31 c0 e8 a5-3e 06 00 0f 1f 44 00 00  ....1...>....D..
  48 85 f6 74 23 55 48 89-e5 48 8b 87 98 bb 00 00  H..t#UH..H......
  48 8b 78 30 e8 47 7e 3d-00 89 c1 31 c0 81 f9 20  H.x0.G~=...1... 
  62 61 4c 0f 94 c0 5d c3-31 c0 c3 0f 1f 44 00 00  baL...].1....D..
  48 85 f6 74 15 55 48 89-e5 48 8b 87 98 bb 00 00  H..t.UH..H......
 [48]8b 78 30 5d e9 76 81-3d 00 c3 0f 1f 44 00 00  H.x0].v.=....D..	<==
  55 48 89 e5 41 57 41 56-53 50 48 89 cb 49 89 d6  UH..AWAVSPH..I..
  48 8b 87 98 bb 00 00 4c-8b 78 30 4c 89 ff ba 63  H......L.x0L...c
  73 65 64 e8 18 8f 3d 00-41 c6 06 00 48 8d 15 62  sed...=.A...H..b
  1c 80 00 48 8d 0d 5e 1c-80 00 4c 89 ff 48 89 c6  ...H..^...L..H..
  4d 89 f0 41 89 d9 48 83-c4 08 5b 41 5e 41 5f 5d  M..A..H...[A^A_]

Binary Images:
       0x12061a000 -        0x121e11fff libmupdf.dylib (*) <c3696177-d2b0-31b9-881c-bd63aa1f43cd> /Users/USER/Library/Python/3.9/lib/python/site-packages/pymupdf/libmupdf.dylib
       0x11e699000 -        0x11e728fff libmupdfcpp.so (*) <7ca1e3ac-9f95-3b52-b9e0-3ed2b98fdea6> /Users/USER/Library/Python/3.9/lib/python/site-packages/pymupdf/libmupdfcpp.so
       0x121f2a000 -        0x1226d9fff _mupdf.so (*) <f616c00e-b555-3e60-a173-9b729531addb> /Users/USER/Library/Python/3.9/lib/python/site-packages/pymupdf/_mupdf.so
       0x103b43000 -        0x103dcefff org.python.python (3.9.13, (c) 2001-2021 Python Software Foundation.) <51a5f278-64ca-3248-865a-b0b5c96814fb> /Applications/KiCad/KiCad.app/Contents/Frameworks/Python.framework/Versions/3.9/Python
       0x1002ad000 -        0x1006e0fff org.kicad.kicad (8.0.5) <24e4b54c-a30e-3254-bd9d-1e6ffbce0a50> /Applications/KiCad/KiCad.app/Contents/MacOS/kicad
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VM Region Summary:
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-----------
Full Report
-----------

{"app_name":"kicad","timestamp":"2024-09-17 02:59:40.00 -0700","app_version":"8.0.5","slice_uuid":"24e4b54c-a30e-3254-bd9d-1e6ffbce0a50","build_version":"8.0.5","platform":1,"bundleID":"org.kicad.kicad","share_with_app_devs":0,"is_first_party":0,"bug_type":"309","os_version":"macOS 12.6.5 (21G531)","incident_id":"A265BF15-9995-48F1-AF06-748D1C476BBA","name":"kicad"}
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By bisecting the pymupdf version I found that last one that does not crash is 1.23.8.
Crash reproduces reliably.

PyMuPDF version

1.24.10

Operating system

MacOS

Python version

3.9

[julian-smith-artifex-com]

Thanks for the detailed report.

We have a theory about what's going on, i'll update this ticket in the next few days hopefully.

[julian-smith-artifex-com]

Unfortunately my theory didn't work.

One thing to point out, is that the crash log has many threads, but PyMuPDF does not support use by multiple threads. Is this likely to be a problem here?

[qu1ck]

There are many threads because it's a gui cpp application, but only the main thread is running python interpreter so that should not be an issue.

[julian-smith-artifex-com]

I've just had another look at this and noticed that the main thread looks like it is using pybind11 to give a Python binding to MuPDF's C++ API. I think this could be the problem.

PyMuPDF uses a SWIG-generated Python binding onto MuPDF's C++ bindings. I would not expect these two bindings to coexist safely, there are simply too many ways things could go wrong, for example potentially having different versions of MuPDF in the same process, or one MuPDF with two Python bindings that may have been built for different MuPDF versions.

The underlying SWIG-generated MuPDF Python binding can be built independently of PyMuPDF - see https://mupdf.readthedocs.io/en/latest/language-bindings.html. It might be better to use this instead of pybind11.

However if you also want to use PyMuPDF, you'll need to use pymupdf.mupdf, which is PyMuPDF's build of the MuPDF SWIG-generated Python bindings. Attempting to use PyMuPDF at the same time as either your own build of the MuPDF Python bindings or pybind11's MuPDF Python bindings, will almost certainly not work.

[qu1ck]

KiCad uses Pybind11 to use python from c++, not the other way around. It does not interact with mupdf at all, at least not directly.
There are no 2 different bindings for mypdf in play here.

Your theory also does not explain why 1.23.8 works fine and later versions reliably crash.

[julian-smith-artifex-com]

Thanks, i was a little confused.

However from the backtrace it looks like pybind11 is running the Python interpreter - pybind11::finalize_interpreter() is calling Py_FinalizeEx(). This is quite a significant difference compared to normal operation, so it's maybe not too surprising that things are going wrong.

Are you running Python from C++ as described in https://pybind11.readthedocs.io/en/stable/advanced/embedding.html? I.e. something like:

    py::scoped_interpreter guard{};

    py::exec(R"(
        kwargs = dict(name="World", number=42)
        message = "Hello, {name}! The answer is {number}".format(**kwargs)
        print(message)
    )");

If so, there are a couple of things we could try:

• I'll look into testing PyMuPDF when run inside a C++ via pybind.
• You test your pluging system with just import pymupdf using a debug build of PyMuPDF with diagnostics enabled such as MUPDF_trace=2 and MUPDF_trace_keepdrop=1 (see https://mupdf.readthedocs.io/en/latest/language-bindings.html#debug-builds-only). This might give us more information about what is going on a shutdown.

[One other thing, PyMuPDF-1.23.8 was the last release before we changed to the new "rebased" implementation; see #2680. One of the minor changes is more systematic handling of destruction of MuPDF types.]

[qu1ck]

A bit lower in your link there is an alternative way to manually handle interpreter lifetime with pybind11:
https://pybind11.readthedocs.io/en/stable/advanced/embedding.html#interpreter-lifetime

And that's exactly how it's used in kicad:
https://gitlab.com/kicad/code/kicad/-/blob/master/scripting/python_scripting.cpp#L64

You test your pluging system with just import pymupdf using a debug build of PyMuPDF with diagnostics enabled such as MUPDF_trace=2 and MUPDF_trace_keepdrop=1

Sadly I don't have access to a mac anymore and my VM crapped out so it may be a while until I can get back to you on this.

[qu1ck]

One of kicad devs tried the debug build and this is the output they got

On startup/import:

platform/c++/implementation/internal.cpp:71:reinit():  calling fz_drop_context()
platform/c++/implementation/internal.cpp:78:reinit():  calling fz_new_context()
platform/c++/implementation/internal.cpp:84:reinit():  calling fz_register_document_handlers()
platform/c++/implementation/internal.cpp:71:reinit():  calling fz_drop_context()
platform/c++/implementation/internal.cpp:78:reinit():  calling fz_new_context()
platform/c++/implementation/internal.cpp:84:reinit():  calling fz_register_document_handlers()
platform/c++/implementation/functions.cpp:6896:ll_fz_device_rgb(): calling fz_device_rgb(): auto_ctx=0x110198000
platform/c++/implementation/functions.cpp:16452:ll_fz_keep_colorspace(): calling fz_keep_colorspace(): auto_ctx=0x110198000 colorspace=0x131d408d0
platform/c++/implementation/functions.cpp:6814:ll_fz_device_gray(): calling fz_device_gray(): auto_ctx=0x110198000
platform/c++/implementation/functions.cpp:16452:ll_fz_keep_colorspace(): calling fz_keep_colorspace(): auto_ctx=0x110198000 colorspace=0x131d6ff60
platform/c++/implementation/functions.cpp:6731:ll_fz_device_cmyk(): calling fz_device_cmyk(): auto_ctx=0x110198000
platform/c++/implementation/functions.cpp:16452:ll_fz_keep_colorspace(): calling fz_keep_colorspace(): auto_ctx=0x110198000 colorspace=0x131d41aa0
platform/c++/implementation/functions.cpp:39598:ll_fz_set_warning_callback(): calling fz_set_warning_callback(): auto_ctx=0x110198000 warning_cb=0x168a15080 user=0x600003f7df10
platform/c++/implementation/functions.cpp:38939:ll_fz_set_error_callback(): calling fz_set_error_callback(): auto_ctx=0x110198000 error_cb=0x168a15080 user=0x600003cfe610
platform/c++/implementation/classes2.cpp:4998:fz_is_infinite_rect(): calling mupdf::ll_fz_is_infinite_rect()
platform/c++/implementation/functions.cpp:15816:ll_fz_is_infinite_rect(): calling fz_is_infinite_rect(): r=(x0=-2.14748e+09 y0=-2.14748e+09 x1=2.14748e+09 y1=2.14748e+09)
platform/c++/implementation/classes.cpp:32410:PdfDocument(): calling mupdf::ll_pdf_create_document()
platform/c++/implementation/functions.cpp:55031:ll_pdf_create_document(): calling pdf_create_document(): auto_ctx=0x110198000
platform/c++/implementation/functions.cpp:16662:ll_fz_keep_document(): calling fz_keep_document(): auto_ctx=0x110198000 doc=0x138088000
platform/c++/implementation/classes2.cpp:4858:fz_is_document_reflowable(): calling mupdf::ll_fz_is_document_reflowable()
platform/c++/implementation/functions.cpp:15552:ll_fz_is_document_reflowable(): calling fz_is_document_reflowable(): auto_ctx=0x110198000 doc=0x138088000
platform/c++/implementation/classes2.cpp:6454:fz_needs_password(): calling mupdf::ll_fz_needs_password()
platform/c++/implementation/functions.cpp:20668:ll_fz_needs_password(): calling fz_needs_password(): auto_ctx=0x110198000 doc=0x138088000
platform/c++/implementation/classes.cpp:14376:FzOutline(): calling mupdf::ll_fz_new_outline()
platform/c++/implementation/functions.cpp:24954:ll_fz_new_outline(): calling fz_new_outline(): auto_ctx=0x110198000
platform/c++/implementation/classes2.cpp:5482:fz_load_outline(): calling mupdf::ll_fz_load_outline()
platform/c++/implementation/functions.cpp:18474:ll_fz_load_outline(): calling fz_load_outline(): auto_ctx=0x110198000 doc=0x138088000
platform/c++/implementation/classes.cpp:14419:operator=(): calling ll_fz_drop_outline(this->m_internal) and ll_fz_keep_outline(rhs.m_internal)
platform/c++/implementation/functions.cpp:9507:ll_fz_drop_outline(): calling fz_drop_outline(): auto_ctx=0x110198000 outline=0x600000d31640
platform/c++/implementation/functions.cpp:17351:ll_fz_keep_outline(): calling fz_keep_outline(): auto_ctx=0x110198000 outline=0x0
platform/c++/implementation/functions.cpp:9507:ll_fz_drop_outline(): calling fz_drop_outline(): auto_ctx=0x110198000 outline=0x0
platform/c++/implementation/functions.cpp:17351:ll_fz_keep_outline(): calling fz_keep_outline(): auto_ctx=0x110198000 outline=0x0
platform/c++/implementation/classes.cpp:14398:FzOutline(): have called ll_fz_keep_outline(rhs.m_internal)
platform/c++/implementation/functions.cpp:9507:ll_fz_drop_outline(): calling fz_drop_outline(): auto_ctx=0x110198000 outline=0x0
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='format'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:Title'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:Author'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:Subject'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:Keywords'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:Creator'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:Producer'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:CreationDate'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:ModDate'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='info:Trapped'
platform/c++/implementation/classes2.cpp:5799:fz_lookup_metadata2(): calling mupdf::ll_fz_lookup_metadata2()
platform/c++/implementation/functions.cpp:19325:ll_fz_lookup_metadata2(): calling fz_lookup_metadata2(): auto_ctx=0x110198000 doc=0x138088000 key='encryption'
platform/c++/implementation/functions.cpp:59802:ll_pdf_drop_document(): calling pdf_drop_document(): auto_ctx=0x110198000 doc=0x138088000
platform/c++/implementation/functions.cpp:8690:ll_fz_drop_document(): calling fz_drop_document(): auto_ctx=0x110198000 doc=0x138088000
platform/c++/implementation/functions.cpp:9507:ll_fz_drop_outline(): calling fz_drop_outline(): auto_ctx=0x110198000 outline=0x0

Before the crash:

platform/c++/implementation/internal.cpp:105:~internal_state():  calling fz_drop_context()
platform/c++/implementation/classes2.cpp:3562:fz_flush_warnings(): calling mupdf::ll_fz_flush_warnings()
platform/c++/implementation/internal.cpp:213:internal_context_get(): MuPDF C++ internal assert failure: s_state_valid
Signal: SIGABRT (signal SIGABRT)

[julian-smith-artifex-com]

Thanks for the debug output.

Some background: PyMuPDF sets up an atexit handler to avoid a problem when fz_drop_context() is called on termination - it attempts to send pending warning messages to Python, and this fails because the necessary state to call Python from C/C++ has been torn down. The atexit handler is called before fz_drop_context() and cancels PyMuPDF's warning callback, so later on fz_drop_context() runs without crashing.

See: https://github.com/pymupdf/PyMuPDF/blob/main/src/__init__.py#L21957

The above debug output seems to imply that:

1. PyMuPDF's atexit handler is not being called.
2. fz_drop_context() crashes.

So it looks like there's something else going on that is somehow preventing PyMuPDF's atexit handler from being called.

Separately from all that, i've managed to run some simple Python code via pybind, and it runs fine. Debug diagostics show PyMuPDF's atexit handler is being called as it should. My C++ code is:

#include <pybind11/embed.h>

int main()
{
    pybind11::scoped_interpreter guard{};
    pybind11::exec(R"(
            print('Hello world', flush=1)
            import pymupdf
            pymupdf.JM_mupdf_show_warnings = 1
            print(f'{pymupdf.version=}', flush=1)
            doc = pymupdf.Document()
            pymupdf.mupdf.fz_warn('Dummy warning.')
            pymupdf.mupdf.fz_warn('Dummy warning.')
            pymupdf.mupdf.fz_warn('Dummy warning.')
            print(f'{doc=}', flush=1)
            )");
}

For completeness, the end of the debug diagnostics is:

platform/c++/implementation/functions.cpp:43144:ll_fz_warn(): calling fz_warn(): auto_ctx=0x55b85371c850 fmt='Dummy warning.'
MuPDF warning: Dummy warning.
platform/c++/implementation/functions.cpp:43144:ll_fz_warn(): calling fz_warn(): auto_ctx=0x55b85371c850 fmt='Dummy warning.'
platform/c++/implementation/functions.cpp:43144:ll_fz_warn(): calling fz_warn(): auto_ctx=0x55b85371c850 fmt='Dummy warning.'
doc=Document(<new PDF, doc# 1>)
platform/c++/implementation/classes2.cpp:3562:fz_flush_warnings(): calling mupdf::ll_fz_flush_warnings()
platform/c++/implementation/functions.cpp:11972:ll_fz_flush_warnings(): calling fz_flush_warnings(): auto_ctx=0x55b85371c850
MuPDF warning: ... repeated 3 times...
platform/c++/implementation/functions.cpp:39598:ll_fz_set_warning_callback(): calling fz_set_warning_callback(): auto_ctx=0x55b85371c850 warning_cb=0 user=0
platform/c++/implementation/functions.cpp:38939:ll_fz_set_error_callback(): calling fz_set_error_callback(): auto_ctx=0x55b85371c850 error_cb=0 user=0
platform/c++/implementation/functions.cpp:8690:ll_fz_drop_document(): calling fz_drop_document(): auto_ctx=0x55b85371c850 doc=0x55b853b08f00
platform/c++/implementation/functions.cpp:9507:ll_fz_drop_outline(): calling fz_drop_outline(): auto_ctx=0x55b85371c850 outline=0
platform/c++/implementation/functions.cpp:8411:ll_fz_drop_colorspace(): calling fz_drop_colorspace(): auto_ctx=0x55b85371c850 colorspace=0x55b85353d780
platform/c++/implementation/functions.cpp:8411:ll_fz_drop_colorspace(): calling fz_drop_colorspace(): auto_ctx=0x55b85371c850 colorspace=0x55b853517e80
platform/c++/implementation/functions.cpp:8411:ll_fz_drop_colorspace(): calling fz_drop_colorspace(): auto_ctx=0x55b85371c850 colorspace=0x55b8534c7a80
platform/c++/implementation/internal.cpp:105:~internal_state():  calling fz_drop_context()

[julian-smith-artifex-com]

Closing this because no response for a long time. PyMuPDF is being run in a very different way from usual, and it looks like the atexit() handler is not being called.