iOS Question App crashed due to CPU over usage

[AneeshJay]

Hi All,
I have this weird issue where the app keeps crashing randomly. I had the client email me the device logs(https://www.b4x.com/android/forum/threads/tip-on-device-logs.156056/#content). Below is one from the logs. From the below crash log, and from doing some research online, I learned that the app is being killed by the OS for extensive CPU usage and that I could find the runaway code by symbolicating the crash report.

{"roots_installed":0,"app_name":"Ai-POSX","timestamp":"2024-12-12 10:20:06.00 +1000","app_version":"4.22","slice_uuid":"3C64164C-5334-35B7-92EB-1BF3D1BF4AC6","adam_id":"6469747360","build_version":"4.22","bundleID":"b4i.AiPOSX","duration_ms":"179193","is_first_party":0,"share_with_app_devs":0,"bug_type":"202","os_version":"iPhone OS 18.1.1 (22B91)","distributor_id":"com.apple.AppStore","name":"Ai-POSX","incident_id":"44308A0D-A500-4236-A695-40F597A235DE"}
Date/Time:        2024-12-12 10:17:05.298 +1000
End time:         2024-12-12 10:20:04.492 +1000
OS Version:       iPhone OS 18.1.1 (Build 22B91)
Architecture:     arm64e
Report Version:   53
Incident Identifier: 44308A0D-A500-4236-A695-40F597A235DE

Data Source:      Microstackshots
Shared Cache:     5341F4EE-8AA5-3EE6-A94B-D088748566C5 slid base address 0x18faa0000, slide 0xfaa0000

Command:          Ai-POSX
Path:             /private/var/containers/Bundle/Application/C5A077D2-4843-45BA-8434-15CF5047F002/Ai-POSX.app/Ai-POSX
Identifier:       b4i.AiPOSX
Version:          4.22 (4.22)
Adam ID:          6469747360
Is First Party:   No
Beta Identifier:  B6678C13-709E-4D2A-9AAE-3CBF70C91FE4
Resource Coalition: "b4i.AiPOSX"(2052)
Architecture:     arm64
Parent:           UNKNOWN [1]
PID:              3566

Event:            cpu usage
Action taken:     none
CPU:              90 seconds cpu time over 179 seconds (50% cpu average), exceeding limit of 50% cpu over 180 seconds
CPU limit:        90s
Limit duration:   180s
CPU used:         90s
CPU duration:     179s
Duration:         179.19s
Duration Sampled: 178.35s (event ends 0.70s after samples)
Steps:            157

Hardware model:   iPad13,16
Active cpus:      8
HW page size:     16384
VM page size:     16384

Time Since Boot:  748557s
Time Awake Since Boot: 680130s
Time Since Wake:  5325s

Total CPU Time:   94.089s
Advisory levels:  Battery -> 2, User -> 3, ThermalPressure -> 0, Combined -> 2
Free disk space:  30.67 GB/59.59 GB, low space threshold 150 MB
Vnodes Available: 58.10% (11621/20000, 10000 allocated, 10000 soft limit)

Preferred User Language: en-AU
Country Code:     AU
Keyboards:        en_AU QWERTY, emoji Emoji
OS Cryptex File Extents: 1

Heaviest stack for the target process:
  144  ??? (dyld + 212680) [0x1b82a2ec8]
  144  ??? (Ai-POSX + 32868) [0x1023fc064]
  144  ??? (UIKitCore + 4724148) [0x1954c95b4]
  144  ??? (UIKitCore + 4009648) [0x19541aeb0]
  144  ??? (GraphicsServices + 4548) [0x1de8941c4]
  144  ??? (CoreFoundation + 337968) [0x1928b4830]
  140  ??? (CoreFoundation + 341056) [0x1928b5440]
  140  ??? (CoreFoundation + 352772) [0x1928b8204]
  140  ??? (libdispatch.dylib + 75260) [0x19a5c85fc]
  140  ??? (libdispatch.dylib + 76020) [0x19a5c88f4]
  140  ??? (libdispatch.dylib + 106756) [0x19a5d0104]
  140  ??? (libdispatch.dylib + 111932) [0x19a5d153c]
  140  ??? (libdispatch.dylib + 30080) [0x19a5bd580]
  140  ??? (libdispatch.dylib + 16592) [0x19a5ba0d0]
  140  ??? (Ai-POSX + 6360552) [0x102a04de8]
  78  ??? (Ai-POSX + 1107704) [0x1025026f8]
  78  ??? (Ai-POSX + 7069084) [0x102ab1d9c]
  78  ??? (Ai-POSX + 6520772) [0x102a2bfc4]
  78  ??? (Ai-POSX + 6522956) [0x102a2c84c]
  76  ??? (UIKitCore + 695192) [0x1950f1b98]
  76  ??? (CoreGraphics + 253448) [0x1948dee08]
  74  ??? (CoreGraphics + 255132) [0x1948df49c]
  74  ??? (CoreGraphics + 198936) [0x1948d1918]
  74  ??? (CoreGraphics + 371692) [0x1948fbbec]
  74  ??? (CoreGraphics + 382716) [0x1948fe6fc]
  55  ??? (libsystem_platform.dylib + 8396) [0x21ab250cc]


Powerstats for:   Ai-POSX [3566]
UUID:             3C64164C-5334-35B7-92EB-1BF3D1BF4AC6
Path:             /private/var/containers/Bundle/Application/C5A077D2-4843-45BA-8434-15CF5047F002/Ai-POSX.app/Ai-POSX
Identifier:       b4i.AiPOSX
Version:          4.22 (4.22)
Adam ID:          6469747360
Is First Party:   No
Beta Identifier:  B6678C13-709E-4D2A-9AAE-3CBF70C91FE4
Resource Coalition: 157 samples "b4i.AiPOSX"(2052)
Architecture:     arm64
Parent:           UNKNOWN [1]
UID:              501
Footprint:        207.75 MB
Start time:       2024-12-12 10:17:05.438 +1000
End time:         2024-12-12 10:20:03.791 +1000
Num samples:      157 (100%)
Num threads:      8
Primary state:    90 samples Frontmost App, Non-Suppressed, User mode, Effective Thread QoS User Interactive, Requested Thread QoS User Interactive, Override Thread QoS Unspecified, p-core
User Activity:    0 samples Idle, 157 samples Active
Power Source:     157 samples on Battery, 0 samples on AC
  144  ??? (dyld + 212680) [0x1b82a2ec8]
    144  ??? (Ai-POSX + 32868) [0x1023fc064]
      144  ??? (UIKitCore + 4724148) [0x1954c95b4]
        144  ??? (UIKitCore + 4009648) [0x19541aeb0]
          144  ??? (GraphicsServices + 4548) [0x1de8941c4]
            144  ??? (CoreFoundation + 337968) [0x1928b4830]
              140  ??? (CoreFoundation + 341056) [0x1928b5440]
                140  ??? (CoreFoundation + 352772) [0x1928b8204]
                  140  ??? (libdispatch.dylib + 75260) [0x19a5c85fc]
                    140  ??? (libdispatch.dylib + 76020) [0x19a5c88f4]
                      140  ??? (libdispatch.dylib + 106756) [0x19a5d0104]
                        140  ??? (libdispatch.dylib + 111932) [0x19a5d153c]
                          140  ??? (libdispatch.dylib + 30080) [0x19a5bd580]
                            140  ??? (libdispatch.dylib + 16592) [0x19a5ba0d0]
                              140  ??? (Ai-POSX + 6360552) [0x102a04de8]
                                78   ??? (Ai-POSX + 1107704) [0x1025026f8]
                                  78   ??? (Ai-POSX + 7069084) [0x102ab1d9c]
                                    78   ??? (Ai-POSX + 6520772) [0x102a2bfc4]
                                      78   ??? (Ai-POSX + 6522956) [0x102a2c84c]
                                        76   ??? (UIKitCore + 695192) [0x1950f1b98]
                                          76   ??? (CoreGraphics + 253448) [0x1948dee08]
                                            74   ??? (CoreGraphics + 255132) [0x1948df49c]
                                              74   ??? (CoreGraphics + 198936) [0x1948d1918]
                                                74   ??? (CoreGraphics + 371692) [0x1948fbbec]
                                                  74   ??? (CoreGraphics + 382716) [0x1948fe6fc]
                                                    55   ??? (libsystem_platform.dylib + 8396) [0x21ab250cc]
                                                      35   <Kernel mode>
                                                    10   ??? (libsystem_platform.dylib + 8364) [0x21ab250ac]
                                                      10   <Kernel mode>
                                                    6    ??? (libsystem_platform.dylib + 8420) [0x21ab250e4]
                                                      4    <Kernel mode>
                                                    2    ??? (libsystem_platform.dylib + 8416) [0x21ab250e0]
                                                    1    ??? (libsystem_platform.dylib + 8184) [0x21ab24ff8]
                                            2    ??? (CoreGraphics + 255000) [0x1948df418]
                                              1    ??? (CoreGraphics + 255388) [0x1948df59c]
                                                1    ??? (CoreGraphics + 80448) [0x1948b4a40]
                                                  1    ??? (CoreGraphics + 80692) [0x1948b4b34]
                                                   ......more

  Binary Images:
           0x1023f4000 -        0x102dcffff  b4i.AiPOSX 4.22 (4.22)   <3C64164C-5334-35B7-92EB-1BF3D1BF4AC6>  /private/var/containers/Bundle/Application/C5A077D2-4843-45BA-8434-15CF5047F002/Ai-POSX.app/Ai-POSX
           0x18fba0000 -        0x18fbf0d5f  libobjc.A.dylib          <1608892E-67DB-3F94-9FC2-91492B86C95F>  /usr/lib/libobjc.A.dylib
           0x1914a5000 -        0x1921b2fff  Foundation               <6D0212CC-3B9E-32C9-BE20-72989CE3ACB8>  /System/Library/Frameworks/Foundation.framework/Foundation
           0x192862000 -        0x192da4fff  CoreFoundation           <1532D3D8-9B3B-3F2F-B35F-55A20DDF411B>  /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
           0x194313000 -        0x1946b8fff  QuartzCore               <D8E8E86D-85AC-3C90-B2E1-940235ECAA18>  /System/Library/Frameworks/QuartzCore.framework/QuartzCore
           0x1948a1000 -        0x194f92fff  CoreGraphics             <519DCABF-190B-3A02-B4A1-F90A0D16FE4C>  /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics
           0x195048000 -        0x196f1bfff  UIKitCore                <575E5140-FA6A-37C2-B00B-A4EACEDFDA53>  /System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
           0x19a5b6000 -        0x19a5fbfff  libdispatch.dylib        <7DE7EC03-CFB7-349D-9B9E-8782B38F231D>  /usr/lib/system/libdispatch.dylib
           0x1a2b0b000 -        0x1a2b46ff7  libsystem_malloc.dylib   <5DBA2C01-92CA-3D1D-A27E-B4E14CFFB2F0>  /usr/lib/system/libsystem_malloc.dylib
           0x1b826f000 -        0x1b82f299f  dyld                     <3060D36A-16CE-3C3A-9258-3881459F5714>  /usr/lib/dyld
           0x1de893000 -        0x1de89bfff  GraphicsServices         <8425EA11-000E-3E5E-8ABC-BDDF3FF3FA32>  /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
           0x1e2c75000 -        0x1e2caeff3  libsystem_kernel.dylib   <B9618C71-C0CB-31B6-825F-92A4737C890E>  /usr/lib/system/libsystem_kernel.dylib
           0x21ab23000 -        0x21ab2afe3  libsystem_platform.dylib <5079E5E0-3525-3D53-8FF0-3E297A22FC4F>  /usr/lib/system/libsystem_platform.dylib
           0x21ace7000 -        0x21acf3ff3  libsystem_pthread.dylib  <3CA98E38-8EEE-3C26-9862-C5F66AAD93C0>  /usr/lib/system/libsystem_pthread.dylib
           0x2214aa000 -        0x2215eefff  RenderBox                <0837ABA1-A8E8-314F-A37A-46796D9AD06B>  /System/Library/PrivateFrameworks/RenderBox.framework/RenderBox

However, I was un-successful in symbolicating the crash log. So I built-in the KSCrash reporting and got the below 2 crash logs.

Incident Identifier: BCBFBE07-21C1-4B2E-9A10-102D312FB791
CrashReporter Key:   7505507639971381a237a594d721bdc0a44d89cb
Hardware Model:      iPad13,16
Process:         Ai-POSX [2798]
Path:            /private/var/containers/Bundle/Application/77294858-92E8-449E-9E9E-B6D0C0BB02DA/Ai-POSX.app/Ai-POSX
Identifier:      b4i.AiPOSX
Version:         4.39 (4.39)
Code Type:       ARM-64
Parent Process:  ? [1]

Date/Time:       2025-01-14 09:30:06.000 +1000
OS Version:      iPadOS 18.2.1 (22C161)
Report Version:  104

Exception Type:  0 (SIGPIPE)
Exception Codes: 0x00000000 at 0x000000022c9a6fcc
Crashed Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_platform.dylib        0x000000022c9a6fcc 0x22c9a4000 + 12236 (_platform_memset + 140)
1   CoreGraphics                    0x00000001a4008c4c 0x1a3f9e000 + 437324 (CGBlt_fillBytes + 276)
2   CoreGraphics                    0x00000001a3fab7e0 0x1a3f9e000 + 55264 (<redacted> + 9852)
3   CoreGraphics                    0x00000001a4008514 0x1a3f9e000 + 435476 (<redacted> + 1108)
4   CoreGraphics                    0x00000001a3fd1330 0x1a3f9e000 + 209712 (<redacted> + 504)
5   CoreGraphics                    0x00000001a3fcf0d0 0x1a3f9e000 + 200912 (<redacted> + 472)
6   CoreGraphics                    0x00000001a3ff2944 0x1a3f9e000 + 346436 (CGContextDrawPath + 336)
7   UIKitCore                       0x00000001a4823480 0x1a474c000 + 881792 (<redacted> + 160)
8   Ai-POSX                         0x00000001047d6350 0x1040d0000 + 7365456 (-[B4ICanvas DrawPath::::] + 252)
9   Ai-POSX                         0x00000001047d5ac8 0x1040d0000 + 7363272 (-[B4ICanvas DrawRect::::] + 216)
10  Ai-POSX                         0x000000010485b8a0 0x1040d0000 + 7911584 ( + 60)
11  Ai-POSX                         0x0000000104208e44 0x1040d0000 + 1281604 ( + 828)
12  Ai-POSX                         0x00000001047ae8ec 0x1040d0000 + 7203052 (__21-[B4ICommon Sleep:::]_block_invoke + 48)
13  libdispatch.dylib               0x00000001a9cdffa8 0x1a9cdc000 + 16296 (<redacted> + 20)
14  libdispatch.dylib               0x00000001a9ce345c 0x1a9cdc000 + 29788 (<redacted> + 596)
15  libdispatch.dylib               0x00000001a9cf7620 0x1a9cdc000 + 112160 (<redacted> + 420)
16  libdispatch.dylib               0x00000001a9cf61e8 0x1a9cdc000 + 106984 (<redacted> + 836)
17  libdispatch.dylib               0x00000001a9cee948 0x1a9cdc000 + 76104 (<redacted> + 748)
18  libdispatch.dylib               0x00000001a9cee64c 0x1a9cdc000 + 75340 (_dispatch_main_queue_callback_4CF + 44)
19  CoreFoundation                  0x00000001a1fa9bbc 0x1a1f30000 + 498620 (<redacted> + 16)
20  CoreFoundation                  0x00000001a1fa61b0 0x1a1f30000 + 483760 (<redacted> + 1996)
21  CoreFoundation                  0x00000001a1ff8274 0x1a1f30000 + 819828 (CFRunLoopRunSpecific + 588)
22  GraphicsServices                0x00000001ef1414c0 0x1ef140000 + 5312 (GSEventRunModal + 164)
23  UIKitCore                       0x00000001a4b3a77c 0x1a474c000 + 4122492 (<redacted> + 816)
24  UIKitCore                       0x00000001a4760e64 0x1a474c000 + 85604 (UIApplicationMain + 340)
25  Ai-POSX                         0x00000001040d4064 0x1040d0000 + 16484 ( + 100)
26  (null) 0x00000001c81b4de8 0x0 + 7652199912

Thread 1 name:  com.apple.uikit.eventfetch-thread
Thread 1:
0   libsystem_kernel.dylib          0x00000001f355a788 0x1f3559000 + 6024 (mach_msg2_trap + 8)
1   libsystem_kernel.dylib          0x00000001f355de98 0x1f3559000 + 20120 (mach_msg2_internal + 80)
2   libsystem_kernel.dylib          0x00000001f355ddb0 0x1f3559000 + 19888 (mach_msg_overwrite + 424)
3   libsystem_kernel.dylib          0x00000001f355dbfc 0x1f3559000 + 19452 (mach_msg + 24)
4   CoreFoundation                  0x00000001a1fa67f4 0x1a1f30000 + 485364 (<redacted> + 160)
5   CoreFoundation                  0x00000001a1fa5ea0 0x1a1f30000 + 482976 (<redacted> + 1212)
6   CoreFoundation                  0x00000001a1ff8274 0x1a1f30000 + 819828 (CFRunLoopRunSpecific + 588)
7   Foundation                      0x00000001a0b5eb48 0x1a0b35000 + 170824 (<redacted> + 212)
8   Foundation                      0x00000001a0cbb6f4 0x1a0b35000 + 1599220 (<redacted> + 64)
9   UIKitCore                       0x00000001a4bcdb80 0x1a474c000 + 4725632 (<redacted> + 420)
10  Foundation                      0x00000001a0c4aa54 0x1a0b35000 + 1137236 (<redacted> + 724)
11  libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 2:
0   libsystem_kernel.dylib          0x00000001f35602b0 0x1f3559000 + 29360 (__semwait_signal + 8)
1   libsystem_c.dylib               0x00000001a9d3a5cc 0x1a9d22000 + 99788 (nanosleep + 220)
2   Foundation                      0x00000001a13e1238 0x1a0b35000 + 9093688 (<redacted> + 160)
3   Ai-POSX                         0x00000001048191f0 0x1040d0000 + 7639536 (-[B4IUDPSocket readerThread] + 668)
4   Foundation                      0x00000001a0c4aa54 0x1a0b35000 + 1137236 (<redacted> + 724)
5   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 3:
0   libsystem_kernel.dylib          0x00000001f35602b0 0x1f3559000 + 29360 (__semwait_signal + 8)
1   libsystem_c.dylib               0x00000001a9d3a5cc 0x1a9d22000 + 99788 (nanosleep + 220)
2   libsystem_c.dylib               0x00000001a9d3a444 0x1a9d22000 + 99396 (sleep + 52)
3   Ai-POSX                         0x00000001048c1f94 0x1040d0000 + 8331156 ( + 132)
4   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 4 name:  KSCrash Exception Handler (Secondary)
Thread 4:
0   libsystem_kernel.dylib          0x00000001f355a788 0x1f3559000 + 6024 (mach_msg2_trap + 8)
1   libsystem_kernel.dylib          0x00000001f355de98 0x1f3559000 + 20120 (mach_msg2_internal + 80)
2   libsystem_kernel.dylib          0x00000001f355bcfc 0x1f3559000 + 11516 (thread_suspend + 108)
3   Ai-POSX                         0x00000001048be808 0x1040d0000 + 8316936 ( + 152)
4   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 5 name:  KSCrash Exception Handler (Primary)
Thread 5:
0   libsystem_kernel.dylib          0x00000001f355a788 0x1f3559000 + 6024 (mach_msg2_trap + 8)
1   libsystem_kernel.dylib          0x00000001f355de98 0x1f3559000 + 20120 (mach_msg2_internal + 80)
2   libsystem_kernel.dylib          0x00000001f355ddb0 0x1f3559000 + 19888 (mach_msg_overwrite + 424)
3   libsystem_kernel.dylib          0x00000001f355dbfc 0x1f3559000 + 19452 (mach_msg + 24)
4   Ai-POSX                         0x00000001048be840 0x1040d0000 + 8316992 ( + 208)
5   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 6:
0   libsystem_kernel.dylib          0x00000001f355a510 0x1f3559000 + 5392 (__workq_kernreturn + 8)
1   libsystem_pthread.dylib         0x000000022ca536cc 0x22ca50000 + 14028 (_pthread_wqthread + 364)

Thread 7:
0   libsystem_kernel.dylib          0x00000001f355a510 0x1f3559000 + 5392 (__workq_kernreturn + 8)
1   libsystem_pthread.dylib         0x000000022ca536cc 0x22ca50000 + 14028 (_pthread_wqthread + 364)

Thread 8:
0   libsystem_pthread.dylib         0x000000022ca5146c 0x22ca50000 + 5228 (pthread_getspecific + 12)

Thread 9:

Thread 0 crashed with ARM-64 Thread State:
  cpsr: 0x0000000020001000     fp: 0x000000016bd2df10     lr: 0x00000001a4008c4c     pc: 0x000000022c9a6fcc
    sp: 0x000000016bd2dee0     x0: 0x00000001235c3e00     x1: 0x0000000000000000    x10: 0x0000000000000000
   x11: 0x0000000000000000    x12: 0x00000000000000e8    x13: 0x0000000000000001    x14: 0x0000000000000004
   x15: 0x000000000000e200    x16: 0x000000022c9a6ee0    x17: 0x00000001a3fab6bc    x18: 0x0000000000000000
   x19: 0x00000001235c3e00     x2: 0x0000000000000148    x20: 0x0000000000000388    x21: 0x0000000000000067
   x22: 0x00000000000003a0    x23: 0x00000001235a8020    x24: 0x0000000000000000    x25: 0x00000000ffffff00
   x26: 0x00000001253fc720    x27: 0x00000000000000e2    x28: 0x00000001235a8020    x29: 0x000000016bd2df10
    x3: 0x00000001235c4000     x4: 0x00000001235c3e80     x5: 0x0000000000000001     x6: 0x0000000301b53788
    x7: 0x0000000301b53788     x8: 0x0000000000000001     x9: 0x0000000000000001

Binary Images:
       0x1040d0000 -        0x1049dbfff +Ai-POSX arm64  <cb8faa9fb4de3c6a958cdfc7674935ad> /private/var/containers/Bundle/Application/77294858-92E8-449E-9E9E-B6D0C0BB02DA/Ai-POSX.app/Ai-POSX
       0x105fa8000 -        0x105fb3fff  libobjc-trampolines.dylib arm64  <be05652226b13a508ad193ac99fcdc9c> /private/preboot/Cryptexes/OS/usr/lib/libobjc-trampolines.dylib
       0x19f4a8000 -        0x19f4f8ccf  libobjc.A.dylib arm64  <3ed8b852087d3b6ea36fceafed8e93ae> /usr/lib/libobjc.A.dylib
       0x19f4f9000 -        0x1a051cfff  MetalPerformanceShadersGraph arm64  <c63300c9521d31c5bce2c53f1daa6650> /System/Library/Frameworks/MetalPerformanceShadersGraph.framework/MetalPerformanceShadersGraph
       0x1a051d000 -        0x1a0abefff  libswiftCore.dylib arm64  <e9b1dc6b7fef3bbbb083f4e8faaa53df> /usr/lib/swift/libswiftCore.dylib
       0x1a0abf000 -        0x1a0b00b34  libswiftPrespecialized.dylib arm64  <a60c51d4e0e8363e90a4110a0d93f1f2> /usr/lib/libswiftPrespecialized.dylib
       0x1a0b01000 -        0x1a0b34ffb  CoreServicesInternal arm64  <6c069b24efe63a9facb6609247014c22> /System/Library/PrivateFrameworks/CoreServicesInternal.framework/CoreServicesInternal
       0x1a0b35000 -        0x1a1865fff  Foundation arm64  <7274dde368d634a08e677726e1265e80> /System/Library/Frameworks/Foundation.framework/Foundation
       0x1a1866000 -        0x1a1a95fff  WebGPU arm64  <836f7c6c57bd3ce9a7e2d67bec54e689> /System/Library/PrivateFrameworks/WebGPU.framework/WebGPU
       0x1a1a96000 -        0x1a1cf8fff  Metal arm64  <c699f21c7c513168b5f734c029e55401> /System/Library/Frameworks/Metal.framework/Metal
       0x1a1cf9000 -        0x1a1f2ffff  CoreServices arm64  <472e685d98ff3176a744411100947046> /System/Library/Frameworks/CoreServices.framework/CoreServices
       0x1a1f30000 -        0x1a2473fff  CoreFoundation arm64  <6a60be13e6573beca9acba239ae29862> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
       .........more
    
Extra Information:

Stack Dump (0x000000016bd2de90-0x000000016bd2df80):

E2000000E2000000B8007895C5A356D8080008000000000020724F0A020000000000000000000000C0B53A230100000080B43A2301000000B8007895C5A356D8080008000000000020724F0A0200000020724F0A02000000C0B53A23000000000000000000000000000000FF000000000600000000000000000000000000000020E0D26B01000000E0B7FAA301000000000000000000000000200E000000000090C73F2501000000C0394F0A02000000080008000000000020724F0A020000000000000000000000020000000000000020410A0103000000000000000000000000200E00000000000070530601000000

Notable Addresses:
{}

Application Stats:
{
    "active_time_since_last_crash": 2334.18,
    "active_time_since_launch": 2334.18,
    "application_active": true,
    "application_in_foreground": true,
    "background_time_since_last_crash": 767.486,
    "background_time_since_launch": 767.486,
    "launches_since_last_crash": 1,
    "sessions_since_last_crash": 4,
    "sessions_since_launch": 4
}

Incident Identifier: 5F6FD41E-FF7A-4953-AAD3-0A51EBA92624
CrashReporter Key:   7505507639971381a237a594d721bdc0a44d89cb
Hardware Model:      iPad13,16
Process:         Ai-POSX [2824]
Path:            /private/var/containers/Bundle/Application/77294858-92E8-449E-9E9E-B6D0C0BB02DA/Ai-POSX.app/Ai-POSX
Identifier:      b4i.AiPOSX
Version:         4.39 (4.39)
Code Type:       ARM-64
Parent Process:  ? [1]

Date/Time:       2025-01-14 09:40:43.000 +1000
OS Version:      iPadOS 18.2.1 (22C161)
Report Version:  104

Exception Type:  0 (SIGPIPE)
Exception Codes: 0x00000000 at 0x00000001a1f3d650
Crashed Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   CoreFoundation                  0x00000001a1f3d650 0x1a1f30000 + 54864 (__CFStringHash + 120)
1   CoreFoundation                  0x00000001a1f3d3d0 0x1a1f30000 + 54224 (<redacted> + 108)
2   UIKitCore                       0x00000001a4774390 0x1a474c000 + 164752 (<redacted> + 56)
3   UIKitCore                       0x00000001a47740e0 0x1a474c000 + 164064 (<redacted> + 132)
4   UIKitCore                       0x00000001a4774218 0x1a474c000 + 164376 (<redacted> + 288)
5   QuartzCore                      0x00000001a3a20cdc 0x1a3a08000 + 101596 (<redacted> + 148)
6   QuartzCore                      0x00000001a3a20b50 0x1a3a08000 + 101200 (<redacted> + 204)
7   QuartzCore                      0x00000001a3a9a36c 0x1a3a08000 + 598892 (<redacted> + 128)
8   Ai-POSX                         0x00000001049aeea0 0x1042a8000 + 7368352 (-[B4ICanvas Refresh] + 120)
9   Ai-POSX                         0x00000001043e0f38 0x1042a8000 + 1281848 ( + 1072)
10  Ai-POSX                         0x00000001049868ec 0x1042a8000 + 7203052 (__21-[B4ICommon Sleep:::]_block_invoke + 48)
11  libdispatch.dylib               0x00000001a9cdffa8 0x1a9cdc000 + 16296 (<redacted> + 20)
12  libdispatch.dylib               0x00000001a9ce345c 0x1a9cdc000 + 29788 (<redacted> + 596)
13  libdispatch.dylib               0x00000001a9cf7620 0x1a9cdc000 + 112160 (<redacted> + 420)
14  libdispatch.dylib               0x00000001a9cf61e8 0x1a9cdc000 + 106984 (<redacted> + 836)
15  libdispatch.dylib               0x00000001a9cee948 0x1a9cdc000 + 76104 (<redacted> + 748)
16  libdispatch.dylib               0x00000001a9cee64c 0x1a9cdc000 + 75340 (_dispatch_main_queue_callback_4CF + 44)
17  CoreFoundation                  0x00000001a1fa9bbc 0x1a1f30000 + 498620 (<redacted> + 16)
18  CoreFoundation                  0x00000001a1fa61b0 0x1a1f30000 + 483760 (<redacted> + 1996)
19  CoreFoundation                  0x00000001a1ff8274 0x1a1f30000 + 819828 (CFRunLoopRunSpecific + 588)
20  GraphicsServices                0x00000001ef1414c0 0x1ef140000 + 5312 (GSEventRunModal + 164)
21  UIKitCore                       0x00000001a4b3a77c 0x1a474c000 + 4122492 (<redacted> + 816)
22  UIKitCore                       0x00000001a4760e64 0x1a474c000 + 85604 (UIApplicationMain + 340)
23  Ai-POSX                         0x00000001042ac064 0x1042a8000 + 16484 ( + 100)
24  (null) 0x00000001c81b4de8 0x0 + 7652199912

Thread 1 name:  com.apple.uikit.eventfetch-thread
Thread 1:
0   libsystem_kernel.dylib          0x00000001f355a788 0x1f3559000 + 6024 (mach_msg2_trap + 8)
1   libsystem_kernel.dylib          0x00000001f355de98 0x1f3559000 + 20120 (mach_msg2_internal + 80)
2   libsystem_kernel.dylib          0x00000001f355ddb0 0x1f3559000 + 19888 (mach_msg_overwrite + 424)
3   libsystem_kernel.dylib          0x00000001f355dbfc 0x1f3559000 + 19452 (mach_msg + 24)
4   CoreFoundation                  0x00000001a1fa67f4 0x1a1f30000 + 485364 (<redacted> + 160)
5   CoreFoundation                  0x00000001a1fa5ea0 0x1a1f30000 + 482976 (<redacted> + 1212)
6   CoreFoundation                  0x00000001a1ff8274 0x1a1f30000 + 819828 (CFRunLoopRunSpecific + 588)
7   Foundation                      0x00000001a0b5eb48 0x1a0b35000 + 170824 (<redacted> + 212)
8   Foundation                      0x00000001a0cbb6f4 0x1a0b35000 + 1599220 (<redacted> + 64)
9   UIKitCore                       0x00000001a4bcdb80 0x1a474c000 + 4725632 (<redacted> + 420)
10  Foundation                      0x00000001a0c4aa54 0x1a0b35000 + 1137236 (<redacted> + 724)
11  libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 2:
0   libsystem_kernel.dylib          0x00000001f35602b0 0x1f3559000 + 29360 (__semwait_signal + 8)
1   libsystem_c.dylib               0x00000001a9d3a5cc 0x1a9d22000 + 99788 (nanosleep + 220)
2   Foundation                      0x00000001a13e1238 0x1a0b35000 + 9093688 (<redacted> + 160)
3   Ai-POSX                         0x00000001049f11f0 0x1042a8000 + 7639536 (-[B4IUDPSocket readerThread] + 668)
4   Foundation                      0x00000001a0c4aa54 0x1a0b35000 + 1137236 (<redacted> + 724)
5   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 3:
0   libsystem_kernel.dylib          0x00000001f35602b0 0x1f3559000 + 29360 (__semwait_signal + 8)
1   libsystem_c.dylib               0x00000001a9d3a5cc 0x1a9d22000 + 99788 (nanosleep + 220)
2   libsystem_c.dylib               0x00000001a9d3a444 0x1a9d22000 + 99396 (sleep + 52)
3   Ai-POSX                         0x0000000104a99f94 0x1042a8000 + 8331156 ( + 132)
4   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 4 name:  KSCrash Exception Handler (Secondary)
Thread 4:
0   libsystem_kernel.dylib          0x00000001f355a788 0x1f3559000 + 6024 (mach_msg2_trap + 8)
1   libsystem_kernel.dylib          0x00000001f355de98 0x1f3559000 + 20120 (mach_msg2_internal + 80)
2   libsystem_kernel.dylib          0x00000001f355bcfc 0x1f3559000 + 11516 (thread_suspend + 108)
3   Ai-POSX                         0x0000000104a96808 0x1042a8000 + 8316936 ( + 152)
4   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 5 name:  KSCrash Exception Handler (Primary)
Thread 5:
0   libsystem_kernel.dylib          0x00000001f355a788 0x1f3559000 + 6024 (mach_msg2_trap + 8)
1   libsystem_kernel.dylib          0x00000001f355de98 0x1f3559000 + 20120 (mach_msg2_internal + 80)
2   libsystem_kernel.dylib          0x00000001f355ddb0 0x1f3559000 + 19888 (mach_msg_overwrite + 424)
3   libsystem_kernel.dylib          0x00000001f355dbfc 0x1f3559000 + 19452 (mach_msg + 24)
4   Ai-POSX                         0x0000000104a96840 0x1042a8000 + 8316992 ( + 208)
5   libsystem_pthread.dylib         0x000000022ca517d0 0x22ca50000 + 6096 (_pthread_start + 136)

Thread 6:
0   libsystem_pthread.dylib         0x000000022ca5146c 0x22ca50000 + 5228 (pthread_getspecific + 12)

Thread 7:
0   libsystem_kernel.dylib          0x00000001f355a510 0x1f3559000 + 5392 (__workq_kernreturn + 8)
1   libsystem_pthread.dylib         0x000000022ca536cc 0x22ca50000 + 14028 (_pthread_wqthread + 364)

Thread 8:
0   libsystem_kernel.dylib          0x00000001f355a510 0x1f3559000 + 5392 (__workq_kernreturn + 8)
1   libsystem_pthread.dylib         0x000000022ca536cc 0x22ca50000 + 14028 (_pthread_wqthread + 364)

Thread 9:

Thread 0 crashed with ARM-64 Thread State:
  cpsr: 0x0000000000001000     fp: 0x000000016bb56300     lr: 0x00000001a1f3d3d0     pc: 0x00000001a1f3d650
    sp: 0x000000016bb562c0     x0: 0x000000020c35d460     x1: 0x00000002165128d8    x10: 0x00000001a3d5a58f
   x11: 0x00000000000007c8    x12: 0x0000000000000005    x13: 0x00000001094c5880    x14: 0x000000020a5014d0
   x15: 0x000000020a5014d0    x16: 0x000000020a5024c0    x17: 0x00000001a1f3e100    x18: 0x0000000000000000
   x19: 0x000000020c35d460     x2: 0x000000020c35d460    x20: 0x0000000303d04b50    x21: 0x0000000000000047
   x22: 0x0000000303cfa280    x23: 0x00000001133ed040    x24: 0x0000000106948780    x25: 0x000000020a4f7220
   x26: 0x0000000000080008    x27: 0x000000020a4f39c0    x28: 0x000000020a4f3a40    x29: 0x000000016bb56300
    x3: 0x000000020c35d460     x4: 0x0000000000000000     x5: 0x0000000000000000     x6: 0x00000000000007fd
    x7: 0x0000000000f9092c     x8: 0x0000000000000008     x9: 0x000000020c35d468

Binary Images:
       0x1042a8000 -        0x104bb3fff +Ai-POSX arm64  <cb8faa9fb4de3c6a958cdfc7674935ad> /private/var/containers/Bundle/Application/77294858-92E8-449E-9E9E-B6D0C0BB02DA/Ai-POSX.app/Ai-POSX
       0x105890000 -        0x10589bfff  libobjc-trampolines.dylib arm64  <be05652226b13a508ad193ac99fcdc9c> /private/preboot/Cryptexes/OS/usr/lib/libobjc-trampolines.dylib
       0x19f4a8000 -        0x19f4f8ccf  libobjc.A.dylib arm64  <3ed8b852087d3b6ea36fceafed8e93ae> /usr/lib/libobjc.A.dylib
       0x19f4f9000 -        0x1a051cfff  MetalPerformanceShadersGraph arm64  <c63300c9521d31c5bce2c53f1daa6650> /System/Library/Frameworks/MetalPerformanceShadersGraph.framework/MetalPerformanceShadersGraph
       0x1a051d000 -        0x1a0abefff  libswiftCore.dylib arm64  <e9b1dc6b7fef3bbbb083f4e8faaa53df> /usr/lib/swift/libswiftCore.dylib
       0x1a0abf000 -        0x1a0b00b34  libswiftPrespecialized.dylib arm64  <a60c51d4e0e8363e90a4110a0d93f1f2> /usr/lib/libswiftPrespecialized.dylib
       0x1a0b01000 -        0x1a0b34ffb  CoreServicesInternal arm64  <6c069b24efe63a9facb6609247014c22> /System/Library/PrivateFrameworks/CoreServicesInternal.framework/CoreServicesInternal
       0x1a0b35000 -        0x1a1865fff  Foundation arm64  <7274dde368d634a08e677726e1265e80> /System/Library/Frameworks/Foundation.framework/Foundation
       0x1a1866000 -        0x1a1a95fff  WebGPU arm64  <836f7c6c57bd3ce9a7e2d67bec54e689> /System/Library/PrivateFrameworks/WebGPU.framework/WebGPU
       0x1a1a96000 -        0x1a1cf8fff  Metal arm64  <c699f21c7c513168b5f734c029e55401> /System/Library/Frameworks/Metal.framework/Metal
       0x1a1cf9000 -        0x1a1f2ffff  CoreServices arm64  <472e685d98ff3176a744411100947046> /System/Library/Frameworks/CoreServices.framework/CoreServices
       0x1a1f30000 -        0x1a2473fff  CoreFoundation arm64  <6a60be13e6573beca9acba239ae29862> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
       0x1a2474000 -        0x1a3424fff  Network arm64  <5389a7437c0f3a37b35c6825a8263f94> /System/Library/Frameworks/Network.framework/Network
       0x1a3425000 -        0x1a37e9fff  CFNetwork arm64  <9987879240643260b5b2779a99b9f64e> /System/Library/Frameworks/CFNetwork.framework/CFNetwork
       0x1a37ea000 -        0x1a3a07fff  CoreTelephony arm64  <4fce9fdac4c9349687b92f426e9ed142> /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony
       ...........more

Extra Information:

Stack Dump (0x000000016bb56270-0x000000016bb56360):

D063B56B01000000DC42F3A101000000403A4F0A02000000C0394F0A020000004F00000000000000C030421B010000000064B56B010000004843F3A10100000001000000000000000100000000000000080008000000000020724F0A02000000000000000000000040D03E130100000080A2CF0303000000C08F461B01000000FFFFFFFFFFFFFFFF60D4350C020000002063B56B01000000904377A401000000C08F461B0100000060D4350C020000004063B56B01000000E04077A40100000060D4350C0200000080A2CF0303000000C063B56B01000000184277A4010000009063B56B010000007CA355F301000000

Notable Addresses:
{
    "x1": {
        "address": 8964352216,
        "type": "string",
        "value": "hash"
    },
    "x10": {
        "address": 7043655055,
        "type": "string",
        "value": "contents"
    }
}

Application Stats:
{
    "active_time_since_last_crash": 434.15,
    "active_time_since_launch": 434.15,
    "application_active": true,
    "application_in_foreground": true,
    "background_time_since_last_crash": 148.285,
    "background_time_since_launch": 148.285,
    "launches_since_last_crash": 1,
    "sessions_since_last_crash": 2,
    "sessions_since_launch": 2
}

From the above 2 logs, gathered that the crash might have something to do with b4xcanvas. So, I went through the entire project looking for a B4xcanvas being initialized inside a loop or not being released after usage, but I found none like that.

One other step that I took hoping to solve the issue was to disable the UDP broadcast as the the exception type was [SIGPIPE], and as I understand happens when trying to access a socket that has been closed. Not sure whether this is the cause of the issue.

Anyway any help or insight on this will be very valuable to me. It is a cross platform app, the issue only persists for the iOS app. Have not been able to recreate the issue. Thanks.

 

[Erel]

It does look related to the canvas. Can you post the code with the call to Sleep and the canvas drawings?

 

[AneeshJay]

It does look related to the canvas. Can you post the code with the call to Sleep and the canvas drawings?

Thanks for your reply. The only modules that use canvas are AnotherDatePicker class module, QRGenerator class module and a function I got that resizes bitmap. And AnotherDatePicker is the only one that calls sleep before proceeding with the drawings.

Public Sub DesignerCreateView (Base As Object, Lbl As Label, Props As Map)
    mBase = Base
    Dim mlbl As B4XView = Lbl
#if B4J
    Dim form As Form = Props.Get("Form")
    MainPanel = form.RootPane
    Dim df As TextField
    df.Initialize("DateField")
    Dim b As Button
    b.Initialize("btnOpen")
    Dim fx As JFX
    b.Font = fx.CreateFontAwesome(30)
    b.WrapText = False
#else if B4A
    MainPanel = Props.Get("activity")
    Dim df As EditText
    df.Initialize("DateField")
    df.SingleLine = True
    df.Padding = Array As Int(20dip,0,0,0)
    Dim b As Button
    b.Initialize("btnOpen")
    b.Typeface = Typeface.FONTAWESOME
#else if B4i
    MainPanel = Props.Get("page")
    Dim df As TextField
    df.Initialize("DateField")
    Dim b As Button
    b.Initialize("btnOpen", b.STYLE_SYSTEM)
    b.CustomLabel.Font = Font.CreateFontAwesome(30)
#end if
    btnOpen = b
    dateField = df
    dateField.Font = mlbl.Font
    dateField.SetColorAndBorder(xui.Color_White, 1dip, xui.Color_Black, 15dip)
    dateField.TextColor = mlbl.TextColor
    dateField.Enabled = False
    mBase.AddView(dateField, 0,0,0,0)
    btnOpen.Font = xui.CreateFontAwesome(UiCodeModule.ViewStyles.POSButton.TextSize)
    btnOpen.Text = Chr(0xF073)
    btnOpen.TextColor = xui.Color_RGB(209,32,39)
    mBase.AddView(btnOpen, 0,0,0,0)
    'It is not possible to load a layout file directly from DesignerCreateView.
    Sleep(0)
    selectedColor = xui.PaintOrColorToColor(Props.Get("SelectedColor"))
    tempSelectedColor = xui.PaintOrColorToColor(Props.Get("HighlightedColor"))
    pnlDialog = xui.CreatePanel("")
    MainPanel.AddView(pnlDialog, 0, 0, 520dip,500dip)
    pnlDialog.LoadLayout("datepicker")
    pnlDialog.Visible = False
    pnlDialog.SetColorAndBorder(xui.PaintOrColorToColor(Props.Get("BackgroundColor")), 1dip, selectedColor, 10dip)
    pnlDialog.Tag = Me
#if B4i
    For Each v As B4XView In pnlDialog.GetAllViewsRecursive
        UiCodeModule.SetStyleForView(v)
    Next
#End If
#if B4A
    Dim p As Panel = pnlDialog
    p.Elevation = 4dip
#End If
    month = DateTime.GetMonth(DateTime.Now)
    year = DateTime.GetYear(DateTime.Now)
    minYear = Props.Get("MinYear")
    maxYear = Props.Get("MaxYear")
    months = DateUtils.GetMonthsNames
    If selectedDate - INVALID_DATE = 0 Then selectedDate = DateTime.Now
    setDate(selectedDate)
    cvs.Initialize(DaysPaneFg)
    cvsBackground.Initialize(DaysPaneBg)
    boxW = cvs.TargetRect.Width / 7
    boxH = cvs.TargetRect.Height / 6
    vCorrection = 5dip
    If xui.IsB4i Then vCorrection = 9dip
    cvsDays.Initialize(DaysTitlesPane)
    Dim alldays As List = Regex.Split("\|", "Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday") 'need to escape the splitting character.
    firstDay = alldays.IndexOf(Props.Get("FirstDay"))
    Dim daysFont As B4XFont = xui.CreateDefaultBoldFont(14)
    Dim i As Int
    Dim days As List = DateUtils.GetDaysNames
    For i = firstDay To firstDay + 7 - 1
        Dim d As String = days.Get(i Mod 7)
        cvsDays.DrawText(d.SubString2(0, 2), (i - firstDay + 0.5) * boxW, 20dip, daysFont, xui.Color_Gray, "CENTER")
    Next
    cvsDays.Invalidate
    #if B4J
    Dim p As Pane = DaysPaneFg
    p.MouseCursor = fx.Cursors.HAND
    #End If
    Base_Resize(mBase.Width, mBase.Height)
End Sub

QR code printing is not available for this customer. So no chance for that part of code was executed. I'll post the code anyway.

Private Sub DrawMatrix
    cvs.DrawRect(cvs.TargetRect, xui.Color_White, True, 0)
    Dim r As B4XRect
    For y = 0 To NumberOfModules - 1
        For x = 0 To NumberOfModules - 1
            r.Initialize((x + 4) * ModuleSize, (y + 4) * ModuleSize, 0, 0)
            r.Width = ModuleSize
            r.Height = ModuleSize
            Dim clr As Int
            If Matrix(x, y) Then
                clr = xui.Color_Black
                'cvs.DrawCircle(r.CenterX, r.CenterY, r.Width / 2, clr, True, 0)
                cvs.DrawRect(r, clr, True, 0)
            End If
        Next
    Next
End Sub

Again, the option to print through the app is not available to this customer. But will post it anyway

Sub ResizeBitmapForPrinting(bmp As B4XBitmap, CropHeight As Int) As B4XBitmap  'ignore
    Dim printWidth As Int = 576
    If ResDetails.POSPrinter.PrintWidth > Globals.mPrintWidth.w80mm Then
        printWidth = 544
    End If
  
    Dim scaleFactor As Float = DataModel.MyConfig.BitmapMagFactor
    If bmp.Height < 1500 Then
        scaleFactor = (printWidth / bmp.Width)
    End If
  
    Dim printHeight As Int = bmp.Height * scaleFactor
    Dim DrawPanel As B4XView
    DrawPanel = Xui.CreatePanel("") 'InitializeMutable(printWidth, printHeight)
    DrawPanel.SetLayoutAnimated(0, 0, 0, printWidth, printHeight)
  
    Dim cvs As B4XCanvas
    cvs.Initialize(DrawPanel)
  
    Dim DRect As B4XRect
    DRect.Initialize(0, 0, printWidth, printHeight)
  
    bmp.Crop(0, 0, bmp.Width, bmp.Height)
  
    cvs.DrawBitmap(bmp, DRect)
    cvs.Invalidate
  
    Return cvs.CreateBitmap
End Sub

 

[Erel]

The Sleep might come from a preceding step. I think that the problem is somewhere else. Not much that I can say...

 

[AneeshJay]

Alright! After I have turned off the UDP, the crash has not occurred since. That is very interesting. Maybe the app was trying to broadcast through a busy port and it's a snowball effect that led to a high CPU usage eventually being killed by the OS. Anyway thanks for taking time to look into this Erel. Appreciate it!