I've been seeing this crash for a few months now, and have not been able to reproduce this or make sense of the stack trace. I would really appreciate any help deciphering what the stack trace is telling me. I'm seeing mention of GRDB and from what I can tell, it looks like this is happening right as the app launches? The app does do some writing to GRDB on app launch, if that is of any relevance. Please let me know what would be a good approach to making sense of this stack trace and investigating this crash. Thank you so much in advance. Stack trace: Triggered by Thread: 0 Thread 0 name: Thread 0 Crashed: 0 libsystem_kernel.dylib 0x00000001d7159178 mach_msg2_trap + 8 (:-1) 1 libsystem_kernel.dylib 0x00000001d7158f10 mach_msg2_internal + 80 (mach_msg.c:201) 2 libsystem_kernel.dylib 0x00000001d7158e28 mach_msg_overwrite + 436 (mach_msg.c:0) 3 libsystem_kernel.dylib 0x00000001d7158c68 mach_msg + 24 (mach_msg.c:323) 4 CoreFoundation 0x000000018fa2fb1c __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2624) 5 CoreFoundation 0x000000018fa2da14 __CFRunLoopRun + 1208 (CFRunLoop.c:3007) 6 CoreFoundation 0x000000018fa2d478 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420) 7 GraphicsServices 0x00000001d2fae4f8 GSEventRunModal + 164 (GSEvent.c:2196) 8 UIKitCore 0x0000000191e5162c -[UIApplication _run] + 888 (UIApplication.m:3685) 9 UIKitCore 0x0000000191e50c68 UIApplicationMain + 340 (UIApplication.m:5270) 10 Ruby 0x0000000104f476d0 main + 64 (AppDelegate.swift:28) 11 dyld 0x00000001b2766dcc start + 2240 (dyldMain.cpp:1269) Thread 1 name: Thread 1: 0 libsystem_kernel.dylib 0x00000001d7166e5c guarded_pwrite_np + 8 (:-1) 1 libsqlite3.dylib 0x00000001b8e5a3e4 seekAndWrite + 456 (sqlite3.c:44224) … 40 libdispatch.dylib 0x00000001979f1300 _dispatch_client_callout + 20 (object.m:561) 41 libdispatch.dylib 0x0000000197a02dbc _dispatch_root_queue_drain + 864 (queue.c:7051) 42 libdispatch.dylib 0x0000000197a033ec _dispatch_worker_thread2 + 156 (queue.c:7119) 43 libsystem_pthread.dylib 0x00000001f9a1b928 _pthread_wqthread + 228 (pthread.c:2642) 44 libsystem_pthread.dylib 0x00000001f9a1ba04 start_wqthread + 8 (:-1) Thread 2: 0 libsystem_pthread.dylib 0x00000001f9a1b9fc start_wqthread + 0 (:-1) Thread 3: 0 libsystem_pthread.dylib 0x00000001f9a1b9fc start_wqthread + 0 (:-1) Thread 4 name: Thread 4: 0 libsystem_kernel.dylib 0x00000001d7159178 mach_msg2_trap + 8 (:-1) 1 libsystem_kernel.dylib 0x00000001d7158f10 mach_msg2_internal + 80 (mach_msg.c:201) 2 libsystem_kernel.dylib 0x00000001d7158e28 mach_msg_overwrite + 436 (mach_msg.c:0) 3 libsystem_kernel.dylib 0x00000001d7158c68 mach_msg + 24 (mach_msg.c:323) 4 CoreFoundation 0x000000018fa2fb1c __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2624) 5 CoreFoundation 0x000000018fa2da14 __CFRunLoopRun + 1208 (CFRunLoop.c:3007) 6 CoreFoundation 0x000000018fa2d478 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420) 7 Foundation 0x000000018e9c048c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212 (NSRunLoop.m:373) 8 Foundation 0x000000018e9ed74c -[NSRunLoop(NSRunLoop) runUntilDate:] + 64 (NSRunLoop.m:420) 9 UIKitCore 0x0000000191db34a8 -[UIEventFetcher threadMain] + 420 (UIEventFetcher.m:1208) 10 Foundation 0x000000018ea43de0 __NSThread__start__ + 732 (NSThread.m:991) 11 libsystem_pthread.dylib 0x00000001f9a1c4d4 _pthread_start + 136 (pthread.c:904) 12 libsystem_pthread.dylib 0x00000001f9a1ba10 thread_start + 8 (:-1) Thread 5 name: Thread 5: 0 libsystem_kernel.dylib 0x00000001d7159178 mach_msg2_trap + 8 (:-1) 1 libsystem_kernel.dylib 0x00000001d7158f10 mach_msg2_internal + 80 (mach_msg.c:201) 2 libsystem_kernel.dylib 0x00000001d7158e28 mach_msg_overwrite + 436 (mach_msg.c:0) 3 libsystem_kernel.dylib 0x00000001d7158c68 mach_msg + 24 (mach_msg.c:323) 4 CoreFoundation 0x000000018fa2fb1c __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2624) 5 CoreFoundation 0x000000018fa2da14 __CFRunLoopRun + 1208 (CFRunLoop.c:3007) 6 CoreFoundation 0x000000018fa2d478 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420) 7 CFNetwork 0x0000000190d2b060 +[__CFN_CoreSchedulingSetRunnable _run:] + 384 (CoreSchedulingSet.mm:1479) 8 Foundation 0x000000018ea43de0 __NSThread__start__ + 732 (NSThread.m:991) 9 libsystem_pthread.dylib 0x00000001f9a1c4d4 _pthread_start + 136 (pthread.c:904) 10 libsystem_pthread.dylib 0x00000001f9a1ba10 thread_start + 8 (:-1) Thread 6: 0 libsystem_pthread.dylib 0x00000001f9a1b9fc start_wqthread + 0 (:-1) Thread 7 name: Thread 7: 0 libsystem_kernel.dylib 0x00000001d7159178 mach_msg2_trap + 8 (:-1) 1 libsystem_kernel.dylib 0x00000001d7158f10 mach_msg2_internal + 80 (mach_msg.c:201) 2 libsystem_kernel.dylib 0x00000001d7158e28 mach_msg_overwrite + 436 (mach_msg.c:0) 3 libsystem_kernel.dylib 0x00000001d7158c68 mach_msg + 24 (mach_msg.c:323) 4 FirebaseCrashlytics 0x00000001065bf1f4 FIRCLSMachExceptionReadMessage + 56 (FIRCLSMachException.c:192) 5 FirebaseCrashlytics 0x00000001065bf1f4 FIRCLSMachExceptionServer + 104 (FIRCLSMachException.c:168) 6 libsystem_pthread.dylib 0x00000001f9a1c4d4 _pthread_start + 136 (pthread.c:904) 7 libsystem_pthread.dylib 0x00000001f9a1ba10 thread_start + 8 (:-1) Thread 8: 0 libsystem_pthread.dylib 0x00000001f9a1b9fc start_wqthread + 0 (:-1) Thread 0 crashed with ARM Thread State (64-bit): x0: 0x0000000010004005 x1: 0x0000000507000806 x2: 0x0000000200000000 x3: 0x0000250300000000 x4: 0x0000000000000000 x5: 0x0000250300000000 x6: 0x0000000000000002 x7: 0x00000000ffffffff x8: 0xfffffffffffffbbf x9: 0x0000000000002503 x10: 0x0000000000000000 x11: 0x0000000000000001 x12: 0x0000000000002503 x13: 0x0000000000050fc8 x14: 0x0000000000000000 x15: 0x0000000000000000 x16: 0xffffffffffffffd1 x17: 0x0000000197a390e4 x18: 0x0000000000000000 x19: 0x00000000ffffffff x20: 0x0000000000000002 x21: 0x0000250300000000 x22: 0x0000000000000000 x23: 0x0000250300000000 x24: 0x000000016b00e7b8 x25: 0x0000000200000000 x26: 0x0000000507000806 x27: 0x0000000507000806 x28: 0x0000000107000806 fp: 0x000000016b00e720 lr: 0x00000001d7158f10 sp: 0x000000016b00e6d0 pc: 0x00000001d7159178 cpsr: 0x1000 esr: 0x56000080 Address size fault

Hello. I have two crash reports that are likely related, with the following kernel triage: crash report 1: VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter crash report 2: VM - Compressor failed a blocking pager_get Both reports seem to indicate that the crash may be happening during (and perhaps caused by) the call to RubyLocalDB.saveStoreMetadata. I have attached the reports below. I would really appreciate any insight into what the kernel triages indicate based on the stack traces. Thank you. crash_report_1.crash crash_report_2.crash