mac/ios devicelab builds flaking on observatory port time out #106753
Description
Started on engine roll: 09c5863 (PR #106744) which only contains two Skia rolls, probably unrelated.
I don't think this is the same as #103511 (but I could be wrong), because:
- It passed the ios-debug-symbol-doctor diagnose step, and flutter doctor does not report any ios device errors
- The lldb backtrace looks different:
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9caac libsystem_kernel.dylib`mach_msg_trap + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] libsystem_kernel.dylib`mach_msg_trap:
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] -> 0x1bac9caac <+8>: ret
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] libsystem_kernel.dylib`mach_msg_overwrite_trap:
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] 0x1bac9cab0 <+0>: mov x16, #-0x20
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] 0x1bac9cab4 <+4>: svc #0x80
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] 0x1bac9cab8 <+8>: ret
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] Target 0: (Runner) stopped.
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread backtrace all
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] process continue
[complex_layout_ios__start_up] [STDOUT] stdout: [ +41 ms] * thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] * frame #0: 0x00000001bac9caac libsystem_kernel.dylib`mach_msg_trap + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001bac9d07c libsystem_kernel.dylib`mach_msg + 72
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x00000001803cfd78 CoreFoundation`__CFRunLoopServiceMachPort + 368
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x00000001803d4080 CoreFoundation`__CFRunLoopRun + 1160
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001803e7240 CoreFoundation`CFRunLoopRunSpecific + 572
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #5: 0x00000001a0eb7988 GraphicsServices`GSEventRunModal + 160
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #6: 0x0000000182be741c UIKitCore`-[UIApplication _run] + 1080
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #7: 0x0000000182980b88 UIKitCore`UIApplicationMain + 336
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #8: 0x000000010415bd3c Runner`main(argc=<unavailable>, argv=<unavailable>) at main.m:10:16 [opt]
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #9: 0x00000001042d43d0 dyld`start + 444
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #4, name = 'com.apple.uikit.eventfetch-thread'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9caac libsystem_kernel.dylib`mach_msg_trap + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001bac9d07c libsystem_kernel.dylib`mach_msg + 72
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x00000001803cfd78 CoreFoundation`__CFRunLoopServiceMachPort + 368
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x00000001803d4080 CoreFoundation`__CFRunLoopRun + 1160
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001803e7240 CoreFoundation`CFRunLoopRunSpecific + 572
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #5: 0x0000000181af4efc Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 232
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #6: 0x0000000181b34010 Foundation`-[NSRunLoop(NSRunLoop) runUntilDate:] + 88
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #7: 0x0000000182b6686c UIKitCore`-[UIEventFetcher threadMain] + 512
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #8: 0x0000000181b41c0c Foundation`__NSThread__start__ + 792
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #9: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #5
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9d014 libsystem_kernel.dylib`__workq_kernreturn + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #10, name = 'io.flutter.1.ui'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9caac libsystem_kernel.dylib`mach_msg_trap + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001bac9d07c libsystem_kernel.dylib`mach_msg + 72
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x00000001803cfd78 CoreFoundation`__CFRunLoopServiceMachPort + 368
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x00000001803d4080 CoreFoundation`__CFRunLoopRun + 1160
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001803e7240 CoreFoundation`CFRunLoopRunSpecific + 572
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #5: 0x0000000105a51b9c Flutter`fml::MessageLoopDarwin::Run() + 88
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #6: 0x0000000105a50c1c Flutter`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, fml::Thread::Thread(std::__1::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0> >(void*) + 208
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #7: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #11, name = 'io.flutter.1.raster'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9caac libsystem_kernel.dylib`mach_msg_trap + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001bac9d07c libsystem_kernel.dylib`mach_msg + 72
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x00000001803cfd78 CoreFoundation`__CFRunLoopServiceMachPort + 368
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x00000001803d4080 CoreFoundation`__CFRunLoopRun + 1160
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001803e7240 CoreFoundation`CFRunLoopRunSpecific + 572
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #5: 0x0000000105a51b9c Flutter`fml::MessageLoopDarwin::Run() + 88
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #6: 0x0000000105a50c1c Flutter`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, fml::Thread::Thread(std::__1::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0> >(void*) + 208
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #7: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #12, name = 'io.flutter.1.io'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9caac libsystem_kernel.dylib`mach_msg_trap + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001bac9d07c libsystem_kernel.dylib`mach_msg + 72
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x00000001803cfd78 CoreFoundation`__CFRunLoopServiceMachPort + 368
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x00000001803d4080 CoreFoundation`__CFRunLoopRun + 1160
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001803e7240 CoreFoundation`CFRunLoopRunSpecific + 572
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #5: 0x0000000105a51b9c Flutter`fml::MessageLoopDarwin::Run() + 88
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #6: 0x0000000105a50c1c Flutter`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, fml::Thread::Thread(std::__1::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0> >(void*) + 208
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #7: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #13, name = 'io.flutter.1.profiler'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9caac libsystem_kernel.dylib`mach_msg_trap + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001bac9d07c libsystem_kernel.dylib`mach_msg + 72
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x00000001803cfd78 CoreFoundation`__CFRunLoopServiceMachPort + 368
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x00000001803d4080 CoreFoundation`__CFRunLoopRun + 1160
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001803e7240 CoreFoundation`CFRunLoopRunSpecific + 572
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #5: 0x0000000105a51b9c Flutter`fml::MessageLoopDarwin::Run() + 88
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #6: 0x0000000105a50c1c Flutter`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, fml::Thread::Thread(std::__1::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0> >(void*) + 208
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #7: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #14, name = 'io.worker.1'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9d484 libsystem_kernel.dylib`__psynch_cvwait + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001db7dbbd4 libsystem_pthread.dylib`_pthread_cond_wait$VARIANT$mp + 1240
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x0000000197ce48e0 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 24
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x0000000105a4b8b0 Flutter`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, fml::ConcurrentMessageLoop::ConcurrentMessageLoop(unsigned long)::$_0> >(void*) + 304
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #15, name = 'io.worker.2'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9d484 libsystem_kernel.dylib`__psynch_cvwait + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x00000001db7dbbd4 libsystem_pthread.dylib`_pthread_cond_wait$VARIANT$mp + 1240
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x0000000197ce48e0 libc++.1.dylib`std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 24
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x0000000105a4b8b0 Flutter`void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, fml::ConcurrentMessageLoop::ConcurrentMessageLoop(unsigned long)::$_0> >(void*) + 304
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #4: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] thread #16, name = 'dart:io EventHandler'
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #0: 0x00000001bac9e294 libsystem_kernel.dylib`kevent + 8
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #1: 0x0000000105c34710 Flutter`dart::bin::EventHandlerImplementation::EventHandlerEntry(unsigned long) + 448
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #2: 0x0000000105c66044 Flutter`dart::bin::ThreadStart(void*) + 44
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] frame #3: 0x00000001db7d5348 libsystem_pthread.dylib`_pthread_start + 116
[complex_layout_ios__start_up] [STDOUT] stdout: [ ] (lldb) Process 4032 resuming