Compile this with Xcode 11 "release" and it will crash on ARMv7 due to misaligned read. Use a "single view" iOS App as your template, and replace AppDelegate.m with this code.

MisalignedRead.m

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@end

__attribute__((noinline)) double GPBCodedInputStreamReadDouble(uint8_t *buf) {
  int64_t value = OSReadLittleInt64(buf, 0);
  double result;
  memcpy(&result, &value, sizeof(result));
  return result;
}


@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Override point for customization after application launch.
  double data[3] = {1, 2};
  uint8_t *bytes = ((uint8_t*)(data)) + 1;
  double a = GPBCodedInputStreamReadDouble(bytes);
  NSLog(@"%f", a);
  return YES;
}

@end