iOS的在[dateFormatter stringFromDate:[NSDate new]]崩溃了

[hzx157]

提示 malloc: Heap corruption detected, free list is damaged at 0x2807fe200
*** Incorrect guard value: 0

thread #181, queue = 'com.apple.root.default-qos'
frame #0: 0x00000001b14d7bf8 CoreFoundation_CFStringGetLength2 + 56 frame #1: 0x00000001ab8a1a54 Foundation-[NSString rangeOfString:] + 24
frame #2: 0x00000001057f9ef0 Logan-[Logan getThreadNum](self=0x000000028069f6e0, _cmd="getThreadNum") at Logan.m:237:26 frame #3: 0x00000001057f955c Logan-[Logan writeLog:logType:](self=0x000000028069f6e0, _cmd="writeLog:logType:", log=0x000000028348fc30, type=1) at Logan.m:167:21
frame #4: 0x00000001057f8bd0 Loganlogan(type=1, log=0x000000028348fc30) at Logan.m:80:5 frame #5: 0x00000001022f847c LDMobile__39+[LDLogan message:tag:state:file:line:]_block_invoke(.block_descriptor=) at LDLogan.m:15:9 [opt]
frame #6: 0x00000001064f8028 libdispatch.dylib_dispatch_call_block_and_release + 24 frame #7: 0x00000001064f9860 libdispatch.dylib_dispatch_client_callout + 16
frame #8: 0x00000001064fc048 libdispatch.dylib_dispatch_queue_override_invoke + 924 frame #9: 0x000000010650baa4 libdispatch.dylib_dispatch_root_queue_drain + 356
frame #10: 0x000000010650c414 libdispatch.dylib_dispatch_worker_thread2 + 208 frame #11: 0x00000001f9eccb14 libsystem_pthread.dylib_pthread_wqthread + 224

• thread 200, queue = 'com.dianping.logan', stop reason = EXC_BAD_ACCESS (code=1, address=0x380000010)
  frame 0: 0x00000001aa83e014 libobjc.A.dylibobjc_msgSend + 20 frame 1: 0x00000001ab8e14b0 Foundation-[NSDateFormatter stringForObjectValue:] + 212
  • frame 2: 0x00000001057fce50 Logan+[Logan currentDate](self=0x000000010586d1c8, _cmd="currentDate") at Logan.m:529:12 frame 3: 0x00000001057f9728 Logan__26-[Logan writeLog:logType:]_block_invoke(.block_descriptor=0x00000002822b8c00) at Logan.m:179:27
    frame 4: 0x00000001064f8028 libdispatch.dylib_dispatch_call_block_and_release + 24 frame 5: 0x00000001064f9860 libdispatch.dylib_dispatch_client_callout + 16
    frame 6: 0x00000001065009bc libdispatch.dylib_dispatch_lane_serial_drain + 688 frame 7: 0x0000000106501634 libdispatch.dylib_dispatch_lane_invoke + 424
    frame 8: 0x000000010650d158 libdispatch.dylib_dispatch_workloop_worker_thread + 696 frame 9: 0x00000001f9eccb50 libsystem_pthread.dylib_pthread_wqthread + 284