最近公司发新版本，跑压力测试的时候，发现有个模块最近会在应用来回切换的时候机器崩溃无反应，查看崩溃日志打印如下：
Incident Identifier: 14B207F4-CF49-49B5-AF5B-8F1DA5B7193B
CrashReporter Key:   b9fd57506b0748f7aea661b62c9b566011fbfd9a
Hardware Model:      iPhone4,1
OS Version:          iPhone OS 8.1.1 (12B435)
Kernel version:      Darwin Kernel Version 14.0.0: Mon Nov  3 22:25:03 PST 2014; root:xnu-2783.3.22~1/RELEASE_ARM_S5L8940X
Date:                2016-11-07 14:19:47 +0800
Exception Code:      0xdeaffeed
Reason:              Power assertion timeout for "com.apple.locationd.LocationHarvester.183b0a00(Wtw)".  Simply releasing it now.
Backtrace for power assertion: pid 64 (0x28525327 0x285257eb 0x3b2641 0x1a0067 0x3361df 0x33697d 0x11670b 0x3368f3 0x335f0b 0x191d05 0x19495b 0x4beb93 0x31a855d9 0x31a850a9 0x31a870d3 0x31a881fb 0x31bf8e25 0x31bf8b78)

Thermal data unavailable

Frontmost process PID:    169
Frontmost process PID:    43
Stackshot trace buffer size too small, trying again with 524288 bytes.
Jetsam Level:              0
Free Pages:             2315
Active Pages:          31496
Inactive Pages:        13916
Purgeable Pages:           3
Wired Pages:           23971
Speculative Pages:      2682
Throttled Pages:       54573
File-backed Pages:     46454
Compressions:              0
Decompressions:            0
Compressor Size:           0
Busy Buffer Count:         0
Pages Wanted:              0
Pages Reclaimed:           0

我想问有大神知道  com.apple.locationd.LocationHarvester 这个Id对应的是系统的哪个服务么，我想应该是调用这个服务引起的系统崩溃

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