我一直在阅读其他文章,以追踪SIGSEGV
在Android应用程序中获取的原因。我计划在我的应用程序中搜索与Canvas使用相关的可能的NullPointers,但我SIGSEGV
每次都会使用不同的内存地址。另外我看过code=1
和code=2
。如果内存地址是0x00000000
,那么我就知道它是NullPointer。
我得到的最后一个是code=2
:
A/libc(4969): Fatal signal 11 (SIGSEGV) at 0x42a637d9 (code=2)
关于如何追踪这个的任何建议?
我有一个嫌疑犯,但是我还不愿意尝试它。我的应用程序使用OSMDroid API进行离线映射。OverlayItem类表示地图上的标记/节点。我有一个服务,可通过网络收集数据以填充OverlayItem,然后将其显示在地图上。为了简化设计,我将OverlayItem扩展到我自己的NodeOverlayItem类中,该类包括我在UI Activity和Service中使用的一些附加属性。这给了我关于UI和服务的单点信息。当发生更改时,我使用Intents广播到Activity来刷新UI映射。活动绑定到服务,并且有一个Service方法来获取NodeOverlayItem的列表。我认为这可能是OSMDroid API对OverlayItem的使用,和我的服务同时更新节点信息。(并发问题)
在我撰写本文时,我认为这确实是问题所在。令人头疼的不是将Node和OverlayItem从NodeOverlayItem中分离出来,而是因为Activity需要来自Node的一些数据,而该数据是服务所拥有的。另外,当创建活动(onResume等)时,需要根据活动不在时服务一直在维护的Node数据重新创建OverlayItem对象。例如,您启动应用程序,服务会收集数据,UI会显示它,您转到首页,然后回到应用程序,活动将需要从最新的服务节点数据中提取并重新创建OverlayItem。
我知道这不是一个很好的或明确的问题。就像我所有的SO问题都是利基或晦涩的。如果有人对如何解释这些SIGSEGV
错误有任何建议,将不胜感激!
更新 这是在调试会话期间捕获的最新崩溃。我有3个这样的设备用于测试,在我进行开发和测试时,它们并不会全部崩溃。我添加了一些额外内容,以便可以记录GC日志记录。您可以看到该问题可能与内存耗尽无关。
03-03 02:02:38.328: I/CommService(7477): Received packet from: 192.168.1.102
03-03 02:02:38.328: I/CommService(7477): Already processed this packet. It's a re-broadcast from another node, or from myself. It's not a repeat broadcast though.
03-03 02:02:38.406: D/CommService(7477): Checking OLSRd info...
03-03 02:02:38.460: D/CommService(7477): Monitoring nodes...
03-03 02:02:38.515: D/dalvikvm(7477): GC_CONCURRENT freed 2050K, 16% free 17151K/20359K, paused 3ms+6ms
03-03 02:02:38.515: I/CommService(7477): Received packet from: 192.168.1.102
03-03 02:02:38.515: D/CommService(7477): Forwarding packet (4f68802cf10684a83ac4936ebb3c934d) along to other nodes.
03-03 02:02:38.609: I/CommService(7477): Received packet from: 192.168.1.100
03-03 02:02:38.609: D/CommService(7477): Forwarding packet (e4bc81e91ec92d06f83e03068f52ab4) along to other nodes.
03-03 02:02:38.609: D/CommService(7477): Already processed this packet: 4204a5b27745ffe5e4f8458e227044bf
03-03 02:02:38.609: A/libc(7477): Fatal signal 11 (SIGSEGV) at 0x68f52abc (code=1)
03-03 02:02:38.914: I/DEBUG(4008): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
03-03 02:02:38.914: I/DEBUG(4008): Build fingerprint: 'Lenovo/IdeaTab_A1107/A1107:4.0.4/MR1/eng.user.20120719.150703:user/release-keys'
03-03 02:02:38.914: I/DEBUG(4008): pid: 7477, tid: 7712 >>> com.test.testm <<<
03-03 02:02:38.914: I/DEBUG(4008): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 68f52abc
03-03 02:02:38.914: I/DEBUG(4008): r0 68f52ab4 r1 412ef268 r2 4d9c3bf4 r3 412ef268
03-03 02:02:38.914: I/DEBUG(4008): r4 001ad8f8 r5 4d9c3bf4 r6 412ef268 r7 4c479df8
03-03 02:02:38.914: I/DEBUG(4008): r8 4d9c3c0c r9 4c479dec 10 46cf260a fp 4d9c3c24
03-03 02:02:38.914: I/DEBUG(4008): ip 40262a04 sp 4d9c3bc8 lr 402d01dd pc 402d0182 cpsr 00000030
03-03 02:02:38.914: I/DEBUG(4008): d0 00000001000c0102 d1 3a22364574614c7d
03-03 02:02:38.914: I/DEBUG(4008): d2 403fc0000000007d d3 363737343433350a
03-03 02:02:38.914: I/DEBUG(4008): d4 49544341223a2273 d5 6f6567222c224556
03-03 02:02:38.914: I/DEBUG(4008): d6 3a223645676e6f4c d7 000000013835372d
03-03 02:02:38.914: I/DEBUG(4008): d8 0000000000000000 d9 4040000000000000
03-03 02:02:38.914: I/DEBUG(4008): d10 0000000000000000 d11 4040000000000000
03-03 02:02:38.914: I/DEBUG(4008): d12 4040000000000000 d13 0000000000000021
03-03 02:02:38.914: I/DEBUG(4008): d14 0000000000000000 d15 0000000000000000
03-03 02:02:38.914: I/DEBUG(4008): d16 3fe62e42fefa39ef d17 3ff0000000000000
03-03 02:02:38.914: I/DEBUG(4008): d18 3fe62e42fee00000 d19 0000000000000000
03-03 02:02:38.914: I/DEBUG(4008): d20 0000000000000000 d21 3ff0000000000000
03-03 02:02:38.914: I/DEBUG(4008): d22 4028000000000000 d23 3ff0000000000000
03-03 02:02:38.914: I/DEBUG(4008): d24 0000000000000000 d25 3ff0000000000000
03-03 02:02:38.914: I/DEBUG(4008): d26 0000000000000000 d27 c028000000000000
03-03 02:02:38.914: I/DEBUG(4008): d28 0000000000000000 d29 3ff0000000000000
03-03 02:02:38.914: I/DEBUG(4008): d30 3ff0000000000000 d31 3fecccccb5c28f6e
03-03 02:02:38.914: I/DEBUG(4008): scr 60000013
03-03 02:02:39.046: I/DEBUG(4008): #00 pc 0006b182 /system/lib/libcrypto.so (EVP_DigestFinal_ex)
03-03 02:02:39.046: I/DEBUG(4008): #01 pc 0006b1d8 /system/lib/libcrypto.so (EVP_DigestFinal)
03-03 02:02:39.054: I/DEBUG(4008): #02 pc 0001f814 /system/lib/libnativehelper.so
03-03 02:02:39.054: I/DEBUG(4008): #03 pc 0001ec30 /system/lib/libdvm.so (dvmPlatformInvoke)
03-03 02:02:39.054: I/DEBUG(4008): #04 pc 00058c70 /system/lib/libdvm.so (_Z16dvmCallJNIMethodPKjP6JValuePK6MethodP6Thread)
03-03 02:02:39.054: I/DEBUG(4008): code around pc:
03-03 02:02:39.054: I/DEBUG(4008): 402d0160 0003151e 4604b570 f7ff460d 4620ff81 ....p..F.F.... F
03-03 02:02:39.054: I/DEBUG(4008): 402d0170 f7ff4629 bd70ff93 4604b570 460e6800 )F....p.p..F.h.F
03-03 02:02:39.054: I/DEBUG(4008): 402d0180 68834615 dd062b40 21fa4810 44784a10 .F.h@+...H.!.JxD
03-03 02:02:39.054: I/DEBUG(4008): 402d0190 f7c8447a 6821f80f 698a4620 47904631 zD....!h F.i1F.G
03-03 02:02:39.054: I/DEBUG(4008): 402d01a0 b1154606 68836820 6822602b b12b6a13 .F.. h.h+`"h.j+.
03-03 02:02:39.054: I/DEBUG(4008): code around lr:
03-03 02:02:39.054: I/DEBUG(4008): 402d01bc 68e06821 21006c4a ea0af7c4 bd704630 !h.hJl.!....0Fp.
03-03 02:02:39.054: I/DEBUG(4008): 402d01cc 00031492 000314b5 4604b570 ffcef7ff ........p..F....
03-03 02:02:39.054: I/DEBUG(4008): 402d01dc 46204605 ff12f7ff bd704628 4604b573 .F F....(Fp.s..F
03-03 02:02:39.054: I/DEBUG(4008): 402d01ec 2102460d fb36f002 42ab6823 b123d020 .F.!..6.#h.B .#.
03-03 02:02:39.054: I/DEBUG(4008): 402d01fc b1136c5b f7c868e0 68a0fccf 05c26025 [l...h.....h%`..
03-03 02:02:39.054: I/DEBUG(4008): memory map around addr 68f52abc:
03-03 02:02:39.054: I/DEBUG(4008): 4d8c5000-4d9c4000
03-03 02:02:39.054: I/DEBUG(4008): (no map for address)
03-03 02:02:39.054: I/DEBUG(4008): b0001000-b0009000 /system/bin/linker
03-03 02:02:39.054: I/DEBUG(4008): stack:
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3b88 408d1f90 /system/lib/libdvm.so
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3b8c 412ef258 /dev/ashmem/dalvik-heap (deleted)
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3b90 00000001
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3b94 408d6c58 /system/lib/libdvm.so
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3b98 408d6fa8 /system/lib/libdvm.so
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3b9c 4c479dec
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3ba0 46cf260a /system/framework/core.odex
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3ba4 408735e7 /system/lib/libdvm.so
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3ba8 412ef258 /dev/ashmem/dalvik-heap (deleted)
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bac 002bf070 [heap]
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bb0 412ef258 /dev/ashmem/dalvik-heap (deleted)
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bb4 00000000
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bb8 412ef268 /dev/ashmem/dalvik-heap (deleted)
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bbc 00000000
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bc0 df0027ad
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bc4 00000000
03-03 02:02:39.054: I/DEBUG(4008): #00 4d9c3bc8 001ad8f8 [heap]
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bcc 002ae0b8 [heap]
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bd0 00000004
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bd4 402d01dd /system/lib/libcrypto.so
03-03 02:02:39.054: I/DEBUG(4008): #01 4d9c3bd8 001ad8f8 [heap]
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3bdc 002ae0b8 [heap]
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3be0 00000004
03-03 02:02:39.054: I/DEBUG(4008): 4d9c3be4 4024e817 /system/lib/libnativehelper.so
03-03 02:02:39.406: D/CommService(7477): Checking OLSRd info...
03-03 02:02:39.500: D/CommService(7477): Monitoring nodes...
03-03 02:02:39.500: D/dalvikvm(7477): GC_FOR_ALLOC freed 2073K, 16% free 17118K/20359K, paused 51ms
03-03 02:02:39.632: D/dalvikvm(7477): GC_CONCURRENT freed 1998K, 16% free 17162K/20359K, paused 2ms+4ms
03-03 02:02:40.406: D/CommService(7477): Checking OLSRd info...
03-03 02:02:40.445: D/CommService(7477): Monitoring nodes...
03-03 02:02:40.562: D/dalvikvm(7477): GC_CONCURRENT freed 2045K, 16% free 17158K/20359K, paused 3ms+4ms
03-03 02:02:41.406: D/CommService(7477): Checking OLSRd info...
03-03 02:02:41.445: D/CommService(7477): Monitoring nodes...
03-03 02:02:41.531: D/dalvikvm(7477): GC_CONCURRENT freed 2045K, 16% free 17154K/20359K, paused 3ms+12ms
03-03 02:02:42.406: D/CommService(7477): Checking OLSRd info...
03-03 02:02:42.445: D/CommService(7477): Monitoring nodes...
03-03 02:02:42.507: D/dalvikvm(7477): GC_CONCURRENT freed 2068K, 16% free 17128K/20359K, paused 3ms+4ms
03-03 02:02:42.679: D/dalvikvm(7477): GC_CONCURRENT freed 2006K, 16% free 17161K/20359K, paused 2ms+12ms
03-03 02:02:43.140: I/BootReceiver(1236): Copying /data/tombstones/tombstone_05 to DropBox (SYSTEM_TOMBSTONE)
03-03 02:02:43.210: D/dalvikvm(1236): GC_FOR_ALLOC freed 912K, 17% free 10207K/12295K, paused 62ms
03-03 02:02:43.265: D/dalvikvm(1236): GC_FOR_ALLOC freed 243K, 16% free 10374K/12295K, paused 49ms
03-03 02:02:43.265: I/dalvikvm-heap(1236): Grow heap (frag case) to 10.507MB for 196628-byte allocation
Java.Lang.Object
。整理出我的crashings