问题描述
我已将几个低级 C 库移植并创建到 Android 以在我的应用程序中使用.我使用 NDK 对它们进行了交叉编译，然后使用 System.loadLibrary() 链接到它们.一段时间后，我的应用程序崩溃了，似乎是由于库中的错误:
I have ported and created several low-level C-libraries to Android for my use in my application. I cross-compiled them using the NDK, and then link to them using System.loadLibrary(). After some amount of time, my application crashes, seemingly due to a bug in the library:
07-28 11:31:21.675: INFO/DEBUG(2880): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
07-28 11:31:21.675: INFO/DEBUG(2880): Build fingerprint: 'verizon/voles/sholes/sholes:2.2.2/FRG83G/91102:user/release-keys'
07-28 11:31:21.675: INFO/DEBUG(2880): pid: 2893, tid: 2894 >>> com.gnychis.coexisyst <<<
07-28 11:31:21.675: INFO/DEBUG(2880): signal 11 (SIGSEGV), fault addr 2d4eedb4
07-28 11:31:21.675: INFO/DEBUG(2880): r0 2d4eeda4 r1 00000000 r2 00000024 r3 00000000
07-28 11:31:21.675: INFO/DEBUG(2880): r4 00d3e770 r5 00000000 r6 4184ff98 r7 4184ffa4
07-28 11:31:21.675: INFO/DEBUG(2880): r8 100ffad0 r9 4184ff9c 10 4184ff84 fp 100ffe30
07-28 11:31:21.675: INFO/DEBUG(2880): ip 85b7efec sp 100ffa88 lr 845d13f8 pc 845f8c38 cpsr 60000010
07-28 11:31:21.675: INFO/DEBUG(2880): d0 6472656767756265 d1 4472fb3844714069
07-28 11:31:21.675: INFO/DEBUG(2880): d2 4186eeec4186ee6e d3 4186ef544186ef74
07-28 11:31:21.675: INFO/DEBUG(2880): d4 4186ef544186ef20 d5 418998f84186ef88
07-28 11:31:21.675: INFO/DEBUG(2880): d6 418999604189992c d7 418999c841899994
07-28 11:31:21.675: INFO/DEBUG(2880): d8 0000000000000000 d9 0000000000000000
07-28 11:31:21.675: INFO/DEBUG(2880): d10 0000000000000000 d11 0000000000000000
07-28 11:31:21.675: INFO/DEBUG(2880): d12 0000000000000000 d13 0000000000000000
07-28 11:31:21.675: INFO/DEBUG(2880): d14 0000000000000000 d15 0000000000000000
07-28 11:31:21.675: INFO/DEBUG(2880): d16 0113580000000001 d17 3fe999999999999a
07-28 11:31:21.675: INFO/DEBUG(2880): d18 42eccefa43de3400 d19 3fe00000000000b4
07-28 11:31:21.675: INFO/DEBUG(2880): d20 4008000000000000 d21 3fd99a27ad32ddf5
07-28 11:31:21.675: INFO/DEBUG(2880): d22 3fd24998d6307188 d23 3fcc7288e957b53b
07-28 11:31:21.675: INFO/DEBUG(2880): d24 3fc74721cad6b0ed d25 3fc39a09d078c69f
07-28 11:31:21.675: INFO/DEBUG(2880): d26 0000000000000000 d27 0000000000000000
07-28 11:31:21.675: INFO/DEBUG(2880): d28 0000000000000000 d29 0000000000000000
07-28 11:31:21.675: INFO/DEBUG(2880): d30 0000000000000000 d31 0000000000000000
07-28 11:31:21.675: INFO/DEBUG(2880): scr 80000012
07-28 11:31:21.753: INFO/DEBUG(2880): #00 pc 005f0c38 /data/data/com.gnychis.coexisyst/lib/libtshark.so
07-28 11:31:21.761: INFO/DEBUG(2880): #01 pc 005c93f4 /data/data/com.gnychis.coexisyst/lib/libtshark.so
07-28 11:31:21.761: INFO/DEBUG(2880): #02 pc 00001dd2 /data/data/com.gnychis.coexisyst/lib/libwireshark_helper.so
07-28 11:31:21.761: INFO/DEBUG(2880): #03 pc 00001d9a /data/data/com.gnychis.coexisyst/lib/libwireshark_helper.so
07-28 11:31:21.761: INFO/DEBUG(2880): #04 pc 00016e34 /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #05 pc 000452c4 /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #06 pc 0001bd98 /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #07 pc 00022794 /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #08 pc 00021634 /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #09 pc 0005c5cc /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #10 pc 0005c7fc /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #11 pc 0005203e /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #12 pc 000520ca /system/lib/libdvm.so
07-28 11:31:21.761: INFO/DEBUG(2880): #13 pc 000525a0 /system/lib/libdvm.so
07-28 11:31:21.769: INFO/DEBUG(2880): #14 pc 0004f9ec /system/lib/libdvm.so
07-28 11:31:21.769: INFO/DEBUG(2880): #15 pc 00010ed4 /system/lib/libc.so
07-28 11:31:21.769: INFO/DEBUG(2880): #16 pc 000109c0 /system/lib/libc.so
07-28 11:31:21.769: INFO/DEBUG(2880): code around pc:
07-28 11:31:21.769: INFO/DEBUG(2880): 845f8c18 ebfda8d5 eaffffdf e5950014 e3500000
07-28 11:31:21.769: INFO/DEBUG(2880): 845f8c28 0affffdc ebfdc232 eaffffda e92d4070
07-28 11:31:21.769: INFO/DEBUG(2880): 845f8c38 e5904010 e1a05000 e3540000 0a000004
07-28 11:31:21.769: INFO/DEBUG(2880): 845f8c48 e5940000 ebfdac25 e5944004 e3540000
07-28 11:31:21.769: INFO/DEBUG(2880): 845f8c58 1afffffa e1a00005 e8bd4070 eafdd2ef
07-28 11:31:21.769: INFO/DEBUG(2880): code around lr:
07-28 11:31:21.769: INFO/DEBUG(2880): 845d13d8 e1a01003 eafe72bb e92d4010 e1a04000
07-28 11:31:21.769: INFO/DEBUG(2880): 845d13e8 e2800008 ebfe4c98 e5940000 ebfe4a3b
07-28 11:31:21.769: INFO/DEBUG(2880): 845d13f8 e5940004 e3500000 0a000001 e8bd4010
07-28 11:31:21.769: INFO/DEBUG(2880): 845d1408 eafe7322 e8bd8010 e92d4010 e1a04000
07-28 11:31:21.769: INFO/DEBUG(2880): 845d1418 ebfe690a e1a00004 e8bd4010 eafe46d2
07-28 11:31:21.769: INFO/DEBUG(2880): stack:
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa48 afd43724 /system/lib/libc.so
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa4c 00000004
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa50 00d417e0 [heap]
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa54 00000008
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa58 00000000
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa5c afd10280 /system/lib/libc.so
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa60 00d417e0 [heap]
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa64 00000000
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa68 0024a330 [heap]
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa64 00000000
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa68 0024a330 [heap]
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa6c 00000001
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa70 00000008
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa74 00000000
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa78 00d3e778 [heap]
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa7c 8063b4af /system/lib/libglib-2.0.so
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa80 df002777
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa84 e3a070ad
07-28 11:31:21.769: INFO/DEBUG(2880): #00 100ffa88 00d3e770 [heap]
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa8c 00000000
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa90 4184ff98
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa94 845d13f8 /data/data/com.gnychis.coexisyst/lib/libtshark.so
07-28 11:31:21.769: INFO/DEBUG(2880): #01 100ffa98 100ffaf0
07-28 11:31:21.769: INFO/DEBUG(2880): 100ffa9c 80d01dd5 /data/data/com.gnychis.coexisyst/lib/libwireshark_helper.so
首先，我不完全确定如何正确解释它，以及是否有任何内存地址对我真正有用.例如，我可以获取内存地址并确定故障发生在哪个函数中吗?根据堆栈，哪个库是发生故障的库?
First off, I'm not entirely sure how to properly interpret it, and if any of the memory addresses are actually useful for me. For example, can I take a memory address and determine which function the fault happened in? Based on the stack, which library was the one where the fault occurred?
故障需要一些时间才能发生，因此单步执行代码似乎有点棘手.有没有办法获得核心转储或任何东西?我曾尝试使用来自本机代码的日志消息，但日志消息不足以帮助我缩小问题范围.
The fault takes some time to happen, so stepping through code seems a little tricky. Is there a way to get a core dump or anything? I have attempted using log messages from the native code, but the log messages are not helpful enough for me to narrow the problem.
推荐答案
如果你的应用程序真的在原生代码中崩溃，我强烈推荐以下方法:
If your application is truly crashing in native code, I highly recommend the following:
- 设置一个 java 断点，该断点将在您的本机库加载后但开始执行之前触发.
- 转到终端并启动 ndk 的 gdb 版本(称为ndk-gdb").最初，只需键入c"继续.
- 返回java，继续执行.
- 一旦您的应用崩溃，gdb 将暂停，您可以通过bt"命令(回溯)检查本机代码中堆栈的完整性.
无论如何，您应该能够完全调试本机代码并通过 ndk-gdb 捕获问题.您可以在本地安装的 ndk 中找到有关 ndk 版本 gdb 的特定文档(例如，在我的机器上它就在这里):
At any rate, you should be able to fully debug native code and catch problems via ndk-gdb. You can find specific documentation on the ndk's version of gdb in your local installation of the ndk (for example, on my machine it's here):
android-ndk-r6/documentation.html
android-ndk-r6/documentation.html
最后，这是一个关于 gdb 的基础教程:
Finally, here's a basic tutorial on gdb:
gdb 教程
希望这会有所帮助！
这篇关于在原生库中调试崩溃的最简单方法，由 Android 应用程序链接?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！