我有Android应用程序，大量使用移植到Android的ffmpeg。它在大多数设备上运行良好，但在Galaxy Tab 10上崩溃：
06-20 13:16:36.136 505-561/? D/CrashAnrDetector﹕ Build: samsung/espresso10rfxx/espresso10rf:4.2.2/JDQ39/P5100XXDMJ2:user/release-keys
Hardware: piranha
Revision: 9
Bootloader: unknown
Radio: unknown
Kernel: Linux version 3.0.31-1919150 (se.infra@SEP-107) (gcc version 4.4.1 (Sourcery G++ Lite 2010q1-202) ) #1 SMP PREEMPT Fri Oct 18 15:31:19 KST 2013
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
Build fingerprint: 'samsung/espresso10rfxx/espresso10rf:4.2.2/JDQ39/P5100XXDMJ2:user/release-keys'
Revision: '9'
pid: 22003, tid: 22003, name: om.company.project >>> com.company.project <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr deadbaad
r0 00000027 r1 deadbaad r2 401b5258 r3 00000000
r4 00000000 r5 bebb936c r6 00000004 r7 40d63400
r8 00000000 r9 409d81b0 sl 4000c0d8 fp 00000001
ip 62675144 sp bebb9368 lr 4018854d pc 40184be2 cpsr 60000030
d0 65706d666662696c d1 732e6e6f656e2d67
d2 732e30323763692e d3 2f322d6c6f6f6863
d4 ff00edc0e4c09680 d5 000c000c000c000c
d6 03fc0378033000e0 d7 3f8000003f800000
d8 41c0000000000000 d9 000000a13f000000
d10 0000000000000000 d11 0000000000000000
d12 0000000000000000 d13 0000000000000000
d14 0000000000000000 d15 0000000000000000
d16 00ffffffffffffff d17 004c481a004aca6e
d18 004f4372004dc5c6 d19 00523eca0050c11e
d20 00f5403e00ef803c d21 0101404100fb403f
d22 0000004400000042 d23 0000004700000045
d24 010d404401074042 d25 0119404701134045
d26 0000004300000041 d27 0000004600000044
d28 00f5400000ef8000 d29 0101400000fb4000
d30 0000000100000001 d31 0000000100000001
scr 60000010
backtrace:
#00 pc 0001abe2 /system/lib/libc.so
#01 pc 00018208 /system/lib/libc.so (abort+4)
#02 pc 0066b8e0 /data/app-lib/com.company.project-2/libffmpeg-neon.so
#03 pc 000032b3 /system/bin/linker
#04 pc 0000510b /system/bin/linker
#05 pc 0004f973 /system/lib/libdvm.so (dvmLoadNativeCode(char const*, Object*, char**)+186)
#06 pc 0006681d /system/lib/libdvm.so
#07 pc 000276e0 /system/lib/libdvm.so
#08 pc 0002b5c4 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)
#09 pc 0005fc79 /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+272)
#10 pc 0005fca3 /system/lib/libdvm.so (dvmCallMethod(Thread*, Method const*, Object*, JValue*, ...)+20)
#11 pc 0006ad49 /system/lib/libdvm.so (dvmInitClass+1036)
#12 pc 000225dc /system/lib/libdvm.so (dvmAsmSisterStart+412)
#13 pc 0002b5c4 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)
#14 pc 0005ff4f /system/lib/libdvm.so (dvmInvokeMethod(Object*, Method const*, ArrayObject*, ArrayObject*, ClassObject*, bool)+374)
#15 pc 00067879 /system/lib/libdvm.so
#16 pc 000276e0 /system/lib/libdvm.so
#17 pc 0002b5c4 /system/lib/libdvm.so (dvmInterpret(Thread*, Method const*, JValue*)+184)
#18 pc 0005fc79 /system/lib/libdvm.so (dvmCallMethodV(Thread*, Method const*, Object*, bool, JValue*, std::__va_list)+272)
#19 pc 00049a43 /system/lib/libdvm.so
#20 pc 00047f43 /system/lib/libandroid_runtime.so
#21 pc 000492df /system/lib/libandroid_runtime.so (android::AndroidRuntime::start(char const*, char const*)+390)
#22 pc 00000db7 /system/bin/app_process
#23 pc 0001287f /system/lib/libc.so (__libc_init+38)
#24 pc 00000ae8 /system/bin/app_process
stack:
bebb9328 f930001d
bebb932c 5f7a1cc8
bebb9330 4015bcf8 /system/bin/linker
bebb9334 4015bf40 /system/bin/linker
bebb9338 4015c4f4
bebb933c 4015b0ac /system/bin/linker
bebb9340 401b2254 /system/lib/libc.so
bebb9344 401b21b4 /system/lib/libc.so
bebb9348 00000000
bebb934c 4018854d /system/lib/libc.so (_fwalk+32)
bebb9350 00000001
bebb9354 bebb936c [stack]
bebb9358 00000004
bebb935c 40d63400 [heap]
bebb9360 df0027ad
bebb
由于输出中没有应用符号（JNI代码中没有我的方法），我怎么能理解错误？是否缺少.so lib应该在加载libffmpeg.so之前加载？
答案 0 :(得分：1)
查看地址-DEADBAAD。用英文注意它？这意味着它是故意设置的（对它的几率是天文数字）。特别是它是JVM用来覆盖Java引用中不再有效的指针的值。因此，您将值传递给不再有效的C代码，或者C代码保留在引用上，而没有通过增加其引用计数来正确告知VM它这样做。如果你的代码是多线程的，那么这通常是竞争条件的结果。
答案 1 :(得分：1)
您可以使用Android NDK提供的ndk-stack工具。 详细信息可以从NDK doc找到： 机器人-NDK-r10d \文档\ Programmers_Guide \ HTML \ md_3__key__topics__debugging__n_d_k-_s_t_a_c_k.htm
此工具基本上可以帮助您将内存中的内容转换为人类可读的调试信息。有时，它非常有帮助。
从NDK文档中复制以下内容：
该工具可以转换以下信息
I/DEBUG ( 31): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG ( 31): Build fingerprint: 'generic/google_sdk/generic/:2.2/FRF91/43546:eng/test-keys'
I/DEBUG ( 31): pid: 351, tid: 351 %gt;%gt;%gt; /data/local/ndk-tests/crasher <<<
I/DEBUG ( 31): signal 11 (SIGSEGV), fault addr 0d9f00d8
I/DEBUG ( 31): r0 0000af88 r1 0000a008 r2 baadf00d r3 0d9f00d8
I/DEBUG ( 31): r4 00000004 r5 0000a008 r6 0000af88 r7 00013c44
I/DEBUG ( 31): r8 00000000 r9 00000000 10 00000000 fp 00000000
I/DEBUG ( 31): ip 0000959c sp be956cc8 lr 00008403 pc 0000841e cpsr 60000030
I/DEBUG ( 31): #00 pc 0000841e /data/local/ndk-tests/crasher
I/DEBUG ( 31): #01 pc 000083fe /data/local/ndk-tests/crasher
I/DEBUG ( 31): #02 pc 000083f6 /data/local/ndk-tests/crasher
I/DEBUG ( 31): #03 pc 000191ac /system/lib/libc.so
I/DEBUG ( 31): #04 pc 000083ea /data/local/ndk-tests/crasher
I/DEBUG ( 31): #05 pc 00008458 /data/local/ndk-tests/crasher
I/DEBUG ( 31): #06 pc 0000d362 /system/lib/libc.so
I/DEBUG ( 31):
进入更易读的输出：
********** Crash dump: **********
Build fingerprint: 'generic/google_sdk/generic/:2.2/FRF91/43546:eng/test-keys'
pid: 351, tid: 351 >>> /data/local/ndk-tests/crasher <<<
signal 11 (SIGSEGV), fault addr 0d9f00d8
Stack frame #00 pc 0000841e /data/local/ndk-tests/crasher : Routine zoo in /tmp/foo/crasher/jni/zoo.c:13
Stack frame #01 pc 000083fe /data/local/ndk-tests/crasher : Routine bar in /tmp/foo/crasher/jni/bar.c:5
Stack frame #02 pc 000083f6 /data/local/ndk-tests/crasher : Routine my_comparison in /tmp/foo/crasher/jni/foo.c:9
Stack frame #03 pc 000191ac /system/lib/libc.so
Stack frame #04 pc 000083ea /data/local/ndk-tests/crasher : Routine foo in /tmp/foo/crasher/jni/foo.c:14
Stack frame #05 pc 00008458 /data/local/ndk-tests/crasher : Routine main in /tmp/foo/crasher/jni/main.c:19
Stack frame #06 pc 0000d362 /system/lib/libc.so