A/libc致命信号11（SIGSEGV） - PJSIP，Android＆Marmalade
问题描述：
我在使用Marmalade构建在Android上运行的应用程序，该应用程序可以将视频呼叫转移到移动设备上的其他应用程序。视频通话由PJSIP库处理。当连接视频源时，出现以下错误：A/libc致命信号11（SIGSEGV） - PJSIP，Android＆Marmalade
A/libc: Fatal signal 11 (SIGSEGV) at 0x00000000 (code=1), thread 7813 (Thread-146)
这导致应用程序崩溃。这是什么原因？
我认为这可能与Marmalade在某些时候会导致与PJSIP的空指针引用有关，但是由于此PJSIP构建在PJSUA示例应用程序中完美工作，因此我在此停留。
我测试过这个没有视频，它按预期运行。我已经在我的设备上测试了PJSUA示例应用程序，并且可以按照预期使用视频。
这墓碑图案的一部分：
01-02 12:04:11.580 1228-1228/? I/DEBUG: Revision: '0'
01-02 12:04:11.580 1228-1228/? I/DEBUG: pid: 7657, tid: 7813, name: Thread-146 >>> com.x.x<<<
01-02 12:04:11.580 1228-1228/? I/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
01-02 12:04:11.590 1233-1635/? W/V4L2CameraDevice: GetPreviewFrame: VIDIOC_DQBUF Failed, Invalid argument
01-02 12:04:11.590 1233-1635/? D/V4L2CameraDevice: preview_num: 6, picture_num: 0
01-02 12:04:11.740 1228-1228/? I/DEBUG: r0 00000000 r1 00000001 r2 00000000 r3 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: r4 623a2c64 r5 5ddcefb0 r6 62327098 r7 5e1d4a98
01-02 12:04:11.740 1228-1228/? I/DEBUG: r8 62327098 r9 00100000 sl 5e1d4a98 fp 627c3904
01-02 12:04:11.740 1228-1228/? I/DEBUG: ip 00004000 sp 627c3060 lr 62328310 pc 621141e0 cpsr 000f0010
01-02 12:04:11.740 1228-1228/? I/DEBUG: d0 0000000300000004 d1 0000000100000001
01-02 12:04:11.740 1228-1228/? I/DEBUG: d2 3164626130316330 d3 3836312e32393140
01-02 12:04:11.740 1228-1228/? I/DEBUG: d4 a20f000200000000 d5 00000000d201a8c0
01-02 12:04:11.740 1228-1228/? I/DEBUG: d6 0000000000000000 d7 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d8 0000000000000000 d9 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d10 0000000000000000 d11 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d12 0000000000000000 d13 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d14 0000000000000000 d15 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d16 40f5180800000000 d17 3fe0000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d18 3fdffffffffffe48 d19 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d20 3fe00000000000dc d21 3ff0000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d22 8000000000000000 d23 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d24 0000000000000000 d25 8000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d26 3ff0000000000000 d27 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d28 0000000000000000 d29 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: d30 0000000000000000 d31 0000000000000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: scr 80000010
01-02 12:04:11.740 1228-1228/? I/DEBUG: backtrace:
01-02 12:04:11.740 1228-1228/? I/DEBUG: #00 pc 000301e0 /data/app-lib/com.x.x-1/libpjsua.so (on_call_media_state(int)+180)
01-02 12:04:11.740 1228-1228/? I/DEBUG: #01 pc 0024430c /data/app-lib/com.x.x-1/libpjsua.so (pj_mutex_unlock+224)
01-02 12:04:11.740 1228-1228/? I/DEBUG: stack:
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3020 6235c590 /data/app-lib/com.x.x-1/libpjsua.so
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3024 00000008
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3028 627c306c [stack:7813]
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c302c 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3030 623b8e70
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3034 623b8568
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3038 63164fa4
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c303c 623b8470
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3040 00000001
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3044 00000001
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3048 0000001b
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c304c 00000002
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3050 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3054 623a2c64 /data/app-lib/com.x.x-1/libpjsua.so
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3058 df0027ad
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c305c 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: #00 627c3060 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: ........ ........
01-02 12:04:11.740 1228-1228/? I/DEBUG: #01 627c3060 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3064 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3068 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c306c 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3070 00000001
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3074 00000000
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3078 627c33f8 [stack:7813]
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c307c 00000019
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3080 627c34f8 [stack:7813]
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3084 00000018
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3088 627c35f8 [stack:7813]
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c308c 0000001b
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3090 627c36f8 [stack:7813]
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3094 0000001b
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c3098 627c37f8 [stack:7813]
01-02 12:04:11.740 1228-1228/? I/DEBUG: 627c309c 00000033
当我检查这一切看起来正常的远程登录，它只是停止，当应用程序崩溃：
12:04:11.410 pjsua_call.c !Answering call 0: code=200
12:04:11.411 pjsua_media.c ...Call 0: updating media..
12:04:11.412 pjsua_media.c .....Media stream call00:0 is destroyed
12:04:11.412 pjsua_aud.c ....Audio channel update..
12:04:11.412 strm0x5e1cf4f4 .....VAD temporarily disabled
12:04:11.413 strm0x5e1cf4f4 .....Encoder stream started
12:04:11.413 strm0x5e1cf4f4 .....Decoder stream started
12:04:11.414 pjsua_media.c ....Audio updated, stream #0: PCMU (sendrecv)
12:04:11.414 pjsua_media.c .....Media stream call00:1 is destroyed
12:04:11.415 pjsua_vid.c ....Video channel update..
12:04:11.475 vstenc0x632ef4 .....Encoder stream started
12:04:11.475 vstdec0x632ef4 .....Decoder stream started
12:04:11.475 pjsua_vid.c .....Setting up RX..
12:04:11.475 pjsua_vid.c ......Creating video window: type=stream, cap_id=-1, rend_id=0
12:04:11.475 vid_port.c .......Opening device OpenGL renderer [OpenGL] for render: format=I420, size=656x656 @22:1 fps
12:04:11.476 android_opengl .......Re-initializing OpenGL due to format change
12:04:11.476 android_opengl .......Android OpenGL ES renderer successfully created
12:04:11.476 vid_port.c .......Device OpenGL renderer [OpenGL] opened: format=I420, size=656x656 @22:1 fps
12:04:11.476 pjsua_vid.c .......stream window id 0 created for cap_dev=-1 rend_dev=0
12:04:11.477 pjsua_vid.c .......Window 0 created
12:04:11.477 android_opengl ......Starting Android opengl stream
12:04:11.478 pjsua_vid.c .....Setting up TX..
12:04:11.478 pjsua_vid.c ......Creating video window: type=preview, cap_id=1, rend_id=0
12:04:11.478 vid_port.c .......Opening device Colorbar generator [Colorbar] for capture: format=I420, size=352x288 @15:1 fps
12:04:11.478 vid_port.c .......Device Colorbar generator [Colorbar] opened: format=I420, size=352x288 @15:1 fps
12:04:11.479 vid_port.c .......Opening device OpenGL renderer [OpenGL] for render: format=I420, size=352x288 @15:1 fps
12:04:11.479 android_opengl .......Re-initializing OpenGL due to format change
12:04:11.479 android_opengl .......Android OpenGL ES renderer successfully created
12:04:11.479 vid_port.c .......Device OpenGL renderer [OpenGL] opened: format=I420, size=352x288 @15:1 fps
12:04:11.480 pjsua_vid.c .......preview window id 1 created for cap_dev=1 rend_dev=0
12:04:11.480 pjsua_vid.c .......Window 1 created
12:04:11.480 colorbar_dev.c ......Starting cbar video stream
12:04:11.480 pjsua_media.c ....Video updated, stream #1: H264 (sendrecv)
答
我加入解决了这个问题一些登录到PJSIP源文件以缩小发生这种情况的位置。
在pjsua_app_callback.cpp文件中，它有一个on_call_media_state方法，它在我的跟踪中提到过。
static void on_call_media_state(pjsua_call_id call_id)
{
#if PJMEDIA_HAS_VIDEO
pjsua_call_info call_info;
unsigned mi;
pjsua_call_get_info(call_id, &call_info);
for (mi=0; mi<call_info.media_cnt; ++mi) {
pjsua_call_media_info *med_info = &call_info.media[mi];
if (med_info->type == PJMEDIA_TYPE_VIDEO &&
med_info->status == PJSUA_CALL_MEDIA_ACTIVE &&
med_info->stream.vid.win_in != PJSUA_INVALID_ID)
{
winId = med_info->stream.vid.win_in;
registeredCallbackObject->onCallVideoStart();
break;
}
}
#endif
/* Forward to original callback */
if (pjsua_cb_orig.on_call_media_state)
(*pjsua_cb_orig.on_call_media_state)(call_id);
}
错误发生在for循环中，因为传入的call_info为null。
我编辑了这段代码，以适应我的情况，现在它工作正常。这可能是一个非常具体的问题，可能无法帮助那些致命信号11（SIGSEGV）。