software-defined-radio - 运行 rtl_tcp 或 rtl_test 时 rtl-sdr 因“总线错误”而崩溃

Question

我在运行 Kali Linux Arm64 的 Raspberry Pi 3 上连接了一个 SDR 加密狗。SDR 本身就是这种特殊的模型

麻烦的是，每当我远程连接到rtl_tcp服务器时，它都会退出：

rtl_tcp -a 192.168.200.132
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
[R82XX] PLL not locked!
Tuned to 100000000 Hz.
listening...
Use the device argument 'rtl_tcp=192.168.200.132:1234' in OsmoSDR (gr-osmosdr) source
to receive samples in GRC and control rtl_tcp parameters (frequency, gain, ...).
client accepted! 192.168.200.102 64098
Allocating 15 zero-copy buffers
Bus error

测试rtl_test -t很好：

rtl_test -t
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.
No E4000 tuner found, aborting.

但是使用采样率进行测试会导致相同的不良行为。

rtl_test -s 2048000
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.

Info: This tool will continuously read from the device, and report if
samples get lost. If you observe no further output, everything is fine.

Reading samples in async mode...
Allocating 15 zero-copy buffers
Bus error

如何防止这种情况发生，并让RTL-SDR正常运行？

我尝试过的事情

没变：

我在 Kali 的 repos 中使用了 RTL-SDR，并使用git.osmocom.org/rtl-sdr.gitrepo 从源代码编译——没有变化
将交换文件大小增加到 2 GB — 没有变化

一些变化：

强制同步模式rtl_test不会产生错误。

rtl_test -s 2048000 -S
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.

Info: This tool will continuously read from the device, and report if
samples get lost. If you observe no further output, everything is fine.

Reading samples in sync mode...
(Samples are being lost but not reported.)

引入b标志rtl_tcp允许我设置缓冲区的数量，这似乎没有多大作用：

rtl_tcp -a 192.168.200.132 -b 1
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
[R82XX] PLL not locked!
Tuned to 100000000 Hz.
listening...
Use the device argument 'rtl_tcp=192.168.200.132:1234' in OsmoSDR (gr-osmosdr) source
to receive samples in GRC and control rtl_tcp parameters (frequency, gain, ...).
client accepted!
Allocating 1 zero-copy buffers
Bus error

score 1 · Accepted Answer

不知道能不能完整回答这个问题，但是我在调试USB3设备的时候也遇到过类似的错误。问题似乎出现了，不是因为不支持 USB3（它是一个 USB3 适配器），而是因为卡驱动程序无法分配足够的背板带宽来动态分配特定的 USB 管道。

我对 RPi 不是很熟悉——您是否尝试通过 USB-以太网/Wifi 加密狗将捕获路由出去？除了USB3，我想知道这是否是类似的动态带宽分配问题。

-- 不久前报道了与零拷贝缓冲区代码有关的事情： https ://www.mail-archive.com/osmocom-sdr@lists.osmocom.org/msg01204.html 从它在不同的方式，也应用了解决方法。

score 1 · Accepted Answer

我仍然不确定问题出在哪里，但根据@jsr 给我的指示，我继续删除zerocopy代码并重新编译rtl-sdr并且它工作。

这是一个差异。这可能是程序中的错误，需要解决。

diff --git a/src/librtlsdr.c b/src/librtlsdr.c
index 89ec903..61bcebc 100644
--- a/src/librtlsdr.c
+++ b/src/librtlsdr.c
@@ -1748,50 +1748,6 @@ static int _rtlsdr_alloc_async_buffers(rtlsdr_dev_t *dev)
        dev->xfer_buf = malloc(dev->xfer_buf_num * sizeof(unsigned char *));
        memset(dev->xfer_buf, 0, dev->xfer_buf_num * sizeof(unsigned char *));

-#if defined (__linux__) && LIBUSB_API_VERSION >= 0x01000105
-       fprintf(stderr, "Allocating %d zero-copy buffers\n", dev->xfer_buf_num);
-
-       dev->use_zerocopy = 1;
-       for (i = 0; i < dev->xfer_buf_num; ++i) {
-               dev->xfer_buf[i] = libusb_dev_mem_alloc(dev->devh, dev->xfer_buf_len);
-
-               if (dev->xfer_buf[i]) {
-                       /* Check if Kernel usbfs mmap() bug is present: if the
-                        * mapping is correct, the buffers point to memory that
-                        * was memset to 0 by the Kernel, otherwise, they point
-                        * to random memory. We check if the buffers are zeroed
-                        * and otherwise fall back to buffers in userspace.
-                        */
-                       if (dev->xfer_buf[i][0] || memcmp(dev->xfer_buf[i],
-                                                         dev->xfer_buf[i] + 1,
-                                                         dev->xfer_buf_len - 1)) {
-                               fprintf(stderr, "Detected Kernel usbfs mmap() "
-                                               "bug, falling back to buffers "
-                                               "in userspace\n");
-                               dev->use_zerocopy = 0;
-                               break;
-                       }
-               } else {
-                       fprintf(stderr, "Failed to allocate zero-copy "
-                                       "buffer for transfer %d\nFalling "
-                                       "back to buffers in userspace\n", i);
-                       dev->use_zerocopy = 0;
-                       break;
-               }
-       }
-
-       /* zero-copy buffer allocation failed (partially or completely)
-        * we need to free the buffers again if already allocated */
-       if (!dev->use_zerocopy) {
-               for (i = 0; i < dev->xfer_buf_num; ++i) {
-                       if (dev->xfer_buf[i])
-                               libusb_dev_mem_free(dev->devh,
-                                                   dev->xfer_buf[i],
-                                                   dev->xfer_buf_len);
-               }
-       }
-#endif
-
        /* no zero-copy available, allocate buffers in userspace */
        if (!dev->use_zerocopy) {
                for (i = 0; i < dev->xfer_buf_num; ++i) {

重新编译后，程序按预期工作：

~/sandbox/rtl-sdr# rtl_tcp -a 192.168.200.132 -f 89000 -b 100
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
[R82XX] PLL not locked!
[R82XX] PLL not locked!
Tuned to 89000 Hz.
listening...
Use the device argument 'rtl_tcp=192.168.200.132:1234' in OsmoSDR (gr-osmosdr) source
to receive samples in GRC and control rtl_tcp parameters (frequency, gain, ...).
client accepted!
set gain mode 1
set agc mode 0
set direct sampling 0
Disabled direct sampling mode
[R82XX] PLL not locked!
set offset tuning 0
set bias tee 0
set sample rate 1800000
[R82XX] PLL not locked!
ll+, now 1
set freq 24000000
set gain 495
ll+, now 2
set gain 495
set gain 495
set freq 106661000
ll+, now 3
ll+, now 4
ll+, now 5
ll+, now 6

software-defined-radio - 运行 rtl_tcp 或 rtl_test 时 rtl-sdr 因“总线错误”而崩溃

我尝试过的事情

2 回答 2

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