立即写入失败:用SSH中断管道到嵌入式系统

Question

如前所述，当我试图将SSH放入我的嵌入式系统(一个使用内核4.1运行Angstr m的De0-Nano-SoCFPGA开发板)时，我得到了一个“写失败:断管”-Error并断开了连接。我读到，这通常与网络问题和超时有关，但在我的例子中，它是立即发生的，所以它不可能是一个超时问题(对吗？)

我正在寻找这个问题的其他解决方案，或者其他可能导致这条错误信息的问题。

更新:另一个方向(SSH从嵌入式到主机PC)工作得完美无缺！

这是来自tcpdump | grep cyclone5的输出，巨无霸是主机PC，cyclone5是嵌入式设备，fritz.box是我的路由器：

16:56:01.080879 IP6 juggernaut.fritz.box.48641 > fritz.box.domain: 3129+ A? cyclone5. (26)
16:56:01.080885 IP6 juggernaut.fritz.box.48641 > fritz.box.domain: 28063+ AAAA? cyclone5. (26)
16:56:01.082341 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [S], seq 1263535780, win 28640, options [mss 1432,sackOK,TS val 932516 ecr 0,nop,wscale 7], length 0
16:56:01.083400 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [S.], seq 983702311, ack 1263535781, win 28400, options [mss 1432,sackOK,TS val 55053 ecr 932516,nop,wscale 7], length 0
16:56:01.083410 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [.], ack 1, win 224, options [nop,nop,TS val 932516 ecr 55053], length 0
16:56:01.083528 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 1:40, ack 1, win 224, options [nop,nop,TS val 932516 ecr 55053], length 39
16:56:01.084584 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 40, win 222, options [nop,nop,TS val 55053 ecr 932516], length 0
16:56:01.117746 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 1:22, ack 40, win 222, options [nop,nop,TS val 55056 ecr 932516], length 21
16:56:01.117773 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [.], ack 22, win 224, options [nop,nop,TS val 932525 ecr 55056], length 0
16:56:01.118222 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [.], seq 40:1460, ack 22, win 224, options [nop,nop,TS val 932525 ecr 55056], length 1420
16:56:01.118415 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 1460:2008, ack 22, win 224, options [nop,nop,TS val 932525 ecr 55056], length 548
16:56:01.118667 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2008, win 253, options [nop,nop,TS val 55056 ecr 932525], length 0
16:56:01.121526 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 22:934, ack 2008, win 253, options [nop,nop,TS val 55057 ecr 932525], length 912
16:56:01.123158 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2008:2056, ack 934, win 246, options [nop,nop,TS val 932526 ecr 55057], length 48
16:56:01.159565 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2056, win 253, options [nop,nop,TS val 55061 ecr 932526], length 0
16:56:01.164976 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 934:1214, ack 2056, win 253, options [nop,nop,TS val 55061 ecr 932526], length 280
16:56:01.167861 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2056:2072, ack 1214, win 261, options [nop,nop,TS val 932538 ecr 55061], length 16
16:56:01.168671 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2072, win 253, options [nop,nop,TS val 55061 ecr 932538], length 0
16:56:01.168678 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2072:2116, ack 1214, win 261, options [nop,nop,TS val 932538 ecr 55061], length 44
16:56:01.169453 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2116, win 253, options [nop,nop,TS val 55061 ecr 932538], length 0
16:56:01.169760 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 1214:1258, ack 2116, win 253, options [nop,nop,TS val 55062 ecr 932538], length 44
16:56:01.169857 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2116:2176, ack 1258, win 261, options [nop,nop,TS val 932538 ecr 55062], length 60
16:56:01.209580 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2176, win 253, options [nop,nop,TS val 55066 ecr 932538], length 0
16:56:01.491968 IP6 fritz.box.domain > juggernaut.fritz.box.49687: 37977* 1/1/3 PTR cyclone5.fritz.box. (208)
16:56:03.119066 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 1258:1334, ack 2176, win 253, options [nop,nop,TS val 55256 ecr 932538], length 76
16:56:03.119134 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2176:2252, ack 1334, win 261, options [nop,nop,TS val 933025 ecr 55256], length 76
16:56:03.119954 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2252, win 253, options [nop,nop,TS val 55257 ecr 933025], length 0
16:56:03.122701 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 1334:1394, ack 2252, win 253, options [nop,nop,TS val 55257 ecr 933025], length 60
16:56:03.159841 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [.], ack 1394, win 261, options [nop,nop,TS val 933036 ecr 55257], length 0
16:56:11.034026 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2252:2328, ack 1394, win 261, options [nop,nop,TS val 935004 ecr 55257], length 76
16:56:11.069809 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2328, win 253, options [nop,nop,TS val 56052 ecr 935004], length 0
16:56:11.165970 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 1394:1438, ack 2328, win 253, options [nop,nop,TS val 56061 ecr 935004], length 44
16:56:11.165983 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [.], ack 1438, win 261, options [nop,nop,TS val 935037 ecr 56061], length 0
16:56:11.166024 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2328:2404, ack 1438, win 261, options [nop,nop,TS val 935037 ecr 56061], length 76
16:56:11.166816 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [.], ack 2404, win 253, options [nop,nop,TS val 56061 ecr 935037], length 0
16:56:11.167921 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [P.], seq 1438:1466, ack 2404, win 253, options [nop,nop,TS val 56061 ecr 935037], length 28
16:56:11.167985 IP6 juggernaut.fritz.box.59915 > cyclone5.fritz.box.ssh: Flags [P.], seq 2404:2508, ack 1466, win 261, options [nop,nop,TS val 935038 ecr 56061], length 104
16:56:11.173648 IP6 cyclone5.fritz.box.ssh > juggernaut.fritz.box.59915: Flags [R.], seq 1466, ack 2508, win 253, options [nop,nop,TS val 0 ecr 935038], length 0

Answer 1

看起来不像网络问题，tcpdump中有一个通信流。看起来ssh服务器中断了连接。有时，一些简化的ssh服务器运行在嵌入式系统上，以节省时间/空间等。

1)查看ssh服务器端的日志，即嵌入式设备。应该有东西的。

2)启用ssh客户端(通常为ssh -vvv )中的详细内容。

Answer 2

我认为你的问题与网络有关99%，但是，考虑一下1%.你的操作系统在闪存上运行吗？

在基于usb和sdcard的安装上，我也遇到了类似的问题。有时系统变得不稳定，重新安装RO和第一个症状之一是不成功的ssh连接，具有相同的错误输出。当我有幸保留一个现存的ssh会话时，我几乎可以正常工作在我的机器上，包括其他服务器。