Hi,
-11 is -EAGAIN -- AFAIK connect() returning EAGAIN usually means the
listen() backlog is full.
Unless the test's purpose is to check connections are accepted quickly
under load, it may make sense to make the test handle EAGAIN instead
of failing on it, e.g. change
xyz = connect(...);
to something more like
int retries = 10;
do {
xyz = connect(...)
if(xyz >= 0 || errno != EAGAIN)
break;
sleep(1);
} while(--retries);
Hmm, I don't think the failure is that case, it passes for 4.14 and 4.9 kernel,
and it passes for other parameter combination as well.
And here, except this special case, I most want to know the methods on how to debug on kernel side functions.
With adding printk lines to find the real error happened function, it's not smart I think.
maybe others have good methods on such cases.
Thanks,
Yongqin Liu
On Fri, 27 Jul 2018 at 16:41, Yongqin Liu <yongqin.liu@linaro.org> wrote:
>
> Hi, Sumit, John, Amit, All
>
> I am investigating on the VtsKernelNetTest failure with HiKey 4.4 kernel, and I found the problem is that the socket.connect call returns -11,
> with adding printk lines in the SYSCALL_DEFINE3 of connect in socket.c file,
> I found that the error is returned by the line of "err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,sock->file->f_flags);"
> https://android.googlesource.com/kernel/hikey-linaro/+/android-hikey-linaro-4.4/net/socket.c#1557
>
> There actually I don't know which connect function is called, so I searched the .connect assignment in kernel/linaro/hisilicon-4.4/net/ipv4/
>
> and with adding printk lines, I found the implementation is tcp_v4_connect in net/ipv4/tcp_ipv4.c here:
> https://android.googlesource.com/kernel/hikey-linaro/+/android-hikey-linaro-4.4/net/ipv4/tcp_ipv4.c#141
>
> There with adding printk lines, I found it the -11 is returned by call of ip_route_connect here:
> https://android.googlesource.com/kernel/hikey-linaro/+/android-hikey-linaro-4.4/net/ipv4/tcp_ipv4.c#171
>
> Then I need to go to the definition of ip_route_connect to add printks and so on to find the real place where -11 is return, and check the reason there.
>
> but this work seems stupid and time consuming, I think there should be smart methods I need to learn.
>
> Could you please help go give some suggestion on what to do with such cases?
>
> Thanks in advance!
>
> --
> Best Regards,
> Yongqin Liu
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