Thanks for your advice!  I got the error message and the pstack result 
screenshot from one of our client.  I will try to use some OCR tools to 
convert the image to text next time.

For the questions:
1. The binary is built without race detector flag. I have checked it.
2. We do not use cgo. I will check if there is any unsafe package.

Unfortunately, I can not reproduce this problem. This is the first time and 
the only time I meet it.

Thanks!

On Saturday, January 6, 2018 at 1:28:24 AM UTC+8, Ian Lance Taylor wrote:
>
> On Fri, Jan 5, 2018 at 7:17 AM,  <she...@pingcap.com <javascript:>> 
> wrote: 
> > 
> > I meet a strange problem when running a program on Linux. I get "fatal: 
> > morestack on g0" from stderr. The process is still there but does not 
> > respond anymore. When I use `curl 
> > http://ip:port/debug/pprof/goroutine?debug=1` to check the stack, but it 
> > halts. There is nothing useful in stderr or dmesg. 
>
> (I would like to encourage you and everyone else to not post 
> screenshots of text.  Just include the text in the e-mail message as 
> text.  Screenshots of images, sure, but not text.  Thanks.) 
>
> The error "fatal: morestack on g0" should, of course, never happen. 
> The first questions are standard: have you run your program with the 
> race detector?  Do you use cgo or the unsafe package? 
>
> Beyond that, does the problem happen consistently?  Is there a way 
> that we can reproduce it? 
>
> Ian 
>

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