I did but nothing detected.
However there aren't any goroutined involved (except for the http request),
other than that, this variable isn't shared among routines.
El jueves, 2 de mayo de 2019, 14:54:42 (UTC-3), Ian Lance Taylor escribió:
>
> On Thu, May 2, 2019 at 10:31 AM XXX ZZZ <emarti...@gmail.com <javascript:>>
> wrote:
> >
> > We are having a random panic on our go application that is happening
> once every million requests or so, and so far we haven't been able to
> reproduce it nor to even grasp what's going on.
> >
> > Basically our code goes like:
> >
> > type Subid_info struct{
> > Affiliate_subid string
> > Second_subid string
> > Second_subid_8 string
> > S2 string
> > Internal_subid string
> > Internal_subid_9 string
> > Internal_subid_12 string
> > Result string
> > }
> >
> > func (r *Subid_info) Prepare_subid_logic(){
> > r.Second_subid_8=fmt.Sprintf("1%07v", r.Second_subid) ----> panic
> happens here.
> > }
> >
> > And the trace we get is:
> >
> > panic: runtime error: invalid memory address or nil pointer dereference
> > [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x466b6e]
> >
> > goroutine 17091 [running]:
> > unicode/utf8.RuneCountInString(0x0, 0x5, 0xc048c275a8)
> > /usr/local/go/src/unicode/utf8/utf8.go:411 +0x2e
> > fmt.(*fmt).padString(0xc023c17780, 0x0, 0x5)
> > /usr/local/go/src/fmt/format.go:113 +0x134
> > fmt.(*fmt).fmtS(0xc023c17780, 0x0, 0x5)
> > /usr/local/go/src/fmt/format.go:347 +0x61
> > fmt.(*pp).fmtString(0xc023c17740, 0x0, 0x5, 0xc000000076)
> > /usr/local/go/src/fmt/print.go:448 +0x132
> > fmt.(*pp).printArg(0xc023c17740, 0x9978e0, 0xc016a68a30, 0x76)
> > /usr/local/go/src/fmt/print.go:684 +0x880
> > fmt.(*pp).doPrintf(0xc023c17740, 0xa6e22f, 0x5, 0xc048c27818, 0x1, 0x1)
> > /usr/local/go/src/fmt/print.go:1112 +0x3ff
> > fmt.Sprintf(0xa6e22f, 0x5, 0xc048c27818, 0x1, 0x1, 0x80, 0xa36200)
> > /usr/local/go/src/fmt/print.go:214 +0x66
> >
> code/sharedobjects/sources.(*Subid_info).Prepare_subid_logic(0xc019292f80,
> 0x2)
> >
> > Given that we can't reproduce it, what's the logical way to debug this
> and find out what's happening?
>
> The first thing to try is running your program under the race detector.
>
> Ian
>
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