Hello,
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?
Thanks!
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