Bug: reflect: slice index out of range

[BenB196]

Following error can be thrown

panic: reflect: slice index out of range [recovered]
        panic: reflect: slice index out of range

goroutine 82 [running]:
encoding/json.(*encodeState).marshal.func1(0xc0049ef9e8)
        /usr/local/go/src/encoding/json/encode.go:305 +0x9a
panic(0x9c2ca0, 0xb7ee60)
        /usr/local/go/src/runtime/panic.go:679 +0x1b2
reflect.Value.Index(0x9b4b60, 0xc00000c080, 0x197, 0x27, 0xa20100, 0xc00025c720, 0x199)
        /usr/local/go/src/reflect/value.go:949 +0x1fe
encoding/json.arrayEncoder.encode(0xc000b9be60, 0xc0000ea070, 0x9b4b60, 0xc00000c080, 0x197, 0xc0049e0100)
        /usr/local/go/src/encoding/json/encode.go:791 +0x8d
encoding/json.sliceEncoder.encode(0xc0002e7710, 0xc0000ea070, 0x9b4b60, 0xc00000c080, 0x197, 0x4f0100)
        /usr/local/go/src/encoding/json/encode.go:765 +0x8f
encoding/json.ptrEncoder.encode(0xc0002e77a0, 0xc0000ea070, 0x99cd00, 0xc00000c080, 0x16, 0x990100)
        /usr/local/go/src/encoding/json/encode.go:810 +0xb1
encoding/json.(*encodeState).reflectValue(0xc0000ea070, 0x99cd00, 0xc00000c080, 0x16, 0x100)
        /usr/local/go/src/encoding/json/encode.go:337 +0x82
encoding/json.(*encodeState).marshal(0xc0000ea070, 0x99cd00, 0xc00000c080, 0x100, 0x0, 0x0)
        /usr/local/go/src/encoding/json/encode.go:309 +0x10b
encoding/json.Marshal(0x99cd00, 0xc00000c080, 0x1000, 0xc0013d0000, 0xc000532030, 0x0, 0x0)
        /usr/local/go/src/encoding/json/encode.go:161 +0x52
github.com/BenB196/crashplan-ffs-puller/eventOutput.WriteInProgressQueries(0xc00011cef0, 0xe, 0xc00011e5e0, 0x17, 0xc00011cf00, 0xf, 0xc00011cefe, 0x2, 0xc00011cf10, 0x3, ...)
        /app/eventOutput/fileHandler.go:279 +0x2fe
github.com/BenB196/crashplan-ffs-puller/ffsEvent.FFSQuery.func2(0xc00000c080, 0xc0004282d0, 0xc00000a1e0, 0xc000212780)
        /app/ffsEvent/ffsEvent.go:99 +0x23c
created by github.com/BenB196/crashplan-ffs-puller/ffsEvent.FFSQuery
        /app/ffsEvent/ffsEvent.go:91 +0x67d

[BenB196]

Not sure how to properly handle this.

[BenB196]

Hopefully fixed in release v0.1.9.

[BenB196]

Bug still not fixed

[BenB196]

Hopefully fixed in release v0.2.2

[lucbarr]

What was the root cause ?

[BenB196]

@lucbarr I was never able to track this fully down, however, I haven't seen it since upgrading to the newer versions of Go, so I'm guessing it was an issue it.

[didopimentel]

@BenB196 I think there are some race conditions bugs with the json.Marshal. Upgrading the Go version did not fix for me, but actually creating a mutex lock inside the MarshalJSON() method worked.

[didopimentel]

Did the same as this guy here

[BenB196]

Hmm, interesting, yeah, unfortunately this issue was opened a while ago, and since then, and the project has had some major changes to its logic. So I'm not sure what really fixed it for this project. Though, the mutex thing does make sense, if you are using json marshaling with a pointer as in theory the value could change midway through.

[TUTUBIG]

i got this error too

[TUTUBIG]

should not be a issue about data race. for i got this in a serialization process

panic here

[didopimentel]

@TUTUBIG where does this storageChan slice come from? I can't see the declaration inside the function. But I don't understand why your code settles that this shouldn't be a race condition issue.

[Ilak-0]

the same to my code,when using json marshal change struck to json. error msg is panic: runtime error: index out of range [16] with length 16 [recovered]

[MaShantao]

hello?? anyone has solve this issue??

[wqedggc]

i got this one......... why happened