Initial commit

README.md

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+# go-issue-24993
+
+This repository is a reduced repro case for https://github.com/golang/go/issues/24993.
+
+But, I've found that this seems to also trigger https://github.com/golang/go/issues/26243.
+
+Just use go tip and `go run main.go`.
+
+Sometimes it panics with a stack trace like
+
+```
+runtime: pointer 0xc000410000 to unallocated span span.base()=0xc000410000 span.limit=0xc000412000 span.state=3
+runtime: found in object at *(0xc0002da540+0x10)
+object=0xc0002da540 s.base()=0xc0002da000 s.limit=0xc0002dbfe0 s.spanclass=14 s.elemsize=96 s.state=mSpanInUse
+ *(object+0) = 0x0
+ *(object+8) = 0x10
+ *(object+16) = 0xc000410000 <==
+ *(object+24) = 0x100000010
+ *(object+32) = 0x16d7800
+ *(object+40) = 0x0
+ *(object+48) = 0x0
+ *(object+56) = 0x0
+ *(object+64) = 0x0
+ *(object+72) = 0x0
+ *(object+80) = 0x0
+ *(object+88) = 0x0
+fatal error: found bad pointer in Go heap (incorrect use of unsafe or cgo?)
+
+runtime stack:
+runtime.throw(0x17a481e, 0x3e)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/panic.go:617 +0x72 fp=0x70000fad3d08 sp=0x70000fad3cd8 pc=0x102d892
+runtime.findObject(0xc000410000, 0xc0002da540, 0x10, 0xd150, 0x2812800, 0xc000049c70)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mbitmap.go:397 +0x3b4 fp=0x70000fad3d58 sp=0x70000fad3d08 pc=0x1015c44
+runtime.scanobject(0xc0002da540, 0xc000049c70)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mgcmark.go:1161 +0x216 fp=0x70000fad3de8 sp=0x70000fad3d58 pc=0x1021326
+runtime.gcDrain(0xc000049c70, 0x3)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mgcmark.go:919 +0x217 fp=0x70000fad3e40 sp=0x70000fad3de8 pc=0x1020b37
+runtime.gcBgMarkWorker.func2()
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mgc.go:1873 +0x80 fp=0x70000fad3e80 sp=0x70000fad3e40 pc=0x1054f20
+runtime.systemstack(0x4c00000)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/asm_amd64.s:351 +0x66 fp=0x70000fad3e88 sp=0x70000fad3e80 pc=0x1056ee6
+runtime.mstart()
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/proc.go:1153 fp=0x70000fad3e90 sp=0x70000fad3e88 pc=0x1031db0
+
+...
+```
+
+And other times it fails with a stack trace like:
+
+```
+runtime: nelems=85 nalloc=14 previous allocCount=13 nfreed=65535
+fatal error: sweep increased allocation count
+
+goroutine 3 [running]:
+runtime.throw(0x179837f, 0x20)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/panic.go:617 +0x72 fp=0xc000057668 sp=0xc000057638 pc=0x102d892
+runtime.(*mspan).sweep(0x2683010, 0xc000080000, 0x1054400)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mgcsweep.go:326 +0x84b fp=0xc000057740 sp=0xc000057668 pc=0x10236fb
+runtime.sweepone(0x17acc00)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mgcsweep.go:136 +0x26d fp=0xc0000577a8 sp=0xc000057740 pc=0x1022c5d
+runtime.bgsweep(0xc000080000)
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mgcsweep.go:73 +0xb8 fp=0xc0000577d8 sp=0xc0000577a8 pc=0x1022948
+runtime.goexit()
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc0000577e0 sp=0xc0000577d8 pc=0x1058f21
+created by runtime.gcenable
+	/Users/mr/gotip/src/github.com/golang/go/src/runtime/mgc.go:208 +0x58
+
+...
+```
+
+I've reproduced this with `go version devel +49abcf1a97 Thu Dec 20 09:04:35 2018 +0000 darwin/amd64`.

go.mod

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+module github.com/mark-rushakoff/go-issue-24993
+
+go 1.12
+
+require (
+	github.com/gogo/protobuf v1.2.0 // indirect
+	github.com/influxdata/influxdb v0.0.0-20181220221034-7db3db278bfa
+	github.com/influxdata/platform v0.0.0-20181220230935-ff0d2110ba96 // indirect
+	github.com/influxdata/roaring v0.4.12 // indirect
+	github.com/xlab/treeprint v0.0.0-20181112141820-a009c3971eca // indirect
+	golang.org/x/sync v0.0.0-20181108010431-42b317875d0f // indirect
+	golang.org/x/time v0.0.0-20181108054448-85acf8d2951c // indirect
+)