Runtime error on mac

[praad]

fatal error: unexpected signal during runtime execution [signal 0xb code=0x1 addr=0x6f98e254ea9 pc=0x1df19]

runtime stack: runtime.throw(0x13e800, 0x2a) /usr/local/go/src/runtime/panic.go:527 +0x90 runtime.sigpanic() /usr/local/go/src/runtime/sigpanic_unix.go:12 +0x5a runtime.(*gcWork).put(0xc82001c720, 0xc820494060) /usr/local/go/src/runtime/mgcwork.go:87 +0x49 runtime.greyobject(0xc820494060, 0x0, 0x0, 0xc81ffdb5fc, 0x0, 0x3c0500, 0xc82001c720) /usr/local/go/src/runtime/mgcmark.go:1015 +0x2f1 runtime.shade(0xc820494060) /usr/local/go/src/runtime/mgcmark.go:953 +0x9a runtime.gcmarkwb_m(0xc8200001d8, 0xc820494060) /usr/local/go/src/runtime/mbarrier.go:91 +0xc1 runtime.writebarrierptr_nostore1.func1() /usr/local/go/src/runtime/mbarrier.go:117 +0x134 runtime.systemstack(0xc82003ddd8) /usr/local/go/src/runtime/asm_amd64.s:278 +0xab runtime.writebarrierptr_nostore1(0xc8200001d8, 0xc820494060) /usr/local/go/src/runtime/mbarrier.go:118 +0x71 runtime.writebarrierptr_nostore(0xc8200001d8, 0xc820494060) /usr/local/go/src/runtime/mbarrier.go:150 +0x47 runtime.newstack() /usr/local/go/src/runtime/stack1.go:760 +0x8d9 runtime.morestack() /usr/local/go/src/runtime/asm_amd64.s:330 +0x7f

goroutine 1 [stack growth]: bytes.makeCutsetFunc.func1(0x0, 0x1) /usr/local/go/src/bytes/bytes.go:572 fp=0xc820041b18 sp=0xc820041b10 bytes.lastIndexFunc(0xc8204bc119, 0x1000, 0x1000, 0xc820494060, 0xc8204bc100, 0x1000) /usr/local/go/src/bytes/bytes.go:564 +0xb3 fp=0xc820041b68 sp=0xc820041b18 bytes.TrimRightFunc(0xc8204bc119, 0x1000, 0x1000, 0xc820494060, 0x0, 0x0, 0x0) /usr/local/go/src/bytes/bytes.go:487 +0x5f fp=0xc820041bc0 sp=0xc820041b68 bytes.TrimFunc(0xc8204bc119, 0x1000, 0x1000, 0xc820494060, 0x0, 0x0, 0x0) /usr/local/go/src/bytes/bytes.go:500 +0x95 fp=0xc820041c18 sp=0xc820041bc0 bytes.Trim(0xc8204bc119, 0x1000, 0x1000, 0x117eb8, 0x1, 0x0, 0x0, 0x0) /usr/local/go/src/bytes/bytes.go:585 +0x68 fp=0xc820041c58 sp=0xc820041c18 github.com/yani-/wpress.Reader.Extract(0x7ffeefbffc8b, 0xb, 0xc82002e028, 0x8a, 0x0, 0x0, 0x0) /Users/abdullahirfan/go/src/github.com/yani-/wpress/reader.go:102 +0x3fb fp=0xc820041e60 sp=0xc820041c58 main.main() /Users/abdullahirfan/godev/wpress_extractor.go:16 +0x193 fp=0xc820041f50 sp=0xc820041e60 runtime.main() /usr/local/go/src/runtime/proc.go:111 +0x2b0 fp=0xc820041fa0 sp=0xc820041f50 runtime.goexit() /usr/local/go/src/runtime/asm_amd64.s:1721 +0x1 fp=0xc820041fa8 sp=0xc820041fa0