Repository to reproduce golang compilation hang when using https://github.com/zonedb/zonedb package.

1. Install the package

   go get github.com/pokeroklife/golang-debug-issue

2. Checkout the go version:

   $ go version
   go version go1.13.4 linux/amd64

3. Try to build the repo:

   $ go build \
       -v \
       -o /tmp/___go_build_golang_debug_issue \
       -gcflags "all=-N -l" \
       $GOPATH/src/github.com/pokeroklife/golang-debug-issue/main.go

4. The build hangs on compilation stage. Now in other terminal send a SIGQUIT signal to the build process in order to generate a stack trace:

   pkill --signal SIGQUIT --full 'go build'

5. You should get a stack trace. Here we see that runtime_Semacquire function hangs for some reason.

   # github.com/zonedb/zonedb
   SIGQUIT: quit
   PC=0x45e461 m=0 sigcode=0
   
   goroutine 0 [idle]:
   runtime.futex(0x1596c28, 0x80, 0x0, 0x0, 0x0, 0x7fb409818ac0, 0x7fb409818a00, 0x7fb409818ac0, 0x7ffc39170db8, 0x40a76f, ...)
          /usr/local/go/src/runtime/sys_linux_amd64.s:535 +0x21
   runtime.futexsleep(0x1596c28, 0x7fb400000000, 0xffffffffffffffff)
          /usr/local/go/src/runtime/os_linux.go:44 +0x46
   runtime.notesleep(0x1596c28)
          /usr/local/go/src/runtime/lock_futex.go:151 +0x9f
   runtime.stopm()
          /usr/local/go/src/runtime/proc.go:1928 +0xc0
   runtime.findrunnable(0xc000026000, 0x0)
          /usr/local/go/src/runtime/proc.go:2391 +0x53f
   runtime.schedule()
          /usr/local/go/src/runtime/proc.go:2524 +0x2be
   runtime.park_m(0xc000000c00)
          /usr/local/go/src/runtime/proc.go:2610 +0x9d
   runtime.mcall(0x0)
          /usr/local/go/src/runtime/asm_amd64.s:318 +0x5b
   
   goroutine 1 [semacquire, 1 minutes]:
   sync.runtime_Semacquire(0xc004b60f28)
          /usr/local/go/src/runtime/sema.go:56 +0x42
   sync.(*WaitGroup).Wait(0xc004b60f20)
          /usr/local/go/src/sync/waitgroup.go:130 +0x64
   cmd/compile/internal/gc.compileFunctions()
          /usr/local/go/src/cmd/compile/internal/gc/pgen.go:373 +0x1ce
   cmd/compile/internal/gc.Main(0xe5bfe8)
          /usr/local/go/src/cmd/compile/internal/gc/main.go:695 +0x3241
   main.main()
          /usr/local/go/src/cmd/compile/main.go:51 +0xac
   
   goroutine 11 [runnable]:
   cmd/compile/internal/ssa.(*desiredState).addList(0xc008e91720, 0xffffff070002ac1d)
          /usr/local/go/src/cmd/compile/internal/ssa/regalloc.go:2578 +0x6b
   cmd/compile/internal/ssa.(*desiredState).merge(0xc008e91720, 0xc11edc1f20)
          /usr/local/go/src/cmd/compile/internal/ssa/regalloc.go:2638 +0x7d
   cmd/compile/internal/ssa.(*regAllocState).computeLive(0xc004c4a000)
          /usr/local/go/src/cmd/compile/internal/ssa/regalloc.go:2436 +0x158d
   cmd/compile/internal/ssa.(*regAllocState).init(0xc004c4a000, 0xc0003dfe40)
          /usr/local/go/src/cmd/compile/internal/ssa/regalloc.go:674 +0x6c1
   cmd/compile/internal/ssa.regalloc(0xc0003dfe40)
          /usr/local/go/src/cmd/compile/internal/ssa/regalloc.go:145 +0x4a
   cmd/compile/internal/ssa.Compile(0xc0003dfe40)
          /usr/local/go/src/cmd/compile/internal/ssa/compile.go:92 +0x994
   cmd/compile/internal/gc.buildssa(0xc0003df8c0, 0x3, 0x0)
          /usr/local/go/src/cmd/compile/internal/gc/ssa.go:289 +0xc0e
   cmd/compile/internal/gc.compileSSA(0xc0003df8c0, 0x3)
          /usr/local/go/src/cmd/compile/internal/gc/pgen.go:298 +0x4d
   cmd/compile/internal/gc.compileFunctions.func2(0xc004b8b3e0, 0xc004b60f20, 0x3)
          /usr/local/go/src/cmd/compile/internal/gc/pgen.go:363 +0x49
   created by cmd/compile/internal/gc.compileFunctions
          /usr/local/go/src/cmd/compile/internal/gc/pgen.go:361 +0x128
   
   rax    0xca
   rbx    0x1596ae0
   rcx    0x45e463
   rdx    0x0
   rdi    0x1596c28
   rsi    0x80
   rbp    0x7ffc39170d80
   rsp    0x7ffc39170d38
   r8     0x0
   r9     0x0
   r10    0x0
   r11    0x286
   r12    0x0
   r13    0x7fb415d15008
   r14    0x1
   r15    0x1
   rip    0x45e461
   rflags 0x286
   cs     0x33
   fs     0x0
   gs     0x0