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[Qemu-devel] [Bug 1696353] Re: golang binaries fail to start under linux


From: John Paul Adrian Glaubitz
Subject: [Qemu-devel] [Bug 1696353] Re: golang binaries fail to start under linux-user
Date: Sat, 16 Dec 2017 15:07:18 -0000

I just gave it a test with qemu-arm and Go binaries still crash for me,
albeit differently:

address@hidden:/# cat hello.go 
package main

import "fmt"

func main() {
    fmt.Println("hello world")
}
address@hidden:/# gccgo-7 hello.go -o hello
address@hidden:/# ./hello 
mmap errno 9
fatal error: mmap

runtime stack:
mmap errno 9
fatal error: mmap
panic during panic

runtime stack:
mmap errno 9
fatal error: mmap
stack trace unavailable
address@hidden:/#

Should I file a new bug report?

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https://bugs.launchpad.net/bugs/1696353

Title:
  golang binaries fail to start under linux-user

Status in QEMU:
  Won't Fix

Bug description:
  With current master golang binaries fail when run under linux-user,
  for example:

  address@hidden qemu]$ ./arm-linux-user/qemu-arm glide 
  runtime: failed to create new OS thread (have 2 already; errno=22)
  fatal error: newosproc

  runtime stack:
  runtime.throw(0x45f879, 0x9)
        /usr/lib/golang/src/runtime/panic.go:566 +0x78
  runtime.newosproc(0x1092c000, 0x1093bfe0)
        /usr/lib/golang/src/runtime/os_linux.go:160 +0x1b0
  runtime.newm(0x4ae1e8, 0x0)
        /usr/lib/golang/src/runtime/proc.go:1572 +0x12c
  runtime.main.func1()
        /usr/lib/golang/src/runtime/proc.go:126 +0x24
  runtime.systemstack(0x5ef900)
        /usr/lib/golang/src/runtime/asm_arm.s:247 +0x80
  runtime.mstart()
        /usr/lib/golang/src/runtime/proc.go:1079

  goroutine 1 [running]:
  runtime.systemstack_switch()
        /usr/lib/golang/src/runtime/asm_arm.s:192 +0x4 fp=0x109287ac 
sp=0x109287a8
  runtime.main()
        /usr/lib/golang/src/runtime/proc.go:127 +0x5c fp=0x109287d4 
sp=0x109287ac
  runtime.goexit()
        /usr/lib/golang/src/runtime/asm_arm.s:998 +0x4 fp=0x109287d4 
sp=0x109287d4

  The reason for this is that the golang runtime does not pass the
  CLONE_SYSVMEM flag to clone so the clone flags checks fail:

  https://github.com/golang/go/blob/master/src/runtime/os_linux.go#L155

  The attached patch allows golang binaries to start under linux-user.

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