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


From: Nick Craig-Wood
Subject: [Qemu-devel] [Bug 1696353] Re: golang binaries fail to start under linux-user
Date: Thu, 13 Jul 2017 02:43:30 -0000

The go team have applied the above patch and I can confirm that it is
now working properly using go-tip. This means it will be fixed in go
1.10.

So if you recompile your go binary with go-tip or go 1.10 when it is
released, it will run fine under qemu-system-arm.

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

Title:
  golang binaries fail to start under linux-user

Status in QEMU:
  New

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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