Date: Mon, 26 May 2014 21:36:22 +1000 From: Peter Jeremy <peter@rulingia.com> To: Konstantin Belousov <kostikbel@gmail.com> Cc: freebsd-amd64@freebsd.org Subject: Re: i386 Go programs crash on amd64 Message-ID: <20140526113622.GB96083@server.rulingia.com> In-Reply-To: <20140524074101.GI74331@kib.kiev.ua> References: <20140523225300.GA14433@server.rulingia.com> <537FD853.3000505@wemm.org> <537FD9A2.2010607@wemm.org> <20140523233444.GH74331@kib.kiev.ua> <20140524033944.GA96083@server.rulingia.com> <20140524074101.GI74331@kib.kiev.ua>
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On 2014-May-24 10:41:01 +0300, Konstantin Belousov <kostikbel@gmail.com> wr=
ote:
>> >Provide the minimal test case.
>>=20
>> The following go program, compiled on i386 and run on amd64 will die
>> with a segmentation violation or bus error:
>> -------
>> package main
>>=20
>> import "fmt"
>>=20
>> func main() {
>> fmt.Println("Hello World")
>> }
>> -------
>No, this is not consumable.
>
>I need a self-contained minimal example written in C/asm.
Actually, I've found that
--------
package main
import "syscall"
func main() { syscall.Write(1, []byte("Hello World\n")) }
--------
also crashes ~66 syscalls after the first sysarch(2) call. That
reduces the binary to 520K (go reports this is 50K lines of assembler).
>If this is too hard to produce, give the the self-contained
>binary, again as small as possible (small by comparing the
>number of syscalls before the issue manifests itself).
I've uploaded the source, binary and disassembly to
freefall:~peterj/write{.go,,.S} (and verified it crashes).
If I get time, I'll see if I can strip some of the support code out of
Go to shrink it further.
--=20
Peter Jeremy
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