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instruction: 0.664
other: 0.595
mistranslation: 0.563
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graphic: 0.530
assembly: 0.518
network: 0.507
vnc: 0.487
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socket: 0.415

cannot run golang app with docker, version 17.09.1-ce, disabling core 0 and qemu-arm, version 2.7.

Hello!
I figure out that sometimes simple go application is not working.
I am using docker + qemu-arm + go( for armv7l).

These are version info below.

root@VDBS1535:~# docker -v
Docker version 17.09.1-ce, build 19e2cf6

bash-3.2# qemu-arm --version
qemu-arm version 2.7.0, Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers

$ go version
go version go1.12.6 linux/arm
$ go env
GOARCH="arm"
GOBIN=""
GOCACHE="/home/quickbuild/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="arm"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/quickbuild/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/lib/golang"
GOTMPDIR=""
GOTOOLDIR="/usr/lib/golang/pkg/tool/linux_arm"
GCCGO="gccgo"
GOARM="7"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -marm -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build242285369=/tmp/go-build -gno-record-gcc-switches"

This issue is come only when I disable core 0 using a command below.
please check "--cpuset-cpus=1-55" option.

sudo docker run --privileged -d -i -t --cpuset-cpus=1-55 --mount type=bind,source="/home/dw83kim/mnt",destination="/mnt" --network host --name="ubuntu_core1" ubuntu:xenial-20200212


This is what I have tested in the environment above.

package main
func main(){
    for i:=0; i<1000; i++ {
        println("Hello world")
    }
}

This is one of the error logs have faced sometimes not always.

bash-3.2# go run test.go
fatal error: schedule: holding locks
panic during panic
SIGILL: illegal instruction
PC=0xc9ec4c m=3 sigcode=2

goroutine 122 [runnable]:
qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Segmentation fault (core dumped)
bash-3.2#

Please check it.
Thanks in advance.

This is a known and fixed bug in QEMU. Please try a more recent version than 2.7 (eg 4.2, which is the most recent release).


Could you retest with latest version (4.2.0) of QEMU?

LP:1696773 is the old bug that I think is probably the cause here, though 2.7 is old enough it has a bunch of other linux-user race condition bugs that we've since fixed.


Hello! Peter and Laurent,
Thanks for your kind & rapid reply.

It took long to merge the patch Peter mentioned.
After applying the patch the problem is gone but I found new issue.

When I had tried to test for the first time after making new docker container it took much longer time.


bash-3.2# time go run test.go
Hello world

real	5m3.516s
user	5m48.696s
sys	13m32.600s
bash-3.2# time go run test.go
Hello world

real	0m1.784s
user	0m2.339s
sys	0m1.742s
bash-3.2# time go run test.go
Hello world

real	0m1.881s
user	0m2.302s
sys	0m1.926s
bash-3.2# pwd

I believe that 5 min for just printing "Hello world" is not your expectation.

Is it also known issue?
Please check it.

Thanks.



The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting older bugs to "Incomplete" now.

If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.

Thank you and sorry for the inconvenience.


[Expired for QEMU because there has been no activity for 60 days.]