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cmd/go: go get -u: panic: runtime error: slice bounds out of range #16167

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SpComb opened this issue Jun 23, 2016 · 6 comments
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cmd/go: go get -u: panic: runtime error: slice bounds out of range #16167

SpComb opened this issue Jun 23, 2016 · 6 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.8

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@SpComb
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SpComb commented Jun 23, 2016 •
edited
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  1. What version of Go are you using (go version)?

    This also happens with go 1.6: cmd/go: go get panic: runtime error: slice bounds out of range #14826 (comment)

    Verified against git master, but using a custom binary patched to workaround cmd/go: go 1.7 get does not clone git submodules #16165 with go 1.7 beta, which breaks git submodule clones. The issue above contains the complete diff that I used.

    go version devel +aa6345d Thu Jun 23 04:31:19 2016 +0000 linux/amd64

  2. What operating system and processor architecture are you using (go env)?

    GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/root/go"
GORACE=""
GOROOT="/root/src/go"
GOTOOLDIR="/root/src/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build329298084=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"

  3. What did you do?

    Run go get -u against a repo that is missing some git submodules:

    $ /root/src/go/bin/go get -v -u github.com/qmsk/e2/cmd/tally
github.com/qmsk/e2 (download)
github.com/jessevdk/go-flags (download)
github.com/golang/glog (download)
github.com/jessevdk/go-flags
github.com/qmsk/e2/discovery
github.com/golang/glog
github.com/qmsk/e2/client
github.com/qmsk/e2/vendor/github.com/kidoman/embd
github.com/qmsk/e2/vendor/github.com/kidoman/embd/host/generic
github.com/qmsk/e2/vendor/github.com/kidoman/embd/host/rpi
github.com/qmsk/e2/tally
github.com/qmsk/e2/cmd/tally
$ cat src/github.com/qmsk/e2/.gitmodules 
[submodule "vendor/github.com/kidoman/embd"]
    path = vendor/github.com/kidoman/embd
    url = git@github.com:SpComb/embd.git
    branch = digitalpin-exported
$ rm -rf src/github.com/qmsk/e2/vendor/github.com/kidoman/embd/

    The original scenario for this was running the initial go get with missing SSH keys, causing the submodule clone to fail, and then re-running go get -u to fetch the missing submodules.

  4. What did you expect to see?

    I would expect go get to clone the missing submodules.

  5. What did you see instead?

    Go get panics, after succesfully cloning the missing vendor submodule:

    $ /root/src/go/bin/go get -v -u github.com/qmsk/e2/cmd/tally
github.com/qmsk/e2 (download)
github.com/jessevdk/go-flags (download)
github.com/kidoman/embd (download)
github.com/golang/glog (download)
panic: runtime error: slice bounds out of range

goroutine 1 [running]:
panic(0x7dd7a0, 0xc420010120)
    /root/src/go/src/runtime/panic.go:500 +0x1a1
main.vendoredImportPath(0xc4200b7680, 0xc420292de1, 0x24, 0x3, 0x0)
    /root/src/go/src/cmd/go/pkg.go:463 +0x668
main.loadImport(0xc420292de1, 0x24, 0xc420145180, 0x47, 0xc4200b7680, 0xc42044f9f8, 0xc420292ed0, 0x1, 0x1, 0x1, ...)
    /root/src/go/src/cmd/go/pkg.go:333 +0x9ea
main.(*Package).load(0xc4200b7680, 0xc42044f9f8, 0xc4202b8000, 0x0, 0x0, 0x4)
    /root/src/go/src/cmd/go/pkg.go:940 +0x12a5
main.loadImport(0xc4203178c1, 0x20, 0xc420316f90, 0x25, 0xc4204f6900, 0xc42044f9f8, 0xc420317a10, 0x1, 0x1, 0x1, ...)
    /root/src/go/src/cmd/go/pkg.go:374 +0x470
main.(*Package).load(0xc4204f6900, 0xc42044f9f8, 0xc420482380, 0x0, 0x0, 0x4)
    /root/src/go/src/cmd/go/pkg.go:940 +0x12a5
main.loadImport(0xc42036b3e1, 0x18, 0xc420287a10, 0x29, 0xc42011bb00, 0xc42044f9f8, 0xc42028c1e0, 0x1, 0x1, 0x1, ...)
    /root/src/go/src/cmd/go/pkg.go:374 +0x470
main.(*Package).load(0xc42011bb00, 0xc42044f9f8, 0xc4201c6a80, 0x0, 0x0, 0xc)
    /root/src/go/src/cmd/go/pkg.go:940 +0x12a5
main.loadImport(0x7fff6d41d82d, 0x1c, 0xc420010054, 0x8, 0x0, 0xc42044f9f8, 0x0, 0x0, 0x0, 0x0, ...)
    /root/src/go/src/cmd/go/pkg.go:374 +0x470
main.loadPackage(0x7fff6d41d82d, 0x1c, 0xc42044f9f8, 0x0)
    /root/src/go/src/cmd/go/pkg.go:1658 +0x28f
main.packagesAndErrors(0xc4203969a0, 0x1, 0x1, 0xc420396980, 0x1c, 0x8444ad)
    /root/src/go/src/cmd/go/pkg.go:1703 +0x329
main.packagesForBuild(0xc420396980, 0x1, 0x1, 0xc420396980, 0x1, 0x1)
    /root/src/go/src/cmd/go/pkg.go:1719 +0x75
main.runGet(0xa20d40, 0xc420396980, 0x1, 0x1)
    /root/src/go/src/cmd/go/get.go:131 +0x318
main.main()
    /root/src/go/src/cmd/go/main.go:181 +0x624

$ ls -la src/github.com/qmsk/e2/vendor/github.com/kidoman/embd/
total 120
drwxr-xr-x 1 root root   650 Jun 23 13:50 .
drwxr-xr-x 1 root root     8 Jun 23 13:50 ..
-rw-r--r-- 1 root root   153 Jun 23 13:50 AUTHORS
-rw-r--r-- 1 root root  1441 Jun 23 13:50 CONTRIBUTING.md
-rw-r--r-- 1 root root   288 Jun 23 13:50 CONTRIBUTORS
    ....
@SpComb SpComb changed the title panic: runtime error: slice bounds out of rangego get -u: go get -u: panic: runtime error: slice bounds out of range Jun 23, 2016
@bradfitz bradfitz changed the title go get -u: panic: runtime error: slice bounds out of range cmd/go: go get -u: panic: runtime error: slice bounds out of range Jun 23, 2016
@bradfitz bradfitz modified the milestones: Go1.7Maybe, Go1.8 Jun 23, 2016
@bradfitz
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Can you make this crash without changes to cmd/go? Otherwise this bug report can be read as "if I modify the cmd/go binary, I can make it crash", which is less compelling of a bug report than if you can crash it unmodified.

@SpComb
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SpComb commented Jun 23, 2016 •
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The exact same repro steps work with an unmodified go 1.6.1 binary, and it panics.

It does not crash with an unmodified go 1.7 beta binary, but it does not clone the vendor submodules either.

@quentinmit quentinmit added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 6, 2016
@quentinmit
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I am able to reproduce the panic with current HEAD.

@quentinmit quentinmit mentioned this issue Oct 6, 2016
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@tsaikd tsaikd mentioned this issue Oct 20, 2016
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@rsc
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rsc commented Oct 21, 2016

I can't reproduce this. I'm trying:

rm -rf /tmp/zz
GOPATH=/tmp/zz go get -v -u github.com/qmsk/e2/cmd/tally
cat /tmp/zz/src/github.com/qmsk/e2/.gitmodules 
rm -rf /tmp/zz/src/github.com/qmsk/e2/vendor/github.com/kidoman/embd/
GOPATH=/tmp/zz go get -v -u github.com/qmsk/e2/cmd/tally

and I get:

$ rm -rf /tmp/zz
$ GOPATH=/tmp/zz go get -v -u github.com/qmsk/e2/cmd/tally
github.com/qmsk/e2 (download)
cat /tmp/zz/src/github.com/qmsk/e2/.gitmodules 
github.com/jessevdk/go-flags (download)
github.com/kr/pretty (download)
github.com/kr/text (download)
Fetching https://golang.org/x/net/websocket?go-get=1
Parsing meta tags from https://golang.org/x/net/websocket?go-get=1 (status code 200)
get "golang.org/x/net/websocket": found meta tag main.metaImport{Prefix:"golang.org/x/net", VCS:"git", RepoRoot:"https://go.googlesource.com/net"} at https://golang.org/x/net/websocket?go-get=1
get "golang.org/x/net/websocket": verifying non-authoritative meta tag
Fetching https://golang.org/x/net?go-get=1
Parsing meta tags from https://golang.org/x/net?go-get=1 (status code 200)
golang.org/x/net (download)
github.com/jessevdk/go-flags
github.com/kr/text
github.com/qmsk/e2/discovery
golang.org/x/net/websocket
github.com/kr/pretty
github.com/qmsk/e2/client
github.com/qmsk/e2/web
github.com/qmsk/e2/tally
github.com/qmsk/e2/universe
github.com/qmsk/e2/cmd/tally
$ cat /tmp/zz/src/github.com/qmsk/e2/.gitmodules 
[submodule "vendor/github.com/kidoman/embd"]
    path = vendor/github.com/kidoman/embd
    url = https://github.com/SpComb/embd.git
    branch = digitalpin-exported
$ rm -rf /tmp/zz/src/github.com/qmsk/e2/vendor/github.com/kidoman/embd/
$ GOPATH=/tmp/zz go get -v -u github.com/qmsk/e2/cmd/tally
github.com/qmsk/e2 (download)
github.com/jessevdk/go-flags (download)
github.com/kr/pretty (download)
github.com/kr/text (download)
Fetching https://golang.org/x/net/websocket?go-get=1
Parsing meta tags from https://golang.org/x/net/websocket?go-get=1 (status code 200)
get "golang.org/x/net/websocket": found meta tag main.metaImport{Prefix:"golang.org/x/net", VCS:"git", RepoRoot:"https://go.googlesource.com/net"} at https://golang.org/x/net/websocket?go-get=1
get "golang.org/x/net/websocket": verifying non-authoritative meta tag
Fetching https://golang.org/x/net?go-get=1
Parsing meta tags from https://golang.org/x/net?go-get=1 (status code 200)
golang.org/x/net (download)
$

I've tried go1.6, go1.7, and current master. What am I doing wrong?

@rsc
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rsc commented Oct 21, 2016

I did get #15201 to reproduce though. Maybe that's enough.

@gopherbot
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CL https://golang.org/cl/31665 mentions this issue.

@golang golang locked and limited conversation to collaborators Oct 24, 2017
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@bradfitz @rsc @quentinmit @SpComb @gopherbot