Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

cmd/internal/obj/s390x: panic on assembling invalid FMA instruction #26700

Closed
smasher164 opened this issue Jul 30, 2018 · 2 comments
Closed

cmd/internal/obj/s390x: panic on assembling invalid FMA instruction #26700

smasher164 opened this issue Jul 30, 2018 · 2 comments
Labels
FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.12

Comments

@smasher164
Copy link
Member

smasher164 commented Jul 30, 2018 •
edited

What version of Go are you using (go version)?

Tested with 1.10, 1.11beta2, and master

Does this issue reproduce with the latest release?

Yes

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

GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/akhil/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/akhil/work"
GOPROXY=""
GORACE=""
GOROOT="/Users/akhil/Projects/go"
GOTMPDIR=""
GOTOOLDIR="/Users/akhil/Projects/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
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 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/13/_hxzb_513nv2zh71188hsczr0000gn/T/go-build504608614=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I tried to build the following files: GOOS=linux GOARCH=s390x go build

main.go

package main

func asm()

func main() {}

asm_s390x.s

#include "textflag.h"

TEXT ·asm(SB),NOSPLIT,$0
	FMADD F0, F1, F2, F3
	RET

What did you expect to see?

The following output is with master (52cc9e3)

# _/Users/akhil/testgo/s390xasm
asm: illegal combination FMADD FREG FREG FREG FREG
asm: prog: 00000 (/Users/akhil/testgo/s390xasm/asm_s390x.s:4)	FMADD	F0, F1, F2, F3

What did you see instead?

# _/Users/akhil/testgo/s390xasm
asm: illegal combination FMADD FREG FREG FREG FREG
asm: prog: 00000 (/Users/akhil/testgo/s390xasm/asm_s390x.s:4)	FMADD	F0, F1, F2, F3
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x6 pc=0x112109d]

goroutine 1 [running]:
cmd/internal/obj/s390x.(*ctxtz).asmout(0xc0000d7be8, 0xc00006f790, 0xc0000d7bd0)
	/Users/akhil/Projects/go/src/cmd/internal/obj/s390x/asmz.go:2615 +0x5d
cmd/internal/obj/s390x.spanz(0xc0000c6000, 0xc0000d0000, 0xc000040490)
	/Users/akhil/Projects/go/src/cmd/internal/obj/s390x/asmz.go:444 +0x145
cmd/internal/obj.Flushplist(0xc0000c6000, 0xc0000d7e60, 0xc000040490, 0x0, 0x0)
	/Users/akhil/Projects/go/src/cmd/internal/obj/plist.go:107 +0x6ab
main.main()
	/Users/akhil/Projects/go/src/cmd/asm/main.go:75 +0x6e9
@ianlancetaylor
Copy link
Contributor

CC @mundaym

@ianlancetaylor ianlancetaylor added the NeedsFix The path to resolution is known, but the work has not been done. label Aug 3, 2018
@ianlancetaylor ianlancetaylor added this to the Go1.12 milestone Aug 3, 2018
@gopherbot
Copy link

Change https://golang.org/cl/153177 mentions this issue: cmd/internal/obj/s390x: don't crash on invalid instruction

@golang golang locked and limited conversation to collaborators Dec 7, 2019
Sign up for free to subscribe to this conversation on GitHub. Already have an account? Sign in.
Assignees
No one assigned
Labels
FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Projects
None yet
Milestone
Go1.12
Development

No branches or pull requests
3 participants
@ianlancetaylor @gopherbot @smasher164