What version of Go are you using (go version)?
$ go version
go version go1.18.3 windows/amd64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env
0 [main] cc1 (16504) C:\msys64\usr\lib\gcc\x86_64-pc-msys\11.3.0\cc1.exe: *** fatal error - cygheap base mismatch detected - 0x18034B408/0x18034C408.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version. The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution. Rebooting is also suggested if you
are unable to find another cygwin DLL.
1 [main] cc1 (16456) C:\msys64\usr\lib\gcc\x86_64-pc-msys\11.3.0\cc1.exe: *** fatal error - cygheap base mismatch detected - 0x18034B408/0x18034C408.
This problem is probably due to using incompatible versions of the cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version. The most recent version *should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution. Rebooting is also suggested if you
are unable to find another cygwin DLL.
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\nd\AppData\Local\go-build
set GOENV=C:\Users\nd\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\nd\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\nd\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=c:\Users\nd\go\go1.18.3
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=c:\Users\nd\go\go1.18.3\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.18.3
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\nd\w\go-projects\gofuzztutorial\go.mod
set GOWORK=
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\nd\AppData\Local\Temp\go-build3120891309=/tmp/go-build -gno-record-gcc-switches
What did you do?
Went through go fuzz tutorial: go.mod, main.go, main_test.go. Compiled the test:
go.exe test -c -o test.exe -gcflags "all=-N -l -d=libfuzzer" gofuzztutorial
and ran it with delve:
C:\w\idea\build\dlv\dlv\windows\dlv.exe exec test.exe -- -test.v -test.paniconexit0 -test.fuzz ^\QFuzzReverse\E$ -test.fuzzcachedir C:\Users\nd\AppData\Local\Temp\GoLand\fuzz -test.run ^$
It looks like with libfuzzer enabled compiler produces wrong line numbers. E.g. if I run disass -l FuzzReverse in delve, I get:
main_test.go:8 0xbfa8c0 4c8d642488 lea r12, ptr [rsp-0x78]
main_test.go:8 0xbfa8c5 4d3b6610 cmp r12, qword ptr [r14+0x10]
main_test.go:8 0xbfa8c9 0f867e020000 jbe 0xbfab4d
main_test.go:8 0xbfa8cf 4881ecf8000000 sub rsp, 0xf8
main_test.go:8 0xbfa8d6 4889ac24f0000000 mov qword ptr [rsp+0xf0], rbp
main_test.go:8 0xbfa8de 488dac24f0000000 lea rbp, ptr [rsp+0xf0]
main_test.go:8 0xbfa8e6 4889842400010000 mov qword ptr [rsp+0x100], rax
main_test.go:19 0xbfa8ee 0fb60debe31b00 movzx ecx, byte ptr [internal/fuzz._counters+5536]
main_test.go:19 0xbfa8f5 ffc1 inc ecx
main_test.go:19 0xbfa8f7 880de3e31b00 mov byte ptr [internal/fuzz._counters+5536], cl
main_test.go:9 0xbfa8fd 440f11bc24c0000000 movups xmmword ptr [rsp+0xc0], xmm15
main_test.go:9 0xbfa906 440f11bc24d0000000 movups xmmword ptr [rsp+0xd0], xmm15
main_test.go:9 0xbfa90f 440f11bc24e0000000 movups xmmword ptr [rsp+0xe0], xmm15
main_test.go:9 0xbfa918 488d8c24c0000000 lea rcx, ptr [rsp+0xc0]
Three instructions on main_test.go:19 seem to have a wrong line. Same in disass -l FuzzReverse.func1:
main_test.go:13 0xbfa520 4c8da42478ffffff lea r12, ptr [rsp+0xffffff78]
main_test.go:13 0xbfa528 4d3b6610 cmp r12, qword ptr [r14+0x10]
main_test.go:13 0xbfa52c 0f8663030000 jbe 0xbfa895
main_test.go:13 0xbfa532 4881ec08010000 sub rsp, 0x108
main_test.go:13 0xbfa539 4889ac2400010000 mov qword ptr [rsp+0x100], rbp
main_test.go:13 0xbfa541 488dac2400010000 lea rbp, ptr [rsp+0x100]
main_test.go:13 0xbfa549 4889842410010000 mov qword ptr [rsp+0x110], rax
main_test.go:13 0xbfa551 48899c2418010000 mov qword ptr [rsp+0x118], rbx
main_test.go:13 0xbfa559 48898c2420010000 mov qword ptr [rsp+0x120], rcx
main.go:19 0xbfa561 0fb60d72e71b00 movzx ecx, byte ptr [internal/fuzz._counters+5530]
main.go:19 0xbfa568 ffc1 inc ecx
main.go:19 0xbfa56a 880d6ae71b00 mov byte ptr [internal/fuzz._counters+5530], cl
main_test.go:14 0xbfa570 488b842418010000 mov rax, qword ptr [rsp+0x118]
main_test.go:14 0xbfa578 488b9c2420010000 mov rbx, qword ptr [rsp+0x120]
main_test.go:14 0xbfa580 e8bbfdffff call $gofuzztutorial.Reverse
main_test.go:14 0xbfa585 4889842480000000 mov qword ptr [rsp+0x80], rax
main_test.go:14 0xbfa58d 48899c2488000000 mov qword ptr [rsp+0x88], rbx
main_test.go:15 0xbfa595 e8a6fdffff call $gofuzztutorial.Reverse
main_test.go:15 0xbfa59a 4889842490000000 mov qword ptr [rsp+0x90], rax
Here also the file is main.go instead of main_test.go.
As a result delve doesn't stop on breakpoints inside the function passed to f.Fuzz.
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (
go env)?go envOutput$ go env 0 [main] cc1 (16504) C:\msys64\usr\lib\gcc\x86_64-pc-msys\11.3.0\cc1.exe: *** fatal error - cygheap base mismatch detected - 0x18034B408/0x18034C408. This problem is probably due to using incompatible versions of the cygwin DLL. Search for cygwin1.dll using the Windows Start->Find/Search facility and delete all but the most recent version. The most recent version *should* reside in x:\cygwin\bin, where 'x' is the drive on which you have installed the cygwin distribution. Rebooting is also suggested if you are unable to find another cygwin DLL. 1 [main] cc1 (16456) C:\msys64\usr\lib\gcc\x86_64-pc-msys\11.3.0\cc1.exe: *** fatal error - cygheap base mismatch detected - 0x18034B408/0x18034C408. This problem is probably due to using incompatible versions of the cygwin DLL. Search for cygwin1.dll using the Windows Start->Find/Search facility and delete all but the most recent version. The most recent version *should* reside in x:\cygwin\bin, where 'x' is the drive on which you have installed the cygwin distribution. Rebooting is also suggested if you are unable to find another cygwin DLL. set GO111MODULE= set GOARCH=amd64 set GOBIN= set GOCACHE=C:\Users\nd\AppData\Local\go-build set GOENV=C:\Users\nd\AppData\Roaming\go\env set GOEXE=.exe set GOEXPERIMENT= set GOFLAGS= set GOHOSTARCH=amd64 set GOHOSTOS=windows set GOINSECURE= set GOMODCACHE=C:\Users\nd\go\pkg\mod set GONOPROXY= set GONOSUMDB= set GOOS=windows set GOPATH=C:\Users\nd\go set GOPRIVATE= set GOPROXY=https://proxy.golang.org,direct set GOROOT=c:\Users\nd\go\go1.18.3 set GOSUMDB=sum.golang.org set GOTMPDIR= set GOTOOLDIR=c:\Users\nd\go\go1.18.3\pkg\tool\windows_amd64 set GOVCS= set GOVERSION=go1.18.3 set GCCGO=gccgo set GOAMD64=v1 set AR=ar set CC=gcc set CXX=g++ set CGO_ENABLED=1 set GOMOD=C:\Users\nd\w\go-projects\gofuzztutorial\go.mod set GOWORK= set CGO_CFLAGS=-g -O2 set CGO_CPPFLAGS= set CGO_CXXFLAGS=-g -O2 set CGO_FFLAGS=-g -O2 set CGO_LDFLAGS=-g -O2 set PKG_CONFIG=pkg-config set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\nd\AppData\Local\Temp\go-build3120891309=/tmp/go-build -gno-record-gcc-switchesWhat did you do?
Went through go fuzz tutorial: go.mod, main.go, main_test.go. Compiled the test:
and ran it with delve:
It looks like with libfuzzer enabled compiler produces wrong line numbers. E.g. if I run
disass -l FuzzReversein delve, I get:Three instructions on main_test.go:19 seem to have a wrong line. Same in
disass -l FuzzReverse.func1:Here also the file is main.go instead of main_test.go.
As a result delve doesn't stop on breakpoints inside the function passed to
f.Fuzz.