cmd/compile: unexpected fault address while compiling #77605
Description
Go version
go1.26 linux/arm64
Output of go env in your module/workspace:
Information not available, unfortunately.
However:
- Host was a Linux AMD64 machine
- It was running `docker build --platform=linux/arm64` with base image `golang:1.26.0-alpine`
- The program is pure Go, compiled with `CGO_ENABLED=0`:
RUN --mount=type=ssh CGO_ENABLED=0 go build -o /go/bin/myprogramWhat did you do?
We ran two different docker builds where the Dockerfile attempts to compile a pure Go program using Go 1.26.
Relevant parts:
The following command were run on a Linux AMD64 host.
docker build \
--ssh default \
--platform=linux/arm64 \
-f path/to/foo/Dockerfile \
.
docker build \
--ssh default \
--platform=linux/arm64,linux/amd64 \
-f path/to/bar/Dockerfile \
.
Both Dockerfiles contained:
FROM golang:1.26.0-alpine AS build
RUN apk add --no-cache --upgrade git openssh-client && \
mkdir -p -m 0700 ~/.ssh && ssh-keyscan github.com >> ~/.ssh/known_hosts && \
git config --global url."git@github.com:".insteadOf "https://github.com/"
ENV GOPRIVATE=github.com/myorg/*
RUN --mount=type=ssh CGO_ENABLED=0 GOOS=linux go build \
-o /go/bin/foo github.com/import/path/of/foo
# ...
What did you see happen?
Compilation failed for both Dockerfiles with:
unexpected fault address 0xffffffffff895000
fatal error: fault
[signal SIGSEGV: segmentation violation code=0x1 addr=0xffffffffff895000 pc=0x282458]
(Address is indeed '0xffffffffff895000' for both.)
Additional details:
- The cache was entirely empty.
- Both builds failed on the same program (the two Dockerfiles have a shared program)
- The program they failed on is 329 lines long, with only 169 lines of code.
- This was all inside a Go workspace.
The full stack traces are rather large.
Here are the first few lines of both:
unexpected fault address 0xffffffffff895000
fatal error: fault
[signal SIGSEGV: segmentation violation code=0x1 addr=0xffffffffff895000 pc=0x282458]
goroutine 14 gp=0x5b3b50845a0 m=8 mp=0x5b3b5080008 [running]:
runtime.throw({0x6f0394?, 0x75ff90?})
runtime/panic.go:1229 +0x38 fp=0x5b3b54d9c60 sp=0x5b3b54d9c30 pc=0x93918
runtime.sigpanic()
runtime/signal_unix.go:945 +0x21c fp=0x5b3b54d9cc0 sp=0x5b3b54d9c60 pc=0x95e3c
net.(*sysDialer).dialTCP(0xca6151?, {0x75ff90?, 0x5b3b4bf6a50?}, 0x266780?, 0x5b3b54d9d58?)
net/tcpsock_posix.go:66 +0x78 fp=0x5b3b54d9d10 sp=0x5b3b54d9cd0 pc=0x282458
net.(*sysDialer).dialSingle(0x5b3b5c18000, {0x75ff90, 0x5b3b4bf6a50}, {0x75beb8, 0x5b3b551d770})
net/dial.go:791 +0x2c4 fp=0x5b3b54d9de0 sp=0x5b3b54d9d10 pc=0x268e64
net.(*sysDialer).dialSerial(0x5b3b5c18000, {0x75ff90, 0x5b3b4bf6a50}, {0x5b3b58c00c0?, 0x1, 0x262ec8?})
net/dial.go:756 +0x1a0 fp=0x5b3b54d9ef0 sp=0x5b3b54d9de0 pc=0x2688a0
net.(*sysDialer).dialParallel.func1({0x75ff90?, 0x5b3b4bf6a50?}, 0x1)
net/dial.go:676 +0x64 fp=0x5b3b54d9fa0 sp=0x5b3b54d9ef0 pc=0x268614
net.(*sysDialer).dialParallel.gowrap2()
net/dial.go:691 +0x2c fp=0x5b3b54d9fd0 sp=0x5b3b54d9fa0 pc=0x26858c
runtime.goexit({})
runtime/asm_arm64.s:1447 +0x4 fp=0x5b3b54d9fd0 sp=0x5b3b54d9fd0 pc=0x9b294
created by net.(*sysDialer).dialParallel in goroutine 123
net/dial.go:691 +0x1bc
unexpected fault address 0xffffffffff895000
unexpected fault address 0xffffffffff895000
unexpected fault address 0xffffffffff895000
fatal error: unexpected fault address 0x56e5
fatal error: fatal error: fatal error: unexpected fault address 0xffffffffff895000
fatal error: unexpected fault address 0xffffffffff895000
fatal error: fatal error: sync: inconsistent mutex statefault
fault
fault
fault
unexpected fault address 0xffffffffff895000
fatal error: fault
fault
fault
[signal SIGSEGV: segmentation violation code=0x1 addr=0xffffffffff895000 pc=0x152a28]
goroutine 103 gp=0x8a852205860 m=14 mp=0x8a852081008 [running]:
runtime.throw({0x6f0394?, 0x19?})
runtime/panic.go:1229 +0x38 fp=0x8a8525fcc70 sp=0x8a8525fcc40 pc=0x93918
runtime.sigpanic()
runtime/signal_unix.go:945 +0x21c fp=0x8a8525fccd0 sp=0x8a8525fcc70 pc=0x95e3c
go/scanner.ErrorList.Less(...)
go/scanner/errors.go:50
go/scanner.(*ErrorList).Less(0x8a8525fcd78?, 0x33d30?, 0xca7820?)
<autogenerated>:1 +0x28 fp=0x8a8525fcd40 sp=0x8a8525fcce0 pc=0x152a28
sort.order2(...)
sort/zsortinterface.go:299
sort.median({0x75ed90, 0x8a8522ca018}, 0x1b9c995d1b9a4bd7, 0x1b9c995d1b9a4bd8, 0x1b9c995d1b9a4bd9, 0x8a8525fcdc8)
sort/zsortinterface.go:308 +0x40 fp=0x8a8525fcd80 sp=0x8a8525fcd40 pc=0x14f0c0
sort.medianAdjacent(...)
sort/zsortinterface.go:316
sort.choosePivot({0x75ed90, 0x8a8522ca018}, 0x5500a15e00?, 0x18?)
sort/zsortinterface.go:279 +0x9c fp=0x8a8525fce10 sp=0x8a8525fcd80 pc=0x14efac
sort.pdqsort({0x75ed90, 0x8a8522ca018}, 0x18?, 0x609140?, 0x8a852c22001?)
sort/zsortinterface.go:89 +0x94 fp=0x8a8525fcea0 sp=0x8a8525fce10 pc=0x14e634
sort.Sort({0x75ed90, 0x8a8522ca018})
sort/sort.go:56 +0x60 fp=0x8a8525fcee0 sp=0x8a8525fcea0 pc=0x14d260
go/scanner.ErrorList.Sort(...)
go/scanner/errors.go:71
go/parser.ParseFile.func1()
go/parser/interface.go:125 +0x2a4 fp=0x8a8525fcfe0 sp=0x8a8525fcee0 pc=0x1980c4
go/parser.ParseFile(0x8a8524e60c0, {0x8a8525d5240, 0x39}, {0x5f5cc0?, 0x8a8522ca000?}, 0x6)
go/parser/interface.go:133 +0x118 fp=0x8a8525fd0a0 sp=0x8a8525fcfe0 pc=0x197da8
cmd/go/internal/modindex.readGoInfo({0x758da0?, 0x8a852340020?}, 0x8a8525e1c80)
Full traces attached below:
- trace-small.txt: small trace, only one fault.
- trace-long-multiple-faults.txt: longer trace, multiple faults encountered
What did you expect to see?
go build should not encounter a runtime fault.