runtime: SIGSEGV in mapaccess2_faststr

[whh32]

Go version

go1.24.0 linux_amd64

Output of go env in your module/workspace:

AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='on'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN='/root/go_source/bin'
GOCACHE='/root/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/root/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build4089494877=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/dev/null'
GOMODCACHE='/root/go_source/pkg/mod'
GOOS='linux'
GOPATH='/root/go_source'
GOPROXY='https://goproxy.cn,direct'
GOROOT='/root/tools/go1.24.0'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/root/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/root/tools/go1.24.0/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.0'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

When using a single goroutine to call a map, a panic occurs when accessing the contents of the map

What did you see happen?

unexpected fault address 0x7f5571e74e6f
fatal error: fault
[signal SIGSEGV: segmentation violation code=0x1 addr=0x7f5571e74e6f pc=0x4067d9]

goroutine 329 gp=0xc0009028c0 m=15 mp=0xc000481808 [running]:
runtime.throw({0x148d732?, 0x6e127487bfb8?})
/root/tools/go1.24.0/src/runtime/panic.go:1096 +0x48 fp=0xc5307ab1b0 sp=0xc5307ab180 pc=0x479ea8
runtime.sigpanic()
/root/tools/go1.24.0/src/runtime/signal_unix.go:939 +0x26c fp=0xc5307ab210 sp=0xc5307ab1b0 pc=0x47be2c
memeqbody()
/root/tools/go1.24.0/src/internal/bytealg/equal_amd64.s:115 +0xe9 fp=0xc5307ab218 sp=0xc5307ab210 pc=0x4067d9
runtime.mapaccess2_faststr(0x12e1860, 0xc82bd0bb30, {0xc004210420, 0x10})
/root/tools/go1.24.0/src/internal/runtime/maps/runtime_faststr_swiss.go:204 +0x215 fp=0xc5307ab298 sp=0xc5307ab218 pc=0x40c5f5

What did you expect to see?

Successfully returned data.

[prattmic]

Can you provide a small reproducer or show what your code is doing? Just the panic isn’t sufficient to help.

[gabyhelp]

Related Issues

• runtime: SIGSEGV in runtime.mapdelete_faststr #41170 (closed)
• maps: segfault in Clone #62203 (closed)
• go1.22.8 runtime error: SIGSEGV: segmentation violation #70194 (closed)
• runtime: runtime crashes, reproducer same as #20427 #36371 (closed)
• cmd/go: "fatal error: concurrent map writes" during go get #35317 (closed)
• runtime: map unexpected fault address #23279 (closed)
• runtime: invalid pointer found on stack regression in Go1.15 triggered by mapassign in init #41816 (closed)
• strange panic SIGSEGV inside lock_futex.go lock #32448 (closed)
• Map protected by mutex caused panic: concurrent map writes #20060 (closed)
• encoding/json: encode panic #55829 (closed)

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[whh32]

Sorry, I rechecked the program. The problem is our own making. Let me close this problem.