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net: net.Conn write panic on darwin amd64 #75216

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BugReportIssues describing a possible bug in the Go implementation. WaitingForInfoIssue is not actionable because of missing required information, which needs to be provided.
@Asutorufa

Description

Go version

go1.25.0 X:jsonv2,greenteagc darwin/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=''
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/home/asutorufa/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/home/asutorufa/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2311514801=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/home/asutorufa/Documents/Programming/yuhaiin/go.mod'
GOMODCACHE='/home/asutorufa/.local/storage/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/asutorufa/.local/storage/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/home/asutorufa/sdk/go1.25.0'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/asutorufa/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/home/asutorufa/sdk/go1.25.0/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.25.0'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

io.Copy on tls.Conn and net.Conn

What did you see happen?

panic: invalid return from write: got 33554436 from a write of 239
goroutine 278600 [running]:
internal/poll.(*FD).Write(0xc00467d000, {0xc001577c00, 0xef, 0x700})
	internal/poll/fd_unix.go:382 +0x534
net.(*netFD).Write(...)
	net/fd_posix.go:109
net.(*conn).Write(0xc000d7ad18, {0xc001577c00?, 0xc?, 0xc?})
	net/net.go:208 +0x48
crypto/tls.(*Conn).write(...)
	crypto/tls/conn.go:955
crypto/tls.(*Conn).writeRecordLocked(0xc00139f508, 0x17, {0xc00133d000, 0xd9, 0x1000})
	crypto/tls/conn.go:1036 +0x1507
crypto/tls.(*Conn).Write(0xd9?, {0xc00133d000, 0xd9, 0x1000})
	crypto/tls/conn.go:1255 +0x37e

What did you expect to see?

Normally write or return error, instead of panic.

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    BugReportIssues describing a possible bug in the Go implementation. WaitingForInfoIssue is not actionable because of missing required information, which needs to be provided.

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