godebugs

package standard library

go1.25.6 Latest Latest Go to latest Published: Jan 15, 2026 License: BSD-3-Clause Imports: 0 Imported by: 0

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cs.opensource.google/go/go

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Documentation ¶

Overview ¶

Package godebugs provides a table of known GODEBUG settings, for use by a variety of other packages, including internal/godebug, runtime, runtime/metrics, and cmd/go/internal/load.

Index ¶

Constants ¶

This section is empty.

Variables ¶

View Source

var All = []Info{
	{Name: "allowmultiplevcs", Package: "cmd/go"},
	{Name: "asynctimerchan", Package: "time", Changed: 23, Old: "1"},
	{Name: "containermaxprocs", Package: "runtime", Changed: 25, Old: "0"},
	{Name: "dataindependenttiming", Package: "crypto/subtle", Opaque: true},
	{Name: "decoratemappings", Package: "runtime", Opaque: true, Changed: 25, Old: "0"},
	{Name: "embedfollowsymlinks", Package: "cmd/go"},
	{Name: "execerrdot", Package: "os/exec"},
	{Name: "fips140", Package: "crypto/fips140", Opaque: true, Immutable: true},
	{Name: "gocachehash", Package: "cmd/go"},
	{Name: "gocachetest", Package: "cmd/go"},
	{Name: "gocacheverify", Package: "cmd/go"},
	{Name: "gotestjsonbuildtext", Package: "cmd/go", Changed: 24, Old: "1"},
	{Name: "gotypesalias", Package: "go/types", Changed: 23, Old: "0"},
	{Name: "http2client", Package: "net/http"},
	{Name: "http2debug", Package: "net/http", Opaque: true},
	{Name: "http2server", Package: "net/http"},
	{Name: "httpcookiemaxnum", Package: "net/http", Changed: 24, Old: "0"},
	{Name: "httplaxcontentlength", Package: "net/http", Changed: 22, Old: "1"},
	{Name: "httpmuxgo121", Package: "net/http", Changed: 22, Old: "1"},
	{Name: "httpservecontentkeepheaders", Package: "net/http", Changed: 23, Old: "1"},
	{Name: "installgoroot", Package: "go/build"},
	{Name: "jstmpllitinterp", Package: "html/template", Opaque: true},

	{Name: "multipartmaxheaders", Package: "mime/multipart"},
	{Name: "multipartmaxparts", Package: "mime/multipart"},
	{Name: "multipathtcp", Package: "net", Changed: 24, Old: "0"},
	{Name: "netdns", Package: "net", Opaque: true},
	{Name: "netedns0", Package: "net", Changed: 19, Old: "0"},
	{Name: "panicnil", Package: "runtime", Changed: 21, Old: "1"},
	{Name: "randautoseed", Package: "math/rand"},
	{Name: "randseednop", Package: "math/rand", Changed: 24, Old: "0"},
	{Name: "rsa1024min", Package: "crypto/rsa", Changed: 24, Old: "0"},
	{Name: "tarinsecurepath", Package: "archive/tar"},
	{Name: "tls10server", Package: "crypto/tls", Changed: 22, Old: "1"},
	{Name: "tls3des", Package: "crypto/tls", Changed: 23, Old: "1"},
	{Name: "tlsmaxrsasize", Package: "crypto/tls"},
	{Name: "tlsmlkem", Package: "crypto/tls", Changed: 24, Old: "0", Opaque: true},
	{Name: "tlsrsakex", Package: "crypto/tls", Changed: 22, Old: "1"},
	{Name: "tlssha1", Package: "crypto/tls", Changed: 25, Old: "1"},
	{Name: "tlsunsafeekm", Package: "crypto/tls", Changed: 22, Old: "1"},
	{Name: "updatemaxprocs", Package: "runtime", Changed: 25, Old: "0"},
	{Name: "urlmaxqueryparams", Package: "net/url", Changed: 24, Old: "0"},
	{Name: "winreadlinkvolume", Package: "os", Changed: 23, Old: "0"},
	{Name: "winsymlink", Package: "os", Changed: 23, Old: "0"},
	{Name: "x509keypairleaf", Package: "crypto/tls", Changed: 23, Old: "0"},
	{Name: "x509negativeserial", Package: "crypto/x509", Changed: 23, Old: "1"},
	{Name: "x509rsacrt", Package: "crypto/x509", Changed: 24, Old: "0"},
	{Name: "x509sha256skid", Package: "crypto/x509", Changed: 25, Old: "0"},
	{Name: "x509usefallbackroots", Package: "crypto/x509"},
	{Name: "x509usepolicies", Package: "crypto/x509", Changed: 24, Old: "0"},
	{Name: "zipinsecurepath", Package: "archive/zip"},
}

All is the table of known settings, sorted by Name.

Note: After adding entries to this table, run 'go generate runtime/metrics' to update the runtime/metrics doc comment. (Otherwise the runtime/metrics test will fail.)

Note: After adding entries to this table, update the list in doc/godebug.md as well. (Otherwise the test in this package will fail.)

Functions ¶

This section is empty.

Types ¶

type Info ¶

type Info struct {
	Name      string // name of the setting ("panicnil")
	Package   string // package that uses the setting ("runtime")
	Changed   int    // minor version when default changed, if any; 21 means Go 1.21
	Old       string // value that restores behavior prior to Changed
	Opaque    bool   // setting does not export information to runtime/metrics using [internal/godebug.Setting.IncNonDefault]
	Immutable bool   // setting cannot be changed after program start
}

An Info describes a single known GODEBUG setting.

func Lookup ¶

func Lookup(name string) *Info

Lookup returns the Info with the given name.

Source Files ¶

View all Source files

table.go

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