[dev.simd] all: merge master (adce7f1) into dev.simd

Conflicts:

- src/internal/goexperiment/flags.go
- src/runtime/export_test.go

Merge List:

+ 2025-10-03 adce7f196e cmd/link: support .def file with MSVC clang toolchain
+ 2025-10-03 d5b950399d cmd/cgo: fix unaligned arguments typedmemmove crash on iOS
+ 2025-10-02 53845004d6 net/http/httputil: deprecate ReverseProxy.Director
+ 2025-10-02 bbdff9e8e1 net/http: update bundled x/net/http2 and delete obsolete http2inTests
+ 2025-10-02 4008e07080 io/fs: move path name documentation up to the package doc comment
+ 2025-10-02 0e4e2e6832 runtime: skip TestGoroutineLeakProfile under mayMoreStackPreempt
+ 2025-10-02 f03c392295 runtime: fix aix/ppc64 library initialization
+ 2025-10-02 707454b41f cmd/go: update `go help mod edit` with the tool and ignore sections
+ 2025-10-02 8c68a1c1ab runtime,net/http/pprof: goroutine leak detection by using the garbage collector
+ 2025-10-02 84db201ae1 cmd/compile: propagate len([]T{}) to make builtin to allow stack allocation
+ 2025-10-02 5799c139a7 crypto/tls: rm marshalEncryptedClientHelloConfigList dead code
+ 2025-10-01 633dd1d475 encoding/json: fix Decoder.InputOffset regression in goexperiment.jsonv2
+ 2025-10-01 8ad27fb656 doc/go_spec.html: update date
+ 2025-10-01 3f451f2c54 testing/synctest: fix inverted test failure message in TestContextAfterFunc
+ 2025-10-01 be0fed8a5f cmd/go/testdata/script/test_fuzz_fuzztime.txt: disable
+ 2025-09-30 eb1c7f6e69 runtime: move loong64 library entry point to os-agnostic file
+ 2025-09-30 c9257151e5 runtime: unify ppc64/ppc64le library entry point
+ 2025-09-30 4ff8a457db test/codegen: codify handling of floating point constants on arm64
+ 2025-09-30 fcb893fc4b cmd/compile/internal/ssa: remove redundant "type:" prefix check
+ 2025-09-30 19cc1022ba mime: reduce allocs incurred by ParseMediaType
+ 2025-09-30 08afc50bea mime: extend "builtinTypes" to include a more complete list of common types
+ 2025-09-30 97da068774 cmd/compile: eliminate nil checks on .dict arg
+ 2025-09-30 300d9d2714 runtime: initialise debug settings much earlier in startup process
+ 2025-09-30 a846bb0aa5 errors: add AsType
+ 2025-09-30 7c8166d02d cmd/link/internal/arm64: support Mach-O ARM64_RELOC_SUBTRACTOR in internal linking
+ 2025-09-30 6e95748335 cmd/link/internal/arm64: support Mach-O ARM64_RELOC_POINTER_TO_GOT in internal linking
+ 2025-09-30 742f92063e cmd/compile, runtime: always enable Wasm signext and satconv features
+ 2025-09-30 db10db6be3 internal/poll: remove operation fields from FD
+ 2025-09-29 75c87df58e internal/poll: pass the I/O mode instead of an overlapped object in execIO
+ 2025-09-29 fc88e18b4a crypto/internal/fips140/entropy: add CPU jitter-based entropy source
+ 2025-09-29 db4fade759 crypto/internal/fips140/mlkem: make CAST conditional
+ 2025-09-29 db3cb3fd9a runtime: correct reference to getStackMap in comment
+ 2025-09-29 690fc2fb05 internal/poll: remove buf field from operation
+ 2025-09-29 eaf2345256 cmd/link: use a .def file to mark exported symbols on Windows
+ 2025-09-29 4b77733565 internal/syscall/windows: regenerate GetFileSizeEx
+ 2025-09-29 4e9006a716 crypto/tls: quote protocols in ALPN error message
+ 2025-09-29 047c2ab841 cmd/link: don't pass -Wl,-S on Solaris
+ 2025-09-29 ae8eba071b cmd/link: use correct length for pcln.cutab
+ 2025-09-29 fe3ba74b9e cmd/link: skip TestFlagW on platforms without DWARF symbol table
+ 2025-09-29 d42d56b764 encoding/xml: make use of reflect.TypeAssert
+ 2025-09-29 6d51f93257 runtime: jump instead of branch in netbsd/arm64 entry point
+ 2025-09-28 5500cbf0e4 debug/elf: prevent offset overflow
+ 2025-09-27 34e67623a8 all:  fix typos
+ 2025-09-27 af6999e60d cmd/compile: implement jump table on loong64
+ 2025-09-26 63cd912083 os/user: simplify go:build
+ 2025-09-26 53009b26dd runtime: use a smaller arena size on Wasm
+ 2025-09-26 3a5df9d2b2 net/http: add HTTP2Config.StrictMaxConcurrentRequests
+ 2025-09-26 16be34df02 net/http: add more tests of transport connection pool
+ 2025-09-26 3e4540b49d os/user: use getgrouplist on illumos && cgo
+ 2025-09-26 15fbe3480b internal/poll: simplify WriteMsg and ReadMsg on Windows
+ 2025-09-26 16ae11a9e1 runtime: move TestReadMetricsSched to testprog
+ 2025-09-26 459f3a3adc cmd/link: don't pass -Wl,-S on AIX
+ 2025-09-26 4631a2d3c6 cmd/link: skip TestFlagW on AIX
+ 2025-09-26 0f31d742cd cmd/compile: fix ICE with new(<untyped expr>)
+ 2025-09-26 7d7cd6e07b internal/poll: don't call SetFilePointerEx in Seek for overlapped handles
+ 2025-09-26 41cba31e66 mime/multipart: percent-encode CR and LF in header values to avoid CRLF injection
+ 2025-09-26 dd1d597c3a Revert "cmd/internal/obj/loong64: use the MOVVP instruction to optimize prologue"
+ 2025-09-26 45d6bc76af runtime: unify arm64 entry point code
+ 2025-09-25 fdea7da3e6 runtime: use common library entry point on windows amd64/386
+ 2025-09-25 e8a4f508d1 lib/fips140: re-seal v1.0.0
+ 2025-09-25 9b7a328089 crypto/internal/fips140: remove key import PCTs, make keygen PCTs fatal
+ 2025-09-25 7f9ab7203f crypto/internal/fips140: update frozen module version to "v1.0.0"
+ 2025-09-25 fb5719cbda crypto/internal/fips140/ecdsa: make TestingOnlyNewDRBG generic
+ 2025-09-25 56067e31f2 std: remove unused declarations

Change-Id: Iecb28fd62c69fbed59da557f46d31bae55889e2c

1 files changed, 32 insertions, 8 deletions

diff --git a/src/runtime/proc.go b/src/runtime/proc.go
index 887063638b..38299d82c0 100644
--- a/src/runtime/proc.go
+++ b/src/runtime/proc.go
@@ -517,7 +517,7 @@ func acquireSudog() *sudog {
 	s := pp.sudogcache[n-1]
 	pp.sudogcache[n-1] = nil
 	pp.sudogcache = pp.sudogcache[:n-1]
-	if s.elem != nil {
+	if s.elem.get() != nil {
 		throw("acquireSudog: found s.elem != nil in cache")
 	}
 	releasem(mp)
@@ -526,7 +526,7 @@ func acquireSudog() *sudog {
 
 //go:nosplit
 func releaseSudog(s *sudog) {
-	if s.elem != nil {
+	if s.elem.get() != nil {
 		throw("runtime: sudog with non-nil elem")
 	}
 	if s.isSelect {
@@ -541,7 +541,7 @@ func releaseSudog(s *sudog) {
 	if s.waitlink != nil {
 		throw("runtime: sudog with non-nil waitlink")
 	}
-	if s.c != nil {
+	if s.c.get() != nil {
 		throw("runtime: sudog with non-nil c")
 	}
 	gp := getg()
@@ -790,7 +790,9 @@ func cpuinit(env string) {
 // getGodebugEarly extracts the environment variable GODEBUG from the environment on
 // Unix-like operating systems and returns it. This function exists to extract GODEBUG
 // early before much of the runtime is initialized.
-func getGodebugEarly() string {
+//
+// Returns nil, false if OS doesn't provide env vars early in the init sequence.
+func getGodebugEarly() (string, bool) {
 	const prefix = "GODEBUG="
 	var env string
 	switch GOOS {
@@ -808,12 +810,16 @@ func getGodebugEarly() string {
 			s := unsafe.String(p, findnull(p))
 
 			if stringslite.HasPrefix(s, prefix) {
-				env = gostring(p)[len(prefix):]
+				env = gostringnocopy(p)[len(prefix):]
 				break
 			}
 		}
+		break
+
+	default:
+		return "", false
 	}
-	return env
+	return env, true
 }
 
 // The bootstrap sequence is:
@@ -860,12 +866,15 @@ func schedinit() {
 	// The world starts stopped.
 	worldStopped()
 
+	godebug, parsedGodebug := getGodebugEarly()
+	if parsedGodebug {
+		parseRuntimeDebugVars(godebug)
+	}
 	ticks.init() // run as early as possible
 	moduledataverify()
 	stackinit()
 	randinit() // must run before mallocinit, alginit, mcommoninit
 	mallocinit()
-	godebug := getGodebugEarly()
 	cpuinit(godebug) // must run before alginit
 	alginit()        // maps, hash, rand must not be used before this call
 	mcommoninit(gp.m, -1)
@@ -881,7 +890,12 @@ func schedinit() {
 	goenvs()
 	secure()
 	checkfds()
-	parsedebugvars()
+	if !parsedGodebug {
+		// Some platforms, e.g., Windows, didn't make env vars available "early",
+		// so try again now.
+		parseRuntimeDebugVars(gogetenv("GODEBUG"))
+	}
+	finishDebugVarsSetup()
 	gcinit()
 
 	// Allocate stack space that can be used when crashing due to bad stack
@@ -1209,6 +1223,7 @@ func casfrom_Gscanstatus(gp *g, oldval, newval uint32) {
 		_Gscanwaiting,
 		_Gscanrunning,
 		_Gscansyscall,
+		_Gscanleaked,
 		_Gscanpreempted:
 		if newval == oldval&^_Gscan {
 			success = gp.atomicstatus.CompareAndSwap(oldval, newval)
@@ -1229,6 +1244,7 @@ func castogscanstatus(gp *g, oldval, newval uint32) bool {
 	case _Grunnable,
 		_Grunning,
 		_Gwaiting,
+		_Gleaked,
 		_Gsyscall:
 		if newval == oldval|_Gscan {
 			r := gp.atomicstatus.CompareAndSwap(oldval, newval)
@@ -5552,6 +5568,14 @@ func gcount(includeSys bool) int32 {
 	return n
 }
 
+// goroutineleakcount returns the number of leaked goroutines last reported by
+// the runtime.
+//
+//go:linkname goroutineleakcount runtime/pprof.runtime_goroutineleakcount
+func goroutineleakcount() int {
+	return work.goroutineLeak.count
+}
+
 func mcount() int32 {
 	return int32(sched.mnext - sched.nmfreed)
 }