snapshot: sagernet/gvisor v0.0.0-20250811.0-sing-box-mod.1

Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом
без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в
каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для
неё не нужна.

Module path github.com/sagernet/gvisor сохранён намеренно: на него
опирается replace-директива суперпроекта.

Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show
и переносилась на новый пин копированием.

SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH

pkg/tcpip/stack/neighbor_cache_mutex.go

@@ -0,0 +1,96 @@
+package stack
+
+import (
+	"reflect"
+
+	"github.com/sagernet/gvisor/pkg/sync"
+	"github.com/sagernet/gvisor/pkg/sync/locking"
+)
+
+// RWMutex is sync.RWMutex with the correctness validator.
+type neighborCacheRWMutex struct {
+	mu sync.RWMutex
+}
+
+// lockNames is a list of user-friendly lock names.
+// Populated in init.
+var neighborCachelockNames []string
+
+// lockNameIndex is used as an index passed to NestedLock and NestedUnlock,
+// referring to an index within lockNames.
+// Values are specified using the "consts" field of go_template_instance.
+type neighborCachelockNameIndex int
+
+// DO NOT REMOVE: The following function automatically replaced with lock index constants.
+// LOCK_NAME_INDEX_CONSTANTS
+const ()
+
+// Lock locks m.
+// +checklocksignore
+func (m *neighborCacheRWMutex) Lock() {
+	locking.AddGLock(neighborCacheprefixIndex, -1)
+	m.mu.Lock()
+}
+
+// NestedLock locks m knowing that another lock of the same type is held.
+// +checklocksignore
+func (m *neighborCacheRWMutex) NestedLock(i neighborCachelockNameIndex) {
+	locking.AddGLock(neighborCacheprefixIndex, int(i))
+	m.mu.Lock()
+}
+
+// Unlock unlocks m.
+// +checklocksignore
+func (m *neighborCacheRWMutex) Unlock() {
+	m.mu.Unlock()
+	locking.DelGLock(neighborCacheprefixIndex, -1)
+}
+
+// NestedUnlock unlocks m knowing that another lock of the same type is held.
+// +checklocksignore
+func (m *neighborCacheRWMutex) NestedUnlock(i neighborCachelockNameIndex) {
+	m.mu.Unlock()
+	locking.DelGLock(neighborCacheprefixIndex, int(i))
+}
+
+// RLock locks m for reading.
+// +checklocksignore
+func (m *neighborCacheRWMutex) RLock() {
+	locking.AddGLock(neighborCacheprefixIndex, -1)
+	m.mu.RLock()
+}
+
+// RUnlock undoes a single RLock call.
+// +checklocksignore
+func (m *neighborCacheRWMutex) RUnlock() {
+	m.mu.RUnlock()
+	locking.DelGLock(neighborCacheprefixIndex, -1)
+}
+
+// RLockBypass locks m for reading without executing the validator.
+// +checklocksignore
+func (m *neighborCacheRWMutex) RLockBypass() {
+	m.mu.RLock()
+}
+
+// RUnlockBypass undoes a single RLockBypass call.
+// +checklocksignore
+func (m *neighborCacheRWMutex) RUnlockBypass() {
+	m.mu.RUnlock()
+}
+
+// DowngradeLock atomically unlocks rw for writing and locks it for reading.
+// +checklocksignore
+func (m *neighborCacheRWMutex) DowngradeLock() {
+	m.mu.DowngradeLock()
+}
+
+var neighborCacheprefixIndex *locking.MutexClass
+
+// DO NOT REMOVE: The following function is automatically replaced.
+func neighborCacheinitLockNames() {}
+
+func init() {
+	neighborCacheinitLockNames()
+	neighborCacheprefixIndex = locking.NewMutexClass(reflect.TypeOf(neighborCacheRWMutex{}), neighborCachelockNames)
+}