ydb/contrib/libs/grpc/patches/18-fail-on-accept4-failure.patch

--- a/src/core/lib/iomgr/tcp_server_posix.cc
+++ b/src/core/lib/iomgr/tcp_server_posix.cc
@@ -38,5 +38,6 @@
 #include <util/generic/string.h>
 #include <util/string/cast.h>
+#include <util/system/yassert.h>
 
 #include "y_absl/strings/str_cat.h"
 #include "y_absl/strings/str_format.h"
@@ -209,6 +209,8 @@
       if (errno == EAGAIN || errno == ECONNABORTED || errno == EWOULDBLOCK) {
         grpc_fd_notify_on_read(sp->emfd, &sp->read_closure);
         return;
+      } else if (errno == ENFILE) {
+        Y_ABORT("grpc failed accept4: %s", strerror(errno));
       }
       gpr_mu_lock(&sp->server->mu);
       if (!sp->server->shutdown_listeners) {