revert r3864, it may cause kernel panic on some kernels while working with IPv6

diff --git a/src/os/unix/ngx_linux_config.h b/src/os/unix/ngx_linux_config.h
index 556651c8e43f3b1e17881b8886ea6e8e6694f1f8..cf45e54a19170317c45f37922c93a90532004cd3 100644 (file)
--- a/src/os/unix/ngx_linux_config.h
+++ b/src/os/unix/ngx_linux_config.h
@@ -88,7 +88,7 @@ typedef struct iocb  ngx_aiocb_t;
 #endif
 
 
-#define NGX_LISTEN_BACKLOG        -1
+#define NGX_LISTEN_BACKLOG        511
 
 
 #if defined TCP_DEFER_ACCEPT && !defined NGX_HAVE_DEFERRED_ACCEPT