fix: regression segfault on linux 3.4 on mipsle

.github/patch/cl747663.patch

@@ -0,0 +1,36 @@
+From b8f897a9da7a82ad8584a22284ceac61262fcb7e Mon Sep 17 00:00:00 2001
+From: Jorropo <jorropo.pgm@gmail.com>
+Date: Sun, 22 Feb 2026 01:47:45 +0100
+Subject: [PATCH] runtime: fix value of ENOSYS on mips from 38 to 89
+
+Fixes #77731
+
+Change-Id: Iaca444e2d5f9e19fd2de38414b357b41471a668c
+---
+
+diff --git a/src/runtime/defs_linux_mips64x.go b/src/runtime/defs_linux_mips64x.go
+index 7449d2c..4d0f103 100644
+--- a/src/runtime/defs_linux_mips64x.go
++++ b/src/runtime/defs_linux_mips64x.go
+@@ -12,7 +12,7 @@
+ 	_EINTR  = 0x4
+ 	_EAGAIN = 0xb
+ 	_ENOMEM = 0xc
+-	_ENOSYS = 0x26
++	_ENOSYS = 0x59
+ 
+ 	_PROT_NONE  = 0x0
+ 	_PROT_READ  = 0x1
+diff --git a/src/runtime/defs_linux_mipsx.go b/src/runtime/defs_linux_mipsx.go
+index 5a446e0..b8da4d0 100644
+--- a/src/runtime/defs_linux_mipsx.go
++++ b/src/runtime/defs_linux_mipsx.go
+@@ -12,7 +12,7 @@
+ 	_EINTR  = 0x4
+ 	_EAGAIN = 0xb
+ 	_ENOMEM = 0xc
+-	_ENOSYS = 0x26
++	_ENOSYS = 0x59
+ 
+ 	_PROT_NONE  = 0x0
+ 	_PROT_READ  = 0x1

.github/workflows/build.yml

@@ -179,6 +179,13 @@ jobs:
         tar zxf go1.26.0.linux-amd64-abi1.tar.gz -C $HOME/usr/local
         echo "$HOME/usr/local/go/bin" >> $GITHUB_PATH
 
+      # TODO: remove after CL747663 merged, see: https://github.com/golang/go/issues/77731
+    - name: Apply CL747663 for Golang1.26
+      if: ${{ matrix.jobs.goversion == '' }}
+      run: |
+        cd $(go env GOROOT)
+        patch --verbose -p 1 < $GITHUB_WORKSPACE/.github/patch/cl747663.patch
+
       # this patch file only works on golang1.26.x
       # that means after golang1.27 release it must be changed
       # see: https://github.com/MetaCubeX/go/commits/release-branch.go1.26/