From bb7fb8a5fac1ad9570c554c366826d649350acbe Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Tue, 18 Jan 2022 19:44:34 -0800
Subject: runtime: print error if mmap fails

Fixes #49687

Change-Id: Ife7f64f4c98449eaff7327e09bc1fb67acee72c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/379354
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
---
 src/runtime/mem_linux.go | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/runtime/mem_linux.go')

diff --git a/src/runtime/mem_linux.go b/src/runtime/mem_linux.go
index f8f9c53170..f8333014c2 100644
--- a/src/runtime/mem_linux.go
+++ b/src/runtime/mem_linux.go
@@ -189,6 +189,7 @@ func sysMap(v unsafe.Pointer, n uintptr, sysStat *sysMemStat) {
 		throw("runtime: out of memory")
 	}
 	if p != v || err != 0 {
+		print("runtime: mmap(", v, ", ", n, ") returned ", p, ", ", err, "\n")
 		throw("runtime: cannot map pages in arena address space")
 	}
 }
-- 
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