From 7bf9457f71910b6fc57f8fb2223ff94a590db552 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cristian=20Rodr=C3=ADguez?= <crrodriguez@opensuse.org>
Date: Thu, 28 Apr 2016 02:22:53 -0300
Subject: [PATCH] pmap: Do not display error if shmctl(..IPC_RMID) returns
 EINVAL

The segment may have been destroyed by the kernel automagically
after shmdt(addr)

How to reproduce:

sysctl -w kernel.shm_rmid_forced=1
./pmap 1
shared memory remove: Invalid argument
[..]
---
 pmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pmap.c b/pmap.c
index 0ca95e9c..b2851c5e 100644
--- a/pmap.c
+++ b/pmap.c
@@ -201,7 +201,7 @@ static void discover_shm_minor(void)
 		perror(_("shared memory detach"));
 
 out_destroy:
-	if (shmctl(shmid, IPC_RMID, NULL))
+	if (shmctl(shmid, IPC_RMID, NULL) && errno != EINVAL)
 		perror(_("shared memory remove"));
 
 	return;