From f8f9b01d978f86b94b675712ca7d5beeca7c08b5 Mon Sep 17 00:00:00 2001
From: Michal Berger <michallinuxstuff@gmail.com>
Date: Fri, 18 Feb 2022 12:07:56 +0100
Subject: [PATCH] test/scheduler: Skip process if reading from /proc/pid/cgroup
 fails

This may happen when given process terminates right after we checked
for existance of the pid/cgroup but before we attempt to read the
file. When read fails, simply skip that process and continue.

Fixes issue #2381

Signed-off-by: Michal Berger <michallinuxstuff@gmail.com>
Change-Id: Ic859444769d1bfe18cf02bdd23cbef56407289a7
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/11670
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Pawel Piatek <pawelx.piatek@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Dong Yi <dongx.yi@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
---
 test/scheduler/cgroups.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/scheduler/cgroups.sh b/test/scheduler/cgroups.sh
index 8a3ebbf5ae..68bc3230dd 100644
--- a/test/scheduler/cgroups.sh
+++ b/test/scheduler/cgroups.sh
@@ -26,11 +26,11 @@ init_cpuset_cgroup() {
 		# v1, move all the threads from all the existing cgroups to the top
 		# cgroup / and then migrate it to the /cpuset we created above.
 		for cgroup in /proc/+([0-9])/cgroup; do
-			[[ -e $cgroup ]] || continue
-			cgroup=$(< "$cgroup") cgroup=${cgroup##*:}
+			cgroup=$(< "$cgroup") || continue
+			cgroup=${cgroup##*:}
 			[[ $cgroup != / ]] || continue
 			move_cgroup_procs "${cgroup##*:}" /
-		done
+		done 2> /dev/null
 		# Now, move all the threads to the cpuset
 		move_cgroup_procs / /cpuset
 	elif ((cgroup_version == 1)); then