1. There seems to be copy paste error, instead of clearing 
sigusr_action.sa_mask it clears sigint_action.sa_mask.
Change comes from 6c4d1c6d4b3c116ff88f9209b4860940fb8659a8

2. Other fields of these structures are left to be uninitialized.

Both 1) and 2) make the behaviour unexpected. Occasionally I saw,
this program to end upon receiving SIGUSR1.

Signed-off-by: Jan Stancek <[email protected]>
---
 .../controllers/memcg/functional/memcg_process.c   |    9 ++-

diff --git a/testcases/kernel/controllers/memcg/functional/memcg_process.c 
b/testcases/kernel/controllers/memcg/functional/memcg_process.c
index bccb2da..da91dc9 100644
--- a/testcases/kernel/controllers/memcg/functional/memcg_process.c
+++ b/testcases/kernel/controllers/memcg/functional/memcg_process.c
@@ -295,17 +295,18 @@ int main(int argc, char *argv[])
        if ((fd = open("/dev/zero", O_RDWR)) == -1)
                err(1, "open /dev/zero failed");
 
+       memset(&sigint_action, 0, sizeof(sigint_action));
+       memset(&sigusr_action, 0, sizeof(sigusr_action));
+
        /* TODO: writer error handling here. */
        sigemptyset(&sigint_action.sa_mask);
        sigint_action.sa_handler = &sigint_handler;
        sigaction(SIGINT, &sigint_action, NULL);
 
-       sigemptyset(&sigint_action.sa_mask);
+       sigemptyset(&sigusr_action.sa_mask);
        sigusr_action.sa_handler = &sigusr_handler;
        sigaction(SIGUSR1, &sigusr_action, NULL);
 
-       sigemptyset(&sigusr_action.sa_mask);
-
        process_options(argc, argv);
 
        while (!flag_exit)
-- 
1.7.1

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