[LTP] [PATCH] syscalls/setrlimit06: Add new test for RLIMIT_CPU
Cyril Hrubis
chrubis@suse.cz
Thu Jan 31 11:53:43 CET 2019
Hi!
> This is also a regression test for commit c3bca5d450b62 in kernel:
> "posix-cpu-timers: Ensure set_process_cpu_timer is always evaluated"
>
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
> runtest/syscalls | 1 +
> testcases/kernel/syscalls/setrlimit/.gitignore | 1 +
> testcases/kernel/syscalls/setrlimit/setrlimit06.c | 108 ++++++++++++++++++++++
> 3 files changed, 110 insertions(+)
> create mode 100644 testcases/kernel/syscalls/setrlimit/setrlimit06.c
>
> diff --git a/runtest/syscalls b/runtest/syscalls
> index 668c87c..2e36709 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -1197,6 +1197,7 @@ setrlimit02 setrlimit02
> setrlimit03 setrlimit03
> setrlimit04 setrlimit04
> setrlimit05 setrlimit05
> +setrlimit06 setrlimit06
>
> set_robust_list01 set_robust_list01
> set_thread_area01 set_thread_area01
> diff --git a/testcases/kernel/syscalls/setrlimit/.gitignore b/testcases/kernel/syscalls/setrlimit/.gitignore
> index e91f7e8..a790eb9 100644
> --- a/testcases/kernel/syscalls/setrlimit/.gitignore
> +++ b/testcases/kernel/syscalls/setrlimit/.gitignore
> @@ -3,3 +3,4 @@
> /setrlimit03
> /setrlimit04
> /setrlimit05
> +/setrlimit06
> diff --git a/testcases/kernel/syscalls/setrlimit/setrlimit06.c b/testcases/kernel/syscalls/setrlimit/setrlimit06.c
> new file mode 100644
> index 0000000..d6004a5
> --- /dev/null
> +++ b/testcases/kernel/syscalls/setrlimit/setrlimit06.c
> @@ -0,0 +1,108 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2019 FUJITSU LIMITED. All rights reserved.
> + * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
> + */
> +
> +/*
> + * Description:
> + * Set CPU time limit for a process and check its behavior
> + * when reaching CPU time limit.
> + * 1) Process received SIGXCPU signal when reaching soft limit
> + * of CPU time.
> + * 2) Process received SIGKILL signal when reaching hard limit
> + * of CPU time.
> + *
> + * Note:
> + * This is also a regression test for the following kernel bug:
> + * 'c3bca5d450b62 ("posix-cpu-timers: Ensure set_process_cpu_timer is always evaluated")'
> + */
> +
> +#define _GNU_SOURCE
> +#include <errno.h>
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <sys/time.h>
> +#include <sys/resource.h>
> +#include <sys/wait.h>
> +
> +#include "tst_test.h"
> +
> +static volatile int end;
> +
> +static void sighandler(int sig)
> +{
> + end = sig;
> +}
> +
> +static void setup(void)
> +{
> + SAFE_SIGNAL(SIGALRM, SIG_DFL);
The SIGALRM handler should be set to SIG_DFL for the test process in the
test library. At least that's what we do in fork_testrun() function in
tst_test.c
> + SAFE_SIGNAL(SIGXCPU, sighandler);
> +}
> +
> +static void verify_setrlimit(void)
> +{
> + int status;
> + pid_t pid;
> +
> + pid = vfork();
> + if (pid == -1)
> + tst_brk(TBROK, "vfork() failed");
Why vfork? You are not supposed to use vfork() for anything but vfork()
+ exec(). As it is the code below invokes undefined behavior.
> + if (!pid) {
> + struct rlimit rlim = {
> + .rlim_cur = 2,
> + .rlim_max = 3,
> + };
> +
> + TEST(setrlimit(RLIMIT_CPU, &rlim));
> + if (TST_RET == -1) {
> + tst_res(TFAIL | TTERRNO,
> + "setrlimit(RLIMIT_CPU) failed");
> + _exit(1);
> + }
> +
> + alarm(10);
> +
> + while (1);
> + }
> +
> + SAFE_WAITPID(pid, &status, 0);
> +
> + if (WIFEXITED(status) && WEXITSTATUS(status) == 1)
> + return;
> +
> + if (WIFSIGNALED(status)) {
> + if (WTERMSIG(status) == SIGKILL && end == SIGXCPU) {
> + tst_res(TPASS,
> + "Process received SIGXCPU and SIGKILL when reaching soft and hard limit of CPU time");
This message is far too long, please be short and to the point,
somethig as:
tst_res(TPASS, "Got SIGXCPU then SIGKILL after reaching both limits");
> + return;
> + }
> +
> + if (WTERMSIG(status) == SIGKILL && !end) {
> + tst_res(TFAIL,
> + "Process only received SIGKILL when reaching CPU time hard limit");
Here as well, something as:
tst_res(TFAIL, "Got only SIGKILL after reaching both limits");
> + return;
> + }
> +
> + if (WTERMSIG(status) == SIGALRM && end == SIGXCPU) {
> + tst_res(TFAIL,
> + "Process only received SIGXCPU when reaching CPU time soft limit");
And here as well.
> + return;
> + }
> +
> + if (WTERMSIG(status) == SIGALRM && !end) {
> + tst_res(TFAIL,
> + "Process didn't receive any signal when reaching soft and hard limit of CPU time");
And here as well.
> + return;
> + }
> + }
> +
> + tst_res(TBROK, "child %s", tst_strstatus(status));
> +}
> +
> +static struct tst_test test = {
> + .test_all = verify_setrlimit,
> + .setup = setup,
> +};
--
Cyril Hrubis
chrubis@suse.cz
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