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Commit d7b2902c authored by John Stultz's avatar John Stultz Committed by Shuah Khan
Browse files

selftests/timers: Add leapcrash test from the timetest suite 



This change adds the leapcrash test which tests to see if a
leapsecond deadlock which was observed from 2.6.26 to 3.3
is present on this system.

Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Tested-by: default avatarPrarit Bhargava <prarit@redhat.com>
Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
parent 5bccfe41

tools/testing/selftests/timers/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ LDFLAGS += -lrt -lpthread 
bins = posix_timers nanosleep inconsistency-check nsleep-lat raw_skew \

	set-timer-lat threadtest mqueue-lat valid-adjtimex \

	alarmtimer-suspend change_skew skew_consistency clocksource-switch \

	leap-a-day

	leap-a-day leapcrash



all: ${bins}
@@ -31,6 +31,7 @@ run_destructive_tests: run_tests 
	./skew_consistency

	./clocksource-switch

	./leap-a-day -s -i 10

	./leapcrash



clean:

	rm -f ${bins}

tools/testing/selftests/timers/leapcrash.c

0 → 100644
+120 −0
Original line number Diff line number Diff line 
/* Demo leapsecond deadlock

 *              by: John Stultz (john.stultz@linaro.org)

 *              (C) Copyright IBM 2012

 *              (C) Copyright 2013, 2015 Linaro Limited

 *              Licensed under the GPL

 *

 * This test demonstrates leapsecond deadlock that is possibe

 * on kernels from 2.6.26 to 3.3.

 *

 * WARNING: THIS WILL LIKELY HARDHANG SYSTEMS AND MAY LOSE DATA

 * RUN AT YOUR OWN RISK!

 *  To build:

 *	$ gcc leapcrash.c -o leapcrash -lrt

 */







#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <sys/time.h>

#include <sys/timex.h>

#include <string.h>

#include <signal.h>

#ifdef KTEST

#include "../kselftest.h"

#else

static inline int ksft_exit_pass(void)

{

	exit(0);

}

static inline int ksft_exit_fail(void)

{

	exit(1);

}

#endif







/* clear NTP time_status & time_state */

int clear_time_state(void)

{

	struct timex tx;

	int ret;



	/*

	 * We have to call adjtime twice here, as kernels

	 * prior to 6b1859dba01c7 (included in 3.5 and

	 * -stable), had an issue with the state machine

	 * and wouldn't clear the STA_INS/DEL flag directly.

	 */

	tx.modes = ADJ_STATUS;

	tx.status = STA_PLL;

	ret = adjtimex(&tx);



	tx.modes = ADJ_STATUS;

	tx.status = 0;

	ret = adjtimex(&tx);



	return ret;

}



/* Make sure we cleanup on ctrl-c */

void handler(int unused)

{

	clear_time_state();

	exit(0);

}





int main(void)

{

	struct timex tx;

	struct timespec ts;

	time_t next_leap;

	int count = 0;



	setbuf(stdout, NULL);



	signal(SIGINT, handler);

	signal(SIGKILL, handler);

	printf("This runs for a few minutes. Press ctrl-c to stop\n");



	clear_time_state();





	/* Get the current time */

	clock_gettime(CLOCK_REALTIME, &ts);



	/* Calculate the next possible leap second 23:59:60 GMT */

	next_leap = ts.tv_sec;

	next_leap += 86400 - (next_leap % 86400);



	for (count = 0; count < 20; count++) {

		struct timeval tv;





		/* set the time to 2 seconds before the leap */

		tv.tv_sec = next_leap - 2;

		tv.tv_usec = 0;

		if (settimeofday(&tv, NULL)) {

			printf("Error: You're likely not running with proper (ie: root) permissions\n");

			return ksft_exit_fail();

		}

		tx.modes = 0;

		adjtimex(&tx);



		/* hammer on adjtime w/ STA_INS */

		while (tx.time.tv_sec < next_leap + 1) {

			/* Set the leap second insert flag */

			tx.modes = ADJ_STATUS;

			tx.status = STA_INS;

			adjtimex(&tx);

		}

		clear_time_state();

		printf(".");

	}

	printf("[OK]\n");

	return ksft_exit_pass();

}