selftests/timers: Add leapcrash test from the timetest suite (d7b2902c) · Commits · 戴 / test

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();
		}

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