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Linux/tools/testing/selftests/timers/leapcrash.c

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  1 /* Demo leapsecond deadlock
  2  *              by: John Stultz (john.stultz@linaro.org)
  3  *              (C) Copyright IBM 2012
  4  *              (C) Copyright 2013, 2015 Linaro Limited
  5  *              Licensed under the GPL
  6  *
  7  * This test demonstrates leapsecond deadlock that is possibe
  8  * on kernels from 2.6.26 to 3.3.
  9  *
 10  * WARNING: THIS WILL LIKELY HARDHANG SYSTEMS AND MAY LOSE DATA
 11  * RUN AT YOUR OWN RISK!
 12  *  To build:
 13  *      $ gcc leapcrash.c -o leapcrash -lrt
 14  */
 15 
 16 
 17 
 18 #include <stdio.h>
 19 #include <stdlib.h>
 20 #include <time.h>
 21 #include <sys/time.h>
 22 #include <sys/timex.h>
 23 #include <string.h>
 24 #include <signal.h>
 25 #include "../kselftest.h"
 26 
 27 /* clear NTP time_status & time_state */
 28 int clear_time_state(void)
 29 {
 30         struct timex tx;
 31         int ret;
 32 
 33         /*
 34          * We have to call adjtime twice here, as kernels
 35          * prior to 6b1859dba01c7 (included in 3.5 and
 36          * -stable), had an issue with the state machine
 37          * and wouldn't clear the STA_INS/DEL flag directly.
 38          */
 39         tx.modes = ADJ_STATUS;
 40         tx.status = STA_PLL;
 41         ret = adjtimex(&tx);
 42 
 43         tx.modes = ADJ_STATUS;
 44         tx.status = 0;
 45         ret = adjtimex(&tx);
 46 
 47         return ret;
 48 }
 49 
 50 /* Make sure we cleanup on ctrl-c */
 51 void handler(int unused)
 52 {
 53         clear_time_state();
 54         exit(0);
 55 }
 56 
 57 
 58 int main(void)
 59 {
 60         struct timex tx;
 61         struct timespec ts;
 62         time_t next_leap;
 63         int count = 0;
 64 
 65         setbuf(stdout, NULL);
 66 
 67         signal(SIGINT, handler);
 68         signal(SIGKILL, handler);
 69         printf("This runs for a few minutes. Press ctrl-c to stop\n");
 70 
 71         clear_time_state();
 72 
 73 
 74         /* Get the current time */
 75         clock_gettime(CLOCK_REALTIME, &ts);
 76 
 77         /* Calculate the next possible leap second 23:59:60 GMT */
 78         next_leap = ts.tv_sec;
 79         next_leap += 86400 - (next_leap % 86400);
 80 
 81         for (count = 0; count < 20; count++) {
 82                 struct timeval tv;
 83 
 84 
 85                 /* set the time to 2 seconds before the leap */
 86                 tv.tv_sec = next_leap - 2;
 87                 tv.tv_usec = 0;
 88                 if (settimeofday(&tv, NULL)) {
 89                         printf("Error: You're likely not running with proper (ie: root) permissions\n");
 90                         return ksft_exit_fail();
 91                 }
 92                 tx.modes = 0;
 93                 adjtimex(&tx);
 94 
 95                 /* hammer on adjtime w/ STA_INS */
 96                 while (tx.time.tv_sec < next_leap + 1) {
 97                         /* Set the leap second insert flag */
 98                         tx.modes = ADJ_STATUS;
 99                         tx.status = STA_INS;
100                         adjtimex(&tx);
101                 }
102                 clear_time_state();
103                 printf(".");
104         }
105         printf("[OK]\n");
106         return ksft_exit_pass();
107 }
108 

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