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    Subject[PATCH 16/19] selftests/timers: Add leapcrash test from the timetest suite
    Date
    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: John Stultz <john.stultz@linaro.org>
    ---
    tools/testing/selftests/timers/Makefile | 3 +-
    tools/testing/selftests/timers/leapcrash.c | 120 +++++++++++++++++++++++++++++
    2 files changed, 122 insertions(+), 1 deletion(-)
    create mode 100644 tools/testing/selftests/timers/leapcrash.c

    diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
    index da35ddd..d733324 100644
    --- a/tools/testing/selftests/timers/Makefile
    +++ b/tools/testing/selftests/timers/Makefile
    @@ -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}
    diff --git a/tools/testing/selftests/timers/leapcrash.c b/tools/testing/selftests/timers/leapcrash.c
    new file mode 100644
    index 0000000..a1071bd
    --- /dev/null
    +++ b/tools/testing/selftests/timers/leapcrash.c
    @@ -0,0 +1,120 @@
    +/* 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();
    +}
    --
    1.9.1


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