// https://syzkaller.appspot.com/bug?id=145dc511c89df50c67ad274c5992991e6ea8333d
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void execute_one();
extern unsigned long long procid;

static void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      execute_one();
      doexit(0);
    }

    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid) {
        break;
      }
      usleep(1000);
      if (current_time_ms() - start < 3 * 1000)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

void execute_call(int call)
{
  switch (call) {
  case 0:
    *(uint32_t*)0x20000140 = 2;
    *(uint32_t*)0x20000144 = 0x70;
    *(uint8_t*)0x20000148 = 0xe3;
    *(uint8_t*)0x20000149 = 0;
    *(uint8_t*)0x2000014a = 0;
    *(uint8_t*)0x2000014b = 0;
    *(uint32_t*)0x2000014c = 0;
    *(uint64_t*)0x20000150 = 0;
    *(uint64_t*)0x20000158 = 0;
    *(uint64_t*)0x20000160 = 0;
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 1, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0x10000003, 5, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 10, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 22, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 24, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 27, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000168, 0, 29, 35);
    *(uint32_t*)0x20000170 = 0;
    *(uint32_t*)0x20000174 = 0;
    *(uint64_t*)0x20000178 = 0x20000080;
    *(uint64_t*)0x20000180 = 0;
    *(uint64_t*)0x20000188 = 0;
    *(uint64_t*)0x20000190 = 0;
    *(uint32_t*)0x20000198 = 0;
    *(uint32_t*)0x2000019c = 0;
    *(uint64_t*)0x200001a0 = 0;
    *(uint32_t*)0x200001a8 = 0;
    *(uint16_t*)0x200001ac = 0;
    *(uint16_t*)0x200001ae = 0;
    syscall(__NR_perf_event_open, 0x20000140, 0, 0, -1, 0);
    break;
  case 1:
    *(uint64_t*)0x20000040 = 0;
    syscall(__NR_set_mempolicy, 0, 0x20000040, 3);
    break;
  }
}

void execute_one()
{
  execute(2);
  collide = 1;
  execute(2);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}