// https://syzkaller.appspot.com/bug?id=ef1c55713fc7ee1fc39d3cb93d7654d74323cfcb
// 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 <stdint.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);
}

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 test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("loop fork failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      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 > 5 * 1000) {
        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;
      }
    }
  }
}

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

long r[1];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0x22000, 3, 0x32, -1, 0);
    break;
  case 1:
    *(uint32_t*)0x2001b000 = -1;
    *(uint64_t*)0x2001b008 = 0x2001efef;
    *(uint64_t*)0x2001b010 = 0x2001f000;
    *(uint64_t*)0x2001b018 = 0;
    syscall(__NR_bpf, 2, 0x2001b000, 0x20);
    break;
  case 2:
    *(uint32_t*)0x20004fd4 = 0xb;
    *(uint32_t*)0x20004fd8 = 7;
    *(uint32_t*)0x20004fdc = 3;
    *(uint32_t*)0x20004fe0 = 8;
    *(uint32_t*)0x20004fe4 = 1;
    *(uint32_t*)0x20004fe8 = -1;
    *(uint32_t*)0x20004fec = 0;
    *(uint8_t*)0x20004ff0 = 0;
    *(uint8_t*)0x20004ff1 = 0;
    *(uint8_t*)0x20004ff2 = 0;
    *(uint8_t*)0x20004ff3 = 0;
    *(uint8_t*)0x20004ff4 = 0;
    *(uint8_t*)0x20004ff5 = 0;
    *(uint8_t*)0x20004ff6 = 0;
    *(uint8_t*)0x20004ff7 = 0;
    *(uint8_t*)0x20004ff8 = 0;
    *(uint8_t*)0x20004ff9 = 0;
    *(uint8_t*)0x20004ffa = 0;
    *(uint8_t*)0x20004ffb = 0;
    *(uint8_t*)0x20004ffc = 0;
    *(uint8_t*)0x20004ffd = 0;
    *(uint8_t*)0x20004ffe = 0;
    *(uint8_t*)0x20004fff = 0;
    r[0] = syscall(__NR_bpf, 0, 0x20004fd4, 0x2ba);
    break;
  case 3:
    *(uint32_t*)0x2000b000 = r[0];
    *(uint64_t*)0x2000b008 = 0x2000b000;
    *(uint64_t*)0x2000b010 = 0x20001000;
    *(uint64_t*)0x2000b018 = 0;
    syscall(__NR_bpf, 2, 0x2000b000, 0x20);
    break;
  case 4:
    *(uint32_t*)0x2001f000 = r[0];
    *(uint64_t*)0x2001f008 = 0x20013f33;
    *(uint64_t*)0x2001f010 = 0x2001ffd8;
    syscall(__NR_bpf, 4, 0x2001f000, 0x18);
    break;
  case 5:
    *(uint32_t*)0x2000e000 = r[0];
    *(uint64_t*)0x2000e008 = 0x20001000;
    syscall(__NR_bpf, 3, 0x2000e000, 0x10);
    break;
  case 6:
    *(uint32_t*)0x2000e000 = r[0];
    *(uint64_t*)0x2000e008 = 0x2001f000;
    *(uint64_t*)0x2000e010 = 0x20007000;
    syscall(__NR_bpf, 4, 0x2000e000, 0x18);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(7);
  collide = 1;
  execute(7);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}