// https://syzkaller.appspot.com/bug?id=95f89b8fb9fdc42e28ad586e657fea074e4e719b
// 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);
}

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;
      }
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    memcpy((void*)0x20000140, "/dev/infiniband/rdma_cm", 24);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000140, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x200000c0 = 0;
    *(uint16_t*)0x200000c4 = 0x18;
    *(uint16_t*)0x200000c6 = 0xfa00;
    *(uint64_t*)0x200000c8 = 0;
    *(uint64_t*)0x200000d0 = 0x20000080;
    *(uint16_t*)0x200000d8 = 2;
    *(uint8_t*)0x200000da = 0;
    *(uint8_t*)0x200000db = 0;
    *(uint8_t*)0x200000dc = 0;
    *(uint8_t*)0x200000dd = 0;
    *(uint8_t*)0x200000de = 0;
    *(uint8_t*)0x200000df = 0;
    res = syscall(__NR_write, r[0], 0x200000c0, 0xfffffe84);
    if (res != -1)
      r[1] = *(uint32_t*)0x20000080;
    break;
  case 2:
    *(uint64_t*)0x20001340 = 0x20000180;
    *(uint64_t*)0x20001348 = 0;
    *(uint64_t*)0x20001350 = 0x20000240;
    *(uint64_t*)0x20001358 = 0;
    *(uint64_t*)0x20001360 = 0x200002c0;
    *(uint64_t*)0x20001368 = 0;
    *(uint64_t*)0x20001370 = 0x20000100;
    *(uint64_t*)0x20001378 = 0;
    *(uint64_t*)0x20001380 = 0x200012c0;
    *(uint64_t*)0x20001388 = 0;
    syscall(__NR_vmsplice, r[0], 0x20001340, 5, 0xd);
    break;
  case 3:
    memcpy((void*)0x20000040, "\x02\x00\x00\x00\x28\x00\x00\xfd\xd2\xcf\x90\x43"
                              "\x12\xa3\x45\x00\x0a\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x1c\xcb\xcd\x16\x00\x00"
                              "\x00\x00\x00\x00\x00\x08\x00\x00",
           44);
    *(uint32_t*)0x2000006c = r[1];
    syscall(__NR_write, r[0], 0x20000040, 0x30);
    break;
  case 4:
    *(uint32_t*)0x20000000 = 7;
    *(uint16_t*)0x20000004 = 8;
    *(uint16_t*)0x20000006 = 0xfa00;
    *(uint32_t*)0x20000008 = r[1];
    *(uint32_t*)0x2000000c = 0;
    syscall(__NR_write, r[0], 0x20000000, 0x10);
    break;
  }
}

void execute_one()
{
  execute(5);
  collide = 1;
  execute(5);
}

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