/* SPDX-License-Identifier: MIT */

// autogenerated by syzkaller (https://github.com/google/syzkaller)

#include <dirent.h>

#include <endian.h>

#include <errno.h>

#include <fcntl.h>

#include <pthread.h>

#include <signal.h>

#include <stdarg.h>

#include <stdbool.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/prctl.h>

#include <sys/stat.h>

#include <sys/syscall.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <time.h>

#include <unistd.h>

#include <sys/mman.h>

#include <linux/futex.h>

static void sleep_ms(uint64_t ms)

{

  usleep(ms * 1000);

}

static uint64_t current_time_ms(void)

{

  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))

    exit(1);

  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;

}

static void thread_start(void* (*fn)(void*), void* arg)

{

  pthread_t th;

  pthread_attr_t attr;

  pthread_attr_init(&attr);

  pthread_attr_setstacksize(&attr, 128 << 10);

  int i;

  for (i = 0; i < 100; i++) {

    if (pthread_create(&th, &attr, fn, arg) == 0) {

      pthread_attr_destroy(&attr);

      return;

    }

    if (errno == EAGAIN) {

      usleep(50);

      continue;

    }

    break;

  }

  exit(1);

}

typedef struct {

  int state;

} event_t;

static void event_init(event_t* ev)

{

  ev->state = 0;

}

static void event_reset(event_t* ev)

{

  ev->state = 0;

}

static void event_set(event_t* ev)

{

  if (ev->state)

    exit(1);

  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);

  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);

}

static void event_wait(event_t* ev)

{

  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))

    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);

}

static int event_isset(event_t* ev)

{

  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);

}

static int event_timedwait(event_t* ev, uint64_t timeout)

{

  uint64_t start = current_time_ms();

  uint64_t now = start;

  for (;;) {

    uint64_t remain = timeout - (now - start);

    struct timespec ts;

    ts.tv_sec = remain / 1000;

    ts.tv_nsec = (remain % 1000) * 1000 * 1000;

    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);

    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))

      return 1;

    now = current_time_ms();

    if (now - start > timeout)

      return 0;

  }

}

static bool write_file(const char* file, const char* what, ...)

{

  char buf[1024];

  va_list args;

  va_start(args, what);

  vsnprintf(buf, sizeof(buf), what, args);

  va_end(args);

  buf[sizeof(buf) - 1] = 0;

  int len = strlen(buf);

  int fd = open(file, O_WRONLY | O_CLOEXEC);

  if (fd == -1)

    return false;

  if (write(fd, buf, len) != len) {

    int err = errno;

    close(fd);

    errno = err;

    return false;

  }

  close(fd);

  return true;

}

static void kill_and_wait(int pid, int* status)

{

  kill(-pid, SIGKILL);

  kill(pid, SIGKILL);

  int i;

  for (i = 0; i < 100; i++) {

    if (waitpid(-1, status, WNOHANG | __WALL) == pid)

      return;

    usleep(1000);

  }

  DIR* dir = opendir("/sys/fs/fuse/connections");

  if (dir) {

    for (;;) {

      struct dirent* ent = readdir(dir);

      if (!ent)

        break;

      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)

        continue;

      char abort[300];

      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",

               ent->d_name);

      int fd = open(abort, O_WRONLY);

      if (fd == -1) {

        continue;

      }

      if (write(fd, abort, 1) < 0) {

      }

      close(fd);

    }

    closedir(dir);

  } else {

  }

  while (waitpid(-1, status, __WALL) != pid) {

  }

}

#define SYZ_HAVE_SETUP_TEST 1

static void setup_test()

{

  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);

  setpgrp();

  write_file("/proc/self/oom_score_adj", "1000");

}

struct thread_t {

  int created, call;

  event_t ready, done;

};

static struct thread_t threads[16];

static void execute_call(int call);

static int running;

static void* thr(void* arg)

{

  struct thread_t* th = (struct thread_t*)arg;

  for (;;) {

    event_wait(&th->ready);

    event_reset(&th->ready);

    execute_call(th->call);

    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);

    event_set(&th->done);

  }

  return 0;

}

static void execute_one(void)

{

  int i, call, thread;

  for (call = 0; call < 3; call++) {

    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));

         thread++) {

      struct thread_t* th = &threads[thread];

      if (!th->created) {

        th->created = 1;

        event_init(&th->ready);

        event_init(&th->done);

        event_set(&th->done);

        thread_start(thr, th);

      }

      if (!event_isset(&th->done))

        continue;

      event_reset(&th->done);

      th->call = call;

      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);

      event_set(&th->ready);

      event_timedwait(&th->done, 45);

      break;

    }

  }

  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)

    sleep_ms(1);

}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)

{

  int iter;

  for (iter = 0;; iter++) {

    int pid = fork();

    if (pid < 0)

      exit(1);

    if (pid == 0) {

      setup_test();

      execute_one();

      exit(0);

    }

    int status = 0;

    uint64_t start = current_time_ms();

    for (;;) {

      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)

        break;

      sleep_ms(1);

      if (current_time_ms() - start < 5 * 1000)

        continue;

      kill_and_wait(pid, &status);

      break;

    }

  }

}

#ifndef __NR_io_uring_register

#define __NR_io_uring_register 427

#endif

#ifndef __NR_io_uring_setup

#define __NR_io_uring_setup 425

#endif

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)

{

  long res;

  switch (call) {

  case 0:

    *(uint32_t*)0x20000040 = 0;

    *(uint32_t*)0x20000044 = 0;

    *(uint32_t*)0x20000048 = 0;

    *(uint32_t*)0x2000004c = 0;

    *(uint32_t*)0x20000050 = 0;

    *(uint32_t*)0x20000054 = 0;

    *(uint32_t*)0x20000058 = 0;

    *(uint32_t*)0x2000005c = 0;

    *(uint32_t*)0x20000060 = 0;

    *(uint32_t*)0x20000064 = 0;

    *(uint32_t*)0x20000068 = 0;

    *(uint32_t*)0x2000006c = 0;

    *(uint32_t*)0x20000070 = 0;

    *(uint32_t*)0x20000074 = 0;

    *(uint32_t*)0x20000078 = 0;

    *(uint32_t*)0x2000007c = 0;

    *(uint32_t*)0x20000080 = 0;

    *(uint32_t*)0x20000084 = 0;

    *(uint64_t*)0x20000088 = 0;

    *(uint32_t*)0x20000090 = 0;

    *(uint32_t*)0x20000094 = 0;

    *(uint32_t*)0x20000098 = 0;

    *(uint32_t*)0x2000009c = 0;

    *(uint32_t*)0x200000a0 = 0;

    *(uint32_t*)0x200000a4 = 0;

    *(uint32_t*)0x200000a8 = 0;

    *(uint32_t*)0x200000ac = 0;

    *(uint64_t*)0x200000b0 = 0;

    res = syscall(__NR_io_uring_setup, 0x64, 0x20000040);

    if (res != -1)

      r[0] = res;

    break;

  case 1:

    syscall(__NR_io_uring_register, (long)r[0], 0, 0, 0);

    break;

  case 2:

    syscall(__NR_io_uring_register, (long)r[0], 0, 0, 0);

    break;

  }

}

static void sig_int(int sig)

{

	exit(0);

}

int main(int argc, char *argv[])

{

	if (argc > 1)

		return 0;

	signal(SIGINT, sig_int);

	mmap((void *) 0x20000000, 0x1000000, 3, 0x32, -1, 0);

	loop();

	return 0;

}