// https://syzkaller.appspot.com/bug?id=8ff44e6f546f5be932d5612c25092fa9084b40b6
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#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/mount.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 <linux/futex.h>

#ifndef __NR_mkdirat
#define __NR_mkdirat 34
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mount
#define __NR_mount 40
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif
#ifndef __NR_write
#define __NR_write 64
#endif

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 = 0;
  for (; 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, 1000000);
}

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_ACQUIRE))
      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);
  for (int 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) {
  }
}

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)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 19; 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, 50);
      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 = 0;
  for (;; 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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[7] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  mkdirat arguments: [
    //    fd: fd_dir (resource)
    //    path: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 00} (length 0x6)
    //    }
    //    mode: open_mode = 0x1ff (8 bytes)
    //  ]
    memcpy((void*)0x20000040, "./sys\000", 6);
    syscall(
        __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x20000040ul,
        /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
        0x1fful);
    break;
  case 1:
    //  mount arguments: [
    //    src: nil
    //    dst: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 00} (length 0x6)
    //    }
    //    type: ptr[in, buffer] {
    //      buffer: {73 79 73 66 73 00} (length 0x6)
    //    }
    //    flags: mount_flags = 0x0 (8 bytes)
    //    data: nil
    //  ]
    memcpy((void*)0x20000080, "./sys\000", 6);
    memcpy((void*)0x200000c0, "sysfs\000", 6);
    syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x20000080ul,
            /*type=*/0x200000c0ul, /*flags=*/0ul, /*data=*/0ul);
    break;
  case 2:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 6d 6f 64 75 6c 65 2f 6d 64 5f 6d 6f 64 2f
    //      70 61 72 61 6d 65 74 65 72 73 2f 6e 65 77 5f 61 72 72 61 79 00}
    //      (length 0x29)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x20000100, "./sys/module/md_mod/parameters/new_array\000",
           41);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000100ul,
                  /*flags=O_WRONLY*/ 1, /*mode=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {6d 64 30 0a} (length 0x4)
    //    }
    //    count: len = 0x4 (8 bytes)
    //  ]
    memcpy((void*)0x20000140, "md0\n", 4);
    syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x20000140ul, /*count=*/4ul);
    break;
  case 4:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 62 6c 6f 63 6b 2f 6d 64 30 2f 6d 64 2f 6c
    //      65 76 65 6c 00} (length 0x19)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x20000180, "./sys/block/md0/md/level\000", 25);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000180ul,
                  /*flags=O_WRONLY*/ 1, /*mode=*/0);
    if (res != -1)
      r[1] = res;
    break;
  case 5:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {72 61 69 64 31 0a} (length 0x6)
    //    }
    //    count: len = 0x6 (8 bytes)
    //  ]
    memcpy((void*)0x200001c0, "raid1\n", 6);
    syscall(__NR_write, /*fd=*/r[1], /*buf=*/0x200001c0ul, /*count=*/6ul);
    break;
  case 6:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 62 6c 6f 63 6b 2f 6d 64 30 2f 6d 64 2f 72
    //      61 69 64 5f 64 69 73 6b 73 00} (length 0x1e)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x20000200, "./sys/block/md0/md/raid_disks\000", 30);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000200ul,
                  /*flags=O_WRONLY*/ 1, /*mode=*/0);
    if (res != -1)
      r[2] = res;
    break;
  case 7:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {32 0a} (length 0x2)
    //    }
    //    count: len = 0x2 (8 bytes)
    //  ]
    memcpy((void*)0x20000240, "2\n", 2);
    syscall(__NR_write, /*fd=*/r[2], /*buf=*/0x20000240ul, /*count=*/2ul);
    break;
  case 8:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 62 6c 6f 63 6b 2f 6d 64 30 2f 6d 64 2f 6e
    //      65 77 5f 64 65 76 00} (length 0x1b)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x20000280, "./sys/block/md0/md/new_dev\000", 27);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000280ul,
                  /*flags=O_WRONLY*/ 1, /*mode=*/0);
    if (res != -1)
      r[3] = res;
    break;
  case 9:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {31 3a 30 0a} (length 0x4)
    //    }
    //    count: len = 0x4 (8 bytes)
    //  ]
    memcpy((void*)0x200002c0, "1:0\n", 4);
    syscall(__NR_write, /*fd=*/r[3], /*buf=*/0x200002c0ul, /*count=*/4ul);
    break;
  case 10:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 62 6c 6f 63 6b 2f 6d 64 30 2f 6d 64 2f 64
    //      65 76 2d 72 61 6d 30 2f 73 6c 6f 74 00} (length 0x21)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x20000380, "./sys/block/md0/md/dev-ram0/slot\000", 33);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000380ul,
                  /*flags=O_WRONLY*/ 1, /*mode=*/0);
    if (res != -1)
      r[4] = res;
    break;
  case 11:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {30 0a} (length 0x2)
    //    }
    //    count: len = 0x2 (8 bytes)
    //  ]
    memcpy((void*)0x200003c0, "0\n", 2);
    syscall(__NR_write, /*fd=*/r[4], /*buf=*/0x200003c0ul, /*count=*/2ul);
    break;
  case 12:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: nil
    //    count: len = 0x0 (8 bytes)
    //  ]
    syscall(__NR_write, /*fd=*/(intptr_t)-1, /*buf=*/0ul, /*count=*/0ul);
    break;
  case 13:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: nil
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0ul, /*flags=O_WRONLY*/ 1,
            /*mode=*/0);
    break;
  case 14:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 62 6c 6f 63 6b 2f 6d 64 30 2f 6d 64 2f 61
    //      72 72 61 79 5f 73 74 61 74 65 00} (length 0x1f)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x20000500, "./sys/block/md0/md/array_state\000", 31);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000500ul,
                  /*flags=O_WRONLY*/ 1, /*mode=*/0);
    if (res != -1)
      r[5] = res;
    break;
  case 15:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {72 65 61 64 6f 6e 6c 79 0a} (length 0x9)
    //    }
    //    count: len = 0x9 (8 bytes)
    //  ]
    memcpy((void*)0x20000540, "readonly\n", 9);
    syscall(__NR_write, /*fd=*/r[5], /*buf=*/0x20000540ul, /*count=*/9ul);
    break;
  case 16:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {69 6e 61 63 74 69 76 65 0a} (length 0x9)
    //    }
    //    count: len = 0x9 (8 bytes)
    //  ]
    memcpy((void*)0x20000580, "inactive\n", 9);
    syscall(__NR_write, /*fd=*/r[5], /*buf=*/0x20000580ul, /*count=*/9ul);
    break;
  case 17:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 62 6c 6f 63 6b 2f 6d 64 30 2f 6d 64 2f 62
    //      69 74 6d 61 70 2f 6c 6f 63 61 74 69 6f 6e 00} (length 0x23)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x200005c0, "./sys/block/md0/md/bitmap/location\000", 35);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200005c0ul,
                  /*flags=O_WRONLY*/ 1, /*mode=*/0);
    if (res != -1)
      r[6] = res;
    break;
  case 18:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {31} (length 0x1)
    //    }
    //    count: len = 0x1 (8 bytes)
    //  ]
    memset((void*)0x20000600, 49, 1);
    syscall(__NR_write, /*fd=*/r[6], /*buf=*/0x20000600ul, /*count=*/1ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}