// https://syzkaller.appspot.com/bug?id=9b035afe38a2757dc2bc11a96bce2a210221e500
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.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 = 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;
  }
}

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 loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 8; 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);
}

uint64_t r[3] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  openat$ptmx arguments: [
    //    fd: const = 0xffffffffffffff9c (8 bytes)
    //    file: ptr[in, buffer] {
    //      buffer: {2f 64 65 76 2f 70 74 6d 78 00} (length 0xa)
    //    }
    //    flags: open_flags = 0xa82 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd_tty
    memcpy((void*)0x200000000180, "/dev/ptmx\000", 10);
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x200000000180ul,
                  /*flags=O_TRUNC|O_NONBLOCK|O_EXCL|O_RDWR*/ 0xa82, /*mode=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  ioctl$TIOCSETD arguments: [
    //    fd: fd_tty (resource)
    //    cmd: const = 0x5423 (4 bytes)
    //    arg: ptr[in, int32] {
    //      int32 = 0x2 (4 bytes)
    //    }
    //  ]
    *(uint32_t*)0x200000000040 = 2;
    syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x5423, /*arg=*/0x200000000040ul);
    break;
  case 2:
    //  io_setup arguments: [
    //    n: int32 = 0x7 (4 bytes)
    //    ctx: ptr[out, io_ctx] {
    //      io_ctx (resource)
    //    }
    //  ]
    res = syscall(__NR_io_setup, /*n=*/7, /*ctx=*/0x200000000280ul);
    if (res != -1)
      r[1] = *(uint64_t*)0x200000000280;
    break;
  case 3:
    //  io_submit arguments: [
    //    ctx: io_ctx (resource)
    //    nr: len = 0x2 (8 bytes)
    //    iocbpp: ptr[in, array[ptr[in, iocb]]] {
    //      array[ptr[in, iocb]] {
    //        ptr[in, iocb] {
    //          iocb {
    //            aio_data: const = 0x0 (8 bytes)
    //            aio_key: const = 0x0 (4 bytes)
    //            aio_rw_flags: const = 0x0 (4 bytes)
    //            aio_lio_opcode: lio_opcode = 0x7 (2 bytes)
    //            aio_reqprio: int16 = 0xfffe (2 bytes)
    //            aio_fildes: fd (resource)
    //            aio_buf: nil
    //            aio_nbytes: len = 0x0 (8 bytes)
    //            aio_offset: int64 = 0x0 (8 bytes)
    //            aio_reserved2: const = 0x0 (8 bytes)
    //            aio_flags: iocb_flags = 0x0 (4 bytes)
    //            aio_resfd: fd_event (resource)
    //          }
    //        }
    //        nil
    //      }
    //    }
    //  ]
    *(uint64_t*)0x200000000200 = 0x200000000000;
    *(uint64_t*)0x200000000000 = 0;
    *(uint32_t*)0x200000000008 = 0;
    *(uint32_t*)0x20000000000c = 0;
    *(uint16_t*)0x200000000010 = 7;
    *(uint16_t*)0x200000000012 = 0xfffe;
    *(uint32_t*)0x200000000014 = r[0];
    *(uint64_t*)0x200000000018 = 0;
    *(uint64_t*)0x200000000020 = 0;
    *(uint64_t*)0x200000000028 = 0;
    *(uint64_t*)0x200000000030 = 0;
    *(uint32_t*)0x200000000038 = 0;
    *(uint32_t*)0x20000000003c = -1;
    *(uint64_t*)0x200000000208 = 0;
    syscall(__NR_io_submit, /*ctx=*/r[1], /*nr=*/2ul,
            /*iocbpp=*/0x200000000200ul);
    break;
  case 4:
    //  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*)0x200000000000, "./sys\000", 6);
    syscall(
        __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000000ul,
        /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
        0x1fful);
    break;
  case 5:
    //  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*)0x200000000080, "./sys\000", 6);
    memcpy((void*)0x2000000000c0, "sysfs\000", 6);
    syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000000080ul,
            /*type=*/0x2000000000c0ul, /*flags=*/0ul, /*data=*/0ul);
    break;
  case 6:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 73 79 73 2f 62 75 73 2f 73 65 72 69 6f 2f 64 65 76 69
    //      63 65 73 2f 73 65 72 69 6f 30 2f 64 72 76 63 74 6c 00} (length 0x26)
    //    }
    //    flags: open_flags = 0x1 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x200000000100, "./sys/bus/serio/devices/serio0/drvctl\000",
           38);
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000100ul,
                  /*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: {61 74 6b 62 64} (length 0x5)
    //    }
    //    count: len = 0x5 (8 bytes)
    //  ]
    memcpy((void*)0x200000000200, "atkbd", 5);
    syscall(__NR_write, /*fd=*/r[2], /*buf=*/0x200000000200ul, /*count=*/5ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*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=*/0x200001000000ul, /*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;
}