// https://syzkaller.appspot.com/bug?id=8aa6edf73efcad3a97b234016a4328792eea9f5c
// 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>

static unsigned long long procid;

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 < 10; 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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  socket$inet_tcp arguments: [
    //    domain: const = 0x2 (8 bytes)
    //    type: const = 0x1 (8 bytes)
    //    proto: const = 0x0 (4 bytes)
    //  ]
    //  returns sock_tcp
    res = syscall(__NR_socket, /*domain=*/2ul, /*type=*/1ul, /*proto=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  bind$inet arguments: [
    //    fd: sock_in (resource)
    //    addr: ptr[in, sockaddr_in] {
    //      sockaddr_in {
    //        family: const = 0x2 (2 bytes)
    //        port: int16be = 0x4e20 (2 bytes)
    //        addr: union ipv4_addr {
    //          loopback: const = 0x7f000001 (4 bytes)
    //        }
    //        pad = 0x0 (8 bytes)
    //      }
    //    }
    //    addrlen: len = 0x10 (8 bytes)
    //  ]
    *(uint16_t*)0x200000000000 = 2;
    *(uint16_t*)0x200000000002 = htobe16(0x4e20);
    *(uint32_t*)0x200000000004 = htobe32(0x7f000001);
    syscall(__NR_bind, /*fd=*/r[0], /*addr=*/0x200000000000ul,
            /*addrlen=*/0x10ul);
    break;
  case 2:
    //  listen arguments: [
    //    fd: sock (resource)
    //    backlog: int32 = 0x10 (4 bytes)
    //  ]
    syscall(__NR_listen, /*fd=*/r[0], /*backlog=*/0x10);
    break;
  case 3:
    //  mkdirat arguments: [
    //    fd: fd_dir (resource)
    //    path: ptr[in, buffer] {
    //      buffer: {2e 2f 63 69 66 73 00} (length 0x7)
    //    }
    //    mode: open_mode = 0x1ff (8 bytes)
    //  ]
    memcpy((void*)0x200000000100, "./cifs\000", 7);
    syscall(
        __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000100ul,
        /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
        0x1fful);
    break;
  case 4:
    //  mount arguments: [
    //    src: ptr[in, blockdev_filename] {
    //      union blockdev_filename {
    //        filename: buffer: {5c 5c 31 32 37 2e 30 2e 30 2e 31 5c 73 68 61 72
    //        65 00} (length 0x12)
    //      }
    //    }
    //    dst: ptr[in, buffer] {
    //      buffer: {2e 2f 63 69 66 73 00} (length 0x7)
    //    }
    //    type: ptr[in, buffer] {
    //      buffer: {63 69 66 73 00} (length 0x5)
    //    }
    //    flags: mount_flags = 0x0 (8 bytes)
    //    data: ptr[in, buffer] {
    //      buffer: {75 6e 63 3d 2f 2f 31 32 37 2e 30 2e 30 2e 31 2f 73 68 61 72
    //      65 2c 69 70 3d 31 32 37 2e 30 2e 30 2e 31 2c 70 6f 72 74 3d 32 30 30
    //      30 30 2c 75 73 65 72 3d 72 6f 6f 74 2c 70 61 73 73 3d 72 6f 6f 74 2c
    //      76 65 72 73 3d 33 2e 30 2c 6e 6f 64 66 73 00} (length 0x51)
    //    }
    //  ]
    memcpy((void*)0x200000000500, "\\\\127.0.0.1\\share\000", 18);
    memcpy((void*)0x200000000100, "./cifs\000", 7);
    memcpy((void*)0x200000000200, "cifs\000", 5);
    memcpy(
        (void*)0x200000000300,
        "unc=//127.0.0.1/"
        "share,ip=127.0.0.1,port=20000,user=root,pass=root,vers=3.0,nodfs\000",
        81);
    syscall(__NR_mount, /*src=*/0x200000000500ul, /*dst=*/0x200000000100ul,
            /*type=*/0x200000000200ul, /*flags=*/0ul,
            /*data=*/0x200000000300ul);
    break;
  case 5:
    //  accept arguments: [
    //    fd: sock (resource)
    //    peer: nil
    //    peerlen: nil
    //  ]
    //  returns sock
    res = syscall(__NR_accept, /*fd=*/r[0], /*peer=*/0ul, /*peerlen=*/0ul);
    if (res != -1)
      r[1] = res;
    break;
  case 6:
    //  sendto$inet arguments: [
    //    fd: sock_in (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {00 00 00 80 fe 53 4d 42 40 00 01 00 00 00 00 00 00 00 01 00
    //      01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    //      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    //      00 00 41 00 01 00 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    //      00 00 00 00 00 00 00 00 00 10 00 00 00 10 00 00 00 10 00 00 00 00 00
    //      00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00}
    //      (length 0x86)
    //    }
    //    len: len = 0x84 (8 bytes)
    //    f: send_flags = 0x0 (8 bytes)
    //    addr: nil
    //    addrlen: len = 0x0 (8 bytes)
    //  ]
    memcpy(
        (void*)0x200000002000,
        "\x00\x00\x00\x80\xfe\x53\x4d\x42\x40\x00\x01\x00\x00\x00\x00\x00\x00"
        "\x00\x01\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x41\x00\x01\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10\x00\x00\x00"
        "\x10\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00",
        134);
    syscall(__NR_sendto, /*fd=*/r[1], /*buf=*/0x200000002000ul, /*len=*/0x84ul,
            /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  case 7:
    //  sendto$inet arguments: [
    //    fd: sock_in (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {} (length 0x0)
    //    }
    //    len: len = 0x0 (8 bytes)
    //    f: send_flags = 0x0 (8 bytes)
    //    addr: nil
    //    addrlen: len = 0x0 (8 bytes)
    //  ]
    syscall(__NR_sendto, /*fd=*/r[1], /*buf=*/0x200000002100ul, /*len=*/0ul,
            /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  case 8:
    //  ioctl$CEC_ADAP_S_LOG_ADDRS arguments: [
    //    fd: fd_cec (resource)
    //    cmd: const = 0xc05c6104 (4 bytes)
    //    arg: ptr[inout, cec_log_addrs] {
    //      cec_log_addrs {
    //        log_addr: buffer: {44 97 ac f4} (length 0x4)
    //        log_addr_mask: int16 = 0xb (2 bytes)
    //        cec_version: int8 = 0x4 (1 bytes)
    //        num_log_addrs: int8 = 0x0 (1 bytes)
    //        vendor_id: int32 = 0x3 (4 bytes)
    //        flags: int32 = 0x1000006 (4 bytes)
    //        osd_name: buffer: {55 00 57 8e a5 f4 ff ff ff eb 00 00 10 00 00}
    //        (length 0xf) primary_device_type: buffer: {15 75 b8 59} (length
    //        0x4) log_addr_type: buffer: {00 00 00 00} (length 0x4)
    //        all_device_types: buffer: {27 71 36 4f} (length 0x4)
    //        features: array[buffer] {
    //          buffer: {aa be 84 59 c6 22 24 47 57 93 e8 a7} (length 0xc)
    //          buffer: {7f 9c e2 d2 c4 f4 39 ff 80 e1 d1 c8} (length 0xc)
    //          buffer: {fa 07 00 f2 2b 42 a3 02 3b e5 16 d1} (length 0xc)
    //          buffer: {00 00 00 00 00 00 00 00 00 00 00 00} (length 0xc)
    //        }
    //        pad = 0x0 (1 bytes)
    //      }
    //    }
    //  ]
    memcpy((void*)0x200000000140, "\x44\x97\xac\xf4", 4);
    *(uint16_t*)0x200000000144 = 0xb;
    *(uint8_t*)0x200000000146 = 4;
    *(uint8_t*)0x200000000147 = 0;
    *(uint32_t*)0x200000000148 = 3;
    *(uint32_t*)0x20000000014c = 0x1000006;
    memcpy((void*)0x200000000150,
           "\x55\x00\x57\x8e\xa5\xf4\xff\xff\xff\xeb\x00\x00\x10\x00\x00", 15);
    memcpy((void*)0x20000000015f, "\x15\x75\xb8\x59", 4);
    memset((void*)0x200000000163, 0, 4);
    memcpy((void*)0x200000000167, "\'q6O", 4);
    memcpy((void*)0x20000000016b,
           "\xaa\xbe\x84\x59\xc6\x22\x24\x47\x57\x93\xe8\xa7", 12);
    memcpy((void*)0x200000000177,
           "\x7f\x9c\xe2\xd2\xc4\xf4\x39\xff\x80\xe1\xd1\xc8", 12);
    memcpy((void*)0x200000000183,
           "\xfa\x07\x00\xf2\x2b\x42\xa3\x02\x3b\xe5\x16\xd1", 12);
    memset((void*)0x20000000018f, 0, 12);
    syscall(__NR_ioctl, /*fd=*/(intptr_t)-1, /*cmd=*/0xc05c6104,
            /*arg=*/0x200000000140ul);
    break;
  case 9:
    //  close arguments: [
    //    fd: fd (resource)
    //  ]
    syscall(__NR_close, /*fd=*/r[1]);
    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;
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}