// https://syzkaller.appspot.com/bug?id=d5f63be97bcf572595613d19f9b82475e37c9026
// 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/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_bpf
#define __NR_bpf 321
#endif

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 < 6; 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);
      if (call == 3)
        break;
      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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    *(uint32_t*)0x200000000000 = 1;
    *(uint32_t*)0x200000000004 = 8;
    *(uint64_t*)0x200000000008 = 0x200000000780;
    memcpy(
        (void*)0x200000000780,
        "\x7a\x0a\xf8\xff\x75\x25\x70\x00\xbf\xa1\x00\x00\x00\x00\x00\x00\x07"
        "\x01\x00\x00\xf8\xff\xff\xff\xb7\x02\x00\x00\x05\x00\x00\x00\xbf\x13"
        "\x00\x00\x00\x00\x00\x00\x85\x00\x00\x00\x7d\x00\x00\x00\xb7\x00\x00"
        "\x00\x00\x00\x00\x00\x95\x00\x00\xff\x00\x00\x00\x00\xb2\x59\x52\x85"
        "\x0a\x84\xa7\x00\x02\xb2\xab\x3d\x6f\xfa\xa6\xea\xd0\x16\x91\x91\xd5"
        "\x4f\x81\x96\x21\x7f\xc5\x63\xe2\xfc\x91\xf6\xda\x4d\xad\x4f\xdc\x2e"
        "\xb1\xb5\x98\x6f\xc4\x4b\xc2\x5f\xb5\x91\xcf\x77\xb9\xdf\xb3\x79\xa3"
        "\xf6\x11\xdb\xc2\xa3\x64\x91\x6f\x09\x8d\xab\x10\xb1\xa2\x97\xcf\x52"
        "\x86\x66\xd1\xdd\xd7\x3f\x30\xf2\x38\x2f\x6c\xda\x4b\xfd\xd4\x5b\xe5"
        "\x83\x82\x3c\x0f\x09\x22\x48\xa5\x7d\x48\x62\x1f\x3c\x1c\x65\xee\x19"
        "\xee\x87\x5d\xaf\x45\x00\x6a\x4c\x4e\xa5\xe1\x5b\x2f\x96\x18\xd5\x47"
        "\x24\x4a\x22\x00\x00\x00\x00\x08\x00\xdb\x58\x36\x20\xce\x72\x43\xd1"
        "\xae\xbd\xb6\x38\xd9\x1d\xbe\xf6\x61\x93\x58\x39\x9a\xa9\xc2\xac\xd0"
        "\x68\xc0\x3e\xfe\xfd\x8b\xc7\x7e\xdf\x2d\x34\xb1\x2c\xd4\x8a\x1b\x20"
        "\xfb\x7d\xd8\x43\x26\x7e\x03\x31\x75\x9f\x4e\xc6\xb5\xb0\xaf\x58\xe6"
        "\x04\xf4\x94\xef\xf2\x89\x02\x6d\x50\x45\xef\x08\x00\x00\x00\x00\x00"
        "\x00\x00\x77\x18\xa0\x9f\x48\x86\xaf\xc2\x6a\xbb\xa3\x46\x35\xd0\xe8"
        "\xb5\x98\xa5\x1b\xc7\x42\x13\x5a\x6e\x1d\x33\xfe\x22\x6c\x94\x4b\xc7"
        "\x6b\xe4\x0d\x43\x5a\xa8\xb5\x20\x2d\xb7\x61\x01\x4b\x1b\x99\x9a\x12"
        "\xdf\x6b\xee\x43\x1a\x66\x81\x00\x00\x00\x26\x3b\x62\x33\xe1\xc0\xfe"
        "\x30\xe3\x84\xc3\xcb\x07\xb7\x4a\x72\x29\x1a\x1a\x2b\x52\x3d\xd8\x1b"
        "\x66\x51\xb1\xee\x48\xe9\x99\xbb\x00\x48\x23\xeb\xcd\x8c\x65\x74\x3f"
        "\x31\xf8\x4b\x26\x3a\xb9\xb3\x42\x66\x92\xd0\x1a\xd1\x94\xf3\x02\xd7"
        "\xa6\x58\xe9\xe5\x46\x87\xd3\xc5\x6d\x7b\xed\xb6\xb2\xf2\x5d\xdb\x8c"
        "\x64\x0b\xb3\x21\xa4\x02\x05\x8c\x92\x21\xb6\x87\x08\x14\xcf\x4e\xe2"
        "\x3d\xdb\x79\xff\xf5\xeb\x15\x6e\x0a\x00\x00\x00\x00\x00\x00\xf2\xbd"
        "\x1d\x4a\x17\x8d\x86\xd6\x93\x5e\xb8\xb7\x5b\xc4\xeb\x68\x0d\x10\xe8"
        "\xb6\xa5\x4c\x6c\x86\x74\xca\xf6\x3f\xf7\x66\x22\x93\x9a\x20\xd4\xaa"
        "\xdf\x85\xdb\x40\x17\x9c\x2c\xf8\x3e\xe0\x7e\x30\xa2\x79\xd8\xf9\xf3"
        "\xbc\x28\x2d\xeb\x43\xa0\x34\x09\xf8\xe6\x97\x2f\x3f\x72\x0d\x04\x59"
        "\x23\x70\x2c\xed\xe0\xf3\xe9\x14\x11\xf3\xf1\xb1\x6f\x06\x56\x24\xf2"
        "\x80\xa7\xdc\xce\x8d\xb9\x10\xf9\x3c\x49\xb9\xe0\xb6\xdd\x73\x56\xaa"
        "\x79\xd5\xfa\xbb\x5c\x0d\x0d\xa6\xd7\x19\xd7\xe0\xef\xb2\xbb\x71\x3d"
        "\x18\x24\x2c\xd5\xdf\x6c\xa5\x33\x07\xa4\xcd\xd9\x1b\xe4\x58\x7f\x90"
        "\xe3\x17\xc8\xde\x5e\x5c\x39\x33\xfd\x5d\x5b\xf3\x8f\x6b\x9f\xc3\x9f"
        "\xc8\x29\xdc\xfe\x4a\xf8\xac\x5f\xbb\x73\x14\xa7\xa4\x33\xe0\x18\x27"
        "\x67\xd1\x78\x6e\xda\x2b\x20",
        619);
    *(uint64_t*)0x200000000010 = 0x200000000100;
    memcpy((void*)0x200000000100, "GPL\000", 4);
    *(uint32_t*)0x200000000018 = 0;
    *(uint32_t*)0x20000000001c = 0;
    *(uint64_t*)0x200000000020 = 0;
    *(uint32_t*)0x200000000028 = 0;
    *(uint32_t*)0x20000000002c = 0;
    memset((void*)0x200000000030, 0, 16);
    *(uint32_t*)0x200000000040 = 0;
    *(uint32_t*)0x200000000044 = 0;
    *(uint32_t*)0x200000000048 = -1;
    *(uint32_t*)0x20000000004c = 8;
    *(uint64_t*)0x200000000050 = 0;
    *(uint32_t*)0x200000000058 = 0;
    *(uint32_t*)0x20000000005c = 0x10;
    *(uint64_t*)0x200000000060 = 0;
    *(uint32_t*)0x200000000068 = 0;
    *(uint32_t*)0x20000000006c = 0;
    *(uint32_t*)0x200000000070 = -1;
    *(uint32_t*)0x200000000074 = 0;
    *(uint64_t*)0x200000000078 = 0;
    *(uint64_t*)0x200000000080 = 0;
    *(uint32_t*)0x200000000088 = 0x10;
    *(uint32_t*)0x20000000008c = 0;
    *(uint32_t*)0x200000000090 = 0;
    res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000000ul,
                  /*size=*/0x48ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    res = syscall(__NR_socketpair, /*domain=*/1ul, /*type=SOCK_DGRAM*/ 2ul,
                  /*proto=*/0, /*fds=*/0x200000000080ul);
    if (res != -1)
      r[1] = *(uint32_t*)0x200000000080;
    break;
  case 2:
    memcpy((void*)0x2000000002c0,
           "\x03\x00\x00\x00\x04\x00\x00\x00\x04\x00\x00\x00\x0a", 13);
    res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x2000000002c0ul,
                  /*size=*/0x48ul);
    if (res != -1)
      r[2] = res;
    break;
  case 3:
    *(uint32_t*)0x200000000280 = r[2];
    *(uint64_t*)0x200000000288 = 0x200000000200;
    *(uint32_t*)0x200000000200 = 0;
    *(uint64_t*)0x200000000290 = 0x200000000240;
    *(uint32_t*)0x200000000240 = r[0];
    *(uint64_t*)0x200000000298 = 0;
    syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x200000000280ul, /*size=*/0x20ul);
    break;
  case 4:
    *(uint32_t*)0x200000000880 = 1;
    *(uint32_t*)0x200000000884 = 0x10;
    *(uint64_t*)0x200000000888 = 0x200000000bc0;
    memcpy((void*)0x200000000bc0,
           "\x18\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x18\x12\x00\x00",
           20);
    *(uint32_t*)0x200000000bd4 = r[2];
    memcpy(
        (void*)0x200000000bd8,
        "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x03\x00\x00\x00\x00\x00\x00\x85"
        "\x00\x00\x00\x0c\x00\x00\x00\xb7\x00\x00\x00\x00\x00\x00\x00\x18\x01"
        "\x00\x00\x00\x08\x2c\x25\x00\x00\x00\x00\x00\x21\x20\x20\x7b\x1a\xf8"
        "\xff\x00\x00\x00\x00\xbf\xa1\x00\x00\x00\x00\x00\x00\x07\x01\x00\x00"
        "\xf8\xff\xff\xff\xb7\x02\x00\x00\x08\x00\x00\x00\xb7\x03\x00\x00\x00"
        "\x00\x00\x00\x85\x00\x00\x00\x07\x00\x00\x00\x95",
        97);
    *(uint64_t*)0x200000000890 = 0x200000000980;
    memcpy((void*)0x200000000980, "GPL\000", 4);
    *(uint32_t*)0x200000000898 = 0;
    *(uint32_t*)0x20000000089c = 0;
    *(uint64_t*)0x2000000008a0 = 0;
    *(uint32_t*)0x2000000008a8 = 0;
    *(uint32_t*)0x2000000008ac = 0;
    memset((void*)0x2000000008b0, 0, 16);
    *(uint32_t*)0x2000000008c0 = 0;
    *(uint32_t*)0x2000000008c4 = 0;
    *(uint32_t*)0x2000000008c8 = -1;
    *(uint32_t*)0x2000000008cc = 0;
    *(uint64_t*)0x2000000008d0 = 0;
    *(uint32_t*)0x2000000008d8 = 0;
    *(uint32_t*)0x2000000008dc = 0;
    *(uint64_t*)0x2000000008e0 = 0;
    *(uint32_t*)0x2000000008e8 = 0;
    *(uint32_t*)0x2000000008ec = 0;
    *(uint32_t*)0x2000000008f0 = 0;
    *(uint32_t*)0x2000000008f4 = 0;
    *(uint64_t*)0x2000000008f8 = 0;
    *(uint64_t*)0x200000000900 = 0;
    *(uint32_t*)0x200000000908 = 0;
    *(uint32_t*)0x20000000090c = 0;
    *(uint32_t*)0x200000000910 = 0;
    res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000880ul,
                  /*size=*/0x90ul);
    if (res != -1)
      r[3] = res;
    break;
  case 5:
    *(uint32_t*)0x2000000000c0 = r[3];
    syscall(__NR_setsockopt, /*fd=*/r[1], /*level=*/1, /*optname=*/0x32,
            /*optval=*/0x2000000000c0ul, /*optlen=*/4ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*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=*/0x1000ul, /*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;
}