// https://syzkaller.appspot.com/bug?id=2b5c671149637e40918f4b5e8cc0a78d3f13e169
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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>

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 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 long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    unsigned long nb = a1;
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(nb % 10);
      nb /= 10;
    }
    return open(buf, a2, 0);
  }
}

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");
}

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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  memcpy((void*)0x200000000080, "/sys/power/resume", 17);
  res = syscall(
      __NR_openat, /*fd=*/0xffffffffffffff9cul, /*dir=*/0x200000000080ul,
      /*flags=O_TRUNC|O_SYNC|O_NONBLOCK|O_NOATIME|O_LARGEFILE|O_EXCL|0x2*/
      0x149a82, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  sprintf((char*)0x200000000040, "0x%016llx", (long long)0x1c8);
  syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x200000000040ul, /*len=*/0xfdeful);
  memcpy((void*)0x200000000000, "/sys/kernel/fscaps", 18);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*dir=*/0x200000000000ul, /*flags=*/0,
                /*mode=S_IXOTH|S_IWOTH|S_IXGRP*/ 0xb);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x200000000440, "/dev/loop#\000", 11);
  res = -1;
  res = syz_open_dev(/*dev=*/0x200000000440, /*id=*/0x81,
                     /*flags=O_TRUNC|O_NONBLOCK|O_EXCL|FASYNC|O_RDWR*/ 0x2a82);
  if (res != -1)
    r[2] = res;
  *(uint32_t*)0x200000000140 = r[1];
  *(uint32_t*)0x200000000144 = 0x800;
  *(uint64_t*)0x200000000148 = 0x2a00;
  *(uint64_t*)0x200000000150 = 0x80010000;
  *(uint64_t*)0x200000000158 = 0;
  *(uint64_t*)0x200000000160 = 9;
  *(uint64_t*)0x200000000168 = 0;
  *(uint32_t*)0x200000000170 = 0;
  *(uint32_t*)0x200000000174 = 0;
  *(uint32_t*)0x200000000178 = 0x20;
  *(uint32_t*)0x20000000017c = 0x1c;
  memcpy((void*)0x200000000180,
         "\xfe\xe8\xa2\xab\x78\xfc\x17\x9f\xd1\xf8\xa0\xe9\x1d\xda\xac\xa7\xbd"
         "\x64\x47\xa4\xb4\xe0\x0d\x96\x83\xdd\xa1\xaf\x1e\xa0\x9d\xe2\xb7\xfb"
         "\x0a\x01\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         64);
  memcpy((void*)0x2000000001c0,
         "\x28\x09\xe8\xdb\xe1\x08\x59\x89\x27\x87\x53\x97\xba\xb2\x2d\x00\x00"
         "\xb4\x20\xa9\xc8\x1f\x40\xf0\x5f\x81\x9e\x01\x17\x7d\x3d\x45\x8d\xac"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x3b\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         64);
  memcpy((void*)0x200000000200,
         "\x90\xbe\x8b\x1c\x55\x12\x40\x6c\x7f\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         32);
  *(uint64_t*)0x200000000220 = 4;
  *(uint64_t*)0x200000000228 = 0x40000000000000;
  memset((void*)0x200000000230, 0, 64);
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x4c0a, /*arg=*/0x200000000140ul);
}
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;
  loop();
  return 0;
}