// https://syzkaller.appspot.com/bug?id=f8a9a09118fe9aaab79c12a31af419e3a34a4fd3
// 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 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[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$fuse arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 66 75 73 65 00} (length 0xa)
  //    }
  //    flags: const = 0x2 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_fuse
  memcpy((void*)0x200000000140, "/dev/fuse\000", 10);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000140ul, /*flags=*/2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  mount$fuse arguments: [
  //    src: const = 0x0 (8 bytes)
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 00} (length 0x2)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {66 75 73 65 00} (length 0x5)
  //    }
  //    flags: mount_flags = 0x4001 (8 bytes)
  //    opts: ptr[in, fuse_options] {
  //      fuse_options {
  //        fd: fs_opt["fd", fmt[hex, fd_fuse]] {
  //          name: buffer: {66 64} (length 0x2)
  //          eq: const = 0x3d (1 bytes)
  //          val: fd_fuse (resource)
  //        }
  //        comma0: const = 0x2c (1 bytes)
  //        rootmode: fs_opt["rootmode", fmt[oct, flags[fuse_mode]]] {
  //          name: buffer: {72 6f 6f 74 6d 6f 64 65} (length 0x8)
  //          eq: const = 0x3d (1 bytes)
  //          val: fuse_mode = 0x4000 (23 bytes)
  //        }
  //        comma1: const = 0x2c (1 bytes)
  //        user_id: fs_opt["user_id", fmt[dec, uid]] {
  //          name: buffer: {75 73 65 72 5f 69 64} (length 0x7)
  //          eq: const = 0x3d (1 bytes)
  //          val: uid (resource)
  //        }
  //        comma2: const = 0x2c (1 bytes)
  //        group_id: fs_opt["group_id", fmt[dec, gid]] {
  //          name: buffer: {67 72 6f 75 70 5f 69 64} (length 0x8)
  //          eq: const = 0x3d (1 bytes)
  //          val: gid (resource)
  //        }
  //        comma3: const = 0x2c (1 bytes)
  //        opts: fs_options[fuse_opts] {
  //          elems: array[fs_opt_elem[fuse_opts]] {
  //          }
  //          common: array[fs_opt_elem[fs_options_common]] {
  //          }
  //          null: const = 0x0 (1 bytes)
  //        }
  //      }
  //    }
  //  ]
  memcpy((void*)0x200000002880, ".\000", 2);
  memcpy((void*)0x2000000028c0, "fuse\000", 5);
  memcpy((void*)0x2000000000c0, "fd", 2);
  *(uint8_t*)0x2000000000c2 = 0x3d;
  sprintf((char*)0x2000000000c3, "0x%016llx", (long long)r[0]);
  *(uint8_t*)0x2000000000d5 = 0x2c;
  memcpy((void*)0x2000000000d6, "rootmode", 8);
  *(uint8_t*)0x2000000000de = 0x3d;
  sprintf((char*)0x2000000000df, "%023llo", (long long)0x4000);
  *(uint8_t*)0x2000000000f6 = 0x2c;
  memcpy((void*)0x2000000000f7, "user_id", 7);
  *(uint8_t*)0x2000000000fe = 0x3d;
  sprintf((char*)0x2000000000ff, "%020llu", (long long)0);
  *(uint8_t*)0x200000000113 = 0x2c;
  memcpy((void*)0x200000000114, "group_id", 8);
  *(uint8_t*)0x20000000011c = 0x3d;
  sprintf((char*)0x20000000011d, "%020llu", (long long)0);
  *(uint8_t*)0x200000000131 = 0x2c;
  *(uint8_t*)0x200000000132 = 0;
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000002880ul,
          /*type=*/0x2000000028c0ul, /*flags=MS_REC|MS_RDONLY*/ 0x4001ul,
          /*opts=*/0x2000000000c0ul);
  //  write$FUSE_NOTIFY_STORE arguments: [
  //    fd: fd_fuse (resource)
  //    arg: ptr[in, fuse_notify[FUSE_NOTIFY_STORE, fuse_notify_store_out]] {
  //      fuse_notify[FUSE_NOTIFY_STORE, fuse_notify_store_out] {
  //        len: len = 0x2a (4 bytes)
  //        err: const = 0x4 (4 bytes)
  //        unique: const = 0x0 (8 bytes)
  //        payload: fuse_notify_store_out {
  //          nodeid: int64 = 0x1 (8 bytes)
  //          off: int64 = 0x7fff (8 bytes)
  //          size: len = 0x2 (4 bytes)
  //          padding: const = 0x0 (4 bytes)
  //          data: array[const[0, const]] {
  //            const = 0x0 (1 bytes)
  //            const = 0x0 (1 bytes)
  //          }
  //        }
  //      }
  //    }
  //    len: bytesize = 0x2a (8 bytes)
  //  ]
  *(uint32_t*)0x200000000080 = 0x2a;
  *(uint32_t*)0x200000000084 = 4;
  *(uint64_t*)0x200000000088 = 0;
  *(uint64_t*)0x200000000090 = 1;
  *(uint64_t*)0x200000000098 = 0x7fff;
  *(uint32_t*)0x2000000000a0 = 2;
  *(uint32_t*)0x2000000000a4 = 0;
  *(uint8_t*)0x2000000000a8 = 0;
  *(uint8_t*)0x2000000000a9 = 0;
  syscall(__NR_write, /*fd=*/r[0], /*arg=*/0x200000000080ul, /*len=*/0x2aul);
}
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;
}