// https://syzkaller.appspot.com/bug?id=101b7e71f53b37caf00bf159bd293d6d6512242a
// 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>

#ifndef __NR_mknodat
#define __NR_mknodat 33
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mount
#define __NR_mount 40
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif

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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x200000c0, "./file2\000", 8);
  syscall(__NR_mknodat, /*dirfd=*/0xffffff9c, /*file=*/0x200000c0ul,
          /*mode=S_IFREG|0x1c0*/ 0x81c0ul, /*dev=*/0);
  memcpy((void*)0x20000100, "cpuset.effective_cpus\000", 22);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000100ul,
                /*flags=*/0x275aul, /*mode=*/0ul);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000100, "cpuset.effective_cpus\000", 22);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000100ul,
                /*flags=*/0x275aul, /*mode=*/0ul);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000740, "./file2\000", 8);
  memcpy((void*)0x20000780, "9p\000", 3);
  memcpy((void*)0x20002a80, "trans=fd,rfdno=", 15);
  sprintf((char*)0x20002a8f, "0x%016llx", (long long)r[1]);
  memcpy((void*)0x20002aa1, ",wfdno=", 7);
  sprintf((char*)0x20002aa8, "0x%016llx", (long long)r[0]);
  memcpy((void*)0x20002aba,
         "\x2c\x01\x00\x6c\x74\x75\x69\x64\x3d\x62\x65\x85\xbb\x84\x31\x54\x0f"
         "\xe5\x62\xcb\xeb\x56\x48\xb7\x0d\x98\x96\xb8\xa7\x85\xae\xe7\x82\xb0"
         "\x3f\x8c\x3a\x7f\xa3\x64\xd5\x96\x39\x25\xb9\x02\x26\x64\x9f\x17\xa9"
         "\xf5\x88\x3c\x25\x3d\x60\xee\x1d\x1b\x46\xd4\x75\xe3\x5c\x19\xbc\xfa"
         "\x1c\xaf\xa5\x34\x8c\xea\xfb\x7e\x16\xba\x4a\xed\x95\x39\xd0\xa5\xcb"
         "\xba\x09\x29\x4e\xe8\x16\x29\x78\xe4\x2c\x23\x13\xa8\x55\x84\x0d\xd6"
         "\x07\x5d\x4b\x0a\x24\xff\x31\x73\x85\x6c\x26\x26\x73\xa7\xd8\x46\xf6"
         "\x67\xef\xdd\x46\xc9\x7e\x49\xd5\xe9\x05\xcd\x03\x5e\xef\x31\x21\x64"
         "\x55\xca\x6c\xf8\x72\xe9\x9a\x6c\xe1",
         145);
  sprintf((char*)0x20002b4b, "0x%016llx", (long long)-1);
  sprintf((char*)0x20002b5d, "0x%016llx", (long long)0xee01);
  sprintf((char*)0x20002b6f, "%020llu", (long long)0xee01);
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x20000740ul, /*type=*/0x20000780ul,
          /*flags=MS_STRICTATIME*/ 0x1000000ul, /*opts=*/0x20002a80ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  loop();
  return 0;
}