// https://syzkaller.appspot.com/bug?id=a133db4b32d89957481e21b5080f9edfa3bf4359
// 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 setup_sysctl()
{
  char mypid[32];
  snprintf(mypid, sizeof(mypid), "%d", getpid());
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", mypid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data))
      printf("write to %s failed: %s\n", files[i].name, strerror(errno));
  }
}

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

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x20000180, "./file0\000", 8);
  syscall(__NR_mkdir, 0x20000180ul, 0ul);
  res = syscall(__NR_pipe2, 0x20000240ul, 0ul);
  if (res != -1) {
    r[0] = *(uint32_t*)0x20000240;
    r[1] = *(uint32_t*)0x20000244;
  }
  memcpy((void*)0x200003c0,
         "\x15\x00\x00\x00\x65\xff\xff\x01\x84\x00\x11\x08\x00\x39\x50\x32\x30"
         "\x30\x30",
         19);
  syscall(__NR_write, r[1], 0x200003c0ul, 0x15ul);
  res = syscall(__NR_dup, r[1]);
  if (res != -1)
    r[2] = res;
  *(uint32_t*)0x20000080 = 0x18;
  *(uint32_t*)0x20000084 = 0;
  *(uint64_t*)0x20000088 = 0;
  *(uint64_t*)0x20000090 = 0;
  syscall(__NR_write, r[2], 0x20000080ul, 0x18ul);
  *(uint32_t*)0x200000c0 = 0x14c;
  *(uint32_t*)0x200000c4 = 5;
  *(uint64_t*)0x200000c8 = 0;
  *(uint64_t*)0x200000d0 = 0;
  *(uint64_t*)0x200000d8 = 0;
  *(uint64_t*)0x200000e0 = 0;
  *(uint32_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000ec = 0;
  syscall(__NR_write, r[2], 0x200000c0ul, 0x137ul);
  *(uint32_t*)0x20000280 = 0x69;
  *(uint8_t*)0x20000284 = 0x7d;
  *(uint16_t*)0x20000285 = 2;
  *(uint16_t*)0x20000287 = 0;
  *(uint16_t*)0x20000289 = 0x51;
  *(uint16_t*)0x2000028b = 0x8000;
  *(uint32_t*)0x2000028d = -1;
  *(uint8_t*)0x20000291 = 0x80;
  *(uint32_t*)0x20000292 = 5;
  *(uint64_t*)0x20000296 = 7;
  *(uint32_t*)0x2000029e = 0x3100000;
  *(uint32_t*)0x200002a2 = 3;
  *(uint32_t*)0x200002a6 = 0;
  *(uint64_t*)0x200002aa = 0x7f;
  *(uint16_t*)0x200002b2 = 3;
  memcpy((void*)0x200002b4, "9p\000", 3);
  *(uint16_t*)0x200002b7 = 6;
  memcpy((void*)0x200002b9, ")\'-])\'", 6);
  *(uint16_t*)0x200002bf = 3;
  memcpy((void*)0x200002c1, "9p\000", 3);
  *(uint16_t*)0x200002c4 = 0x12;
  memcpy((void*)0x200002c6, "$-{&\'-)-&():@(*(/!", 18);
  *(uint16_t*)0x200002d8 = 3;
  memcpy((void*)0x200002da, "9p\000", 3);
  *(uint32_t*)0x200002dd = -1;
  *(uint32_t*)0x200002e1 = 0;
  *(uint32_t*)0x200002e5 = -1;
  syscall(__NR_write, r[2], 0x20000280ul, 0x69ul);
  memcpy((void*)0x20000000, "./file0\000", 8);
  memcpy((void*)0x20000200, "9p\000", 3);
  memcpy((void*)0x20000600, "trans=fd,rfdno=", 15);
  sprintf((char*)0x2000060f, "0x%016llx", (long long)r[0]);
  memcpy((void*)0x20000621, ",wfdno=", 7);
  sprintf((char*)0x20000628, "0x%016llx", (long long)r[1]);
  syscall(__NR_mount, 0ul, 0x20000000ul, 0x20000200ul, 0ul, 0x20000600ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  setup_sysctl();
  loop();
  return 0;
}