// https://syzkaller.appspot.com/bug?id=e6ea4a97f963d77dc94e7a1e6524b78bbc8636b0
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void exitf(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

static void use_temporary_dir()
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    fail("failed to mkdtemp");
  if (chmod(tmpdir, 0777))
    fail("failed to chmod");
  if (chdir(tmpdir))
    fail("failed to chdir");
}

static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t 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 {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 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 setup_cgroups()
{
  if (mkdir("/syzcgroup", 0777)) {
  }
  if (mkdir("/syzcgroup/unified", 0777)) {
  }
  if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) {
  }
  if (chmod("/syzcgroup/unified", 0777)) {
  }
  if (!write_file("/syzcgroup/unified/cgroup.subtree_control",
                  "+cpu +memory +io +pids +rdma")) {
  }
  if (mkdir("/syzcgroup/cpu", 0777)) {
  }
  if (mount("none", "/syzcgroup/cpu", "cgroup", 0,
            "cpuset,cpuacct,perf_event,hugetlb")) {
  }
  if (!write_file("/syzcgroup/cpu/cgroup.clone_children", "1")) {
  }
  if (chmod("/syzcgroup/cpu", 0777)) {
  }
  if (mkdir("/syzcgroup/net", 0777)) {
  }
  if (mount("none", "/syzcgroup/net", "cgroup", 0,
            "net_cls,net_prio,devices,freezer")) {
  }
  if (chmod("/syzcgroup/net", 0777)) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  setup_cgroups();
  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }

  loop();
  doexit(1);
}

static int inject_fault(int nth)
{
  int fd;
  char buf[16];

  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exitf("failed to open /proc/thread-self/fail-nth");
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exitf("failed to write /proc/thread-self/fail-nth");
  return fd;
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[2] = {0x0, 0xffffffffffffffff};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    memcpy((void*)0x200001c0, "./file0", 8);
    syscall(__NR_mkdir, 0x200001c0, 0);
    break;
  case 1:
    memcpy((void*)0x20000400, "/dev/usbmon#", 13);
    syz_open_dev(0x20000400, 0, 0);
    break;
  case 2:
    *(uint32_t*)0x20223000 = 2;
    *(uint32_t*)0x20223004 = 0x78;
    *(uint8_t*)0x20223008 = 0xe3;
    *(uint8_t*)0x20223009 = 0;
    *(uint8_t*)0x2022300a = 0;
    *(uint8_t*)0x2022300b = 0;
    *(uint32_t*)0x2022300c = 0;
    *(uint64_t*)0x20223010 = 0;
    *(uint64_t*)0x20223018 = 0;
    *(uint64_t*)0x20223020 = 0;
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 1, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 1, 5, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 10, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 22, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 24, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 27, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, 0x20223028, 0, 29, 35);
    *(uint32_t*)0x20223030 = 0;
    *(uint32_t*)0x20223034 = 0;
    *(uint64_t*)0x20223038 = 0x20000000;
    *(uint64_t*)0x20223040 = 0;
    *(uint64_t*)0x20223048 = 0;
    *(uint64_t*)0x20223050 = 0;
    *(uint32_t*)0x20223058 = 0;
    *(uint32_t*)0x2022305c = 0;
    *(uint64_t*)0x20223060 = 0;
    *(uint32_t*)0x20223068 = 0;
    *(uint16_t*)0x2022306c = 0;
    *(uint16_t*)0x2022306e = 0;
    syscall(__NR_perf_event_open, 0x20223000, 0, 0, -1, 0);
    break;
  case 3:
    *(uint32_t*)0x20001a80 = 0xe8;
    res = syscall(__NR_getsockopt, -1, 0, 0x10, 0x20001980, 0x20001a80);
    if (res != -1)
      r[0] = *(uint32_t*)0x200019b4;
    break;
  case 4:
    memcpy((void*)0x200004c0, "./file0", 8);
    syscall(__NR_chown, 0x200004c0, r[0], 0);
    break;
  case 5:
    memcpy((void*)0x200003c0, "./file0", 8);
    memcpy((void*)0x20000380, "./file0", 8);
    memcpy((void*)0x20000300, "cgroup2", 8);
    syscall(__NR_mount, 0x200003c0, 0x20000380, 0x20000300, 0, 0);
    break;
  case 6:
    memcpy((void*)0x2001bff4, "./file0", 8);
    res = syscall(__NR_open, 0x2001bff4, 0, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 7:
    memcpy((void*)0x20000280, "./file0", 8);
    write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
    write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
    inject_fault(52);
    syscall(__NR_mkdirat, r[1], 0x20000280, 0x20);
    break;
  case 8:
    memcpy((void*)0x20000180, "./file0", 8);
    syscall(__NR_open, 0x20000180, 0, 0);
    break;
  }
}

void loop()
{
  execute(9);
  collide = 1;
  execute(9);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  use_temporary_dir();
  int pid = do_sandbox_none();
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}