// https://syzkaller.appspot.com/bug?id=de24bb052989af7a72e7bf51895242e5c0fbda94
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/sysmacros.h>
#include <sys/types.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 <string.h>

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

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 uintptr_t syz_fuseblk_mount(uintptr_t a0, uintptr_t a1, uintptr_t a2,
                                   uintptr_t a3, uintptr_t a4, uintptr_t a5,
                                   uintptr_t a6, uintptr_t a7)
{
  uint64_t target = a0;
  uint64_t blkdev = a1;
  uint64_t mode = a2;
  uint64_t uid = a3;
  uint64_t gid = a4;
  uint64_t maxread = a5;
  uint64_t blksize = a6;
  uint64_t flags = a7;

  int fd = open("/dev/fuse", O_RDWR);
  if (fd == -1)
    return fd;
  if (syscall(SYS_mknodat, AT_FDCWD, blkdev, S_IFBLK, makedev(7, 199)))
    return fd;
  char buf[256];
  sprintf(buf, "fd=%d,user_id=%ld,group_id=%ld,rootmode=0%o", fd, (long)uid,
          (long)gid, (unsigned)mode & ~3u);
  if (maxread != 0)
    sprintf(buf + strlen(buf), ",max_read=%ld", (long)maxread);
  if (blksize != 0)
    sprintf(buf + strlen(buf), ",blksize=%ld", (long)blksize);
  if (mode & 1)
    strcat(buf, ",default_permissions");
  if (mode & 2)
    strcat(buf, ",allow_other");
  syscall(SYS_mount, blkdev, target, "fuseblk", flags, buf);
  return fd;
}

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 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;
}

static void execute_one();
extern unsigned long long procid;

void loop()
{
  while (1) {
    execute_one();
  }
}

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 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);
        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;
      }
    }
  }
}

void execute_call(int call)
{
  switch (call) {
  case 0:
    *(uint32_t*)0x20348f88 = 2;
    *(uint32_t*)0x20348f8c = 0x70;
    *(uint8_t*)0x20348f90 = 0xe6;
    *(uint8_t*)0x20348f91 = 0;
    *(uint8_t*)0x20348f92 = 0;
    *(uint8_t*)0x20348f93 = 0;
    *(uint32_t*)0x20348f94 = 0;
    *(uint64_t*)0x20348f98 = 0;
    *(uint64_t*)0x20348fa0 = 0;
    *(uint64_t*)0x20348fa8 = 0;
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 1, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 5, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 10, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 22, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 24, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 27, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, 0x20348fb0, 0, 29, 35);
    *(uint32_t*)0x20348fb8 = 0;
    *(uint32_t*)0x20348fbc = 0;
    *(uint64_t*)0x20348fc0 = 0x20000000;
    *(uint64_t*)0x20348fc8 = 0;
    *(uint64_t*)0x20348fd0 = 0;
    *(uint64_t*)0x20348fd8 = 0;
    *(uint32_t*)0x20348fe0 = 0;
    *(uint32_t*)0x20348fe4 = 0;
    *(uint64_t*)0x20348fe8 = 0;
    *(uint32_t*)0x20348ff0 = 0;
    *(uint16_t*)0x20348ff4 = 0;
    *(uint16_t*)0x20348ff6 = 0;
    syscall(__NR_perf_event_open, 0x20348f88, 0, 0, -1, 0);
    break;
  case 1:
    memcpy((void*)0x20000080, "./file0", 8);
    memcpy((void*)0x200000c0, "./file0", 8);
    write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
    write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
    inject_fault(83);
    syz_fuseblk_mount(0x20000080, 0x200000c0, 0xa000, 0, 0, 0, 0, 0);
    break;
  case 2:
    memcpy((void*)0x20000040, "./file0", 8);
    syscall(__NR_creat, 0x20000040, 0);
    break;
  }
}

void execute_one()
{
  execute(3);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}