// https://syzkaller.appspot.com/bug?id=238aa07eee3372acfc4c82f99c4960abd0d52d6a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>
#include <linux/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

static unsigned long long procid;

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 void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

struct fs_image_segment {
  void* data;
  uintptr_t size;
  uintptr_t offset;
};

#define IMAGE_MAX_SEGMENTS 4096
#define IMAGE_MAX_SIZE (129 << 20)

static unsigned long fs_image_segment_check(unsigned long size,
                                            unsigned long nsegs,
                                            struct fs_image_segment* segs)
{
  if (nsegs > IMAGE_MAX_SEGMENTS)
    nsegs = IMAGE_MAX_SEGMENTS;
  for (size_t i = 0; i < nsegs; i++) {
    if (segs[i].size > IMAGE_MAX_SIZE)
      segs[i].size = IMAGE_MAX_SIZE;
    segs[i].offset %= IMAGE_MAX_SIZE;
    if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size)
      segs[i].offset = IMAGE_MAX_SIZE - segs[i].size;
    if (size < segs[i].offset + segs[i].offset)
      size = segs[i].offset + segs[i].offset;
  }
  if (size > IMAGE_MAX_SIZE)
    size = IMAGE_MAX_SIZE;
  return size;
}
static int setup_loop_device(long unsigned size, long unsigned nsegs,
                             struct fs_image_segment* segs,
                             const char* loopname, int* memfd_p, int* loopfd_p)
{
  int err = 0, loopfd = -1;
  size = fs_image_segment_check(size, nsegs, segs);
  int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (ftruncate(memfd, size)) {
    err = errno;
    goto error_close_memfd;
  }
  for (size_t i = 0; i < nsegs; i++) {
    if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) {
    }
  }
  loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    err = errno;
    goto error_close_memfd;
  }
  if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
    if (errno != EBUSY) {
      err = errno;
      goto error_close_loop;
    }
    ioctl(loopfd, LOOP_CLR_FD, 0);
    usleep(1000);
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      err = errno;
      goto error_close_loop;
    }
  }
  *memfd_p = memfd;
  *loopfd_p = loopfd;
  return 0;

error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return -1;
}

static long syz_mount_image(volatile long fsarg, volatile long dir,
                            volatile unsigned long size,
                            volatile unsigned long nsegs,
                            volatile long segments, volatile long flags,
                            volatile long optsarg)
{
  struct fs_image_segment* segs = (struct fs_image_segment*)segments;
  int res = -1, err = 0, loopfd = -1, memfd = -1, need_loop_device = !!segs;
  char* mount_opts = (char*)optsarg;
  char* target = (char*)dir;
  char* fs = (char*)fsarg;
  char* source = NULL;
  char loopname[64];
  if (need_loop_device) {
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(size, nsegs, segs, loopname, &memfd, &loopfd) == -1)
      return -1;
    source = loopname;
  }
  mkdir(target, 0777);
  char opts[256];
  memset(opts, 0, sizeof(opts));
  if (strlen(mount_opts) > (sizeof(opts) - 32)) {
  }
  strncpy(opts, mount_opts, sizeof(opts) - 32);
  if (strcmp(fs, "iso9660") == 0) {
    flags |= MS_RDONLY;
  } else if (strncmp(fs, "ext", 3) == 0) {
    if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0)
      strcat(opts, ",errors=continue");
  } else if (strcmp(fs, "xfs") == 0) {
    strcat(opts, ",nouuid");
  }
  res = mount(source, target, fs, flags, opts);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  res = open(target, O_RDONLY | O_DIRECTORY);
  if (res == -1) {
    err = errno;
  }

error_clear_loop:
  if (need_loop_device) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
    close(memfd);
  }
  errno = err;
  return res;
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void loop(void)
{
  int i, call, thread;
  for (call = 0; call < 2; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50 + (call == 1 ? 50 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

void execute_call(int call)
{
  switch (call) {
  case 0:
    *(uint32_t*)0x20000240 = 1;
    *(uint32_t*)0x20000244 = 0x80;
    *(uint8_t*)0x20000248 = 0;
    *(uint8_t*)0x20000249 = 0;
    *(uint8_t*)0x2000024a = 0;
    *(uint8_t*)0x2000024b = 0;
    *(uint32_t*)0x2000024c = 0;
    *(uint64_t*)0x20000250 = 4;
    *(uint64_t*)0x20000258 = 0;
    *(uint64_t*)0x20000260 = 0;
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 1, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 5, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 10, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 22, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 24, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 27, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 29, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 30, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 31, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 32, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 33, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 34, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 35, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 36, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 37, 1);
    STORE_BY_BITMASK(uint64_t, , 0x20000268, 0, 38, 26);
    *(uint32_t*)0x20000270 = 0;
    *(uint32_t*)0x20000274 = 0;
    *(uint64_t*)0x20000278 = 0;
    *(uint64_t*)0x20000280 = 0;
    *(uint64_t*)0x20000288 = 0;
    *(uint64_t*)0x20000290 = 0;
    *(uint32_t*)0x20000298 = 0;
    *(uint32_t*)0x2000029c = 0;
    *(uint64_t*)0x200002a0 = 0;
    *(uint32_t*)0x200002a8 = 0;
    *(uint16_t*)0x200002ac = 0;
    *(uint16_t*)0x200002ae = 0;
    *(uint32_t*)0x200002b0 = 0;
    *(uint32_t*)0x200002b4 = 0;
    *(uint64_t*)0x200002b8 = 0;
    syscall(__NR_perf_event_open, 0x20000240ul, 0, -1ul, -1, 0ul);
    break;
  case 1:
    memcpy((void*)0x20000000, "f2fs\000", 5);
    memcpy((void*)0x20000100, "./file0\000", 8);
    *(uint64_t*)0x20000200 = 0x20010000;
    memcpy((void*)0x20010000,
           "\x10\x20\xf5\xf2\x01\x00\x0b\x00\x09\x00\x00\x00\x03\x00\x00\x00"
           "\x0c\x00\x00\x00\x09\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x40\x00\x00\x00\x00\x00\x00\x18\x00\x00\x00"
           "\x1f\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00"
           "\x01\x00\x00\x00\x18\x00\x00\x00\x00\x02\x00\x00\x00\x02\x00\x00"
           "\x00\x06\x00\x00\x00\x0a\x00\x00\x00\x0e\x00\x00\x00\x10\x00\x00"
           "\x03\x00\x00\x00\x01\x00\x00\x00\x02",
           105);
    *(uint64_t*)0x20000208 = 0x69;
    *(uint64_t*)0x20000210 = 0x400;
    *(uint64_t*)0x20000218 = 0x20010a00;
    memcpy(
        (void*)0x20010a00,
        "\x19\x70\x17\x1e\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02"
        "\x00\x00\x00\x00\x00\x00\x00\x0d\x00\x00\x00\x10\x00\x00\x00\x12\x00"
        "\x00\x00\x17\x00\x00\x00\x16\x00\x00\x00\x15\x00\x00\x00\xff\xff\xff"
        "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
        "\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x14"
        "\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff"
        "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x01\x00\x00"
        "\x06\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x04"
        "\x00\x00\x00\x40\x00\x00\x00\x40\x00\x00\x00\xfc\x0f",
        166);
    *(uint64_t*)0x20000220 = 0xa6;
    *(uint64_t*)0x20000228 = 0x200000;
    *(uint64_t*)0x20000230 = 0x20010b00;
    memcpy((void*)0x20010b00,
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x01\x5d\x57"
           "\x01\x00\x03\x00\x00\x00\x00\x03\x00\x00\x00\x00\x3e",
           45);
    *(uint64_t*)0x20000238 = 0x2d;
    *(uint64_t*)0x20000240 = 0x200fe0;
    *(uint64_t*)0x20000248 = 0x20010c00;
    memcpy((void*)0x20010c00,
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x06\x00\x17\x00\x00"
           "\x00\x01\x0c\x80",
           36);
    *(uint64_t*)0x20000250 = 0x24;
    *(uint64_t*)0x20000258 = 0x2011e0;
    *(uint64_t*)0x20000260 = 0x20011600;
    memcpy(
        (void*)0x20011600,
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x19\x70"
        "\x17\x1e\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x02\x00\x00"
        "\x00\x00\x00\x00\x00\x0d\x00\x00\x00\x10\x00\x00\x00\x12\x00\x00\x00"
        "\x17\x00\x00\x00\x16\x00\x00\x00\x15\x00\x00\x00\xff\xff\xff\xff\xff"
        "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x14\x00\x00"
        "\x00\x01\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\xff\xff\xff\xff"
        "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85\x01\x00\x00\x06\x00"
        "\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00"
        "\x00\x40\x00\x00\x00\x40\x00\x00\x00\xfc\x0f",
        198);
    *(uint64_t*)0x20000268 = 0xc6;
    *(uint64_t*)0x20000270 = 0x204fe0;
    *(uint64_t*)0x20000278 = 0x20011700;
    memcpy((void*)0x20011700,
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x01\x5d\x57",
           32);
    *(uint64_t*)0x20000280 = 0x20;
    *(uint64_t*)0x20000288 = 0x205fe0;
    *(uint64_t*)0x20000290 = 0x20012100;
    memcpy((void*)0x20012100,
           "\xed\x41\x00\x00\x5c\xf9\x01\x00\x53\x5f\x01\x00\x02\x00\x00\x00"
           "\x00\x10\x00\x00\x00\x00\x00\x00\x02",
           25);
    *(uint64_t*)0x20000298 = 0x19;
    *(uint64_t*)0x200002a0 = 0x3e00000;
    *(uint64_t*)0x200002a8 = 0x20012300;
    memcpy((void*)0x20012300,
           "\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x03", 13);
    *(uint64_t*)0x200002b0 = 0xd;
    *(uint64_t*)0x200002b8 = 0x3e00fe0;
    memcpy((void*)0x20000300, "jqfmt=vfsv1", 11);
    *(uint8_t*)0x2000030b = 0x2c;
    memcpy((void*)0x2000030c, "grpjquota", 9);
    *(uint8_t*)0x20000315 = 0x3d;
    memcpy((void*)0x20000316,
           "\315\023\376W\363\313JN\n\230\200(\020\334Ah\a\'\376V|"
           "\034\203B84\253\025\216\020\240\360\023\225y\356\226\301\271\257"
           "\335Q\206\234@\202\000\000\362N\367\016\261\006="
           "\313\376E\201\334\321\026\200\244?"
           "\363J\033\031\016\256g\206f\217\2221\177c\260\35627x\243\323Y\261"
           "\001<*\214\251\364\340\306W\260\3604`G\301\305Y\225\350\316\334ve{"
           "\335M\375\230\231\237\314\353\337u\315,>\225e\226&"
           "\376\035\275CGgNu\264\350\030\367\353\331\261\227}"
           "m\327\307m\212o\024ji\331\315\350\211\277\340\210\006m\227\336\260"
           "\235\363\337\347g\251s\261$",
           176);
    *(uint8_t*)0x200003c6 = 0x2c;
    *(uint8_t*)0x200003c7 = 0;
    syz_mount_image(0x20000000, 0x20000100, 0, 8, 0x20000200, 0, 0x20000300);
    break;
  }
}
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);
  loop();
  return 0;
}