report

=====================================================
BUG: KMSAN: uninit-value in crc32_body lib/crc32.c:110 [inline]
BUG: KMSAN: uninit-value in crc32_le_generic lib/crc32.c:179 [inline]
BUG: KMSAN: uninit-value in crc32_le_base+0x475/0xe70 lib/crc32.c:197
 crc32_body lib/crc32.c:110 [inline]
 crc32_le_generic lib/crc32.c:179 [inline]
 crc32_le_base+0x475/0xe70 lib/crc32.c:197
 nilfs_segbuf_fill_in_data_crc fs/nilfs2/segbuf.c:224 [inline]
 nilfs_add_checksums_on_logs+0xcb2/0x10a0 fs/nilfs2/segbuf.c:327
 nilfs_segctor_do_construct+0xad1d/0xf640 fs/nilfs2/segment.c:2112
 nilfs_segctor_construct+0x1fd/0xf30 fs/nilfs2/segment.c:2415
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2523 [inline]
 nilfs_segctor_thread+0x551/0x1350 fs/nilfs2/segment.c:2606
 kthread+0x422/0x5a0 kernel/kthread.c:388
 ret_from_fork+0x7f/0xa0 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

Uninit was created at:
 __alloc_pages+0x9a8/0xe00 mm/page_alloc.c:4591
 alloc_pages_mpol+0x6b3/0xaa0 mm/mempolicy.c:2133
 alloc_pages mm/mempolicy.c:2204 [inline]
 folio_alloc+0x218/0x3f0 mm/mempolicy.c:2211
 filemap_alloc_folio+0xb8/0x4b0 mm/filemap.c:974
 __filemap_get_folio+0xa8a/0x1910 mm/filemap.c:1918
 pagecache_get_page+0x56/0x1d0 mm/folio-compat.c:99
 grab_cache_page_write_begin+0x61/0x80 mm/folio-compat.c:109
 block_write_begin+0x5a/0x4a0 fs/buffer.c:2223
 nilfs_write_begin+0x107/0x220 fs/nilfs2/inode.c:261
 generic_perform_write+0x417/0xce0 mm/filemap.c:3927
 __generic_file_write_iter+0x233/0x4b0 mm/filemap.c:4022
 generic_file_write_iter+0x10e/0x600 mm/filemap.c:4048
 __kernel_write_iter+0x365/0xa00 fs/read_write.c:523
 dump_emit_page fs/coredump.c:888 [inline]
 dump_user_range+0x5d7/0xe00 fs/coredump.c:915
 elf_core_dump+0x5847/0x5fa0 fs/binfmt_elf.c:2077
 do_coredump+0x3bb6/0x4e60 fs/coredump.c:764
 get_signal+0x28f7/0x30b0 kernel/signal.c:2890
 arch_do_signal_or_restart+0x5e/0xda0 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0xaa/0x160 kernel/entry/common.c:225
 irqentry_exit+0x16/0x40 kernel/entry/common.c:328
 exc_page_fault+0x246/0x6f0 arch/x86/mm/fault.c:1566
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:570

CPU: 1 PID: 11178 Comm: segctord Not tainted 6.7.0-00562-g9f8413c4a66f-dirty #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
=====================================================

repro.c

// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.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>

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

#ifndef __NR_cachestat
#define __NR_cachestat 451
#endif
#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);
}

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;
  }
}

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 long syz_open_procfs(volatile long a0, volatile long a1) {
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

//% This code is derived from puff.{c,h}, found in the zlib development. The
//% original files come with the following copyright notice:

//% Copyright (C) 2002-2013 Mark Adler, all rights reserved
//% version 2.3, 21 Jan 2013
//% This software is provided 'as-is', without any express or implied
//% warranty.  In no event will the author be held liable for any damages
//% arising from the use of this software.
//% Permission is granted to anyone to use this software for any purpose,
//% including commercial applications, and to alter it and redistribute it
//% freely, subject to the following restrictions:
//% 1. The origin of this software must not be misrepresented; you must not
//%    claim that you wrote the original software. If you use this software
//%    in a product, an acknowledgment in the product documentation would be
//%    appreciated but is not required.
//% 2. Altered source versions must be plainly marked as such, and must not be
//%    misrepresented as being the original software.
//% 3. This notice may not be removed or altered from any source distribution.
//% Mark Adler    madler@alumni.caltech.edu

//% BEGIN CODE DERIVED FROM puff.{c,h}

#define MAXBITS 15
#define MAXLCODES 286
#define MAXDCODES 30
#define MAXCODES (MAXLCODES + MAXDCODES)
#define FIXLCODES 288

struct puff_state {
  unsigned char* out;
  unsigned long outlen;
  unsigned long outcnt;
  const unsigned char* in;
  unsigned long inlen;
  unsigned long incnt;
  int bitbuf;
  int bitcnt;
  jmp_buf env;
};
static int puff_bits(struct puff_state* s, int need) {
  long val = s->bitbuf;
  while (s->bitcnt < need) {
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    val |= (long)(s->in[s->incnt++]) << s->bitcnt;
    s->bitcnt += 8;
  }
  s->bitbuf = (int)(val >> need);
  s->bitcnt -= need;
  return (int)(val & ((1L << need) - 1));
}
static int puff_stored(struct puff_state* s) {
  s->bitbuf = 0;
  s->bitcnt = 0;
  if (s->incnt + 4 > s->inlen)
    return 2;
  unsigned len = s->in[s->incnt++];
  len |= s->in[s->incnt++] << 8;
  if (s->in[s->incnt++] != (~len & 0xff) ||
      s->in[s->incnt++] != ((~len >> 8) & 0xff))
    return -2;
  if (s->incnt + len > s->inlen)
    return 2;
  if (s->outcnt + len > s->outlen)
    return 1;
  for (; len--; s->outcnt++, s->incnt++) {
    if (s->in[s->incnt])
      s->out[s->outcnt] = s->in[s->incnt];
  }
  return 0;
}
struct puff_huffman {
  short* count;
  short* symbol;
};
static int puff_decode(struct puff_state* s, const struct puff_huffman* h) {
  int first = 0;
  int index = 0;
  int bitbuf = s->bitbuf;
  int left = s->bitcnt;
  int code = first = index = 0;
  int len = 1;
  short* next = h->count + 1;
  while (1) {
    while (left--) {
      code |= bitbuf & 1;
      bitbuf >>= 1;
      int count = *next++;
      if (code - count < first) {
        s->bitbuf = bitbuf;
        s->bitcnt = (s->bitcnt - len) & 7;
        return h->symbol[index + (code - first)];
      }
      index += count;
      first += count;
      first <<= 1;
      code <<= 1;
      len++;
    }
    left = (MAXBITS + 1) - len;
    if (left == 0)
      break;
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    bitbuf = s->in[s->incnt++];
    if (left > 8)
      left = 8;
  }
  return -10;
}
static int puff_construct(struct puff_huffman* h, const short* length, int n) {
  int len;
  for (len = 0; len <= MAXBITS; len++)
    h->count[len] = 0;
  int symbol;
  for (symbol = 0; symbol < n; symbol++)
    (h->count[length[symbol]])++;
  if (h->count[0] == n)
    return 0;
  int left = 1;
  for (len = 1; len <= MAXBITS; len++) {
    left <<= 1;
    left -= h->count[len];
    if (left < 0)
      return left;
  }
  short offs[MAXBITS + 1];
  offs[1] = 0;
  for (len = 1; len < MAXBITS; len++)
    offs[len + 1] = offs[len] + h->count[len];
  for (symbol = 0; symbol < n; symbol++)
    if (length[symbol] != 0)
      h->symbol[offs[length[symbol]]++] = symbol;
  return left;
}
static int puff_codes(struct puff_state* s,
                      const struct puff_huffman* lencode,
                      const struct puff_huffman* distcode) {
  static const short lens[29] = {3,  4,  5,  6,   7,   8,   9,   10,  11, 13,
                                 15, 17, 19, 23,  27,  31,  35,  43,  51, 59,
                                 67, 83, 99, 115, 131, 163, 195, 227, 258};
  static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
                                 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
  static const short dists[30] = {
      1,    2,    3,    4,    5,    7,    9,    13,    17,    25,
      33,   49,   65,   97,   129,  193,  257,  385,   513,   769,
      1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
  static const short dext[30] = {0, 0, 0,  0,  1,  1,  2,  2,  3,  3,
                                 4, 4, 5,  5,  6,  6,  7,  7,  8,  8,
                                 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
  int symbol;
  do {
    symbol = puff_decode(s, lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 256) {
      if (s->outcnt == s->outlen)
        return 1;
      if (symbol)
        s->out[s->outcnt] = symbol;
      s->outcnt++;
    } else if (symbol > 256) {
      symbol -= 257;
      if (symbol >= 29)
        return -10;
      int len = lens[symbol] + puff_bits(s, lext[symbol]);
      symbol = puff_decode(s, distcode);
      if (symbol < 0)
        return symbol;
      unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]);
      if (dist > s->outcnt)
        return -11;
      if (s->outcnt + len > s->outlen)
        return 1;
      while (len--) {
        if (dist <= s->outcnt && s->out[s->outcnt - dist])
          s->out[s->outcnt] = s->out[s->outcnt - dist];
        s->outcnt++;
      }
    }
  } while (symbol != 256);
  return 0;
}
static int puff_fixed(struct puff_state* s) {
  static int virgin = 1;
  static short lencnt[MAXBITS + 1], lensym[FIXLCODES];
  static short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  static struct puff_huffman lencode, distcode;
  if (virgin) {
    lencode.count = lencnt;
    lencode.symbol = lensym;
    distcode.count = distcnt;
    distcode.symbol = distsym;
    short lengths[FIXLCODES];
    int symbol;
    for (symbol = 0; symbol < 144; symbol++)
      lengths[symbol] = 8;
    for (; symbol < 256; symbol++)
      lengths[symbol] = 9;
    for (; symbol < 280; symbol++)
      lengths[symbol] = 7;
    for (; symbol < FIXLCODES; symbol++)
      lengths[symbol] = 8;
    puff_construct(&lencode, lengths, FIXLCODES);
    for (symbol = 0; symbol < MAXDCODES; symbol++)
      lengths[symbol] = 5;
    puff_construct(&distcode, lengths, MAXDCODES);
    virgin = 0;
  }
  return puff_codes(s, &lencode, &distcode);
}
static int puff_dynamic(struct puff_state* s) {
  static const short order[19] = {16, 17, 18, 0, 8,  7, 9,  6, 10, 5,
                                  11, 4,  12, 3, 13, 2, 14, 1, 15};
  int nlen = puff_bits(s, 5) + 257;
  int ndist = puff_bits(s, 5) + 1;
  int ncode = puff_bits(s, 4) + 4;
  if (nlen > MAXLCODES || ndist > MAXDCODES)
    return -3;
  short lengths[MAXCODES];
  int index;
  for (index = 0; index < ncode; index++)
    lengths[order[index]] = puff_bits(s, 3);
  for (; index < 19; index++)
    lengths[order[index]] = 0;
  short lencnt[MAXBITS + 1], lensym[MAXLCODES];
  struct puff_huffman lencode = {lencnt, lensym};
  int err = puff_construct(&lencode, lengths, 19);
  if (err != 0)
    return -4;
  index = 0;
  while (index < nlen + ndist) {
    int symbol;
    int len;
    symbol = puff_decode(s, &lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 16)
      lengths[index++] = symbol;
    else {
      len = 0;
      if (symbol == 16) {
        if (index == 0)
          return -5;
        len = lengths[index - 1];
        symbol = 3 + puff_bits(s, 2);
      } else if (symbol == 17)
        symbol = 3 + puff_bits(s, 3);
      else
        symbol = 11 + puff_bits(s, 7);
      if (index + symbol > nlen + ndist)
        return -6;
      while (symbol--)
        lengths[index++] = len;
    }
  }
  if (lengths[256] == 0)
    return -9;
  err = puff_construct(&lencode, lengths, nlen);
  if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
    return -7;
  short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  struct puff_huffman distcode = {distcnt, distsym};
  err = puff_construct(&distcode, lengths + nlen, ndist);
  if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
    return -8;
  return puff_codes(s, &lencode, &distcode);
}
static int puff(unsigned char* dest,
                unsigned long* destlen,
                const unsigned char* source,
                unsigned long sourcelen) {
  struct puff_state s = {
      .out = dest,
      .outlen = *destlen,
      .outcnt = 0,
      .in = source,
      .inlen = sourcelen,
      .incnt = 0,
      .bitbuf = 0,
      .bitcnt = 0,
  };
  int err;
  if (setjmp(s.env) != 0)
    err = 2;
  else {
    int last;
    do {
      last = puff_bits(&s, 1);
      int type = puff_bits(&s, 2);
      err = type == 0 ? puff_stored(&s)
                      : (type == 1 ? puff_fixed(&s)
                                   : (type == 2 ? puff_dynamic(&s) : -1));
      if (err != 0)
        break;
    } while (!last);
  }
  *destlen = s.outcnt;
  return err;
}

//% END CODE DERIVED FROM puff.{c,h}

#define ZLIB_HEADER_WIDTH 2

static int puff_zlib_to_file(const unsigned char* source,
                             unsigned long sourcelen,
                             int dest_fd) {
  if (sourcelen < ZLIB_HEADER_WIDTH)
    return 0;
  source += ZLIB_HEADER_WIDTH;
  sourcelen -= ZLIB_HEADER_WIDTH;
  const unsigned long max_destlen = 132 << 20;
  void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ,
                   MAP_PRIVATE | MAP_ANON, -1, 0);
  if (ret == MAP_FAILED)
    return -1;
  unsigned char* dest = (unsigned char*)ret;
  unsigned long destlen = max_destlen;
  int err = puff(dest, &destlen, source, sourcelen);
  if (err) {
    munmap(dest, max_destlen);
    errno = -err;
    return -1;
  }
  if (write(dest_fd, dest, destlen) != (ssize_t)destlen) {
    munmap(dest, max_destlen);
    return -1;
  }
  return munmap(dest, max_destlen);
}

static int setup_loop_device(unsigned char* data,
                             unsigned long size,
                             const char* loopname,
                             int* loopfd_p) {
  int err = 0, loopfd = -1;
  int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (puff_zlib_to_file(data, size, memfd)) {
    err = errno;
    goto error_close_memfd;
  }
  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;
    }
  }
  close(memfd);
  *loopfd_p = loopfd;
  return 0;

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

static void reset_loop_device(const char* loopname) {
  int loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    return;
  }
  if (ioctl(loopfd, LOOP_CLR_FD, 0)) {
  }
  close(loopfd);
}

static long syz_mount_image(volatile long fsarg,
                            volatile long dir,
                            volatile long flags,
                            volatile long optsarg,
                            volatile long change_dir,
                            volatile unsigned long size,
                            volatile long image) {
  unsigned char* data = (unsigned char*)image;
  int res = -1, err = 0, need_loop_device = !!size;
  char* mount_opts = (char*)optsarg;
  char* target = (char*)dir;
  char* fs = (char*)fsarg;
  char* source = NULL;
  char loopname[64];
  if (need_loop_device) {
    int loopfd;
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(data, size, loopname, &loopfd) == -1)
      return -1;
    close(loopfd);
    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) {
    bool has_remount_ro = false;
    char* remount_ro_start = strstr(opts, "errors=remount-ro");
    if (remount_ro_start != NULL) {
      char after = *(remount_ro_start + strlen("errors=remount-ro"));
      char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1);
      has_remount_ro = ((before == '\0' || before == ',') &&
                        (after == '\0' || after == ','));
    }
    if (strstr(opts, "errors=panic") || !has_remount_ro)
      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;
    goto error_clear_loop;
  }
  if (change_dir) {
    res = chdir(target);
    if (res == -1) {
      err = errno;
    }
  }

error_clear_loop:
  if (need_loop_device)
    reset_loop_device(loopname);
  errno = err;
  return res;
}

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 reset_loop() {
  char buf[64];
  snprintf(buf, sizeof(buf), "/dev/loop%llu", procid);
  int loopfd = open(buf, O_RDWR);
  if (loopfd != -1) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
  }
}

static void setup_test() {
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

#define USLEEP_FORKED_CHILD (3 * 50 * 1000)

static long handle_clone_ret(long ret) {
  if (ret != 0) {
    return ret;
  }
  usleep(USLEEP_FORKED_CHILD);
  syscall(__NR_exit, 0);
  while (1) {
  }
}

static long syz_clone(volatile long flags,
                      volatile long stack,
                      volatile long stack_len,
                      volatile long ptid,
                      volatile long ctid,
                      volatile long tls) {
  long sp = (stack + stack_len) & ~15;
  long ret = (long)syscall(__NR_clone, flags & ~CLONE_VM, sp, ptid, ctid, tls);
  return handle_clone_ret(ret);
}

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 execute_one(void) {
  int i, call, thread;
  for (call = 0; call < 12; 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);
      if (call == 1 || call == 3 || call == 4 || call == 6 || call == 7 ||
          call == 9 || call == 10)
        break;
      event_timedwait(&th->done, 50 + (call == 0 ? 4000 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void) {
  int iter = 0;
  for (;; iter++) {
    reset_loop();
    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[6] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff, 0x0};

void execute_call(int call) {
  intptr_t res = 0;
  switch (call) {
    case 0:
      memcpy((void*)0x20000000, "nilfs2\000", 7);
      memcpy((void*)0x20000a80, "./file0\000", 8);
      memcpy(
          (void*)0x20001540,
          "\x78\x9c\xec\xdd\x4d\x8c\x5b\x47\x1d\x00\xf0\xf1\xee\x7a\xd3\x7c\x94"
          "\x38\x25\xa1\x4b\x1a\xda\x84\x42\x5b\x3e\xba\xdb\x6c\x96\xf0\x11\x41"
          "\x52\x35\x42\x22\x6a\x2a\x6e\x95\x2a\x2e\x51\x9a\x96\x88\x34\x20\x52"
          "\x09\x5a\xf5\x90\xe4\xc4\x8d\x56\x55\xb8\xf2\x21\x4e\xbd\x54\x80\x90"
          "\xe8\x05\x45\x3d\x71\xa9\x44\x23\x55\x48\x3d\x15\x0e\x1c\x88\x82\x54"
          "\x89\x03\x14\x92\x45\xf1\xce\x78\xed\x7f\x6c\x3d\x7b\xb3\x59\xaf\xd7"
          "\xbf\x9f\x34\x3b\x9e\x37\x63\xcf\x3c\xef\xf3\xf3\xf3\x7b\x6f\x66\x12"
          "\x30\xb6\x26\x9a\x7f\x17\x16\x66\x6a\x29\x5d\x7a\xeb\xf5\xa3\xff\x78"
          "\xe8\xef\x9b\x6f\x2e\x39\xdc\x2a\xd1\x68\xfe\x9d\x6a\x4b\xd5\x53\x4a"
          "\xb5\x9c\x9e\x0a\xaf\xf7\xc1\xe4\x52\x7c\xfd\xc3\x57\x4e\x76\x8b\x6b"
          "\x69\xbe\xf9\xb7\xa4\xd3\x53\xd7\x5a\xcf\xdd\x9a\x52\x3a\x9f\xf6\xa6"
          "\xcb\xa9\x91\x76\x5f\xba\xf2\xda\x3b\xf3\x4f\x1e\xbf\x70\xec\xe2\xbe"
          "\x77\xdf\x38\x74\xf5\xce\xac\x3d\x00\x00\x8c\x97\x6f\x5f\x3e\xb4\xb0"
          "\xeb\xaf\x7f\xbe\x6f\xc7\x47\x6f\xde\x7f\x24\x6d\x6a\x2d\x2f\xc7\xe7"
          "\x8d\x9c\xde\x96\x8f\xfb\x8f\xe4\x03\xff\x72\xfc\x3f\x91\x3a\xd3\xb5"
          "\xb6\xd0\x6e\x3a\x94\x9b\xca\x61\x22\x94\x9b\xec\x52\xae\xbd\x9e\x7a"
          "\x28\x37\xd5\xa3\xfe\xe9\xf0\xba\xf5\x1e\xe5\x36\x55\xd4\x3f\xd9\xb6"
          "\xac\xdb\x7a\xc3\x28\x2b\xdb\x71\x23\xd5\x26\x66\x3b\xd2\x13\x13\xb3"
          "\xb3\x4b\xbf\xc9\x53\xf3\x77\xfd\x74\x6d\xf6\xec\xe9\x33\xcf\x9d\x1b"
          "\x52\x43\x81\x55\xf7\xaf\x07\x52\x4a\x7b\x47\x28\x1c\x5e\x07\x6d\x58"
          "\x61\x58\x5c\x07\x6d\x18\xc9\x70\x64\x1d\xb4\x61\x83\x86\xc5\xed\xc3"
          "\xde\x03\x01\x2c\x89\xd7\x0b\x6f\x71\x3e\x9e\x59\xb8\x3d\xad\x57\x9b"
          "\xea\xaf\xfe\x6b\x8f\x4f\x74\x7f\x3e\xac\x82\xb5\xde\xfe\xd5\x3f\x5a"
          "\xf5\xff\xfa\x82\x3d\x0e\xab\x67\xa3\x6e\x4d\x65\xbd\xca\xe7\x68\x5b"
          "\x4e\xc7\xeb\x08\xf1\xfe\xa5\xde\x9f\xbf\x78\xa5\xa3\x73\x69\xbc\x1e"
          "\x51\xef\xb3\x9d\xbd\xae\x23\x8c\xca\xf5\x85\x5e\xed\x9c\x5c\xe3\x76"
          "\xac\x54\xaf\xf6\xc7\xed\x62\xa3\xfa\x7a\x8e\xcb\xfb\xf0\x8d\x90\xdf"
          "\xfe\xf9\x89\xff\xd3\x51\xf9\x1f\x03\xdd\xfd\x7b\xd4\xce\xff\x0b\xc2"
          "\xb8\x87\xb4\x7a\xaf\xb5\x38\xe4\xfd\x0f\xb0\x7e\xc5\xfb\xe6\x16\xb3"
          "\x92\x1f\xef\xeb\x8b\xf9\x9b\x2a\xf2\xef\xaa\xc8\xdf\x5c\x91\xbf\xa5"
          "\x22\x7f\x6b\x45\x3e\x8c\xb3\xdf\xbd\xf8\xd3\xf4\x6a\x6d\xf9\x77\x7e"
          "\xfc\x4d\x3f\xe8\xf9\xf0\x72\x9e\xed\xee\x1c\x7f\x6c\xc0\xf6\xc4\xf3"
          "\x91\x83\xd6\x1f\xef\xfb\x1d\xd4\xed\xd6\x1f\xef\x27\x86\xf5\xec\x0f"
          "\x27\x9e\x3e\xf5\x95\x67\x9f\xb9\xb2\x74\xff\x7f\xad\xb5\xfd\xdf\xc8"
          "\xdb\x7b\xf9\xb9\xd1\xc8\x9f\xad\xcb\xb9\x40\x39\x5f\x18\xcf\xab\xb7"
          "\xee\xfd\x6f\x74\xd6\x33\xd1\xa3\xdc\x3d\xa1\x3d\x77\x77\x29\xdf\x7c"
          "\xbc\xb3\xb3\x5c\x6d\xe7\xf2\xeb\xa4\xb6\xfd\xcc\x2d\xed\x98\xe9\x7c"
          "\xde\xf6\x5e\xe5\xf6\x74\x96\x6b\x84\x72\x9b\x73\xb8\x2b\xb4\x37\x1e"
          "\x9f\x6c\x09\xcf\x2b\xc7\x1f\x65\xbf\x5a\xde\xaf\xa9\xb0\xbe\xf5\xb0"
          "\x1e\xd3\xa1\x1d\x65\xbf\xb2\x23\xc7\xb1\x1d\xb0\x12\x65\x7b\xec\x75"
          "\xff\x7f\xd9\x3e\x67\x52\xbd\xf6\xdc\xe9\x33\xa7\x1e\xcb\xe9\xb2\x9d"
          "\xfe\x69\xb2\xbe\xe9\xe6\xf2\xfd\x6b\xdc\x6e\xe0\xf6\xf5\xdb\xff\x67"
          "\x26\x75\xf6\xff\xd9\xd6\x5a\x5e\x9f\x68\xdf\x2f\x6c\x5f\x5e\x5e\x6b"
          "\xdf\x2f\x34\xc2\xf2\xf9\x1e\xcb\x0f\xe4\x74\xf9\x9e\xfb\xee\xe4\xe6"
          "\xe6\xf2\xd9\x93\xdf\x3f\xf3\xec\x6a\xaf\x3c\x8c\xb9\x73\x2f\xbd\xfc"
          "\xbd\x13\x67\xce\x9c\xfa\xa1\x07\x2b\x7e\xf0\xcd\xf5\xd1\x0c\x0f\x3c"
          "\x58\xc5\x07\xc3\xde\x33\x01\x77\xda\xdc\x8b\x2f\xfc\x60\xee\xdc\x4b"
          "\x2f\x3f\x7a\xfa\x85\x13\xcf\x9f\x7a\xfe\xd4\xd9\x03\x07\x0f\x1e\x98"
          "\x9f\x3f\xf8\xd5\x03\x0b\x73\xcd\xe3\xfa\xb9\xf6\xa3\x7b\x60\x23\x59"
          "\xfe\xd2\x1f\x76\x4b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x7e\xfd"
          "\xe8\xd8\xd1\x2b\xef\xbd\xfd\xe5\xf7\x97\xfa\xff\x2f\xf7\xff\x2b\xfd"
          "\xff\xcb\x9d\xbf\xa5\xff\xff\x4f\x42\xff\xff\xd8\x4f\xbe\xf4\x83\x2f"
          "\xfd\x00\x77\x74\xc9\x6f\x96\x09\x03\xac\x4e\x87\x72\xf5\x1c\x3e\x1e"
          "\xda\xbb\x33\xd4\xb3\x2b\x3c\xef\x13\x39\x6e\xcd\xe3\x97\xfb\xff\x97"
          "\xea\xe2\xb8\xae\xa5\x3d\xf7\x86\xe5\x71\xfc\xde\x52\x2e\x0c\x27\x70"
          "\xcb\x78\x29\xd3\x61\x0c\x92\x38\x5f\xe0\xa7\x73\x7c\x31\xc7\xbf\x4a"
          "\x30\x44\xb5\xcd\xdd\x17\xe7\xb8\x6a\x7c\xeb\xb2\xad\x97\xf1\x29\x8c"
          "\x4b\x31\x9a\xca\xff\xad\x6c\x0d\x65\x1c\x93\xd2\xff\xbb\xeb\xb8\x4e"
          "\x6d\xff\xec\x1d\x6b\xd0\x46\x56\xdf\x5a\x74\x27\x1c\xf6\x3a\x02\xdd"
          "\xfd\xd3\xf8\xdf\x82\x30\xb6\x61\x71\xb1\xd7\x2c\x1e\xfd\xce\x60\x03"
          "\xb0\x3a\x86\x3d\xff\x67\x39\xef\x59\xe2\xb3\x7f\xfc\xd6\x5d\x37\x43"
          "\x29\x76\xed\xf1\xce\xfd\x65\x1c\xbf\x14\x06\xf1\x97\xf7\x3a\xd3\xeb"
          "\x7d\xfe\x49\xf5\x6f\xac\xf9\x3f\x5b\xf3\xdf\xf5\xbd\xff\x0b\x33\xe6"
          "\x35\x56\x56\xef\x7f\x7e\x7e\xf5\xfd\xb6\x6a\xd3\xee\x7e\xeb\x8f\xeb"
          "\x5f\xc6\x81\xde\x39\x58\xfd\x1f\xe5\xfa\xcb\xda\x3c\x9c\xfa\xab\x7f"
          "\xf1\x97\xa1\xfe\x78\x41\xa8\x4f\xff\x0d\xf5\x6f\xe9\xb3\xfe\x5b\xd6"
          "\x7f\xcf\xca\xea\xff\x5f\xae\xbf\xbc\x6d\x8f\x3c\xd8\x6f\xfd\x4b\x2d"
          "\xae\x4d\x74\xb6\x23\x9e\x37\x2e\xd7\xff\xe2\x79\xe3\xe2\x7a\x58\xff"
          "\x32\xb6\xe7\xc0\xeb\xbf\xc2\x89\x1a\x6f\xe4\xfa\x61\x9c\x8d\xca\x3c"
          "\xb3\x83\x0a\xf3\xff\xb6\x0e\xda\x57\x3e\xff\x6f\x76\x7e\x75\xe7\xff"
          "\xed\x25\xde\x87\xf1\xa5\x9c\x2e\x3b\xc2\x72\x9f\x43\x9c\xef\x64\xd0"
          "\xf6\x97\xfb\x2b\xca\xf7\xc0\xae\xf0\xfa\xb5\x8a\xef\x37\xf3\xff\x8e"
          "\xb6\xaf\xe5\xb8\xea\xf3\x50\xe6\xff\x2d\xdb\x63\x23\x7f\xe5\xb7\xa5"
          "\x9b\xef\x65\x49\xd7\xbb\xbc\xb7\x1b\x75\x5f\x03\xa3\xea\x03\xd7\xff"
          "\x04\x61\xcd\x43\x6b\x9e\xb8\x21\xb7\x63\x71\x71\xf1\xce\x9e\xd0\xaa"
          "\x30\xd4\xca\x19\xfa\xfb\x3f\xec\xdf\x09\xc3\xae\x7f\xd8\xef\x7f\x95"
          "\x38\xff\x6f\x3c\x86\x8f\xf3\xff\xc6\xfc\x38\xff\x6f\xcc\x8f\xf3\xff"
          "\xc6\xfc\x38\xbf\x5e\xcc\x8f\xf3\xff\xc6\xf7\x33\xce\xff\x1b\xf3\xef"
          "\x0d\xaf\x1b\xe7\x07\x9e\xa9\xc8\xff\x64\x45\xfe\xee\xee\xf9\xad\x9f"
          "\xed\xf7\x55\x3c\x7f\x4f\x45\xfe\xa7\x2a\xf2\xf7\x55\xe4\xdf\x5f\x91"
          "\xff\x40\x45\xfe\x3d\x15\xf9\x0f\x56\xe4\x7f\xa6\x22\xff\xb3\x15\xf9"
          "\x0f\x55\xe4\x3f\x52\x91\xff\xb9\x8a\xfc\x8d\xae\xf4\x47\x19\xd7\xf5"
          "\x87\x71\x16\xfb\xe7\xf9\xfc\xc3\xf8\x28\xd7\x7f\x7a\x7d\xfe\x77\x56"
          "\xe4\x03\xa3\xeb\x67\x6f\xee\x7f\xe2\x99\xdf\x7e\xa7\xb1\xd4\xff\x7f"
          "\xba\x75\x3e\xa4\x5c\xc7\x3b\x92\xd3\xf5\xfc\xdb\xf9\xc7\x39\x1d\xaf"
          "\x7b\xa7\xb6\xf4\xcd\xbc\xb7\x73\xfa\x6f\x21\x7f\xbd\x9f\xef\x80\x71"
          "\x12\xc7\xcf\x88\xdf\xef\x0f\x57\xe4\x03\xa3\xab\xdc\xe7\xe5\xf3\x0d"
          "\x63\xa8\xd6\x7d\xc4\x9e\x7e\xc7\xad\xea\x75\x9c\xcf\x68\xf9\x7c\x8e"
          "\xbf\x90\xe3\x2f\xe6\xf8\xd1\x1c\xcf\xe6\x78\x2e\xc7\xfb\x73\x3c\xbf"
          "\x46\xed\xe3\xce\x78\xe2\x37\xbf\x3f\xf4\x6a\x6d\xf9\xf7\xfe\xf6\x90"
          "\xdf\xef\xfd\xe4\xb1\x3f\x50\xc7\x38\x51\x29\xa5\x03\x7d\xb6\x27\x9e"
          "\x1f\x18\xf4\x7e\xf6\x38\x8e\xdf\xa0\x6e\xb7\xfe\x15\x76\x07\x03\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\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\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\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\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\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\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\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\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\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\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\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\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\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"
          "\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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"
          "\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\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\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\x00"
          "\x00\x00\x00\x00\x00\x00\x18\x9a\x89\xe6\xdf\x85\x85\x99\x5a\x4a\x97"
          "\xde\x7a\xfd\xe8\xd3\xc7\x4f\xcf\xdd\x5c\x72\xb8\x55\xa2\xd1\xfc\x3b"
          "\xd5\x96\xaa\xb7\x9e\x97\xd2\x63\x39\x9e\xcc\xf1\x2f\xf2\x83\xeb\x1f"
          "\xbe\x72\xb2\x3d\xbe\x91\xe3\x5a\x9a\x4f\xb5\x54\x6b\x2d\x4f\x4f\x5d"
          "\x6b\xd5\xb4\x35\xa5\x74\x3e\xed\x4d\x97\x53\x23\xed\xbe\x74\xe5\xb5"
          "\x77\xe6\x9f\x3c\x7e\xe1\xd8\xc5\x7d\xef\xbe\x71\xe8\xea\x9d\x7b\x07"
          "\x00\x00\x00\x60\xe3\xfb\x7f\x00\x00\x00\xff\xff\xb0\xb8\x0e\x84",
          2634);
      syz_mount_image(/*fs=*/0x20000000, /*dir=*/0x20000a80,
                      /*flags=MS_NOEXEC|MS_NODIRATIME*/ 0x808,
                      /*opts=*/0x200000c0, /*chdir=*/1, /*size=*/0xa4a,
                      /*img=*/0x20001540);
      break;
    case 1:
      memcpy((void*)0x20000000, "./bus\000", 6);
      res = syscall(__NR_open, /*file=*/0x20000000ul, /*flags=*/0ul,
                    /*mode=*/0ul);
      if (res != -1)
        r[0] = res;
      break;
    case 2:
      memcpy((void*)0x20007f80, "./bus\000", 6);
      res = syscall(
          __NR_open, /*file=*/0x20007f80ul,
          /*flags=O_SYNC|O_NOCTTY|O_NOATIME|O_DIRECT|O_CREAT|0x2*/ 0x145142ul,
          /*mode=*/0ul);
      if (res != -1)
        r[1] = res;
      break;
    case 3:
      *(uint64_t*)0x200002c0 = 6;
      *(uint64_t*)0x200002c8 = 0;
      syscall(__NR_cachestat, /*fd=*/r[1], /*cstat_range=*/0x200002c0ul,
              /*cstat=*/0x20000300ul, /*flags=*/0ul);
      break;
    case 4:
      memcpy((void*)0x20000100, "mountinfo\000", 10);
      res = -1;
      res = syz_open_procfs(/*pid=*/-1, /*file=*/0x20000100);
      if (res != -1)
        r[2] = res;
      break;
    case 5:
      memcpy((void*)0x20000a40, "./bus\000", 6);
      res = syscall(__NR_open, /*file=*/0x20000a40ul,
                    /*flags=O_TRUNC|O_SYNC|O_NONBLOCK|O_NOATIME|O_CREAT|O_RDWR*/
                    0x141a42ul,
                    /*mode=*/0ul);
      if (res != -1)
        r[3] = res;
      break;
    case 6:
      memcpy((void*)0x20000040, "/dev/adsp1\000", 11);
      res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                    /*file=*/0x20000040ul,
                    /*flags=O_NOFOLLOW*/ 0x20000ul, /*mode=*/0ul);
      if (res != -1)
        r[4] = res;
      break;
    case 7:
      syscall(__NR_ptrace, /*req=PTRACE_ATTACH*/ 0x10ul, /*pid=*/0, 0, 0);
      break;
    case 8:
      memcpy(
          (void*)0x20000140,
          "\x1d\x7f\x3e\xf3\xf0\xb0\x12\x9f\x8d\x08\x32\x26\x51\x0e\xcc\x07\x13"
          "\xb2\xaf\x6e\x79\x01\xa6\x07\x53\x2f\xa2\xa7\x17\x6f\xef\xdd\x7e\x66"
          "\xe6\x40\x2e\xf8\xb5\x79\xa0\x0d\xd8\x3d\x55\x51\x82\xaf\xa0\x44\xf6"
          "\x5b\x0a\xc6\x68\xc2\x06\x3a\xc3\x3b\x34\xbb\x48\x41\x1c\x11\xd4\x56"
          "\xd5\x84\xec\x41\x40\xae\xbe\x97\xe1\x95\x0a\xd7\xc4\xbd\x2b\xff\xce"
          "\xf1\x75\x62\x5a\x27\xa1\x1f\x55\x9e\x8d\xdb\x03\x1d\x27\xc2\xbe\x3a"
          "\x22\x16\xa1\xe9\xf8\x7f\x5d\x68\xb8\xb0\xb6\x90\xe6\x7b\xfc\xc8\xa8"
          "\xec\x9a\xf9\x98\xc1\xa8\xea\xef\x21\x5c\x77\x1e\x45\xee\xe0\x15\xe8"
          "\xce\x9b\x17\x01\x5d\xa7\x9c\x48\xa7\xb8\x74\x59\xc4\xa8\x87\x81\xff"
          "\xd9\xd1\xec\x68\x70\xc4\xd7\x22\x0f\xfc\x6a\x66\xf7\x82\x8d\xb1\x29"
          "\x7a\xa1\x2e\x00\x50\x3d\xde\x7a\x5c",
          179);
      memcpy((void*)0x20000200,
             "\x99\x46\x65\xd2\xb9\xd5\x23\x9b\x78\x9d\x65\xf6\xec\x18\x4c\x1e"
             "\xa6\x70\x03\xce\x8f\x47\x47\x55\xe4\x39\xf5\x85\x60\xc4\x2a\x24"
             "\x1a\x31\xe5\x40\x47\x9e\x07\x52\xca\xd1\x78\x84\xd9\x02\x4c\xb8"
             "\x54\xdc\x67\x98\xad\xa6\x25\x50\xc8\x26\x4b\x54\x88\xda\xff\x53"
             "\x87\x41\x9b\x22\xf0\x1f\xa5\x76\x30\x31\x7e\x8c\x24\xac\x37\xd8"
             "\x92\xd7\x0e\x38\x0b\x71\x64\xdf\xaa\x88\x6b\x72\xa1\x7f\x08\xdf"
             "\x76\xc1\x05\x7a\x22\x68\xb3\x9a\xad\x4e\x0e\x75\x9e\xef\x1a\xbc"
             "\x6e\x5e\x66\x4e\x7f\x30\x57\xc1\xd7\x0d\x89\x7b\xa5\x10\x46\x64"
             "\xe9\x6d\x92\xc1\xd8\xbd\x42\x0f\x78\x36\x8f\x52\x21\x69\xf7\x13"
             "\xed\x03\x31\x5d\x69\xde\x28\xd7\x7a\xf2\x7e\xc8\x88\x1f\x54\x63"
             "\x3a\x5d\xd5\xd5\x46\x35\xe7\x4a\xd8\xc8\x96\x91\x8c",
             173);
      res = -1;
      res = syz_clone(/*flags=CLONE_IO*/ 0x80000000, /*stack=*/0x20000140,
                      /*stack_len=*/0xb3, /*parentid=*/0x20000080,
                      /*childtid=*/0x200000c0, /*tls=*/0x20000200);
      if (res != -1)
        r[5] = res;
      break;
    case 9:
      syscall(__NR_fcntl, /*fd=*/r[4], /*cmd=*/8ul, /*pid=*/r[5]);
      break;
    case 10:
      syscall(__NR_sendfile, /*fdout=*/r[3], /*fdin=*/r[2], /*off=*/0ul,
              /*count=*/0x100800001ul);
      break;
    case 11:
      syscall(__NR_sendfile, /*fdout=*/r[0], /*fdin=*/r[1], /*off=*/0ul,
              /*count=*/0x1000000201003ul);
      break;
  }
}
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;
}

repro.txt

syz_mount_image$nilfs2(&(0x7f0000000000), &(0x7f0000000a80)='./file0\x00', 0x808, &(0x7f00000000c0)=ANY=[], 0x1, 0xa4a, &(0x7f0000001540)="$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")
r0 = open(&(0x7f0000000000)='./bus\x00', 0x0, 0x0) (async)
r1 = open(&(0x7f0000007f80)='./bus\x00', 0x145142, 0x0)
cachestat(r1, &(0x7f00000002c0)={0x6}, &(0x7f0000000300), 0x0) (async)
r2 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000100)='mountinfo\x00') (async)
r3 = open(&(0x7f0000000a40)='./bus\x00', 0x141a42, 0x0)
r4 = openat$adsp1(0xffffffffffffff9c, &(0x7f0000000040), 0x20000, 0x0) (async)
ptrace(0x10, 0x0) (async)
r5 = syz_clone(0x80000000, &(0x7f0000000140)="1d7f3ef3f0b0129f8d083226510ecc0713b2af6e7901a607532fa2a7176fefdd7e66e6402ef8b579a00dd83d555182afa044f65b0ac668c2063ac33b34bb48411c11d456d584ec4140aebe97e1950ad7c4bd2bffcef175625a27a11f559e8ddb031d27c2be3a2216a1e9f87f5d68b8b0b690e67bfcc8a8ec9af998c1a8eaef215c771e45eee015e8ce9b17015da79c48a7b87459c4a88781ffd9d1ec6870c4d7220ffc6a66f7828db1297aa12e00503dde7a5c", 0xb3, &(0x7f0000000080), &(0x7f00000000c0), &(0x7f0000000200)="994665d2b9d5239b789d65f6ec184c1ea67003ce8f474755e439f58560c42a241a31e540479e0752cad17884d9024cb854dc6798ada62550c8264b5488daff5387419b22f01fa57630317e8c24ac37d892d70e380b7164dfaa886b72a17f08df76c1057a2268b39aad4e0e759eef1abc6e5e664e7f3057c1d70d897ba5104664e96d92c1d8bd420f78368f522169f713ed03315d69de28d77af27ec8881f54633a5dd5d54635e74ad8c896918c")
fcntl$setown(r4, 0x8, r5) (async)
sendfile(r3, r2, 0x0, 0x100800001) (async)
sendfile(r0, r1, 0x0, 0x1000000201003)