// https://syzkaller.appspot.com/bug?id=f19c739297d123ec7293c6cd27cb4aae786c8142
// 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 <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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>

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 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");
}

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)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 6; 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);
      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++) {
    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 (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  openat$dm_control arguments: [
    //    fd: const = 0xffffffffffffff9c (8 bytes)
    //    file: ptr[in, buffer] {
    //      buffer: {2f 64 65 76 2f 6d 61 70 70 65 72 2f 63 6f 6e 74 72 6f 6c
    //      00} (length 0x14)
    //    }
    //    flags: open_flags = 0x2 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd_dm_ctl
    memcpy((void*)0x200000000740, "/dev/mapper/control\000", 20);
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x200000000740ul, /*flags=O_RDWR*/ 2, /*mode=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  ioctl$DM_DEV_CREATE arguments: [
    //    fd: fd_dm_ctl (resource)
    //    cmd: const = 0xc138fd03 (4 bytes)
    //    arg: ptr[inout, dm_ioctl_t[dm_id_create, void, const[0, int32],
    //    const[0, int32]]] {
    //      dm_ioctl_t[dm_id_create, void, const[0, int32], const[0, int32]] {
    //        version_major: const = 0x4 (4 bytes)
    //        version_minor: const = 0x0 (4 bytes)
    //        version_patch: const = 0x0 (4 bytes)
    //        data_size: bytesize = 0x138 (4 bytes)
    //        data_start: offsetof = 0x138 (4 bytes)
    //        target_count: const = 0x0 (4 bytes)
    //        open_count: const = 0x0 (4 bytes)
    //        flags: dm_ioctl_flags = 0x0 (4 bytes)
    //        event_nr: const = 0x0 (4 bytes)
    //        padding: const = 0x0 (4 bytes)
    //        id: dm_id_create {
    //          dev: dm_dev_number (resource)
    //          name: dm_dev_name {
    //            prefix: buffer: {73 79 7a} (length 0x3)
    //            proc: proc = 0x0 (1 bytes)
    //            slot: buffer: {30 00} (length 0x2)
    //            pad = 0x0 (122 bytes)
    //          }
    //          uuid: union dm_dev_uuid_opt {
    //            none: const = 0x0 (1 bytes)
    //          }
    //        }
    //        data: buffer: {} (length 0x0)
    //      }
    //    }
    //  ]
    *(uint32_t*)0x200000000780 = 4;
    *(uint32_t*)0x200000000784 = 0;
    *(uint32_t*)0x200000000788 = 0;
    *(uint32_t*)0x20000000078c = 0x138;
    *(uint32_t*)0x200000000790 = 0x138;
    *(uint32_t*)0x200000000794 = 0;
    *(uint32_t*)0x200000000798 = 0;
    *(uint32_t*)0x20000000079c = 0;
    *(uint32_t*)0x2000000007a0 = 0;
    *(uint32_t*)0x2000000007a4 = 0;
    memcpy((void*)0x2000000007b0, "syz", 3);
    *(uint8_t*)0x2000000007b3 = 0x61 + procid * 1;
    memcpy((void*)0x2000000007b4, "0\000", 2);
    *(uint8_t*)0x200000000830 = 0;
    res = syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc138fd03,
                  /*arg=*/0x200000000780ul);
    if (res != -1)
      r[1] = *(uint64_t*)0x2000000007a8;
    break;
  case 2:
    //  openat$dm_control arguments: [
    //    fd: const = 0xffffffffffffff9c (8 bytes)
    //    file: ptr[in, buffer] {
    //      buffer: {2f 64 65 76 2f 6d 61 70 70 65 72 2f 63 6f 6e 74 72 6f 6c
    //      00} (length 0x14)
    //    }
    //    flags: open_flags = 0x109000 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd_dm_ctl
    memcpy((void*)0x2000000008c0, "/dev/mapper/control\000", 20);
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x2000000008c0ul,
                  /*flags=O_SYNC|O_LARGEFILE*/ 0x109000, /*mode=*/0);
    if (res != -1)
      r[2] = res;
    break;
  case 3:
    //  ioctl$DM_TABLE_LOAD arguments: [
    //    fd: fd_dm_ctl (resource)
    //    cmd: const = 0xc138fd09 (4 bytes)
    //    arg: ptr[inout, dm_ioctl_t[dm_id_lookup, array[dm_target, 1],
    //    len[data, int32], const[0, int32]]] {
    //      dm_ioctl_t[dm_id_lookup, array[dm_target, 1], len[data, int32],
    //      const[0, int32]] {
    //        version_major: const = 0x4 (4 bytes)
    //        version_minor: const = 0x0 (4 bytes)
    //        version_patch: const = 0x0 (4 bytes)
    //        data_size: bytesize = 0x1c0 (4 bytes)
    //        data_start: offsetof = 0x138 (4 bytes)
    //        target_count: len = 0x1 (4 bytes)
    //        open_count: const = 0x0 (4 bytes)
    //        flags: dm_ioctl_flags = 0x0 (4 bytes)
    //        event_nr: const = 0x0 (4 bytes)
    //        padding: const = 0x0 (4 bytes)
    //        id: union dm_id_lookup {
    //          by_dev: dm_id_by_dev {
    //            dev: dm_dev_number (resource)
    //            pad = 0x0 (264 bytes)
    //          }
    //        }
    //        data: array[dm_target] {
    //          union dm_target {
    //            cache: dm_target_spec_t[dm_target_cache, dm_cache_params] {
    //              sector_start: const = 0x0 (8 bytes)
    //              length: dm_lengths = 0x1008 (8 bytes)
    //              status: const = 0x0 (4 bytes)
    //              next: bytesize = 0x88 (4 bytes)
    //              target_type: buffer: {63 61 63 68 65 00 00 00 00 00 00 00 00
    //              00 00 00} (length 0x10) params: dm_cache_params {
    //                meta: union dm_dev {
    //                  ram_num: dm_ram_num {
    //                    major: buffer: {31 3a} (length 0x2)
    //                    minor: proc = 0x1 (20 bytes)
    //                  }
    //                }
    //                sp0: const = 0x20 (1 bytes)
    //                cache: union dm_dev {
    //                  ram_num: dm_ram_num {
    //                    major: buffer: {31 3a} (length 0x2)
    //                    minor: proc = 0x1 (20 bytes)
    //                  }
    //                }
    //                sp1: const = 0x20 (1 bytes)
    //                origin: union dm_dev {
    //                  ram: dm_dev_proc_t["/dev/ram", 2] {
    //                    prefix: buffer: {2f 64 65 76 2f 72 61 6d} (length 0x8)
    //                    id: proc = 0x0 (1 bytes)
    //                  }
    //                }
    //                sp2: const = 0x20 (1 bytes)
    //                bsize: buffer: {35 31 32} (length 0x3)
    //                sp3: const = 0x20 (1 bytes)
    //                feat: buffer: {32 20 6d 65 74 61 64 61 74 61 32 20 77 72
    //                69 74 65 74 68 72 6f 75 67 68} (length 0x18) sp4: const =
    //                0x20 (1 bytes) policy: buffer: {64 65 66 61 75 6c 74 20
    //                30} (length 0x9)
    //              }
    //              z: const = 0x0 (1 bytes)
    //            }
    //          }
    //        }
    //      }
    //    }
    //  ]
    *(uint32_t*)0x200000000900 = 4;
    *(uint32_t*)0x200000000904 = 0;
    *(uint32_t*)0x200000000908 = 0;
    *(uint32_t*)0x20000000090c = 0x1c0;
    *(uint32_t*)0x200000000910 = 0x138;
    *(uint32_t*)0x200000000914 = 1;
    *(uint32_t*)0x200000000918 = 0;
    *(uint32_t*)0x20000000091c = 0;
    *(uint32_t*)0x200000000920 = 0;
    *(uint32_t*)0x200000000924 = 0;
    *(uint64_t*)0x200000000928 = r[1];
    *(uint64_t*)0x200000000a38 = 0;
    *(uint64_t*)0x200000000a40 = 0x1008;
    *(uint32_t*)0x200000000a48 = 0;
    *(uint32_t*)0x200000000a4c = 0x88;
    memcpy((void*)0x200000000a50,
           "cache\000\000\000\000\000\000\000\000\000\000\000", 16);
    memcpy((void*)0x200000000a60, "1:", 2);
    sprintf((char*)0x200000000a62, "%020llu", (long long)1 + procid * 2);
    *(uint8_t*)0x200000000a76 = 0x20;
    memcpy((void*)0x200000000a77, "1:", 2);
    sprintf((char*)0x200000000a79, "%020llu", (long long)1 + procid * 2);
    *(uint8_t*)0x200000000a8d = 0x20;
    memcpy((void*)0x200000000a8e, "/dev/ram", 8);
    *(uint8_t*)0x200000000a96 = 0x30 + procid * 2;
    *(uint8_t*)0x200000000a97 = 0x20;
    memcpy((void*)0x200000000a98, "512", 3);
    *(uint8_t*)0x200000000a9b = 0x20;
    memcpy((void*)0x200000000a9c, "2 metadata2 writethrough", 24);
    *(uint8_t*)0x200000000ab4 = 0x20;
    memcpy((void*)0x200000000ab5, "default 0", 9);
    *(uint8_t*)0x200000000abe = 0;
    syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0xc138fd09,
            /*arg=*/0x200000000900ul);
    break;
  case 4:
    //  openat$dm_control arguments: [
    //    fd: const = 0xffffffffffffff9c (8 bytes)
    //    file: ptr[in, buffer] {
    //      buffer: {2f 64 65 76 2f 6d 61 70 70 65 72 2f 63 6f 6e 74 72 6f 6c
    //      00} (length 0x14)
    //    }
    //    flags: open_flags = 0x2 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd_dm_ctl
    memcpy((void*)0x200000000000, "/dev/mapper/control\000", 20);
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x200000000000ul, /*flags=O_RDWR*/ 2, /*mode=*/0);
    if (res != -1)
      r[3] = res;
    break;
  case 5:
    //  ioctl$DM_DEV_SUSPEND arguments: [
    //    fd: fd_dm_ctl (resource)
    //    cmd: const = 0xc138fd06 (4 bytes)
    //    arg: ptr[inout, dm_ioctl_t[dm_id_lookup, void, const[0, int32],
    //    const[0, int32]]] {
    //      dm_ioctl_t[dm_id_lookup, void, const[0, int32], const[0, int32]] {
    //        version_major: const = 0x4 (4 bytes)
    //        version_minor: const = 0x0 (4 bytes)
    //        version_patch: const = 0x0 (4 bytes)
    //        data_size: bytesize = 0x138 (4 bytes)
    //        data_start: offsetof = 0x138 (4 bytes)
    //        target_count: const = 0x0 (4 bytes)
    //        open_count: const = 0x0 (4 bytes)
    //        flags: dm_ioctl_flags = 0x0 (4 bytes)
    //        event_nr: const = 0x0 (4 bytes)
    //        padding: const = 0x0 (4 bytes)
    //        id: union dm_id_lookup {
    //          by_name: dm_id_by_name {
    //            dev: dm_dev_number (resource)
    //            name: dm_dev_name {
    //              prefix: buffer: {73 79 7a} (length 0x3)
    //              proc: proc = 0x0 (1 bytes)
    //              slot: buffer: {30 00} (length 0x2)
    //              pad = 0x0 (122 bytes)
    //            }
    //            pad = 0x0 (136 bytes)
    //          }
    //        }
    //        data: buffer: {} (length 0x0)
    //      }
    //    }
    //  ]
    *(uint32_t*)0x2000000004c0 = 4;
    *(uint32_t*)0x2000000004c4 = 0;
    *(uint32_t*)0x2000000004c8 = 0;
    *(uint32_t*)0x2000000004cc = 0x138;
    *(uint32_t*)0x2000000004d0 = 0x138;
    *(uint32_t*)0x2000000004d4 = 0;
    *(uint32_t*)0x2000000004d8 = 0;
    *(uint32_t*)0x2000000004dc = 0;
    *(uint32_t*)0x2000000004e0 = 0;
    *(uint32_t*)0x2000000004e4 = 0;
    memcpy((void*)0x2000000004f0, "syz", 3);
    *(uint8_t*)0x2000000004f3 = 0x61 + procid * 1;
    memcpy((void*)0x2000000004f4, "0\000", 2);
    syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0xc138fd06,
            /*arg=*/0x2000000004c0ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}