// https://syzkaller.appspot.com/bug?id=f0950f973db470e1c7c8d8693fbc545950666ab1
// 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/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>

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;
  for (i = 0; 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);
}

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_RELAXED))
      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;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (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) {
  }
}

#define SYZ_HAVE_SETUP_TEST 1
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)
{
  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, 45);
      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;
  for (iter = 0;; 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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

#ifndef __NR_lseek
#define __NR_lseek 19
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    memcpy((void*)0x200003c0,
           "\000\000\000\000\000egy\305\216\313\034\370\217\312;\243?"
           "\255\256\017\265\227ao3\253\315Y\232\343\345\341\364\207\254\255"
           "\200\243P\214\352\234\307\000\353\355X#\3434\200O]"
           "\207\335\2114\332l;w\370\370\v?v\360\270\332=|\244\272\273iq!"
           "\330g\267I\022\200",
           84);
    res = syz_open_procfs(0, 0x200003c0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    memcpy((void*)0x200009c0,
           "mem\000\001y7SwaS."
           "\006ur\211\311B\253\343\372rent\000\252\032\375\256\v\277\330d\273"
           "\2579Q\336\373\037Y\373\215o\321\026\316(\202\361\277{"
           "5Z\023\025\024\327\270\316\3620\036\300\302\355<?"
           "\307\266s\312\377\226\232}+Q\322\331{"
           "\312\206Vw\336\263\206\221\375\265p\333$ "
           "j\373\370\355w\364\0261a.\307\n\340X?\304\364BW\001\037-"
           "\314\001\320W\310\3609\fV\033|A)\270\332#NP\034\235\223#V\237\"Kgn{"
           "\226\252\2750\216f\235\2708CP(}w\214\273\334%\ax "
           "\020\321\n(\250="
           "\3654\251\313\351\227T\317\317\207t\201\372\252\3630\213\267\352"
           "\374^\266\225\207E\021\211\177\240m\323&"
           "\tHvtD\203\\6\340t\250\335\243\244\322\271\271{+\035\243\325Z;]*"
           "2\231Os\bVW5\346\347\333\225\215\377Y\340s\177\236K,\256\256X\025M@"
           "\335\004`\352\003\367\177:\310HU3\253X}\247S8s\333_"
           "\305\234\311Rw\220G\363J\234\217\221\241\326\0055?"
           "m\355\224\234\267(\017\323\274\272\306T\335\025\367+*Z3\216_"
           "Z\243k\344R\036\310\vYV\212\215\255\214I\210\fM\031JX\037\377e#|"
           "\006\37286\313\223\352\253\314\2064fC*I\177M\t7\224}"
           "\006\035\303\234o-\335\246\033\250_\037Bl\304:"
           "\256\3764\236\251T\221\331w\005\370{\326@",
           395);
    syscall(__NR_openat, (intptr_t)r[0], 0x200009c0, 0, 0);
    break;
  case 2:
    memcpy((void*)0x20000040, "fd/4\000", 5);
    res = syz_open_procfs(0, 0x20000040);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    syscall(__NR_lseek, (intptr_t)r[1], 0x20400000, 0);
    break;
  case 4:
    *(uint32_t*)0x20000080 = 0xf;
    *(uint8_t*)0x20000084 = 0x1f;
    *(uint16_t*)0x20000085 = 0;
    *(uint64_t*)0x20000087 = 0;
    syscall(__NR_write, (intptr_t)r[1], 0x20000080, 0x2000008f);
    break;
  case 5:
    syscall(__NR_mmap, 0x20000000, 0xe7e000, 0, 0x31, -1, 0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}