// https://syzkaller.appspot.com/bug?id=bae0fd140352e4b5d8b65f3ec3c50bcd3ffc7a13
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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>

#ifndef __NR_dup
#define __NR_dup 23
#endif
#ifndef __NR_getpid
#define __NR_getpid 172
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 29
#endif
#ifndef __NR_madvise
#define __NR_madvise 233
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif
#ifndef __NR_pidfd_open
#define __NR_pidfd_open 434
#endif
#ifndef __NR_process_madvise
#define __NR_process_madvise 440
#endif

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 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");
}

static long syz_pidfd_open(volatile long pid, volatile long flags)
{
  if (pid == 1) {
    pid = 0;
  }
  return syscall(__NR_pidfd_open, pid, flags);
}

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[5] = {0x0, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  getpid arguments: [
  //  ]
  //  returns pid
  res = syscall(__NR_getpid);
  if (res != -1)
    r[0] = res;
  //  syz_pidfd_open arguments: [
  //    pid: pid (resource)
  //    flags: const = 0x0 (8 bytes)
  //  ]
  //  returns fd_pidfd
  res = -1;
  res = syz_pidfd_open(/*pid=*/r[0], /*flags=*/0);
  if (res != -1)
    r[1] = res;
  //  openat$nullb arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6e 75 6c 6c 62 30 00} (length 0xc)
  //    }
  //    flags: open_flags = 0x1e9802 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_block
  memcpy((void*)0x20001000, "/dev/nullb0\000", 12);
  res = syscall(
      __NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20001000ul,
      /*flags=O_SYNC|O_NONBLOCK|O_NOFOLLOW|O_NOATIME|O_LARGEFILE|O_CLOEXEC|0x2*/
      0x1e9802, /*mode=*/0);
  if (res != -1)
    r[2] = res;
  //  ioctl$BLKBSZSET arguments: [
  //    fd: fd_block (resource)
  //    cmd: const = 0x40081271 (4 bytes)
  //    arg: ptr[in, intptr] {
  //      intptr = 0x10000 (8 bytes)
  //    }
  //  ]
  *(uint64_t*)0x20000100 = 0x10000;
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x40081271, /*arg=*/0x20000100ul);
  //  openat$nullb arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6e 75 6c 6c 62 30 00} (length 0xc)
  //    }
  //    flags: open_flags = 0x282 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_block
  memcpy((void*)0x20000000, "/dev/nullb0\000", 12);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000000ul,
                /*flags=O_TRUNC|O_EXCL|O_RDWR*/ 0x282, /*mode=*/0);
  if (res != -1)
    r[3] = res;
  //  dup arguments: [
  //    oldfd: fd (resource)
  //  ]
  //  returns fd
  res = syscall(__NR_dup, /*oldfd=*/r[3]);
  if (res != -1)
    r[4] = res;
  //  mmap arguments: [
  //    addr: VMA[0xb36000]
  //    len: len = 0xb36000 (8 bytes)
  //    prot: mmap_prot = 0x2000007 (8 bytes)
  //    flags: mmap_flags = 0x38011 (8 bytes)
  //    fd: fd (resource)
  //    offset: intptr = 0x0 (8 bytes)
  //  ]
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0xb36000ul,
          /*prot=PROT_GROWSUP|PROT_WRITE|PROT_READ|PROT_EXEC*/ 0x2000007ul,
          /*flags=MAP_STACK|MAP_POPULATE|MAP_NONBLOCK|MAP_FIXED|0x1*/ 0x38011ul,
          /*fd=*/r[4], /*offset=*/0ul);
  //  madvise arguments: [
  //    addr: VMA[0x800000]
  //    len: len = 0x800000 (8 bytes)
  //    advice: madvise_flags = 0xe (8 bytes)
  //  ]
  syscall(__NR_madvise, /*addr=*/0x20000000ul, /*len=*/0x800000ul,
          /*advice=MADV_HUGEPAGE*/ 0xeul);
  //  process_madvise arguments: [
  //    pidfd: fd_pidfd (resource)
  //    vec: ptr[in, array[iovec[in, array[int8]]]] {
  //      array[iovec[in, array[int8]]] {
  //        iovec[in, array[int8]] {
  //          addr: ptr[in, buffer] {
  //            buffer: {96} (length 0x1)
  //          }
  //          len: len = 0x1 (8 bytes)
  //        }
  //      }
  //    }
  //    vlen: len = 0x1 (8 bytes)
  //    advice: madvise_flags = 0x65 (8 bytes)
  //    flags: const = 0x0 (8 bytes)
  //  ]
  *(uint64_t*)0x200015c0 = 0x20000000;
  memset((void*)0x20000000, 150, 1);
  *(uint64_t*)0x200015c8 = 1;
  syscall(__NR_process_madvise, /*pidfd=*/r[1], /*vec=*/0x200015c0ul,
          /*vlen=*/1ul, /*advice=MADV_SOFT_OFFLINE*/ 0x65ul, /*flags=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-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=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}