// https://syzkaller.appspot.com/bug?id=558f316bcf2ef05dfb52fdc87c552bcb0f2f5bcd
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

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");
}

#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);
}

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[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$auto_tracing_buffers_fops_trace arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 73 79 73 2f 6b 65 72 6e 65 6c 2f 74 72 61 63 69 6e 67 2f
  //      70 65 72 5f 63 70 75 2f 63 70 75 30 2f 74 72 61 63 65 5f 70 69 70 65
  //      5f 72 61 77 00} (length 0x30)
  //    }
  //    flags: open_flags = 0x1000 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_tracing_buffers_fops_trace
  memcpy((void*)0x200000000080,
         "/sys/kernel/tracing/per_cpu/cpu0/trace_pipe_raw\000", 48);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000080ul, /*flags=*/0x1000, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  mmap$auto_tracing_buffers_fops_trace arguments: [
  //    addr: VMA[0x4000]
  //    len: len = 0x4000 (8 bytes)
  //    prot: mmap_prot = 0x1 (8 bytes)
  //    flags: mmap_flags = 0x8e051 (8 bytes)
  //    fd: fd_tracing_buffers_fops_trace (resource)
  //    offset: intptr = 0x0 (8 bytes)
  //  ]
  syscall(
      __NR_mmap, /*addr=*/0x200000ffc000ul, /*len=*/0x4000ul,
      /*prot=PROT_READ*/ 1ul,
      /*flags=MAP_SYNC|MAP_POPULATE|MAP_NORESERVE|MAP_LOCKED|MAP_FIXED|0x41*/
      0x8e051ul, /*fd=*/r[0], /*offset=*/0ul);
  //  openat$auto_sg_fops_sg arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: nil
  //    flags: open_flags = 0x1a5d80 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_sg_fops_sg
  syscall(
      __NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0ul,
      /*flags=O_SYNC|O_NONBLOCK|O_NOFOLLOW|O_NOCTTY|O_EXCL|O_DIRECT|0x80400*/
      0x1a5d80, /*mode=*/0);
  //  madvise$auto arguments: [
  //    start: intptr = 0x0 (8 bytes)
  //    len_in: intptr = 0x7fffffffffffffff (8 bytes)
  //    behavior: int32 = 0xb (4 bytes)
  //  ]
  syscall(__NR_madvise, /*start=*/0ul, /*len_in=*/0x7ffffffffffffffful,
          /*behavior=*/0xb);
  //  syz_clone arguments: [
  //    flags: clone_flags = 0x5005480 (8 bytes)
  //    stack: nil
  //    stack_len: bytesize = 0x0 (8 bytes)
  //    parentid: nil
  //    childtid: nil
  //    tls: nil
  //  ]
  //  returns pid
  syz_clone(
      /*flags=CLONE_NEWTIME|CLONE_PIDFD|CLONE_NEWUTS|CLONE_CHILD_SETTID|CLONE_VFORK|CLONE_FILES*/
      0x5005480, /*stack=*/0, /*stack_len=*/0, /*parentid=*/0, /*childtid=*/0,
      /*tls=*/0);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*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=*/0x200001000000ul, /*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;
}