// https://syzkaller.appspot.com/bug?id=6b53effa5234d16dc2c55e1e8dafc63ba776be90
// 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>

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 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)) {
  }
  //  socket$inet6_mptcp arguments: [
  //    domain: const = 0xa (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x106 (4 bytes)
  //  ]
  //  returns sock_mptcp6
  res = syscall(__NR_socket, /*domain=*/0xaul, /*type=*/1ul, /*proto=*/0x106);
  if (res != -1)
    r[0] = res;
  //  connect$inet6 arguments: [
  //    fd: sock_in6 (resource)
  //    addr: ptr[in, sockaddr_in6] {
  //      sockaddr_in6 {
  //        family: const = 0xa (2 bytes)
  //        port: int16be = 0x4001 (2 bytes)
  //        flow: int32be = 0xfffffffc (4 bytes)
  //        addr: union ipv6_addr {
  //          loopback: ipv6_addr_loopback {
  //            a0: const = 0x0 (8 bytes)
  //            a1: const = 0x1 (8 bytes)
  //          }
  //        }
  //        scope: int32 = 0xfffffffa (4 bytes)
  //      }
  //    }
  //    addrlen: len = 0x1c (8 bytes)
  //  ]
  *(uint16_t*)0x200000000040 = 0xa;
  *(uint16_t*)0x200000000042 = htobe16(0x4001);
  *(uint32_t*)0x200000000044 = htobe32(0xfffffffc);
  *(uint64_t*)0x200000000048 = htobe64(0);
  *(uint64_t*)0x200000000050 = htobe64(1);
  *(uint32_t*)0x200000000058 = 0xfffffffa;
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000040ul,
          /*addrlen=*/0x1cul);
  //  connect$unix arguments: [
  //    fd: sock_unix (resource)
  //    addr: ptr[in, sockaddr_un] {
  //      union sockaddr_un {
  //        file: sockaddr_un_file {
  //          family: unix_socket_family = 0x0 (2 bytes)
  //          path: buffer: {2e 2f 66 69 6c 65 30 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00} (length 0x6c)
  //        }
  //      }
  //    }
  //    addrlen: len = 0x6e (8 bytes)
  //  ]
  *(uint16_t*)0x20000057eff8 = 0;
  memcpy((void*)0x20000057effa,
         "./"
         "file0\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
         108);
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x20000057eff8ul,
          /*addrlen=*/0x6eul);
  //  connect$inet6 arguments: [
  //    fd: sock_in6 (resource)
  //    addr: nil
  //    addrlen: len = 0x0 (8 bytes)
  //  ]
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0ul, /*addrlen=*/0ul);
}
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;
}