// https://syzkaller.appspot.com/bug?id=a80e74a9109b76b5b3e6cbe79fe9a23fbbefcfc2
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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 int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

static const char* setup_fault()
{
  int fd = open("/proc/self/make-it-fail", O_WRONLY);
  if (fd == -1)
    return "CONFIG_FAULT_INJECTION is not enabled";
  close(fd);
  fd = open("/proc/thread-self/fail-nth", O_WRONLY);
  if (fd == -1)
    return "kernel does not have systematic fault injection support";
  close(fd);
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        return "failed to write fault injection file";
    }
  }
  return NULL;
}

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

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;
  if ((reason = setup_fault()))
    printf("the reproducer may not work as expected: fault injection setup "
           "failed: %s\n",
           reason);
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  socket$inet6_tcp arguments: [
  //    domain: const = 0xa (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_tcp6
  res = syscall(__NR_socket, /*domain=*/0xaul, /*type=*/1ul, /*proto=*/0);
  if (res != -1)
    r[0] = res;
  //  close arguments: [
  //    fd: fd (resource)
  //  ]
  syscall(__NR_close, /*fd=*/r[0]);
  //  socket$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[1] = res;
  //  setsockopt$inet6_tcp_int arguments: [
  //    fd: sock_tcp6 (resource)
  //    level: const = 0x6 (4 bytes)
  //    optname: tcp_option_types_int = 0x1e (4 bytes)
  //    optval: ptr[in, int32] {
  //      int32 = 0x400000001 (4 bytes)
  //    }
  //    optlen: len = 0xc2 (8 bytes)
  //  ]
  *(uint32_t*)0x200000000180 = 1;
  syscall(__NR_setsockopt, /*fd=*/r[0], /*level=*/6,
          /*optname=TCP_FASTOPEN_CONNECT*/ 0x1e, /*optval=*/0x200000000180ul,
          /*optlen=*/0xc2ul);
  //  setsockopt$inet6_tcp_int arguments: [
  //    fd: sock_tcp6 (resource)
  //    level: const = 0x6 (4 bytes)
  //    optname: tcp_option_types_int = 0x2000000000000022 (4 bytes)
  //    optval: ptr[in, int32] {
  //      int32 = 0x1 (4 bytes)
  //    }
  //    optlen: len = 0x4 (8 bytes)
  //  ]
  *(uint32_t*)0x200000000000 = 1;
  syscall(__NR_setsockopt, /*fd=*/r[1], /*level=*/6,
          /*optname=TCP_FASTOPEN_NO_COOKIE*/ 0x22, /*optval=*/0x200000000000ul,
          /*optlen=*/4ul);
  //  connect$inet6 arguments: [
  //    fd: sock_in6 (resource)
  //    addr: ptr[in, sockaddr_in6] {
  //      sockaddr_in6 {
  //        family: const = 0xa (2 bytes)
  //        port: int16be = 0x0 (2 bytes)
  //        flow: int32be = 0x0 (4 bytes)
  //        addr: union ipv6_addr {
  //          ipv4: ipv6_addr_ipv4 {
  //            a0: buffer: {00 00 00 00 00 00 00 00 00 00} (length 0xa)
  //            a1: buffer: {ff ff} (length 0x2)
  //            a3: union ipv4_addr {
  //              local: ipv4_addr_t[const[170, int8]] {
  //                a0: const = 0xac (1 bytes)
  //                a1: const = 0x14 (1 bytes)
  //                a2: const = 0x14 (1 bytes)
  //                a3: const = 0xaa (1 bytes)
  //              }
  //            }
  //          }
  //        }
  //        scope: int32 = 0x2000000b (4 bytes)
  //      }
  //    }
  //    addrlen: len = 0x1c (8 bytes)
  //  ]
  *(uint16_t*)0x200000000240 = 0xa;
  *(uint16_t*)0x200000000242 = htobe16(0);
  *(uint32_t*)0x200000000244 = htobe32(0);
  memset((void*)0x200000000248, 0, 10);
  memset((void*)0x200000000252, 255, 2);
  *(uint8_t*)0x200000000254 = 0xac;
  *(uint8_t*)0x200000000255 = 0x14;
  *(uint8_t*)0x200000000256 = 0x14;
  *(uint8_t*)0x200000000257 = 0xaa;
  *(uint32_t*)0x200000000258 = 0x2000000b;
  syscall(__NR_connect, /*fd=*/r[0], /*addr=*/0x200000000240ul,
          /*addrlen=*/0x1cul);
  //  sendto$inet6 arguments: [
  //    fd: sock_in6 (resource)
  //    buf: nil
  //    len: len = 0x0 (8 bytes)
  //    f: send_flags = 0x0 (8 bytes)
  //    addr: nil
  //    addrlen: len = 0x0 (8 bytes)
  //  ]
  inject_fault(1);
  syscall(__NR_sendto, /*fd=*/r[0], /*buf=*/0ul, /*len=*/0ul, /*f=*/0ul,
          /*addr=*/0ul, /*addrlen=*/0ul);
  return 0;
}