// https://syzkaller.appspot.com/bug?id=2196001e8447f2133532abeabaea2ebc0351f67b
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <sys/types.h>

#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/endian.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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 execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      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;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(SYS_socket, 0x1c, 1, 0x84);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint8_t*)0x10000000 = 0x1c);
  NONFAILING(*(uint8_t*)0x10000001 = 0x1c);
  NONFAILING(*(uint16_t*)0x10000002 = htobe16(0x4e22 + procid * 4));
  NONFAILING(*(uint32_t*)0x10000004 = 0);
  NONFAILING(*(uint8_t*)0x10000008 = 0);
  NONFAILING(*(uint8_t*)0x10000009 = 0);
  NONFAILING(*(uint8_t*)0x1000000a = 0);
  NONFAILING(*(uint8_t*)0x1000000b = 0);
  NONFAILING(*(uint8_t*)0x1000000c = 0);
  NONFAILING(*(uint8_t*)0x1000000d = 0);
  NONFAILING(*(uint8_t*)0x1000000e = 0);
  NONFAILING(*(uint8_t*)0x1000000f = 0);
  NONFAILING(*(uint8_t*)0x10000010 = 0);
  NONFAILING(*(uint8_t*)0x10000011 = 0);
  NONFAILING(*(uint8_t*)0x10000012 = 0);
  NONFAILING(*(uint8_t*)0x10000013 = 0);
  NONFAILING(*(uint8_t*)0x10000014 = 0);
  NONFAILING(*(uint8_t*)0x10000015 = 0);
  NONFAILING(*(uint8_t*)0x10000016 = 0);
  NONFAILING(*(uint8_t*)0x10000017 = 0);
  NONFAILING(*(uint32_t*)0x10000018 = 0);
  syscall(SYS_bind, (intptr_t)r[0], 0x10000000, 0x1c);
  NONFAILING(*(uint8_t*)0x10000180 = 0x1c);
  NONFAILING(*(uint8_t*)0x10000181 = 0x1c);
  NONFAILING(*(uint16_t*)0x10000182 = htobe16(0x4e22 + procid * 4));
  NONFAILING(*(uint32_t*)0x10000184 = 0);
  NONFAILING(*(uint64_t*)0x10000188 = htobe64(0));
  NONFAILING(*(uint64_t*)0x10000190 = htobe64(1));
  NONFAILING(*(uint32_t*)0x10000198 = 0);
  syscall(SYS_connect, (intptr_t)r[0], 0x10000180, 0x1c);
  NONFAILING(*(uint32_t*)0x10000080 = 0);
  NONFAILING(*(uint32_t*)0x10000084 = 0);
  NONFAILING(*(uint32_t*)0x10000088 = 0);
  NONFAILING(*(uint32_t*)0x1000008c = 0);
  NONFAILING(*(uint32_t*)0x10000090 = 0);
  NONFAILING(*(uint32_t*)0x10000094 = 0x60);
  NONFAILING(*(uint32_t*)0x10000098 = 0);
  syscall(SYS_sendmsg, (intptr_t)r[0], 0x10000080, 0x10c);
  NONFAILING(*(uint32_t*)0x100000c0 = 0xbd);
  NONFAILING(*(uint32_t*)0x100000c4 = 0);
  syscall(SYS_setsockopt, (intptr_t)r[0], 0xffff, 0x80, 0x100000c0, 8);
}
int main(void)
{
  syscall(SYS_mmap, 0x10000000, 0x1000000, 7, 0x1012, -1, 0);
  install_segv_handler();
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}