// https://syzkaller.appspot.com/bug?id=bda19bf6b14e7fddccf28ac6f0205c7df6d8c32e
// 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 __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (sig == SIGBUS)
    valid = 1;
  if (skip && valid) {
    _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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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 = 0;
  for (;; 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 (;;) {
      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)) {
  }
  syscall(SYS_sysarch, /*cmd=*/0x84ul, /*args=*/0ul);
  syscall(SYS_freebsd10_pipe, /*pipefd=*/0ul);
  syscall(SYS_ksem_open, /*idp=*/0ul, /*name=*/0ul, /*oflag=*/0ul, /*mode=*/0ul,
          /*value=*/0);
  res = syscall(SYS_socket, /*domain=*/0x1cul, /*type=SOCK_STREAM*/ 1ul,
                /*proto=*/0x84);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x20000140 = 0x100003);
  syscall(SYS_setsockopt, /*fd=*/r[0], /*level=*/0x84, /*opt=*/0x1b,
          /*val=*/0x20000140ul, /*len=*/4ul);
  NONFAILING(
      memcpy((void*)0x20000100,
             "\xf6\x31\x61\x6a\x68\x6d\xd4\xe0\xc6\x00\xe5\xac\xdb\x29\x97\x36"
             "\xd0\xe5\x54\x9b\xc8\xfe\xa3\xd9\xde\xae\xea\xef\x6c\xdf\xf9\x99"
             "\x9d\x08\x8e\xa5\xcf\xb1\x3e\x32\x9e\xc3\x54\x57\x48",
             45));
  NONFAILING(*(uint8_t*)0x20000280 = 0x1c);
  NONFAILING(*(uint8_t*)0x20000281 = 0x1c);
  NONFAILING(*(uint16_t*)0x20000282 = htobe16(0x4e22));
  NONFAILING(*(uint32_t*)0x20000284 = 0);
  NONFAILING(*(uint8_t*)0x20000288 = 0xfe);
  NONFAILING(*(uint8_t*)0x20000289 = 0x80);
  NONFAILING(memset((void*)0x2000028a, 0, 12));
  NONFAILING(*(uint8_t*)0x20000296 = 0);
  NONFAILING(*(uint8_t*)0x20000297 = 0xbb);
  NONFAILING(*(uint32_t*)0x20000298 = 7);
  syscall(SYS_sendto, /*fd=*/r[0], /*buf=*/0x20000100ul, /*len=*/0xffffff1aul,
          /*f=MSG_EOF*/ 0x100ul, /*addr=*/0x20000280ul, /*addrlen=*/0x1cul);
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  loop();
  return 0;
}