// https://syzkaller.appspot.com/bug?id=a5ac2b7b6a9b38df4376edd7d2bdaf925e4ef04f
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  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_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  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;                                                                        \
  })

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

int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  install_segv_handler();
  intptr_t res = 0;
  NONFAILING(memcpy((void*)0x20000000, "/proc/self/exe\000", 15));
  res = syscall(__NR_openat, 0xffffff9c, 0x20000000ul, 0ul, 0ul);
  if (res != -1)
    r[0] = res;
  syscall(__NR_mmap, 0x20000000ul, 0x4000ul, 0x800002ul, 0x12ul, r[0],
          0xb4bfd000ul);
  res = syscall(__NR_socketpair, 1ul, 1ul, 0, 0x20004640ul);
  if (res != -1)
    NONFAILING(r[1] = *(uint32_t*)0x20004644);
  NONFAILING(*(uint64_t*)0x20008800 = 0);
  NONFAILING(*(uint32_t*)0x20008808 = 0);
  NONFAILING(*(uint64_t*)0x20008810 = 0x20008780);
  NONFAILING(*(uint64_t*)0x20008780 = 0x20000080);
  NONFAILING(memset((void*)0x20000080, 252, 1));
  NONFAILING(*(uint64_t*)0x20008788 = 0xfffffde9);
  NONFAILING(*(uint64_t*)0x20008818 = 1);
  NONFAILING(*(uint64_t*)0x20008820 = 0);
  NONFAILING(*(uint64_t*)0x20008828 = 0);
  NONFAILING(*(uint32_t*)0x20008830 = 0);
  syscall(__NR_sendmsg, r[1], 0x20008800ul, 0ul);
  return 0;
}