// https://syzkaller.appspot.com/bug?id=edd352dca9f17e84e56cd73218fadc6359dd1040
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <string.h>

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  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);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  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(...)                                                        \
  {                                                                            \
    __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 test();

void loop()
{
  while (1) {
    test();
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x20000180, "/dev/infiniband/rdma_cm", 24));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000180, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(*(uint32_t*)0x200000c0 = 0);
    NONFAILING(*(uint16_t*)0x200000c4 = 0x18);
    NONFAILING(*(uint16_t*)0x200000c6 = 0xfa00);
    NONFAILING(*(uint64_t*)0x200000c8 = 3);
    NONFAILING(*(uint64_t*)0x200000d0 = 0x20000080);
    NONFAILING(*(uint16_t*)0x200000d8 = 2);
    NONFAILING(*(uint8_t*)0x200000da = 0);
    NONFAILING(*(uint8_t*)0x200000db = 0);
    NONFAILING(*(uint8_t*)0x200000dc = 0);
    NONFAILING(*(uint8_t*)0x200000dd = 0);
    NONFAILING(*(uint8_t*)0x200000de = 0);
    NONFAILING(*(uint8_t*)0x200000df = 0);
    res = syscall(__NR_write, r[0], 0x200000c0, 0x20);
    if (res != -1)
      NONFAILING(r[1] = *(uint32_t*)0x20000080);
    break;
  case 2:
    NONFAILING(*(uint32_t*)0x20000440 = 9);
    NONFAILING(*(uint16_t*)0x20000444 = 0x108);
    NONFAILING(*(uint16_t*)0x20000446 = 0xfa00);
    NONFAILING(*(uint32_t*)0x20000448 = r[1]);
    NONFAILING(*(uint8_t*)0x2000044c = 0x77);
    NONFAILING(memcpy((void*)0x2000044d, "\xaf\x7c\x99", 3));
    NONFAILING(memcpy(
        (void*)0x20000450,
        "\x86\x46\x86\x93\xe3\x0a\x76\x5d\xf6\x23\x39\x73\xfa\x01\x38\x6e\xa8"
        "\xbf\xf2\xcf\xbb\xe5\xe3\x38\x1b\x8c\x0f\xd8\x26\x74\x9d\xe0\x13\x2a"
        "\xbf\xff\x4e\xdc\xb7\x3b\xf4\x36\x6e\x77\x02\x31\x5b\xa2\x9d\x8f\x35"
        "\x67\xf1\x5f\x61\x3c\xe6\x67\x39\xf7\xeb\x62\x46\x63\xed\x20\x1e\xd5"
        "\x80\x41\xc5\xd5\xf8\x76\x8c\x59\x0e\x59\x88\xac\x89\x7b\xea\xb8\xf1"
        "\xf2\xc1\x1f\xd8\x48\xf3\x86\x4a\xdd\x1c\x7b\xc9\x12\x9e\x9a\xba\xc4"
        "\x3d\x27\x1c\x98\x04\x73\x0e\xbb\xf0\xad\xca\xa5\x5a\x5a\x31\x16\x0c"
        "\x78\xc1\x5b\xfe\x68\x9f\xa9\xcd\xa5\x66\x54\xff\x81\xbe\x0b\x54\x98"
        "\xcd\xe6\xac\xcf\x4a\xdb\x65\xbd\x06\x88\x2b\xc6\x66\xe8\x71\x5e\xa1"
        "\x0d\x2e\xdc\xe6\x03\xbe\xa7\xa3\x56\xb9\x90\x23\x05\x5a\xe6\xc6\x43"
        "\xd9\x85\xb2\x6a\xa9\x15\x1d\x5f\x79\x50\x38\x2e\xd8\xf1\x03\xa8\x94"
        "\xcc\x39\xbc\x5a\x70\xff\x6a\x9c\xf6\x05\x06\x0e\x17\x67\x35\x43\x76"
        "\xc0\x2d\xfc\xa8\x59\x65\x2a\xae\x7a\x2b\x2d\xfa\x9e\x55\xab\xf2\x7f"
        "\x5b\xd7\x4f\x80\xf9\xe3\x66\x32\xe8\x7e\x00\xd1\x49\x04\x96\x59\x12"
        "\x94\xa9\x9c\x59\x6a\x57\x27\x7b\x58\x99\x11\x4e\x9a\x16\x23\xa1\xfc"
        "\x3e",
        256));
    syscall(__NR_write, r[0], 0x20000440, 0x110);
    break;
  case 3:
    syscall(__NR_close, r[0]);
    break;
  }
}

void test()
{
  execute(4);
  collide = 1;
  execute(4);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (;;) {
    loop();
  }
}