// https://syzkaller.appspot.com/bug?id=6dcd14a729df98f989c7b76d254226ae67084efd
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    NONFAILING(strncpy(buf, (char*)a0, sizeof(buf)));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

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 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);
        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;
      }
    }
  }
}

#ifndef __NR_writev
#define __NR_writev 146
#endif
#ifndef __NR_readv
#define __NR_readv 145
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[1];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20005000, "/dev/sg#", 9));
    r[0] = syz_open_dev(0x20005000, 0, 0x8002);
    break;
  case 2:
    NONFAILING(*(uint32_t*)0x201b6f90 = 0x20e43000);
    NONFAILING(*(uint32_t*)0x201b6f94 = 0x6e);
    NONFAILING(memcpy((void*)0x20e43000,
                      "\xe5\x9b\xc0\x53\xdc\xe4\x04\x31\x7b\xb5\x1f\x59\x7e\xa6"
                      "\xfe\xb2\x7c\x63\x71\x10\x0c\xa6\xf5\xc5\x3d\xed\x1c\x2f"
                      "\x0f\xd1\xc9\x2c\x1f\x80\x82\xc2\x12\xf7\xfe\xad\xb3\xaf"
                      "\xbb\x07\x69\x4a\x7a\x99\x03\x07\x95\x98\xae\x4e\xf5\xd5"
                      "\x9f\x23\x0f\xb5\x50\x1c\xc9\x70\xe2\x62\x4d\xb6\x29\x27"
                      "\x59\xf2\x04\xd3\x0c\xf0\xd6\x34\x6d\x8e\xa5\xde\x77\x3c"
                      "\x25\x57\xd5\xaa\x36\x7d\x15\x8c\x63\xff\x08\x00\x00\x00"
                      "\x00\x00\x00\x00\x5d\xb2\x19\x9c\xc8\xf0\x1e\x33",
                      110));
    syscall(__NR_writev, r[0], 0x201b6f90, 1);
    break;
  case 3:
    NONFAILING(*(uint32_t*)0x20544f60 = 0x20fe3000);
    NONFAILING(*(uint32_t*)0x20544f64 = 0);
    NONFAILING(*(uint32_t*)0x20544f68 = 0x20f11000);
    NONFAILING(*(uint32_t*)0x20544f6c = 0);
    NONFAILING(*(uint32_t*)0x20544f70 = 0x2047a000);
    NONFAILING(*(uint32_t*)0x20544f74 = 0);
    NONFAILING(*(uint32_t*)0x20544f78 = 0x20cca000);
    NONFAILING(*(uint32_t*)0x20544f7c = 0);
    NONFAILING(*(uint32_t*)0x20544f80 = 0x20897fa1);
    NONFAILING(*(uint32_t*)0x20544f84 = 0);
    NONFAILING(*(uint32_t*)0x20544f88 = 0x20c86f42);
    NONFAILING(*(uint32_t*)0x20544f8c = 0);
    NONFAILING(*(uint32_t*)0x20544f90 = 0x20b35000);
    NONFAILING(*(uint32_t*)0x20544f94 = 0);
    NONFAILING(*(uint32_t*)0x20544f98 = 0x208df000);
    NONFAILING(*(uint32_t*)0x20544f9c = 0xe6);
    NONFAILING(*(uint32_t*)0x20544fa0 = 0x203c0f2a);
    NONFAILING(*(uint32_t*)0x20544fa4 = 0);
    NONFAILING(*(uint32_t*)0x20544fa8 = 0x2019bf58);
    NONFAILING(*(uint32_t*)0x20544fac = 0);
    syscall(__NR_readv, r[0], 0x20544f60, 0xa);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(4);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}