// https://syzkaller.appspot.com/bug?id=892ad90d74b324e4b35fa23c4ac6602b76b59573
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

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 thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 6; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50 + (call == 4 ? 500 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

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

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    *(uint32_t*)0x20000840 = 0xb;
    *(uint32_t*)0x20000844 = 5;
    *(uint32_t*)0x20000848 = 2;
    *(uint32_t*)0x2000084c = 1;
    *(uint32_t*)0x20000850 = 5;
    *(uint32_t*)0x20000854 = -1;
    *(uint32_t*)0x20000858 = 0;
    memset((void*)0x2000085c, 0, 16);
    *(uint32_t*)0x2000086c = 0;
    *(uint32_t*)0x20000870 = -1;
    *(uint32_t*)0x20000874 = 0;
    *(uint32_t*)0x20000878 = 0;
    *(uint32_t*)0x2000087c = 0;
    *(uint64_t*)0x20000880 = 0;
    res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x20000840ul, /*size=*/0x48ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x20000180 = 0;
    *(uint32_t*)0x20000184 = 0xc;
    *(uint64_t*)0x20000188 = 0x20000440;
    memcpy((void*)0x20000440,
           "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x18\x11\x00\x00",
           20);
    *(uint32_t*)0x20000454 = r[0];
    memcpy(
        (void*)0x20000458,
        "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x08\x00\x00\x08\x00\x00\x00\x7b"
        "\x8a\xf8\xff\x00\x00\x00\x00\xbf\xa2\x00\x00\x00\x00\x00\x00\x07\x02"
        "\x00\x00\xf8\xff\xff\xff\xb7\x03\x00\x00\x08\x00\x00\x00\xb7\x04\x00"
        "\x00\x00\x00\x00\x00\x85\x00\x00\x00\x03\x00\x00\x00\x95",
        65);
    *(uint64_t*)0x20000190 = 0;
    *(uint32_t*)0x20000198 = 0;
    *(uint32_t*)0x2000019c = 0;
    *(uint64_t*)0x200001a0 = 0;
    *(uint32_t*)0x200001a8 = 0;
    *(uint32_t*)0x200001ac = 0;
    memset((void*)0x200001b0, 0, 16);
    *(uint32_t*)0x200001c0 = 0;
    *(uint32_t*)0x200001c4 = 0;
    *(uint32_t*)0x200001c8 = -1;
    *(uint32_t*)0x200001cc = 0;
    *(uint64_t*)0x200001d0 = 0;
    *(uint32_t*)0x200001d8 = 0;
    *(uint32_t*)0x200001dc = 0;
    *(uint64_t*)0x200001e0 = 0;
    *(uint32_t*)0x200001e8 = 0;
    *(uint32_t*)0x200001ec = 0;
    *(uint32_t*)0x200001f0 = 0;
    *(uint32_t*)0x200001f4 = 0;
    *(uint64_t*)0x200001f8 = 0;
    *(uint64_t*)0x20000200 = 0;
    *(uint32_t*)0x20000208 = 0;
    *(uint32_t*)0x2000020c = 0;
    syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000180ul, /*size=*/0x90ul);
    break;
  case 2:
    *(uint32_t*)0x20000580 = r[0];
    *(uint64_t*)0x20000588 = 0x20000300;
    *(uint32_t*)0x20000300 = 0;
    *(uint64_t*)0x20000590 = 0x20000540;
    memcpy((void*)0x20000540, "%+9llu \000", 8);
    *(uint64_t*)0x20000598 = 0;
    syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x20000580ul, /*size=*/0x20ul);
    break;
  case 3:
    *(uint32_t*)0x200007c0 = 0x11;
    *(uint32_t*)0x200007c4 = 0xc;
    *(uint64_t*)0x200007c8 = 0x20000440;
    *(uint64_t*)0x200007d0 = 0x20000880;
    memcpy((void*)0x20000880, "GPL\000", 4);
    *(uint32_t*)0x200007d8 = 0;
    *(uint32_t*)0x200007dc = 0;
    *(uint64_t*)0x200007e0 = 0;
    *(uint32_t*)0x200007e8 = 0;
    *(uint32_t*)0x200007ec = 0;
    memset((void*)0x200007f0, 0, 16);
    *(uint32_t*)0x20000800 = 0;
    *(uint32_t*)0x20000804 = 0;
    *(uint32_t*)0x20000808 = -1;
    *(uint32_t*)0x2000080c = 0;
    *(uint64_t*)0x20000810 = 0;
    *(uint32_t*)0x20000818 = 0;
    *(uint32_t*)0x2000081c = 0;
    *(uint64_t*)0x20000820 = 0;
    *(uint32_t*)0x20000828 = 0;
    *(uint32_t*)0x2000082c = 0;
    *(uint32_t*)0x20000830 = 0;
    *(uint32_t*)0x20000834 = 0;
    *(uint64_t*)0x20000838 = 0;
    *(uint64_t*)0x20000840 = 0;
    *(uint32_t*)0x20000848 = 0;
    *(uint32_t*)0x2000084c = 0;
    res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200007c0ul, /*size=*/0x90ul);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    *(uint64_t*)0x200001c0 = 0x20000080;
    memcpy((void*)0x20000080, "kfree\000", 6);
    *(uint32_t*)0x200001c8 = r[1];
    syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200001c0ul, /*size=*/0x10ul);
    break;
  case 5:
    *(uint32_t*)0x20000680 = 3;
    *(uint32_t*)0x20000684 = 3;
    *(uint64_t*)0x20000688 = 0x20000740;
    *(uint64_t*)0x20000690 = 0x20000780;
    memcpy((void*)0x20000780, "GPL\000", 4);
    *(uint32_t*)0x20000698 = 0;
    *(uint32_t*)0x2000069c = 0;
    *(uint64_t*)0x200006a0 = 0;
    *(uint32_t*)0x200006a8 = 0;
    *(uint32_t*)0x200006ac = 0;
    memset((void*)0x200006b0, 0, 16);
    *(uint32_t*)0x200006c0 = 0;
    *(uint32_t*)0x200006c4 = 0;
    *(uint32_t*)0x200006c8 = 0;
    *(uint32_t*)0x200006cc = 0;
    *(uint64_t*)0x200006d0 = 0;
    *(uint32_t*)0x200006d8 = 0;
    *(uint32_t*)0x200006dc = 0;
    *(uint64_t*)0x200006e0 = 0;
    *(uint32_t*)0x200006e8 = 0;
    *(uint32_t*)0x200006ec = 0;
    *(uint32_t*)0x200006f0 = 0;
    *(uint32_t*)0x200006f4 = 0;
    *(uint64_t*)0x200006f8 = 0;
    *(uint64_t*)0x20000700 = 0;
    *(uint32_t*)0x20000708 = 0;
    *(uint32_t*)0x2000070c = 0;
    syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x20000680ul, /*size=*/0x90ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}