// https://syzkaller.appspot.com/bug?id=90f79672c877b7e8d47dde55acef0c2d0118c27b
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.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;
  }
}

static long syz_open_procfs(volatile long a0, volatile long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

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 < 19; 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 == 3 ? 500 : 0) +
                                     (call == 12 ? 500 : 0) +
                                     (call == 14 ? 500 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    *(uint32_t*)0x20000e40 = 0;
    syscall(__NR_getsockopt, /*fd=*/-1, /*level=*/1, /*optname=*/0x11,
            /*optval=*/0ul, /*optlen=*/0x20000e40ul);
    break;
  case 1:
    memcpy((void*)0x20000080, "cpuset\000", 7);
    res = -1;
    res = syz_open_procfs(/*pid=*/0, /*file=*/0x20000080);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    syscall(__NR_setsockopt, /*fd=*/-1, /*level=*/0x107, /*optname=*/0x12,
            /*optval=*/0ul, /*optlen=*/0ul);
    break;
  case 3:
    syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0ul, /*size=*/0ul);
    break;
  case 4:
    *(uint64_t*)0x20000140 = 8;
    *(uint64_t*)0x20000148 = 0x8b;
    syscall(__NR_prlimit64, /*pid=*/0, /*res=RLIMIT_RTPRIO*/ 0xeul,
            /*new=*/0x20000140ul, /*old=*/0ul);
    break;
  case 5:
    *(uint32_t*)0x20000080 = 7;
    syscall(__NR_sched_setscheduler, /*pid=*/0, /*policy=SCHED_FIFO*/ 1ul,
            /*prio=*/0x20000080ul);
    break;
  case 6:
    syscall(__NR_getpid);
    break;
  case 7:
    syscall(
        __NR_mmap, /*addr=*/0x20000000ul, /*len=*/0xb36000ul,
        /*prot=PROT_GROWSUP|PROT_SEM|PROT_WRITE|PROT_EXEC|0xb635773f04ebbee0*/
        0xb635773f06ebbeeeul,
        /*flags=MAP_POPULATE|MAP_FIXED|MAP_ANONYMOUS|MAP_SHARED*/ 0x8031ul,
        /*fd=*/-1, /*offset=*/0ul);
    break;
  case 8:
    res = syscall(__NR_socketpair, /*domain=*/1ul, /*type=SOCK_DGRAM*/ 2ul,
                  /*proto=*/0, /*fds=*/0x20000200ul);
    if (res != -1) {
      r[1] = *(uint32_t*)0x20000200;
      r[2] = *(uint32_t*)0x20000204;
    }
    break;
  case 9:
    *(uint16_t*)0x2057eff8 = 0;
    *(uint8_t*)0x2057effa = 0;
    *(uint32_t*)0x2057effc = 0;
    syscall(__NR_connect, /*fd=*/r[1], /*addr=*/0x2057eff8ul,
            /*addrlen=*/0x6eul);
    break;
  case 10:
    syscall(__NR_sendmmsg, /*fd=*/r[2], /*mmsg=*/0ul, /*vlen=*/0ul, /*f=*/0ul);
    break;
  case 11:
    syscall(__NR_recvmmsg, /*fd=*/r[1], /*mmsg=*/0x200000c0ul,
            /*vlen=*/0x10106ul, /*f=MSG_PEEK*/ 2ul, /*timeout=*/0ul);
    break;
  case 12:
    *(uint64_t*)0x20000540 = 0;
    *(uint32_t*)0x20000548 = -1;
    syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000540ul, /*size=*/0x10ul);
    break;
  case 13:
    syscall(__NR_splice, /*fdin=*/-1, /*offin=*/0ul, /*fdout=*/-1,
            /*offout=*/0ul, /*len=*/0ul, /*f=*/0ul);
    break;
  case 14:
    syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0ul, /*size=*/0ul);
    break;
  case 15:
    syscall(__NR_socket, /*domain=*/1ul, /*type=SOCK_SEQPACKET*/ 5ul,
            /*proto=*/0);
    break;
  case 16:
    syscall(__NR_mount, /*src=*/0ul, /*dst=*/0ul, /*type=*/0ul, /*flags=*/0ul,
            /*data=*/0ul);
    break;
  case 17:
    syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000000ul,
            /*flags=*/0x200002ul, /*mode=*/0ul);
    break;
  case 18:
    syscall(__NR_read, /*fd=*/r[0], /*buf=*/0x20007100ul, /*len=*/0x941ful);
    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;
}