// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.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 <sys/wait.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 bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static void setup_sysctl()
{
  int cad_pid = fork();
  if (cad_pid < 0)
    exit(1);
  if (cad_pid == 0) {
    for (;;)
      sleep(100);
  }
  char tmppid[32];
  snprintf(tmppid, sizeof(tmppid), "%d", cad_pid);
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", tmppid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data)) {
    }
  }
  kill(cad_pid, SIGKILL);
  while (waitpid(cad_pid, NULL, 0) != cad_pid)
    ;
}

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 < 4; 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);
      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:
    //  bpf$MAP_CREATE arguments: [
    //    cmd: const = 0x0 (8 bytes)
    //    arg: ptr[in, bpf_map_create_arg] {
    //      union bpf_map_create_arg {
    //        base: bpf_map_create_arg_t[flags[bpf_map_type, int32], int32,
    //        int32, int32, flags[map_flags, int32], const[0, int64]] {
    //          type: bpf_map_type = 0xf (4 bytes)
    //          ksize: int32 = 0x4 (4 bytes)
    //          vsize: int32 = 0x4 (4 bytes)
    //          max: int32 = 0x22 (4 bytes)
    //          flags: map_flags = 0x0 (4 bytes)
    //          inner: fd_bpf_map (resource)
    //          node: int32 = 0x0 (4 bytes)
    //          map_name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    //          00} (length 0x10) map_ifindex: ifindex (resource) btf_fd: fd_btf
    //          (resource) btf_key_type_id: int32 = 0x0 (4 bytes)
    //          btf_value_type_id: int32 = 0x0 (4 bytes)
    //          btf_vmlinux_type_id: int32 = 0x0 (4 bytes)
    //          map_extra: const = 0x0 (8 bytes)
    //          value_type_btf_obj_fd: union
    //          _bpf_map_create_arg_t[flags[bpf_map_type, int32], int32, int32,
    //          int32, flags[map_flags, int32], const[0,
    //          int64]]_value_type_btf_obj_fd_wrapper {
    //            void: buffer: {} (length 0x0)
    //          }
    //          pad1: union _bpf_map_create_arg_t[flags[bpf_map_type, int32],
    //          int32, int32, int32, flags[map_flags, int32], const[0,
    //          int64]]_pad1_wrapper {
    //            value: const = 0x0 (4 bytes)
    //          }
    //          map_token_fd: union _bpf_map_create_arg_t[flags[bpf_map_type,
    //          int32], int32, int32, int32, flags[map_flags, int32], const[0,
    //          int64]]_map_token_fd_wrapper {
    //            void: buffer: {} (length 0x0)
    //          }
    //          pad2: union _bpf_map_create_arg_t[flags[bpf_map_type, int32],
    //          int32, int32, int32, flags[map_flags, int32], const[0,
    //          int64]]_pad2_wrapper {
    //            value: const = 0x0 (4 bytes)
    //          }
    //        }
    //      }
    //    }
    //    size: len = 0x50 (8 bytes)
    //  ]
    //  returns fd_bpf_map
    *(uint32_t*)0x200000000400 = 0xf;
    *(uint32_t*)0x200000000404 = 4;
    *(uint32_t*)0x200000000408 = 4;
    *(uint32_t*)0x20000000040c = 0x22;
    *(uint32_t*)0x200000000410 = 0;
    *(uint32_t*)0x200000000414 = -1;
    *(uint32_t*)0x200000000418 = 0;
    memset((void*)0x20000000041c, 0, 16);
    *(uint32_t*)0x20000000042c = 0;
    *(uint32_t*)0x200000000430 = -1;
    *(uint32_t*)0x200000000434 = 0;
    *(uint32_t*)0x200000000438 = 0;
    *(uint32_t*)0x20000000043c = 0;
    *(uint64_t*)0x200000000440 = 0;
    *(uint32_t*)0x200000000448 = 0;
    *(uint32_t*)0x20000000044c = 0;
    res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200000000400ul,
                  /*size=*/0x50ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  socket$inet arguments: [
    //    domain: const = 0x2 (8 bytes)
    //    type: socket_type = 0x2 (8 bytes)
    //    proto: int32 = 0x0 (4 bytes)
    //  ]
    //  returns sock_in
    res = syscall(__NR_socket, /*domain=*/2ul, /*type=SOCK_DGRAM*/ 2ul,
                  /*proto=*/0);
    if (res != -1)
      r[1] = res;
    break;
  case 2:
    //  bpf$MAP_UPDATE_ELEM arguments: [
    //    cmd: const = 0x2 (8 bytes)
    //    arg: ptr[in, bpf_map_update_arg] {
    //      bpf_map_update_arg {
    //        map: fd_bpf_map (resource)
    //        pad = 0x0 (4 bytes)
    //        key: ptr[in, buffer] {
    //          buffer: {} (length 0x0)
    //        }
    //        val: ptr[in, bpf_map_update_val] {
    //          union bpf_map_update_val {
    //            udp: sock_udp (resource)
    //          }
    //        }
    //        flags: bpf_map_flags = 0x0 (8 bytes)
    //      }
    //    }
    //    size: len = 0x20 (8 bytes)
    //  ]
    *(uint32_t*)0x200000000500 = r[0];
    *(uint64_t*)0x200000000508 = 0x2000000001c0;
    *(uint64_t*)0x200000000510 = 0x2000000004c0;
    *(uint32_t*)0x2000000004c0 = r[1];
    *(uint64_t*)0x200000000518 = 0;
    syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x200000000500ul, /*size=*/0x20ul);
    break;
  case 3:
    //  ioctl$EXT4_IOC_CLEAR_ES_CACHE arguments: [
    //    fd: fd (resource)
    //    cmd: const = 0x8905 (4 bytes)
    //  ]
    syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x8905, 0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  setup_sysctl();
  const char* reason;
  (void)reason;
  loop();
  return 0;
}