// https://syzkaller.appspot.com/bug?id=983100feb84ba7a9a7c6b9c62919349ca20b4a05
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#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/mount.h>
#include <sys/prctl.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
#ifndef __NR_close_range
#define __NR_close_range 436
#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 kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

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 execute_one(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 10; 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);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  creat arguments: [
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x2000000002c0, "./file0\000", 8);
    res = syscall(__NR_creat, /*file=*/0x2000000002c0ul, /*mode=*/0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  open$dir arguments: [
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    flags: open_flags = 0x0 (8 bytes)
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    //  returns fd_dir
    memcpy((void*)0x200000000080, "./file0\000", 8);
    res = syscall(__NR_open, /*file=*/0x200000000080ul, /*flags=*/0ul,
                  /*mode=*/0ul);
    if (res != -1)
      r[1] = res;
    break;
  case 2:
    //  mmap$xdp arguments: [
    //    addr: VMA[0x4000]
    //    len: len = 0x4000 (4 bytes)
    //    prot: mmap_prot = 0x0 (8 bytes)
    //    flags: mmap_flags = 0x12 (8 bytes)
    //    fd: sock_xdp (resource)
    //    offset: xdp_mmap_offsets = 0x0 (8 bytes)
    //  ]
    syscall(__NR_mmap, /*addr=*/0x200000ffc000ul, /*len=*/0x4000, /*prot=*/0ul,
            /*flags=MAP_FIXED|MAP_PRIVATE*/ 0x12ul, /*fd=*/r[1],
            /*offset=*/0ul);
    break;
  case 3:
    //  close_range arguments: [
    //    fd: fd (resource)
    //    max_fd: fd (resource)
    //    flags: close_range_flags = 0x2 (8 bytes)
    //  ]
    syscall(__NR_close_range, /*fd=*/r[1], /*max_fd=*/r[1],
            /*flags=CLOSE_RANGE_UNSHARE*/ 2ul);
    break;
  case 4:
    //  writev arguments: [
    //    fd: fd (resource)
    //    vec: ptr[in, array[iovec[in, array[int8]]]] {
    //      array[iovec[in, array[int8]]] {
    //        iovec[in, array[int8]] {
    //          addr: ptr[in, buffer] {
    //            buffer: {a1} (length 0x1)
    //          }
    //          len: len = 0x1 (8 bytes)
    //        }
    //      }
    //    }
    //    vlen: len = 0x1 (8 bytes)
    //  ]
    *(uint64_t*)0x200000000100 = 0x200000000180;
    memset((void*)0x200000000180, 161, 1);
    *(uint64_t*)0x200000000108 = 1;
    syscall(__NR_writev, /*fd=*/r[0], /*vec=*/0x200000000100ul, /*vlen=*/1ul);
    break;
  case 5:
    //  bpf$PROG_LOAD arguments: [
    //    cmd: const = 0x5 (8 bytes)
    //    arg: ptr[in, bpf_prog_t[flags[bpf_prog_type, int32],
    //    bpf_prog_attach_types, bpf_btf_id[opt], fd_bpf_prog[opt]]] {
    //      bpf_prog_t[flags[bpf_prog_type, int32], bpf_prog_attach_types,
    //      bpf_btf_id[opt], fd_bpf_prog[opt]] {
    //        type: bpf_prog_type = 0x2 (4 bytes)
    //        ninsn: bytesize8 = 0x4 (4 bytes)
    //        insns: ptr[inout, array[ANYUNION]] {
    //          array[ANYUNION] {
    //            union ANYUNION {
    //              ANYBLOB: buffer: {18 00 00 00 03 00 00 00 00 00 00 00 fe 02
    //              00 10 85 00 00 00 07 00 00 00 95} (length 0x19)
    //            }
    //          }
    //        }
    //        license: ptr[in, buffer] {
    //          buffer: {47 50 4c 00} (length 0x4)
    //        }
    //        loglev: int32 = 0x0 (4 bytes)
    //        logsize: len = 0x0 (4 bytes)
    //        log: nil
    //        kern_version: bpf_kern_version = 0x41000 (4 bytes)
    //        flags: bpf_prog_load_flags = 0x74 (4 bytes)
    //        prog_name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    //        00} (length 0x10) prog_ifindex: ifindex (resource)
    //        expected_attach_type: union bpf_prog_attach_types {
    //          fallback: bpf_attach_types = 0x30 (4 bytes)
    //        }
    //        btf_fd: fd_btf (resource)
    //        func_info_rec_size: const = 0x0 (4 bytes)
    //        func_info: nil
    //        func_info_cnt: len = 0x0 (4 bytes)
    //        line_info_rec_size: const = 0x0 (4 bytes)
    //        line_info: nil
    //        line_info_cnt: len = 0x0 (4 bytes)
    //        attach_btf_id: bpf_btf_id (resource)
    //        attach_prog_fd: fd_bpf_prog (resource)
    //        core_relo_cnt: len = 0x0 (4 bytes)
    //        fd_array: nil
    //        core_relos: nil
    //        core_relo_rec_size: const = 0x0 (4 bytes)
    //        log_true_size: int32 = 0x0 (4 bytes)
    //        prog_token_fd: union _bpf_prog_t[flags[bpf_prog_type, int32],
    //        bpf_prog_attach_types, bpf_btf_id[opt],
    //        fd_bpf_prog[opt]]_prog_token_fd_wrapper {
    //          void: buffer: {} (length 0x0)
    //        }
    //        pad: union _bpf_prog_t[flags[bpf_prog_type, int32],
    //        bpf_prog_attach_types, bpf_btf_id[opt],
    //        fd_bpf_prog[opt]]_pad_wrapper {
    //          value: const = 0x0 (4 bytes)
    //        }
    //      }
    //    }
    //    size: len = 0x94 (8 bytes)
    //  ]
    //  returns fd_bpf_prog
    *(uint32_t*)0x200000000600 = 2;
    *(uint32_t*)0x200000000604 = 4;
    *(uint64_t*)0x200000000608 = 0x200000000200;
    memcpy((void*)0x200000000200,
           "\x18\x00\x00\x00\x03\x00\x00\x00\x00\x00\x00\x00\xfe\x02\x00\x10"
           "\x85\x00\x00\x00\x07\x00\x00\x00\x95",
           25);
    *(uint64_t*)0x200000000610 = 0x200000000000;
    memcpy((void*)0x200000000000, "GPL\000", 4);
    *(uint32_t*)0x200000000618 = 0;
    *(uint32_t*)0x20000000061c = 0;
    *(uint64_t*)0x200000000620 = 0;
    *(uint32_t*)0x200000000628 = 0x41000;
    *(uint32_t*)0x20000000062c = 0x74;
    memset((void*)0x200000000630, 0, 16);
    *(uint32_t*)0x200000000640 = 0;
    *(uint32_t*)0x200000000644 = 0x30;
    *(uint32_t*)0x200000000648 = 0;
    *(uint32_t*)0x20000000064c = 0;
    *(uint64_t*)0x200000000650 = 0;
    *(uint32_t*)0x200000000658 = 0;
    *(uint32_t*)0x20000000065c = 0;
    *(uint64_t*)0x200000000660 = 0;
    *(uint32_t*)0x200000000668 = 0;
    *(uint32_t*)0x20000000066c = 0;
    *(uint32_t*)0x200000000670 = 0;
    *(uint32_t*)0x200000000674 = 0;
    *(uint64_t*)0x200000000678 = 0;
    *(uint64_t*)0x200000000680 = 0;
    *(uint32_t*)0x200000000688 = 0;
    *(uint32_t*)0x20000000068c = 0;
    *(uint32_t*)0x200000000690 = 0;
    res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000600ul,
                  /*size=*/0x94ul);
    if (res != -1)
      r[2] = res;
    break;
  case 6:
    //  write$char_usb arguments: [
    //    fd: fd_char_usb (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {64 e9} (length 0x2)
    //    }
    //    count: len = 0x2 (8 bytes)
    //  ]
    memcpy((void*)0x2000000001c0, "\x64\xe9", 2);
    syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x2000000001c0ul, /*count=*/2ul);
    break;
  case 7:
    //  bpf$BPF_LINK_CREATE_XDP arguments: [
    //    cmd: const = 0x1c (8 bytes)
    //    arg: ptr[in, bpf_link_create_arg_t[fd_bpf_prog_xdp, ifindex,
    //    const[BPF_XDP, int32], flags[xdp_flags, int32]]] {
    //      bpf_link_create_arg_t[fd_bpf_prog_xdp, ifindex, const[BPF_XDP,
    //      int32], flags[xdp_flags, int32]] {
    //        prog_fd: fd_bpf_prog_xdp (resource)
    //        target_fd: ifindex (resource)
    //        attach_type: const = 0x30 (4 bytes)
    //        flags: xdp_flags = 0x0 (4 bytes)
    //        extra: union optional[link_create_arg_extra] {
    //          val: union link_create_arg_extra {
    //            uprobe_multi: link_create_uprobe_multi {
    //              path: ptr[in, buffer] {
    //                buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //              }
    //              offsets: ptr[in, array[int64]] {
    //                array[int64] {
    //                  int64 = 0x2 (8 bytes)
    //                }
    //              }
    //              ref_ctr_offsets: nil
    //              cookies: int64 = 0x0 (8 bytes)
    //              cnt: len = 0x1 (4 bytes)
    //              flags: bpf_link_create_uprobe_multi_flags = 0x0 (4 bytes)
    //              pid: pid (resource)
    //              pad = 0x0 (4 bytes)
    //            }
    //          }
    //        }
    //      }
    //    }
    //    size: len = 0x40 (8 bytes)
    //  ]
    //  returns fd_bpf_link
    *(uint32_t*)0x2000000005c0 = r[2];
    *(uint32_t*)0x2000000005c4 = 0;
    *(uint32_t*)0x2000000005c8 = 0x30;
    *(uint32_t*)0x2000000005cc = 0;
    *(uint64_t*)0x2000000005d0 = 0x200000000140;
    memcpy((void*)0x200000000140, "./file0\000", 8);
    *(uint64_t*)0x2000000005d8 = 0x200000000740;
    *(uint64_t*)0x200000000740 = 2;
    *(uint64_t*)0x2000000005e0 = 0;
    *(uint64_t*)0x2000000005e8 = 0;
    *(uint32_t*)0x2000000005f0 = 1;
    *(uint32_t*)0x2000000005f4 = 0;
    *(uint32_t*)0x2000000005f8 = 0;
    syscall(__NR_bpf, /*cmd=*/0x1cul, /*arg=*/0x2000000005c0ul,
            /*size=*/0x40ul);
    break;
  case 8:
    //  creat arguments: [
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    //  returns fd
    memcpy((void*)0x200000000280, "./file0\000", 8);
    res = syscall(__NR_creat, /*file=*/0x200000000280ul, /*mode=*/0ul);
    if (res != -1)
      r[3] = res;
    break;
  case 9:
    //  write$char_usb arguments: [
    //    fd: fd_char_usb (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {ce 56 e8} (length 0x3)
    //    }
    //    count: len = 0x3 (8 bytes)
    //  ]
    memcpy((void*)0x200000000f80, "\xce\x56\xe8", 3);
    syscall(__NR_write, /*fd=*/r[3], /*buf=*/0x200000000f80ul, /*count=*/3ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*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=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}