// https://syzkaller.appspot.com/bug?id=91f4244afb85b396b4cb94ba4b36a859c5e3ce80
// 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/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

static unsigned long long procid;

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;
}

const int kInitNetNsFd = 201;

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;
}

static long syz_init_net_socket(volatile long domain, volatile long type,
                                volatile long proto)
{
  return syscall(__NR_socket, domain, type, proto);
}

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

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  socket$nl_generic arguments: [
    //    domain: const = 0x10 (8 bytes)
    //    type: const = 0x3 (8 bytes)
    //    proto: const = 0x10 (4 bytes)
    //  ]
    //  returns sock_nl_generic
    syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0x10);
    break;
  case 1:
    //  syz_init_net_socket$bt_hci arguments: [
    //    fam: const = 0x1f (8 bytes)
    //    type: const = 0x3 (8 bytes)
    //    proto: const = 0x5 (8 bytes)
    //  ]
    //  returns sock_bt_hci
    syz_init_net_socket(/*fam=*/0x1f, /*type=*/3, /*proto=*/5);
    break;
  case 2:
    //  close arguments: [
    //    fd: fd (resource)
    //  ]
    syscall(__NR_close, /*fd=*/4);
    break;
  case 3:
    //  syz_open_procfs$namespace arguments: [
    //    pid: pid (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {6e 73 2f 63 67 72 6f 75 70 00} (length 0xa)
    //    }
    //  ]
    //  returns fd_namespace
    memcpy((void*)0x200000000040, "ns/cgroup\000", 10);
    syz_open_procfs(/*pid=*/0, /*file=*/0x200000000040);
    break;
  case 4:
    //  bpf$PROG_LOAD_XDP arguments: [
    //    cmd: const = 0x5 (8 bytes)
    //    arg: ptr[in, bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32],
    //    const[BPF_XDP, int32], const[0, int32], const[0, int32]]] {
    //      bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32], const[BPF_XDP, int32],
    //      const[0, int32], const[0, int32]] {
    //        type: const = 0x6 (4 bytes)
    //        ninsn: bytesize8 = 0x3 (4 bytes)
    //        insns: ptr[inout, array[ANYUNION]] {
    //          array[ANYUNION] {
    //          }
    //        }
    //        license: ptr[in, buffer] {
    //          buffer: {47 50 4c 00} (length 0x4)
    //        }
    //        loglev: int32 = 0x0 (4 bytes)
    //        logsize: len = 0xff46 (4 bytes)
    //        log: nil
    //        kern_version: bpf_kern_version = 0x0 (4 bytes)
    //        flags: bpf_prog_load_flags = 0x0 (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: const = 0x25 (4 bytes)
    //        btf_fd: fd_btf (resource)
    //        func_info_rec_size: const = 0x8 (4 bytes)
    //        func_info: nil
    //        func_info_cnt: len = 0xfffffffffffffe79 (4 bytes)
    //        line_info_rec_size: const = 0x10 (4 bytes)
    //        line_info: nil
    //        line_info_cnt: len = 0x0 (4 bytes)
    //        attach_btf_id: const = 0x0 (4 bytes)
    //        attach_prog_fd: const = 0x0 (4 bytes)
    //        core_relo_cnt: len = 0x0 (4 bytes)
    //        fd_array: nil
    //        core_relos: nil
    //        core_relo_rec_size: const = 0x10 (4 bytes)
    //        log_true_size: int32 = 0x0 (4 bytes)
    //        prog_token_fd: union _bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32],
    //        const[BPF_XDP, int32], const[0, int32], const[0,
    //        int32]]_prog_token_fd_wrapper {
    //          void: buffer: {} (length 0x0)
    //        }
    //        pad: union _bpf_prog_t[const[BPF_PROG_TYPE_XDP, int32],
    //        const[BPF_XDP, int32], const[0, int32], const[0,
    //        int32]]_pad_wrapper {
    //          value: const = 0x0 (4 bytes)
    //        }
    //      }
    //    }
    //    size: len = 0x94 (8 bytes)
    //  ]
    //  returns fd_bpf_prog_xdp
    *(uint32_t*)0x200000000480 = 6;
    *(uint32_t*)0x200000000484 = 3;
    *(uint64_t*)0x200000000488 = 0x200000000680;
    *(uint64_t*)0x200000000490 = 0x2000000002c0;
    memcpy((void*)0x2000000002c0, "GPL\000", 4);
    *(uint32_t*)0x200000000498 = 0;
    *(uint32_t*)0x20000000049c = 0xff46;
    *(uint64_t*)0x2000000004a0 = 0;
    *(uint32_t*)0x2000000004a8 = 0;
    *(uint32_t*)0x2000000004ac = 0;
    memset((void*)0x2000000004b0, 0, 16);
    *(uint32_t*)0x2000000004c0 = 0;
    *(uint32_t*)0x2000000004c4 = 0x25;
    *(uint32_t*)0x2000000004c8 = -1;
    *(uint32_t*)0x2000000004cc = 8;
    *(uint64_t*)0x2000000004d0 = 0;
    *(uint32_t*)0x2000000004d8 = 0xfffffe79;
    *(uint32_t*)0x2000000004dc = 0x10;
    *(uint64_t*)0x2000000004e0 = 0;
    *(uint32_t*)0x2000000004e8 = 0;
    *(uint32_t*)0x2000000004ec = 0;
    *(uint32_t*)0x2000000004f0 = 0;
    *(uint32_t*)0x2000000004f4 = 0;
    *(uint64_t*)0x2000000004f8 = 0;
    *(uint64_t*)0x200000000500 = 0;
    *(uint32_t*)0x200000000508 = 0x10;
    *(uint32_t*)0x20000000050c = 0;
    *(uint32_t*)0x200000000510 = 0;
    res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000480ul,
                  /*size=*/0x94ul);
    if (res != -1)
      r[0] = res;
    break;
  case 5:
    //  bpf$BPF_PROG_TEST_RUN arguments: [
    //    cmd: const = 0xa (8 bytes)
    //    arg: ptr[in, bpf_test_prog_arg] {
    //      bpf_test_prog_arg {
    //        prog: fd_bpf_prog (resource)
    //        retval: const = 0x5 (4 bytes)
    //        insizedata: len = 0x0 (4 bytes)
    //        outsizedata: len = 0x0 (4 bytes)
    //        indata: nil
    //        outdata: nil
    //        repeat: int32 = 0xd01 (4 bytes)
    //        dur: const = 0x2a0 (4 bytes)
    //        insizectx: len = 0x0 (4 bytes)
    //        outsizectx: len = 0x0 (4 bytes)
    //        inctx: nil
    //        outctx: nil
    //        flags: bpf_prog_test_run_flags = 0x2 (4 bytes)
    //        cpu: const = 0x0 (4 bytes)
    //        batch_size: int32 = 0x0 (4 bytes)
    //        pad = 0x0 (4 bytes)
    //      }
    //    }
    //    size: len = 0x50 (8 bytes)
    //  ]
    *(uint32_t*)0x200000000600 = r[0];
    *(uint32_t*)0x200000000604 = 5;
    *(uint32_t*)0x200000000608 = 0;
    *(uint32_t*)0x20000000060c = 0;
    *(uint64_t*)0x200000000610 = 0;
    *(uint64_t*)0x200000000618 = 0;
    *(uint32_t*)0x200000000620 = 0xd01;
    *(uint32_t*)0x200000000624 = 0x2a0;
    *(uint32_t*)0x200000000628 = 0;
    *(uint32_t*)0x20000000062c = 0;
    *(uint64_t*)0x200000000630 = 0;
    *(uint64_t*)0x200000000638 = 0;
    *(uint32_t*)0x200000000640 = 2;
    *(uint32_t*)0x200000000644 = 0;
    *(uint32_t*)0x200000000648 = 0;
    syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x200000000600ul, /*size=*/0x50ul);
    break;
  case 6:
    //  socket$kcm arguments: [
    //    domain: const = 0x29 (8 bytes)
    //    type: kcm_socket_type = 0x0 (8 bytes)
    //    proto: const = 0x0 (4 bytes)
    //  ]
    //  returns sock_kcm
    syscall(__NR_socket, /*domain=*/0x29ul, /*type=*/0ul, /*proto=*/0);
    break;
  case 7:
    //  mmap arguments: [
    //    addr: VMA[0xb36000]
    //    len: len = 0xb36000 (8 bytes)
    //    prot: mmap_prot = 0xb635773f07ebbeef (8 bytes)
    //    flags: mmap_flags = 0x8031 (8 bytes)
    //    fd: fd (resource)
    //    offset: intptr = 0x215eb000 (8 bytes)
    //  ]
    syscall(
        __NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0xb36000ul,
        /*prot=PROT_GROWSUP|PROT_GROWSDOWN|PROT_SEM|PROT_WRITE|PROT_READ|PROT_EXEC|0xb635773f04ebbee0*/
        0xb635773f07ebbeeful,
        /*flags=MAP_POPULATE|MAP_FIXED|MAP_ANONYMOUS|MAP_SHARED*/ 0x8031ul,
        /*fd=*/(intptr_t)-1, /*offset=*/0x215eb000ul);
    break;
  case 8:
    //  socket arguments: [
    //    domain: socket_domain = 0x14 (8 bytes)
    //    type: socket_type = 0x2 (8 bytes)
    //    proto: int32 = 0x0 (4 bytes)
    //  ]
    //  returns sock
    res = syscall(__NR_socket, /*domain=AF_NETLINK|0x4*/ 0x14ul,
                  /*type=SOCK_DGRAM*/ 2ul, /*proto=*/0);
    if (res != -1)
      r[1] = res;
    break;
  case 9:
    //  ioctl$sock_SIOCGIFINDEX arguments: [
    //    fd: sock (resource)
    //    cmd: const = 0x61d0 (4 bytes)
    //    arg: nil
    //  ]
    syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x61d0, /*arg=*/0ul);
    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);
  const char* reason;
  (void)reason;
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}