// WARNING in __put_task_struct (2)
// https://syzkaller.appspot.com/bug?id=e1854417677586ce3d00f498f19816cb4fd15676
// status:fixed
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <sched.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>

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 use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

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);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

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);
}

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_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 200 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  exit(1);
}

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)
{
  int i, call, thread;
  int collide = 0;
again:
  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);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

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

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    memcpy((void*)0x20000380, "/dev/infiniband/rdma_cm", 24);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000380, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x20000280 = 0;
    *(uint16_t*)0x20000284 = 0x18;
    *(uint16_t*)0x20000286 = 0xfa00;
    *(uint64_t*)0x20000288 = 0;
    *(uint64_t*)0x20000290 = 0x20000080;
    *(uint16_t*)0x20000298 = 0x13f;
    *(uint8_t*)0x2000029a = 0;
    *(uint8_t*)0x2000029b = 0;
    *(uint8_t*)0x2000029c = 0;
    *(uint8_t*)0x2000029d = 0;
    *(uint8_t*)0x2000029e = 0;
    *(uint8_t*)0x2000029f = 0;
    res = syscall(__NR_write, r[0], 0x20000280, 0x20);
    if (res != -1)
      r[1] = *(uint32_t*)0x20000080;
    break;
  case 2:
    *(uint32_t*)0x200001c0 = 3;
    *(uint16_t*)0x200001c4 = 0x40;
    *(uint16_t*)0x200001c6 = 0xfa00;
    *(uint16_t*)0x200001c8 = 0xa;
    *(uint16_t*)0x200001ca = htobe16(0x4e23);
    *(uint32_t*)0x200001cc = 0;
    *(uint64_t*)0x200001d0 = htobe64(0);
    *(uint64_t*)0x200001d8 = htobe64(1);
    *(uint32_t*)0x200001e0 = 0;
    *(uint16_t*)0x200001e4 = 0xa;
    *(uint16_t*)0x200001e6 = htobe16(0);
    *(uint32_t*)0x200001e8 = 0;
    *(uint8_t*)0x200001ec = 0xfe;
    *(uint8_t*)0x200001ed = 0x80;
    *(uint8_t*)0x200001ee = 0;
    *(uint8_t*)0x200001ef = 0;
    *(uint8_t*)0x200001f0 = 0;
    *(uint8_t*)0x200001f1 = 0;
    *(uint8_t*)0x200001f2 = 0;
    *(uint8_t*)0x200001f3 = 0;
    *(uint8_t*)0x200001f4 = 0;
    *(uint8_t*)0x200001f5 = 0;
    *(uint8_t*)0x200001f6 = 0;
    *(uint8_t*)0x200001f7 = 0;
    *(uint8_t*)0x200001f8 = 0;
    *(uint8_t*)0x200001f9 = 0;
    *(uint8_t*)0x200001fa = 0;
    *(uint8_t*)0x200001fb = 0;
    *(uint32_t*)0x200001fc = 0;
    *(uint32_t*)0x20000200 = r[1];
    *(uint32_t*)0x20000204 = 0;
    syscall(__NR_write, r[0], 0x200001c0, 0x48);
    break;
  case 3:
    *(uint32_t*)0x20000000 = 3;
    *(uint16_t*)0x20000004 = 0x40;
    *(uint16_t*)0x20000006 = 0xfa00;
    *(uint16_t*)0x20000008 = 0xa;
    *(uint16_t*)0x2000000a = htobe16(0x4e23);
    *(uint32_t*)0x2000000c = 7;
    *(uint8_t*)0x20000010 = 0;
    *(uint8_t*)0x20000011 = 0;
    *(uint8_t*)0x20000012 = 0;
    *(uint8_t*)0x20000013 = 0;
    *(uint8_t*)0x20000014 = 0;
    *(uint8_t*)0x20000015 = 0;
    *(uint8_t*)0x20000016 = 0;
    *(uint8_t*)0x20000017 = 0;
    *(uint8_t*)0x20000018 = 0;
    *(uint8_t*)0x20000019 = 0;
    *(uint8_t*)0x2000001a = 0;
    *(uint8_t*)0x2000001b = 0;
    *(uint8_t*)0x2000001c = 0;
    *(uint8_t*)0x2000001d = 0;
    *(uint8_t*)0x2000001e = 0;
    *(uint8_t*)0x2000001f = 0;
    *(uint32_t*)0x20000020 = 3;
    *(uint16_t*)0x20000024 = 0xa;
    *(uint16_t*)0x20000026 = htobe16(0x4e23);
    *(uint32_t*)0x20000028 = 7;
    *(uint8_t*)0x2000002c = -1;
    *(uint8_t*)0x2000002d = 1;
    *(uint8_t*)0x2000002e = 0;
    *(uint8_t*)0x2000002f = 0;
    *(uint8_t*)0x20000030 = 0;
    *(uint8_t*)0x20000031 = 0;
    *(uint8_t*)0x20000032 = 0;
    *(uint8_t*)0x20000033 = 0;
    *(uint8_t*)0x20000034 = 0;
    *(uint8_t*)0x20000035 = 0;
    *(uint8_t*)0x20000036 = 0;
    *(uint8_t*)0x20000037 = 0;
    *(uint8_t*)0x20000038 = 0;
    *(uint8_t*)0x20000039 = 0;
    *(uint8_t*)0x2000003a = 0;
    *(uint8_t*)0x2000003b = 1;
    *(uint32_t*)0x2000003c = 7;
    *(uint32_t*)0x20000040 = r[1];
    *(uint32_t*)0x20000044 = 1;
    syscall(__NR_write, r[0], 0x20000000, 0x48);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  use_temporary_dir();
  do_sandbox_none();
  return 0;
}