// https://syzkaller.appspot.com/bug?id=2a622455acd7051c6cf85c360cd116118a587726
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void execute_one();
extern unsigned long long procid;

static void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      execute_one();
      int fd;
      for (fd = 3; fd < 30; fd++)
        close(fd);
      doexit(0);
    }

    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid) {
        break;
      }
      usleep(1000);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

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 (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (__atomic_load_n(&running, __ATOMIC_RELAXED))
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

#ifndef __NR_userfaultfd
#define __NR_userfaultfd 323
#endif

uint64_t r[3] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_pipe2, 0x20000140, 0);
    if (res != -1)
      r[0] = *(uint32_t*)0x20000144;
    break;
  case 1:
    memcpy((void*)0x20000080, "bbr", 4);
    syscall(__NR_setsockopt, r[0], 6, 0xd, 0x20000080, 4);
    break;
  case 2:
    res = syscall(__NR_getpgrp, -1);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    syscall(__NR_ptrace, 1, r[1], 0x20000200);
    break;
  case 4:
    syscall(__NR_userfaultfd, 0);
    break;
  case 5:
    memcpy((void*)0x20000100, "./file0", 8);
    res = syscall(__NR_creat, 0x20000100, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 6:
    memcpy((void*)0x20000600, "\x62\x72\x6f\x75\x74\x65\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x20000620 = 0x20;
    *(uint32_t*)0x20000624 = 1;
    *(uint32_t*)0x20000628 = 0x218;
    *(uint64_t*)0x20000630 = 0;
    *(uint64_t*)0x20000638 = 0;
    *(uint64_t*)0x20000640 = 0;
    *(uint64_t*)0x20000648 = 0;
    *(uint64_t*)0x20000650 = 0;
    *(uint64_t*)0x20000658 = 0x20000240;
    *(uint32_t*)0x20000660 = 0;
    *(uint64_t*)0x20000668 = 0x20000080;
    *(uint64_t*)0x20000670 = 0x20000240;
    *(uint32_t*)0x20000240 = 0;
    memcpy((void*)0x20000244, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x20000264 = 0;
    *(uint32_t*)0x20000268 = -1;
    *(uint32_t*)0x2000026c = 0;
    *(uint32_t*)0x20000270 = 0;
    memcpy((void*)0x20000274, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x20000294 = 0;
    *(uint32_t*)0x20000298 = -1;
    *(uint32_t*)0x2000029c = 0;
    *(uint32_t*)0x200002a0 = 0;
    memcpy((void*)0x200002a4, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x200002c4 = 0;
    *(uint32_t*)0x200002c8 = -1;
    *(uint32_t*)0x200002cc = 1;
    *(uint32_t*)0x200002d0 = 0x11;
    *(uint32_t*)0x200002d4 = 0;
    *(uint16_t*)0x200002d8 = htobe16(0);
    memcpy((void*)0x200002da,
           "\x6e\x72\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           16);
    memcpy((void*)0x200002ea,
           "\x79\x61\x6d\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           16);
    memcpy((void*)0x200002fa,
           "\x79\x61\x6d\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           16);
    memcpy((void*)0x2000030a,
           "\x76\x65\x74\x68\x31\x5f\x74\x6f\x5f\x74\x65\x61\x6d\x00\x00\x00",
           16);
    *(uint8_t*)0x2000031a = 1;
    *(uint8_t*)0x2000031b = 0x80;
    *(uint8_t*)0x2000031c = 0xc2;
    *(uint8_t*)0x2000031d = 0;
    *(uint8_t*)0x2000031e = 0;
    *(uint8_t*)0x2000031f = 0;
    *(uint8_t*)0x20000320 = 0;
    *(uint8_t*)0x20000321 = 0;
    *(uint8_t*)0x20000322 = 0;
    *(uint8_t*)0x20000323 = 0;
    *(uint8_t*)0x20000324 = 0;
    *(uint8_t*)0x20000325 = 0;
    *(uint8_t*)0x20000326 = 0xaa;
    *(uint8_t*)0x20000327 = 0xaa;
    *(uint8_t*)0x20000328 = 0xaa;
    *(uint8_t*)0x20000329 = 0xaa;
    *(uint8_t*)0x2000032a = 0xaa;
    *(uint8_t*)0x2000032b = 0;
    *(uint8_t*)0x2000032c = 0;
    *(uint8_t*)0x2000032d = 0;
    *(uint8_t*)0x2000032e = 0;
    *(uint8_t*)0x2000032f = 0;
    *(uint8_t*)0x20000330 = 0;
    *(uint8_t*)0x20000331 = 0;
    *(uint32_t*)0x20000334 = 0xb0;
    *(uint32_t*)0x20000338 = 0x158;
    *(uint32_t*)0x2000033c = 0x188;
    memcpy((void*)0x20000340, "\x64\x65\x76\x67\x72\x6f\x75\x70\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x20000360 = 0x18;
    *(uint32_t*)0x20000368 = 0;
    *(uint32_t*)0x2000036c = 0;
    *(uint32_t*)0x20000370 = 0;
    *(uint32_t*)0x20000374 = 0;
    *(uint32_t*)0x20000378 = 0;
    memcpy((void*)0x20000380, "\x72\x65\x64\x69\x72\x65\x63\x74\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x200003a0 = 8;
    *(uint32_t*)0x200003a8 = 0xfffffffc;
    memcpy((void*)0x200003b0, "\x6e\x66\x6c\x6f\x67\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x200003d0 = 0x50;
    *(uint32_t*)0x200003d8 = 0;
    *(uint16_t*)0x200003dc = 0;
    *(uint16_t*)0x200003de = 0;
    *(uint16_t*)0x200003e0 = 0;
    *(uint16_t*)0x200003e2 = 0;
    memcpy((void*)0x200003e4,
           "\xec\x8c\xc3\x59\x09\x61\x55\xb1\x33\x58\x06\x76\x5b\xdf\x9d\x8d"
           "\xc3\x02\x47\x24\xca\x1b\x94\x27\xf5\xab\xa6\xe4\x0e\x93\xc3\xa7"
           "\xb3\x9e\x15\x1d\x82\x92\x25\x86\x03\x8d\xd3\x4e\x1e\xf7\xb1\x41"
           "\x0a\xc3\xd9\xce\x09\xd5\xe7\xd0\x23\x36\xf7\x7e\x3d\x76\xc9\x19",
           64);
    memcpy((void*)0x20000428, "\x41\x55\x44\x49\x54\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00\x00\x00",
           32);
    *(uint32_t*)0x20000448 = 8;
    *(uint8_t*)0x20000450 = 4;
    syscall(__NR_setsockopt, -1, 0, 0x80, 0x20000600, 0x290);
    break;
  case 7:
    memcpy((void*)0x20000000, "./file0", 8);
    memcpy((void*)0x20000040, "9p", 3);
    memcpy((void*)0x200001c0, "trans=fd,", 9);
    memcpy((void*)0x200001c9, "rfdno", 5);
    *(uint8_t*)0x200001ce = 0x3d;
    sprintf((char*)0x200001cf, "0x%016llx", (long long)r[0]);
    *(uint8_t*)0x200001e1 = 0x2c;
    memcpy((void*)0x200001e2, "wfdno", 5);
    *(uint8_t*)0x200001e7 = 0x3d;
    sprintf((char*)0x200001e8, "0x%016llx", (long long)r[2]);
    *(uint8_t*)0x200001fa = 0x2c;
    *(uint8_t*)0x200001fb = 0;
    syscall(__NR_mount, 0, 0x20000000, 0x20000040, 0, 0x200001c0);
    break;
  }
}

void execute_one()
{
  execute(8);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}