// https://syzkaller.appspot.com/bug?id=0b210638616bb68109e9642158d4c0072770ae1c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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>

#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 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");
}

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,
                 0x0};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  *(uint32_t*)0x20000180 = 0;
  syscall(__NR_bpf, /*cmd=*/0x13ul, /*arg=*/0x20000180ul, /*size=*/4ul);
  syscall(__NR_bpf, /*cmd=*/0xful, /*arg=*/0ul, /*size=*/0ul);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0ul, /*size=*/0ul);
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=SOCK_DGRAM*/ 2ul,
                /*proto=*/0);
  if (res != -1)
    r[0] = res;
  *(uint64_t*)0x20000600 = 0;
  *(uint32_t*)0x20000608 = 0;
  *(uint64_t*)0x20000610 = 0x20000000;
  *(uint64_t*)0x20000000 = 0;
  *(uint64_t*)0x20000008 = 0;
  *(uint64_t*)0x20000618 = 1;
  *(uint64_t*)0x20000620 = 0;
  *(uint64_t*)0x20000628 = 0;
  *(uint32_t*)0x20000630 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x20000600ul, /*f=*/0ul);
  syscall(__NR_socket, /*domain=*/2ul, /*type=SOCK_SEQPACKET*/ 5ul,
          /*proto=*/0x84);
  res = syscall(__NR_socket, /*domain=*/1ul, /*type=SOCK_SEQPACKET*/ 5ul,
                /*proto=*/0);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_socket, /*domain=*/0x1dul, /*type=*/2ul, /*proto=*/2);
  if (res != -1)
    r[2] = res;
  memcpy((void*)0x20000100, "vcan0\000\000\000\000\000\000\000\000\000\000\000",
         16);
  res = syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x8933, /*arg=*/0x20000100ul);
  if (res != -1)
    r[3] = *(uint32_t*)0x20000110;
  *(uint16_t*)0x200000c0 = 0x1d;
  *(uint32_t*)0x200000c4 = r[3];
  *(uint32_t*)0x200000c8 = 0;
  *(uint32_t*)0x200000cc = 0;
  syscall(__NR_connect, /*fd=*/r[2], /*addr=*/0x200000c0ul, /*len=*/0x10ul);
  *(uint64_t*)0x20000200 = 0;
  *(uint32_t*)0x20000208 = 0;
  *(uint64_t*)0x20000210 = 0x20000040;
  *(uint64_t*)0x20000040 = 0x20000580;
  memcpy((void*)0x20000580,
         "\x01\x00\x00\x00\x03\xec\xe1\xe4\x0a\xd8\x87\x14\x61\xab\x08\x00",
         16);
  *(uint64_t*)0x20000590 = 0;
  *(uint64_t*)0x20000598 = 0;
  *(uint64_t*)0x200005a0 = 0;
  *(uint64_t*)0x200005a8 = r[1];
  memcpy((void*)0x200005b0, "\x3b\xf8\x1b\xb9\xf9", 5);
  *(uint64_t*)0x20000048 = 0x20000600;
  *(uint64_t*)0x20000218 = 1;
  *(uint64_t*)0x20000220 = 0;
  *(uint64_t*)0x20000228 = 0;
  *(uint32_t*)0x20000230 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x20000200ul, /*f=*/0ul);
  *(uint32_t*)0x20000040 = 0;
  *(uint32_t*)0x20000044 = 0x10;
  *(uint64_t*)0x20000048 = 0x20000000;
  *(uint16_t*)0x20000000 = 2;
  *(uint16_t*)0x20000002 = htobe16(0);
  *(uint32_t*)0x20000004 = htobe32(0xa010101);
  *(uint32_t*)0x20000080 = 0x10;
  syscall(__NR_getsockopt, /*fd=*/-1, /*level=*/0x84, /*opt=*/0x6f,
          /*val=*/0x20000040ul, /*len=*/0x20000080ul);
  syscall(__NR_getsockopt, /*fd=*/-1, /*level=*/0x84, /*opt=*/0x1d,
          /*val=*/0x20000140ul, /*len=*/0ul);
  memcpy((void*)0x20000080, "blkio.bfq.io_serviced\000", 22);
  syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000080ul,
          /*flags=*/0x26e1, /*mode=*/0);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}