// 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[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  bpf$BPF_BTF_LOAD arguments: [
  //    cmd: const = 0x12 (8 bytes)
  //    arg: ptr[in, bpf_btf_load] {
  //      bpf_btf_load {
  //        btf: ptr[in, bpf_btf_program] {
  //          bpf_btf_program {
  //            header: btf_header {
  //              magic: const = 0xeb9f (2 bytes)
  //              version: const = 0x1 (1 bytes)
  //              flags: const = 0x0 (1 bytes)
  //              hdr_len: const = 0x18 (4 bytes)
  //              type_off: const = 0x0 (4 bytes)
  //              type_len: bytesize = 0x1c (4 bytes)
  //              str_off: bytesize = 0x1c (4 bytes)
  //              str_len: bytesize = 0x2 (4 bytes)
  //              types: array[btf_type] {
  //                union btf_type {
  //                  datasec: btf_type_datasec {
  //                    name_off: int32 = 0x0 (4 bytes)
  //                    info_vlen: len = 0x0 (2 bytes)
  //                    info_pad: const = 0x0 (1 bytes)
  //                    info_typ: const = 0xf (1 bytes)
  //                    size: bytesize = 0x3 (4 bytes)
  //                    secinfo: array[btf_var_secinfo] {
  //                    }
  //                    data: buffer: {63 d0 38} (length 0x3)
  //                  }
  //                }
  //                union btf_type {
  //                  datasec: btf_type_datasec {
  //                    name_off: int32 = 0x0 (4 bytes)
  //                    info_vlen: len = 0x0 (2 bytes)
  //                    info_pad: const = 0x0 (1 bytes)
  //                    info_typ: const = 0xf (1 bytes)
  //                    size: bytesize = 0x1 (4 bytes)
  //                    secinfo: array[btf_var_secinfo] {
  //                    }
  //                    data: buffer: {de} (length 0x1)
  //                  }
  //                }
  //              }
  //            }
  //            strings: bpf_btf_strings {
  //              z0: const = 0x0 (1 bytes)
  //              data: array[bpf_btf_strings_elem] {
  //              }
  //              z1: const = 0x0 (1 bytes)
  //            }
  //          }
  //        }
  //        btf_log_buf: nil
  //        btf_size: bytesize = 0x36 (4 bytes)
  //        btf_log_size: bytesize = 0x0 (4 bytes)
  //        btf_log_level: int32 = 0x0 (4 bytes)
  //        btf_log_true_size: int32 = 0x0 (4 bytes)
  //        btf_flags: btf_load_flags = 0x0 (4 bytes)
  //        btf_token_fd: union _bpf_btf_load_btf_token_fd_wrapper {
  //          void: buffer: {} (length 0x0)
  //        }
  //        pad: union _bpf_btf_load_pad_wrapper {
  //          value: const = 0x0 (4 bytes)
  //        }
  //      }
  //    }
  //    size: len = 0x28 (8 bytes)
  //  ]
  //  returns fd_btf
  *(uint64_t*)0x200000000080 = 0x200000000000;
  *(uint16_t*)0x200000000000 = 0xeb9f;
  *(uint8_t*)0x200000000002 = 1;
  *(uint8_t*)0x200000000003 = 0;
  *(uint32_t*)0x200000000004 = 0x18;
  *(uint32_t*)0x200000000008 = 0;
  *(uint32_t*)0x20000000000c = 0x1c;
  *(uint32_t*)0x200000000010 = 0x1c;
  *(uint32_t*)0x200000000014 = 2;
  *(uint32_t*)0x200000000018 = 0;
  *(uint16_t*)0x20000000001c = 0;
  *(uint8_t*)0x20000000001e = 0;
  *(uint8_t*)0x20000000001f = 0xf;
  *(uint32_t*)0x200000000020 = 3;
  memcpy((void*)0x200000000024, "\x63\xd0\x38", 3);
  *(uint32_t*)0x200000000027 = 0;
  *(uint16_t*)0x20000000002b = 0;
  *(uint8_t*)0x20000000002d = 0;
  *(uint8_t*)0x20000000002e = 0xf;
  *(uint32_t*)0x20000000002f = 1;
  memset((void*)0x200000000033, 222, 1);
  *(uint8_t*)0x200000000034 = 0;
  *(uint8_t*)0x200000000035 = 0;
  *(uint64_t*)0x200000000088 = 0;
  *(uint32_t*)0x200000000090 = 0x36;
  *(uint32_t*)0x200000000094 = 0;
  *(uint32_t*)0x200000000098 = 0;
  *(uint32_t*)0x20000000009c = 0;
  *(uint32_t*)0x2000000000a0 = 0;
  *(uint32_t*)0x2000000000a4 = 0;
  syscall(__NR_bpf, /*cmd=*/0x12ul, /*arg=*/0x200000000080ul, /*size=*/0x28ul);
  //  socket arguments: [
  //    domain: socket_domain = 0xa (8 bytes)
  //    type: socket_type = 0x3 (8 bytes)
  //    proto: int32 = 0x4 (4 bytes)
  //  ]
  //  returns sock
  res = syscall(__NR_socket, /*domain=AF_INET6*/ 0xaul, /*type=SOCK_RAW*/ 3ul,
                /*proto=*/4);
  if (res != -1)
    r[0] = res;
  //  ioctl$sock_SIOCBRDELBR arguments: [
  //    fd: sock (resource)
  //    cmd: const = 0x89a2 (4 bytes)
  //    arg: ptr[in, buffer] {
  //      buffer: {62 72 69 64 67 65 30 00 00 00 00 00 00 00 00 00} (length
  //      0x10)
  //    }
  //  ]
  memcpy((void*)0x200000000000, "bridge0\000\000\000\000\000\000\000\000\000",
         16);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x89a2, /*arg=*/0x200000000000ul);
}
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;
  loop();
  return 0;
}