// https://syzkaller.appspot.com/bug?id=bc473f3bca5c7b8195ddb04780b92b87e08471a6
// 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/mount.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>

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 int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

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 const char* setup_fault()
{
  int fd = open("/proc/self/make-it-fail", O_WRONLY);
  if (fd == -1)
    return "CONFIG_FAULT_INJECTION is not enabled";
  close(fd);
  fd = open("/proc/thread-self/fail-nth", O_WRONLY);
  if (fd == -1)
    return "kernel does not have systematic fault injection support";
  close(fd);
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        return "failed to write fault injection file";
    }
  }
  return NULL;
}

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_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //    }
  //    mode: open_mode = 0x0 (8 bytes)
  //  ]
  memcpy((void*)0x200000000000, "./file0\000", 8);
  syscall(__NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000000ul,
          /*mode=*/0ul);
  //  mount$9p_virtio arguments: [
  //    src: ptr[in, buffer] {
  //      buffer: {73 79 7a 00} (length 0x4)
  //    }
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {39 70 00} (length 0x3)
  //    }
  //    flags: mount_flags = 0x2210088 (8 bytes)
  //    opts: ptr[inout, array[ANYUNION]] {
  //      array[ANYUNION] {
  //        union ANYUNION {
  //          ANYBLOB: buffer: {74 f5 02 6e 73 3d 76 69 72 74 69 6f 2c 70 72 69
  //          76 70 6f 72 74 2c 64 69 72 65 63 74 69 6f 2c 63 61 63 68 65 3d 6c
  //          6f 6f 73 65 2c 6d 73 69 7a 65 3d 30 78 30 30 30 30 30 30 30 30 30
  //          30 30 30 31 30 30 30} (length 0x43)
  //        }
  //      }
  //    }
  //  ]
  memcpy((void*)0x200000000140, "syz\000", 4);
  memcpy((void*)0x200000000180, "./file0\000", 8);
  memcpy((void*)0x2000000000c0, "9p\000", 3);
  memcpy((void*)0x200000000580,
         "\x74\xf5\x02\x6e\x73\x3d\x76\x69\x72\x74\x69\x6f\x2c\x70\x72\x69\x76"
         "\x70\x6f\x72\x74\x2c\x64\x69\x72\x65\x63\x74\x69\x6f\x2c\x63\x61\x63"
         "\x68\x65\x3d\x6c\x6f\x6f\x73\x65\x2c\x6d\x73\x69\x7a\x65\x3d\x30\x78"
         "\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x31\x30\x30\x30",
         67);
  syscall(__NR_mount, /*src=*/0x200000000140ul, /*dst=*/0x200000000180ul,
          /*type=*/0x2000000000c0ul,
          /*flags=MS_LAZYTIME|MS_POSIXACL|MS_RELATIME|MS_NOEXEC|MS_DIRSYNC*/
          0x2210088ul, /*opts=*/0x200000000580ul);
  //  chdir arguments: [
  //    dir: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
  //    }
  //  ]
  memcpy((void*)0x200000000100, "./file0\000", 8);
  syscall(__NR_chdir, /*dir=*/0x200000000100ul);
  //  openat$cgroup_ro arguments: [
  //    fd: fd_cgroup (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {62 6c 6b 69 6f 2e 74 68 72 6f 74 74 6c 65 2e 69 6f 5f 73 65
  //      72 76 69 63 65 5f 62 79 74 65 73 00} (length 0x20)
  //    }
  //    flags: const = 0x275a (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x200000000240, "blkio.throttle.io_service_bytes\000", 32);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000240ul,
                /*flags=*/0x275a, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  mmap arguments: [
  //    addr: VMA[0xb36000]
  //    len: len = 0xb36000 (4 bytes)
  //    prot: mmap_prot = 0x2 (8 bytes)
  //    flags: mmap_flags = 0x28011 (8 bytes)
  //    fd: fd (resource)
  //    offset: intptr = 0x0 (8 bytes)
  //  ]
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0xb36000,
          /*prot=PROT_WRITE*/ 2ul,
          /*flags=MAP_STACK|MAP_POPULATE|MAP_FIXED|MAP_SHARED*/ 0x28011ul,
          /*fd=*/r[0], /*offset=*/0ul);
  //  ftruncate arguments: [
  //    fd: fd (resource)
  //    len: intptr = 0x4a8e (8 bytes)
  //  ]
  syscall(__NR_ftruncate, /*fd=*/r[0], /*len=*/0x4a8eul);
  //  openat$cgroup_ro arguments: [
  //    fd: fd_cgroup (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {62 6c 6b 69 6f 2e 62 66 71 2e 69 6f 5f 77 61 69 74 5f 74 69
  //      6d 65 5f 72 65 63 75 72 73 69 76 65 00} (length 0x21)
  //    }
  //    flags: const = 0x275a (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x2000000001c0, "blkio.bfq.io_wait_time_recursive\000", 33);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x2000000001c0ul,
                /*flags=*/0x275a, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  //  sendmsg$kcm arguments: [
  //    fd: sock_kcm (resource)
  //    msg: ptr[in, send_msghdr] {
  //      send_msghdr {
  //        msg_name: nil
  //        msg_namelen: len = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        msg_iov: ptr[in, array[iovec[in, array[int8]]]] {
  //          array[iovec[in, array[int8]]] {
  //            iovec[in, array[int8]] {
  //              addr: ptr[in, buffer] {
  //                buffer: {1c 39 35} (length 0x3)
  //              }
  //              len: len = 0x3 (8 bytes)
  //            }
  //          }
  //        }
  //        msg_iovlen: len = 0x1 (8 bytes)
  //        msg_control: nil
  //        msg_controllen: bytesize = 0x0 (8 bytes)
  //        msg_flags: const = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: send_flags = 0x40000 (8 bytes)
  //  ]
  *(uint64_t*)0x200000000040 = 0;
  *(uint32_t*)0x200000000048 = 0;
  *(uint64_t*)0x200000000050 = 0x200000000580;
  *(uint64_t*)0x200000000580 = 0x200000002900;
  memcpy((void*)0x200000002900, "\x1c\x39\x35", 3);
  *(uint64_t*)0x200000000588 = 3;
  *(uint64_t*)0x200000000058 = 1;
  *(uint64_t*)0x200000000060 = 0;
  *(uint64_t*)0x200000000068 = 0;
  *(uint32_t*)0x200000000070 = 0;
  syscall(__NR_sendmsg, /*fd=*/(intptr_t)-1, /*msg=*/0x200000000040ul,
          /*f=MSG_BATCH*/ 0x40000ul);
  //  mmap arguments: [
  //    addr: VMA[0xb36000]
  //    len: len = 0xb36000 (4 bytes)
  //    prot: mmap_prot = 0x2 (8 bytes)
  //    flags: mmap_flags = 0x28011 (8 bytes)
  //    fd: fd (resource)
  //    offset: intptr = 0x0 (8 bytes)
  //  ]
  inject_fault(4);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0xb36000,
          /*prot=PROT_WRITE*/ 2ul,
          /*flags=MAP_STACK|MAP_POPULATE|MAP_FIXED|MAP_SHARED*/ 0x28011ul,
          /*fd=*/r[1], /*offset=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*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=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_fault())) {
    fprintf(stderr, "reproducer setup failed: fault injection: %s\n", reason);
    exit(1);
  }
  loop();
  return 0;
}