// https://syzkaller.appspot.com/bug?id=d32fc291099838eee8a17f6a00b384ac527d0eda
// 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>

#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 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[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  perf_event_open arguments: [
  //    attr: nil
  //    pid: pid (resource)
  //    cpu: intptr = 0xffffffffffffffff (8 bytes)
  //    group: fd_perf (resource)
  //    flags: perf_flags = 0x0 (8 bytes)
  //  ]
  //  returns fd_perf
  syscall(__NR_perf_event_open, /*attr=*/0ul, /*pid=*/0, /*cpu=*/(intptr_t)-1,
          /*group=*/(intptr_t)-1, /*flags=*/0ul);
  //  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 = 0xc (4 bytes)
  //              str_off: bytesize = 0xc (4 bytes)
  //              str_len: bytesize = 0x2 (4 bytes)
  //              types: array[btf_type] {
  //                union btf_type {
  //                  volatile: btf_type_ref_t[BTF_KIND_VOLATILE] {
  //                    name_off: int32 = 0x0 (4 bytes)
  //                    info_vlen: const = 0x0 (2 bytes)
  //                    info_pad: const = 0x0 (1 bytes)
  //                    info_typ: const = 0x9 (1 bytes)
  //                    type: int32 = 0x0 (4 bytes)
  //                  }
  //                }
  //              }
  //            }
  //            strings: bpf_btf_strings {
  //              z0: const = 0x0 (1 bytes)
  //              data: array[bpf_btf_strings_elem] {
  //              }
  //              z1: const = 0x0 (1 bytes)
  //            }
  //          }
  //        }
  //        btf_log_buf: ptr[out, buffer] {
  //          buffer: (DirOut)
  //        }
  //        btf_size: bytesize = 0x26 (4 bytes)
  //        btf_log_size: bytesize = 0xc4 (4 bytes)
  //        btf_log_level: int32 = 0x1 (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*)0x2000000000c0 = 0x2000000002c0;
  *(uint16_t*)0x2000000002c0 = 0xeb9f;
  *(uint8_t*)0x2000000002c2 = 1;
  *(uint8_t*)0x2000000002c3 = 0;
  *(uint32_t*)0x2000000002c4 = 0x18;
  *(uint32_t*)0x2000000002c8 = 0;
  *(uint32_t*)0x2000000002cc = 0xc;
  *(uint32_t*)0x2000000002d0 = 0xc;
  *(uint32_t*)0x2000000002d4 = 2;
  *(uint32_t*)0x2000000002d8 = 0;
  *(uint16_t*)0x2000000002dc = 0;
  *(uint8_t*)0x2000000002de = 0;
  *(uint8_t*)0x2000000002df = 9;
  *(uint32_t*)0x2000000002e0 = 0;
  *(uint8_t*)0x2000000002e4 = 0;
  *(uint8_t*)0x2000000002e5 = 0;
  *(uint64_t*)0x2000000000c8 = 0x200000000700;
  *(uint32_t*)0x2000000000d0 = 0x26;
  *(uint32_t*)0x2000000000d4 = 0xc4;
  *(uint32_t*)0x2000000000d8 = 1;
  *(uint32_t*)0x2000000000dc = 0;
  *(uint32_t*)0x2000000000e0 = 0;
  *(uint32_t*)0x2000000000e4 = 0;
  inject_fault(18);
  res = syscall(__NR_bpf, /*cmd=*/0x12ul, /*arg=*/0x2000000000c0ul,
                /*size=*/0x28ul);
  if (res != -1)
    r[0] = res;
  //  bpf$MAP_CREATE arguments: [
  //    cmd: const = 0x0 (8 bytes)
  //    arg: ptr[in, bpf_map_create_arg] {
  //      union bpf_map_create_arg {
  //        base: bpf_map_create_arg_t[flags[bpf_map_type, int32], int32, int32,
  //        int32, flags[map_flags, int32], const[0, int64]] {
  //          type: bpf_map_type = 0x15 (4 bytes)
  //          ksize: int32 = 0x8 (4 bytes)
  //          vsize: int32 = 0x4 (4 bytes)
  //          max: int32 = 0x0 (4 bytes)
  //          flags: map_flags = 0x0 (4 bytes)
  //          inner: fd_bpf_map (resource)
  //          node: int32 = 0x0 (4 bytes)
  //          map_name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //          00} (length 0x10) map_ifindex: ifindex (resource) btf_fd: fd_btf
  //          (resource) btf_key_type_id: int32 = 0x0 (4 bytes)
  //          btf_value_type_id: int32 = 0x1 (4 bytes)
  //          btf_vmlinux_type_id: int32 = 0x0 (4 bytes)
  //          map_extra: const = 0x0 (8 bytes)
  //          value_type_btf_obj_fd: union
  //          _bpf_map_create_arg_t[flags[bpf_map_type, int32], int32, int32,
  //          int32, flags[map_flags, int32], const[0,
  //          int64]]_value_type_btf_obj_fd_wrapper {
  //            void: buffer: {} (length 0x0)
  //          }
  //          pad1: union _bpf_map_create_arg_t[flags[bpf_map_type, int32],
  //          int32, int32, int32, flags[map_flags, int32], const[0,
  //          int64]]_pad1_wrapper {
  //            value: const = 0x0 (4 bytes)
  //          }
  //          map_token_fd: union _bpf_map_create_arg_t[flags[bpf_map_type,
  //          int32], int32, int32, int32, flags[map_flags, int32], const[0,
  //          int64]]_map_token_fd_wrapper {
  //            void: buffer: {} (length 0x0)
  //          }
  //          pad2: union _bpf_map_create_arg_t[flags[bpf_map_type, int32],
  //          int32, int32, int32, flags[map_flags, int32], const[0,
  //          int64]]_pad2_wrapper {
  //            value: const = 0x0 (4 bytes)
  //          }
  //        }
  //      }
  //    }
  //    size: len = 0x48 (8 bytes)
  //  ]
  //  returns fd_bpf_map
  *(uint32_t*)0x200000000800 = 0x15;
  *(uint32_t*)0x200000000804 = 8;
  *(uint32_t*)0x200000000808 = 4;
  *(uint32_t*)0x20000000080c = 0;
  *(uint32_t*)0x200000000810 = 0;
  *(uint32_t*)0x200000000814 = 1;
  *(uint32_t*)0x200000000818 = 0;
  memset((void*)0x20000000081c, 0, 16);
  *(uint32_t*)0x20000000082c = 0;
  *(uint32_t*)0x200000000830 = r[0];
  *(uint32_t*)0x200000000834 = 0;
  *(uint32_t*)0x200000000838 = 1;
  *(uint32_t*)0x20000000083c = 0;
  *(uint64_t*)0x200000000840 = 0;
  *(uint32_t*)0x200000000848 = 0;
  *(uint32_t*)0x20000000084c = 0;
  syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200000000800ul, /*size=*/0x48ul);
}
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()))
    printf("the reproducer may not work as expected: fault injection setup "
           "failed: %s\n",
           reason);
  loop();
  return 0;
}