// https://syzkaller.appspot.com/bug?id=6198203ac7c40536c3fe70ae3c8d22d60a333aa6
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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 setup_fault()
{
  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)
        exit(1);
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

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);
  setup_fault();
  install_segv_handler();
  intptr_t res = 0;
  NONFAILING(*(uint32_t*)0x200009c0 = 5);
  NONFAILING(*(uint32_t*)0x200009c4 = 4);
  NONFAILING(*(uint32_t*)0x200009c8 = 0xfff);
  NONFAILING(*(uint32_t*)0x200009cc = 5);
  NONFAILING(*(uint32_t*)0x200009d0 = 0);
  NONFAILING(*(uint32_t*)0x200009d4 = -1);
  NONFAILING(*(uint32_t*)0x200009d8 = 0);
  NONFAILING(memset((void*)0x200009dc, 0, 16));
  NONFAILING(*(uint32_t*)0x200009ec = 0);
  NONFAILING(*(uint32_t*)0x200009f0 = -1);
  NONFAILING(*(uint32_t*)0x200009f4 = 0);
  NONFAILING(*(uint32_t*)0x200009f8 = 0);
  NONFAILING(*(uint32_t*)0x200009fc = 0);
  NONFAILING(*(uint64_t*)0x20000a00 = 0);
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200009c0ul, /*size=*/0x48ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x200000c0 = 0);
  NONFAILING(*(uint32_t*)0x200000c4 = 0xc);
  NONFAILING(*(uint64_t*)0x200000c8 = 0x20000440);
  NONFAILING(memcpy((void*)0x20000440,
                    "\x18\x00\x00\x00\x01\x07\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x18\x11\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000454 = r[0]);
  NONFAILING(memcpy(
      (void*)0x20000458,
      "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x08\x00\x00\x00\x00\x00\x00\x7b\x8a"
      "\xf8\xff\x00\x00\x00\x00\xbf\xa2\x00\x00\x00\x00\x00\x00\x07\x02\x00\x00"
      "\xf8\xff\xff\xff\xb7\x03\x00\x00\x08\x00\x00\x00\xb7\x04\x00\x00\x00\x00"
      "\x00\x00\x85\x00\x00\x00\x01\x00\x00\x00\x95",
      65));
  NONFAILING(*(uint64_t*)0x200000d0 = 0);
  NONFAILING(*(uint32_t*)0x200000d8 = 0);
  NONFAILING(*(uint32_t*)0x200000dc = 0);
  NONFAILING(*(uint64_t*)0x200000e0 = 0);
  NONFAILING(*(uint32_t*)0x200000e8 = 0);
  NONFAILING(*(uint32_t*)0x200000ec = 0);
  NONFAILING(memset((void*)0x200000f0, 0, 16));
  NONFAILING(*(uint32_t*)0x20000100 = 0);
  NONFAILING(*(uint32_t*)0x20000104 = 0);
  NONFAILING(*(uint32_t*)0x20000108 = -1);
  NONFAILING(*(uint32_t*)0x2000010c = 0);
  NONFAILING(*(uint64_t*)0x20000110 = 0);
  NONFAILING(*(uint32_t*)0x20000118 = 0);
  NONFAILING(*(uint32_t*)0x2000011c = 0);
  NONFAILING(*(uint64_t*)0x20000120 = 0);
  NONFAILING(*(uint32_t*)0x20000128 = 0);
  NONFAILING(*(uint32_t*)0x2000012c = 0);
  NONFAILING(*(uint32_t*)0x20000130 = 0);
  NONFAILING(*(uint32_t*)0x20000134 = 0);
  NONFAILING(*(uint64_t*)0x20000138 = 0);
  NONFAILING(*(uint64_t*)0x20000140 = 0);
  NONFAILING(*(uint32_t*)0x20000148 = 0);
  NONFAILING(*(uint32_t*)0x2000014c = 0);
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul);
  NONFAILING(*(uint32_t*)0x200008c0 = 6);
  NONFAILING(*(uint32_t*)0x200008c4 = 0xc);
  NONFAILING(*(uint64_t*)0x200008c8 = 0x20000440);
  NONFAILING(*(uint64_t*)0x200008d0 = 0x20000240);
  NONFAILING(memcpy((void*)0x20000240, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x200008d8 = 0);
  NONFAILING(*(uint32_t*)0x200008dc = 0);
  NONFAILING(*(uint64_t*)0x200008e0 = 0);
  NONFAILING(*(uint32_t*)0x200008e8 = 0);
  NONFAILING(*(uint32_t*)0x200008ec = 0);
  NONFAILING(memset((void*)0x200008f0, 0, 16));
  NONFAILING(*(uint32_t*)0x20000900 = 0);
  NONFAILING(*(uint32_t*)0x20000904 = 0);
  NONFAILING(*(uint32_t*)0x20000908 = -1);
  NONFAILING(*(uint32_t*)0x2000090c = 0);
  NONFAILING(*(uint64_t*)0x20000910 = 0);
  NONFAILING(*(uint32_t*)0x20000918 = 0);
  NONFAILING(*(uint32_t*)0x2000091c = 0);
  NONFAILING(*(uint64_t*)0x20000920 = 0);
  NONFAILING(*(uint32_t*)0x20000928 = 0);
  NONFAILING(*(uint32_t*)0x2000092c = 0);
  NONFAILING(*(uint32_t*)0x20000930 = 0);
  NONFAILING(*(uint32_t*)0x20000934 = 0);
  NONFAILING(*(uint64_t*)0x20000938 = 0);
  NONFAILING(*(uint64_t*)0x20000940 = 0);
  NONFAILING(*(uint32_t*)0x20000948 = 0);
  NONFAILING(*(uint32_t*)0x2000094c = 0);
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200008c0ul, /*size=*/0x90ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint32_t*)0x20000000 = r[1]);
  NONFAILING(*(uint32_t*)0x20000004 = 0xf);
  NONFAILING(*(uint32_t*)0x20000008 = 0);
  NONFAILING(*(uint32_t*)0x2000000c = 0);
  NONFAILING(*(uint64_t*)0x20000010 = 0);
  NONFAILING(*(uint64_t*)0x20000018 = 0);
  NONFAILING(*(uint32_t*)0x20000020 = 0);
  NONFAILING(*(uint32_t*)0x20000024 = 0);
  NONFAILING(*(uint32_t*)0x20000028 = 0);
  NONFAILING(*(uint32_t*)0x2000002c = 0);
  NONFAILING(*(uint64_t*)0x20000030 = 0);
  NONFAILING(*(uint64_t*)0x20000038 = 0);
  NONFAILING(*(uint32_t*)0x20000040 = 2);
  NONFAILING(*(uint32_t*)0x20000044 = 0);
  NONFAILING(*(uint32_t*)0x20000048 = 0);
  inject_fault(8);
  syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x20000000ul, /*size=*/0x50ul);
  return 0;
}