// https://syzkaller.appspot.com/bug?id=8859c3c948f5ef98bd2bd2dfa3f928ee5a740f2c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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;                                                                        \
  })

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);
  install_segv_handler();
  intptr_t res = 0;
  NONFAILING(memcpy((void*)0x200020c0, "./file0\000", 8));
  syscall(__NR_mkdir, /*path=*/0x200020c0ul, /*mode=S_IWUSR*/ 0x80ul);
  NONFAILING(memcpy((void*)0x20000140, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x20000100, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x20000040, "incremental-fs\000", 15));
  syscall(__NR_mount, /*src=*/0x20000140ul, /*dst=*/0x20000100ul,
          /*type=*/0x20000040ul, /*flags=*/0ul, /*opts=*/0ul);
  NONFAILING(memcpy((void*)0x20000080, ".pending_reads\000", 15));
  syscall(__NR_openat, /*fd=*/-1, /*file=*/0x20000080ul, /*flags=*/0ul,
          /*mode=*/0ul);
  NONFAILING(memcpy((void*)0x20000180, "cgroup.controllers\000", 19));
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000180ul,
                /*flags=*/0x275aul, /*mode=*/0ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(memcpy((void*)0x20000000, "\x49\xcc\x03\xcf", 4));
  syscall(__NR_write, /*fd=*/r[0], /*data=*/0x20000000ul, /*len=*/0x6db6e559ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x3000ul,
          /*prot=PROT_READ*/ 1ul,
          /*flags=MAP_NONBLOCK|MAP_FIXED|MAP_PRIVATE*/ 0x10012ul, /*fd=*/r[0],
          /*offset=*/0ul);
  NONFAILING(memcpy((void*)0x20000100, ".\000", 2));
  res = syscall(__NR_open, /*file=*/0x20000100ul, /*flags=*/0ul, /*mode=*/0ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(memcpy((void*)0x20000080, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x20000000, "./file1\000", 8));
  syscall(__NR_linkat, /*oldfd=*/r[1], /*old=*/0x20000080ul, /*newfd=*/r[1],
          /*new=*/0x20000000ul, /*flags=*/0ul);
  return 0;
}