// https://syzkaller.appspot.com/bug?id=99d20bc3c113300af0da977cb358bec65e979309
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#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/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 __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 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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  NONFAILING(*(uint64_t*)0x4000000003c0 = 0);
  NONFAILING(*(uint32_t*)0x4000000003c8 = 0);
  NONFAILING(*(uint64_t*)0x4000000003d0 = 0);
  NONFAILING(*(uint64_t*)0x4000000003d8 = 1);
  NONFAILING(*(uint64_t*)0x4000000003e0 = 0);
  NONFAILING(*(uint64_t*)0x4000000003e8 = 0);
  NONFAILING(*(uint32_t*)0x4000000003f0 = 0x48850);
  syscall(__NR_sendmsg, /*fd=*/-1, /*msg=*/0x4000000003c0ul, /*f=*/0ul);
  NONFAILING(memcpy((void*)0x400000000040, "./file0\000", 8));
  syscall(__NR_mknodat, /*dirfd=*/0xffffff9c, /*file=*/0x400000000040ul,
          /*mode=*/0ul, /*dev=*/0);
  res = syscall(__NR_pipe2, /*pipefd=*/0x4000000001c0ul, /*flags=*/0ul);
  if (res != -1) {
    NONFAILING(r[0] = *(uint32_t*)0x4000000001c0);
    NONFAILING(r[1] = *(uint32_t*)0x4000000001c4);
  }
  NONFAILING(memcpy((void*)0x400000000300,
                    "\x15\x00\x00\x00\x65\xff\xff\x01\x7f\x00\x0e\x08\x00\x39"
                    "\x50\x32\x30\x30\x30",
                    19));
  syscall(__NR_write, /*fd=*/r[1], /*data=*/0x400000000300ul, /*size=*/0x15ul);
  res = syscall(__NR_dup, /*oldfd=*/r[1]);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint32_t*)0x400000000000 = 0x18);
  NONFAILING(*(uint32_t*)0x400000000004 = 0);
  NONFAILING(*(uint64_t*)0x400000000008 = 0);
  NONFAILING(*(uint64_t*)0x400000000010 = 0);
  syscall(__NR_write, /*fd=*/r[2], /*arg=*/0x400000000000ul, /*len=*/0x18ul);
  NONFAILING(memset((void*)0x4000000003c0, 176, 1));
  syscall(__NR_write, /*fd=*/r[2], /*arg=*/0x4000000003c0ul, /*len=*/0xb0ul);
  NONFAILING(*(uint32_t*)0x400000000480 = 0x18);
  NONFAILING(*(uint32_t*)0x400000000484 = 0);
  NONFAILING(*(uint64_t*)0x400000000488 = 0);
  NONFAILING(*(uint32_t*)0x400000000490 = 0);
  NONFAILING(*(uint32_t*)0x400000000494 = 0);
  syscall(__NR_write, /*fd=*/r[2], /*arg=*/0x400000000480ul, /*len=*/0x18ul);
  NONFAILING(*(uint32_t*)0x400000000600 = 0x50);
  NONFAILING(*(uint32_t*)0x400000000604 = 0);
  NONFAILING(*(uint64_t*)0x400000000608 = 0);
  NONFAILING(*(uint32_t*)0x400000000610 = 7);
  NONFAILING(*(uint32_t*)0x400000000614 = 0x29);
  NONFAILING(*(uint32_t*)0x400000000618 = 3);
  NONFAILING(*(uint32_t*)0x40000000061c = 0);
  NONFAILING(*(uint16_t*)0x400000000620 = 4);
  NONFAILING(*(uint16_t*)0x400000000622 = 0x772);
  NONFAILING(*(uint32_t*)0x400000000624 = 7);
  NONFAILING(*(uint32_t*)0x400000000628 = 0);
  NONFAILING(*(uint16_t*)0x40000000062c = 0);
  NONFAILING(*(uint16_t*)0x40000000062e = 0);
  NONFAILING(*(uint32_t*)0x400000000630 = 0xa0);
  NONFAILING(*(uint32_t*)0x400000000634 = 0x200);
  NONFAILING(memset((void*)0x400000000638, 0, 24));
  syscall(__NR_write, /*fd=*/r[2], /*arg=*/0x400000000600ul, /*len=*/0x50ul);
  NONFAILING(memcpy((void*)0x4000000002c0, "./file0\000", 8));
  NONFAILING(memcpy((void*)0x400000000080, "9p\000", 3));
  NONFAILING(memcpy((void*)0x400000000340, "trans=fd,", 9));
  NONFAILING(memcpy((void*)0x400000000349, "rfdno", 5));
  NONFAILING(*(uint8_t*)0x40000000034e = 0x3d);
  NONFAILING(sprintf((char*)0x40000000034f, "0x%016llx", (long long)r[0]));
  NONFAILING(*(uint8_t*)0x400000000361 = 0x2c);
  NONFAILING(memcpy((void*)0x400000000362, "wfdno", 5));
  NONFAILING(*(uint8_t*)0x400000000367 = 0x3d);
  NONFAILING(sprintf((char*)0x400000000368, "0x%016llx", (long long)r[2]));
  NONFAILING(*(uint8_t*)0x40000000037a = 0x2c);
  NONFAILING(memcpy((void*)0x40000000037b, "access=any", 10));
  NONFAILING(*(uint8_t*)0x400000000385 = 0x2c);
  NONFAILING(memcpy((void*)0x400000000386, "noxattr", 7));
  NONFAILING(*(uint8_t*)0x40000000038d = 0x2c);
  NONFAILING(memcpy((void*)0x40000000038e, "cache=fscache", 13));
  NONFAILING(*(uint8_t*)0x40000000039b = 0x2c);
  NONFAILING(*(uint8_t*)0x40000000039c = 0);
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x4000000002c0ul,
          /*type=*/0x400000000080ul, /*flags=*/0ul, /*opts=*/0x400000000340ul);
  NONFAILING(memcpy((void*)0x40000000c380, "./file0\000", 8));
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x40000000c380ul,
                /*flags=O_NONBLOCK|O_NOFOLLOW|O_CREAT|O_RDWR*/ 0x20842,
                /*mode=*/0);
  if (res != -1)
    r[3] = res;
  syscall(__NR_mmap, /*addr=*/0x400000000000ul, /*len=*/0x1000ul,
          /*prot=PROT_READ*/ 1ul, /*flags=MAP_FIXED|MAP_PRIVATE*/ 0x12ul,
          /*fd=*/r[3], /*offset=*/0x75e7f000ul);
  NONFAILING(*(uint32_t*)0x400000000180 = 0x13);
  NONFAILING(*(uint8_t*)0x400000000184 = 0x65);
  NONFAILING(*(uint16_t*)0x400000000185 = -1);
  NONFAILING(*(uint32_t*)0x400000000187 = 0xffffff77);
  NONFAILING(*(uint16_t*)0x40000000018b = 6);
  NONFAILING(memcpy((void*)0x40000000018d, "9P2000", 6));
  syscall(__NR_write, /*fd=*/r[2], /*data=*/0x400000000180ul, /*size=*/0x13ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x3ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x400000000000ul, /*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=*/0x400001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  loop();
  return 0;
}