// https://syzkaller.appspot.com/bug?id=d4463a2d3563cdc5823b22d4e115144d0af7e88c
// 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>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

static unsigned long long procid;

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;
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0x10);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint64_t*)0x200000000000 = 0);
  NONFAILING(*(uint32_t*)0x200000000008 = 0);
  NONFAILING(*(uint64_t*)0x200000000010 = 0x200000000040);
  NONFAILING(*(uint64_t*)0x200000000040 = 0x200000000100);
  NONFAILING(memcpy(
      (void*)0x200000000100,
      "\x14\x00\x00\x00\x25\x00\x01\x00\x20\x00\x00\x00\x00\x40\x00\x00\x06\x00"
      "\x00\x00\x04\x0d\x68\xc6\xf5\x21\x34\xca\x61\xc2\x78\x97\x4c\x4d\x9d\x3f"
      "\x6f\x92\x13\x4a\x05\x99\xd4\x83\x34\x8b\xad\x34\x1d\x9f\x01\xf3\x67\x30"
      "\xa4\x4f\x54\x0f\x93\x5b\xc8\x6c\xa5\x85\x0e\x5b\x2d\xa3\xee\x07\xd6\x75"
      "\x88\xbd\x34\x02\x39\x84\x8e\x01\xca\x8a\xa5\xbc\x04\xc9\x2a\x40\x52\x6b"
      "\x73\xf9\x9d\xe0\x6d\xac\x1d\x93\x96\x6d\xe4\x99\x80\x54\x88\x99\xc7\x39"
      "\x44\x5a\x32\x24\xfd\x42\x09\x7a\x3e\x75\x39\xbb\x00\x52\x45\xf5\x40\xcd"
      "\x9a\x70\xb1\x4c\x8b\xa5\x0e\xfa\x70\xb8\x31\x37\xd3\xda\x58\x32\xb1\x6a"
      "\x81\xf1\xb8\x5a\x41\x77\x5b\xac\x5a\xe1\xe0\xee\x13\x82\x40\x47\x44\x11"
      "\x92\xa7\xd8\xf7\xa6\xeb\x92\x7c\x7a\xfc\x87\x37\x86\xe1\xb7\xcb\x32\x26"
      "\x6e\x05\x74\x20\xc8\x26\x09\x1c\xc3\x90\x0e\x10\x71\x36\xc8\x96\x19\x9c"
      "\x6e\xfb\x69\x45\x4e\xe7\x86\x31\x93\x3f\x9f\xd6\xf3\xd0\xa3\xdf\x35\x25"
      "\xeb\x7b\xad\xa5\xf1\xfb\x6b\x95\xed\x3f\x69\x4c\xbb\x8a\xb3\xb4\x3f\x8e"
      "\xdd\xa2\x1c\xa8\xe8\xe0\x79\x8a\x29\xda\x90\xa8\x1b\x12\xa9\xf4\xa2\x78"
      "\x1a\x86\xd5\xbc\x8c\x12\xfb\x7f\xdf\x4d\xd4\x38\xbd\xd8\x1c\x63\xdd\x9b"
      "\x8a\xf3\x8c\x1f\xb4\x5f\x22\x4a\x27\xd1\xb2\xac\xb2\xb1\xfd\xb8\x3c\x46"
      "\x0d\xd4\x8f\x8c\xf5\x9d\xfa\x29\xf8\x70\xfd\xec\xce\x1a\xd9\xed\xa0\x43"
      "\xd7\xe7\xbb\x01\xb4\x12\x7f\x70\x84\x1d\x01\xf9\x75\xfa\xa6\x9b\xee\x9b"
      "\x36\x00\xa7\x49\x3b\xce\xeb\x17\xa4\xbe\xd3\x0a\xbf\x18\x9a\xf7\xe3\x3f"
      "\x00\x9f\x53\xb1\x33\xf3\x37\xa9\x41\xf9\xcd\x23\xb3\x9f\xe1",
      357));
  NONFAILING(*(uint64_t*)0x200000000048 = 0x14);
  NONFAILING(*(uint64_t*)0x200000000018 = 1);
  NONFAILING(*(uint64_t*)0x200000000020 = 0);
  NONFAILING(*(uint64_t*)0x200000000028 = 0);
  NONFAILING(*(uint32_t*)0x200000000030 = 0x200000c0);
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200000000000ul,
          /*f=MSG_BATCH|MSG_PROBE|MSG_EOR*/ 0x40090ul);
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint32_t*)0x200000000280 = 6);
  NONFAILING(*(uint32_t*)0x200000000284 = 3);
  NONFAILING(*(uint64_t*)0x200000000288 = 0x2000000003c0);
  NONFAILING(memcpy(
      (void*)0x2000000003c0,
      "\x18\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf1\x95",
      17));
  NONFAILING(*(uint64_t*)0x200000000290 = 0x200000000140);
  NONFAILING(memcpy((void*)0x200000000140, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x200000000298 = 0);
  NONFAILING(*(uint32_t*)0x20000000029c = 0);
  NONFAILING(*(uint64_t*)0x2000000002a0 = 0);
  NONFAILING(*(uint32_t*)0x2000000002a8 = 0x41100);
  NONFAILING(*(uint32_t*)0x2000000002ac = 0);
  NONFAILING(memset((void*)0x2000000002b0, 0, 16));
  NONFAILING(*(uint32_t*)0x2000000002c0 = 0);
  NONFAILING(*(uint32_t*)0x2000000002c4 = 0x1b);
  NONFAILING(*(uint32_t*)0x2000000002c8 = -1);
  NONFAILING(*(uint32_t*)0x2000000002cc = 8);
  NONFAILING(*(uint64_t*)0x2000000002d0 = 0);
  NONFAILING(*(uint32_t*)0x2000000002d8 = 0);
  NONFAILING(*(uint32_t*)0x2000000002dc = 0x10);
  NONFAILING(*(uint64_t*)0x2000000002e0 = 0);
  NONFAILING(*(uint32_t*)0x2000000002e8 = 0);
  NONFAILING(*(uint32_t*)0x2000000002ec = 0);
  NONFAILING(*(uint32_t*)0x2000000002f0 = 0);
  NONFAILING(*(uint32_t*)0x2000000002f4 = 0);
  NONFAILING(*(uint64_t*)0x2000000002f8 = 0);
  NONFAILING(*(uint64_t*)0x200000000300 = 0);
  NONFAILING(*(uint32_t*)0x200000000308 = 0x10);
  NONFAILING(*(uint32_t*)0x20000000030c = 0);
  NONFAILING(*(uint32_t*)0x200000000310 = 0);
  res =
      syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000280ul, /*size=*/0x94ul);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint64_t*)0x200000000140 = 0);
  NONFAILING(*(uint32_t*)0x200000000148 = 0);
  NONFAILING(*(uint64_t*)0x200000000150 = 0x200000000080);
  NONFAILING(*(uint64_t*)0x200000000080 = 0x2000000000c0);
  NONFAILING(*(uint32_t*)0x2000000000c0 = 0x3c);
  NONFAILING(*(uint16_t*)0x2000000000c4 = 0x10);
  NONFAILING(*(uint16_t*)0x2000000000c6 = 0x801);
  NONFAILING(*(uint32_t*)0x2000000000c8 = 0);
  NONFAILING(*(uint32_t*)0x2000000000cc = 0);
  NONFAILING(*(uint8_t*)0x2000000000d0 = 0);
  NONFAILING(*(uint8_t*)0x2000000000d1 = 0);
  NONFAILING(*(uint16_t*)0x2000000000d2 = 0);
  NONFAILING(*(uint32_t*)0x2000000000d4 = 0);
  NONFAILING(*(uint32_t*)0x2000000000d8 = 0);
  NONFAILING(*(uint32_t*)0x2000000000dc = 0);
  NONFAILING(*(uint16_t*)0x2000000000e0 = 0xc);
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x2000000000e2, 0x2b, 0, 14));
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x2000000000e3, 0, 6, 1));
  NONFAILING(STORE_BY_BITMASK(uint16_t, , 0x2000000000e3, 1, 7, 1));
  NONFAILING(*(uint16_t*)0x2000000000e4 = 8);
  NONFAILING(*(uint16_t*)0x2000000000e6 = 1);
  NONFAILING(*(uint32_t*)0x2000000000e8 = r[2]);
  NONFAILING(*(uint16_t*)0x2000000000ec = 8);
  NONFAILING(*(uint16_t*)0x2000000000ee = 0x1b);
  NONFAILING(*(uint32_t*)0x2000000000f0 = 0);
  NONFAILING(*(uint16_t*)0x2000000000f4 = 8);
  NONFAILING(*(uint16_t*)0x2000000000f6 = 0xa);
  NONFAILING(*(uint32_t*)0x2000000000f8 = 0);
  NONFAILING(*(uint64_t*)0x200000000088 = 0x3c);
  NONFAILING(*(uint64_t*)0x200000000158 = 1);
  NONFAILING(*(uint64_t*)0x200000000160 = 0);
  NONFAILING(*(uint64_t*)0x200000000168 = 0);
  NONFAILING(*(uint32_t*)0x200000000170 = 0);
  syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x200000000140ul, /*f=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*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=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}