// https://syzkaller.appspot.com/bug?id=a1954eed3adfde914df9a0a2d0b7d1ecb876072f
// 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/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>

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;
}

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 setup_sysctl()
{
  int cad_pid = fork();
  if (cad_pid < 0)
    exit(1);
  if (cad_pid == 0) {
    for (;;)
      sleep(100);
  }
  char tmppid[32];
  snprintf(tmppid, sizeof(tmppid), "%d", cad_pid);
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/sys/kernel/debug/failslab/task-filter", "Y"},
      {"/sys/kernel/debug/fail_page_alloc/task-filter", "Y"},
      {"/sys/kernel/debug/fail_futex/task-filter", "Y"},
      {"/sys/kernel/debug/fail_usercopy/task-filter", "Y"},
      {"/sys/kernel/debug/fail_make_request/task-filter", "Y"},
      {"/sys/kernel/debug/fail_io_timeout/task-filter", "Y"},
      {"/sys/kernel/debug/fail_iommufd/task-filter", "Y"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", tmppid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data)) {
    }
  }
  kill(cad_pid, SIGKILL);
  while (waitpid(cad_pid, NULL, 0) != cad_pid)
    ;
}

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)) {
  }
  //  setns arguments: [
  //    fd: fd_namespace (resource)
  //    type: ns_type = 0x0 (8 bytes)
  //  ]
  syscall(__NR_setns, /*fd=*/0xc9, /*type=*/0ul);
  //  socket$nl_xfrm arguments: [
  //    domain: const = 0x10 (8 bytes)
  //    type: const = 0x3 (8 bytes)
  //    proto: const = 0x6 (4 bytes)
  //  ]
  //  returns sock_nl_xfrm
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/6);
  if (res != -1)
    r[0] = res;
  //  sendmsg$nl_xfrm arguments: [
  //    fd: sock_nl_xfrm (resource)
  //    msg: ptr[in, msghdr_netlink[netlink_msg_xfrm]] {
  //      msghdr_netlink[netlink_msg_xfrm] {
  //        addr: nil
  //        addrlen: len = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        vec: ptr[in, iovec[in, netlink_msg_xfrm]] {
  //          iovec[in, netlink_msg_xfrm] {
  //            addr: ptr[in, netlink_msg_xfrm] {
  //              union netlink_msg_xfrm {
  //                updpolicy: netlink_msg_t[const[XFRM_MSG_UPDPOLICY, int16],
  //                xfrm_userpolicy_info, xfrma_policy] {
  //                  len: len = 0xfc (4 bytes)
  //                  type: const = 0x19 (2 bytes)
  //                  flags: netlink_msg_flags = 0x1 (2 bytes)
  //                  seq: int32 = 0x0 (4 bytes)
  //                  pid: int32 = 0x0 (4 bytes)
  //                  payload: xfrm_userpolicy_info {
  //                    sel: xfrm_selector {
  //                      daddr: union xfrm_address_t {
  //                        in: union ipv4_addr {
  //                          rand_addr: int32be = 0x0 (4 bytes)
  //                        }
  //                      }
  //                      saddr: union xfrm_address_t {
  //                        in6: union ipv6_addr {
  //                          ipv4: ipv6_addr_ipv4 {
  //                            a0: buffer: {00 00 00 00 00 00 00 00 00 00}
  //                            (length 0xa) a1: buffer: {ff ff} (length 0x2)
  //                            a3: union ipv4_addr {
  //                              multicast1: const = 0xe0000001 (4 bytes)
  //                            }
  //                          }
  //                        }
  //                      }
  //                      dport: int16be = 0x0 (2 bytes)
  //                      dport_mask: int16be = 0x0 (2 bytes)
  //                      sport: int16be = 0x0 (2 bytes)
  //                      sport_mask: int16be = 0x0 (2 bytes)
  //                      family: xfrm_family = 0x2 (2 bytes)
  //                      prefixlen_d: xfrm_prefixlens = 0x0 (1 bytes)
  //                      prefixlen_s: xfrm_prefixlens = 0x0 (1 bytes)
  //                      proto: ipv6_types = 0x0 (1 bytes)
  //                      pad = 0x0 (3 bytes)
  //                      ifindex: ifindex (resource)
  //                      user: uid (resource)
  //                    }
  //                    lft: xfrm_lifetime_cfg {
  //                      soft_byte_limit: int64 = 0x0 (8 bytes)
  //                      hard_byte_limit: int64 = 0x7 (8 bytes)
  //                      soft_packet_limit: int64 = 0x0 (8 bytes)
  //                      hard_packet_limit: int64 = 0x7fffffff (8 bytes)
  //                      soft_add_expires_seconds: int64 = 0x0 (8 bytes)
  //                      hard_add_expires_seconds: int64 = 0x2 (8 bytes)
  //                      soft_use_expires_seconds: int64 = 0x0 (8 bytes)
  //                      hard_use_expires_seconds: int64 = 0x0 (8 bytes)
  //                    }
  //                    curlft: xfrm_lifetime_cur {
  //                      bytes: int64 = 0xfffffffffffffffe (8 bytes)
  //                      packets: int64 = 0xffffffffffffffff (8 bytes)
  //                      add_time: int64 = 0x0 (8 bytes)
  //                      use_time: int64 = 0x0 (8 bytes)
  //                    }
  //                    priority: int32 = 0x0 (4 bytes)
  //                    index: int32 = 0x0 (4 bytes)
  //                    dir: xfrm_policy_dir = 0x1 (1 bytes)
  //                    action: xfrm_policy_actions = 0x0 (1 bytes)
  //                    flags: xfrm_policy_flags = 0x0 (1 bytes)
  //                    share: xfrm_policy_shares = 0x3 (1 bytes)
  //                    pad = 0x0 (4 bytes)
  //                  }
  //                  attrs: array[xfrma_policy] {
  //                    union xfrma_policy {
  //                      tmpl: nlattr_t[const[XFRMA_TMPL, int16],
  //                      array[xfrm_user_tmpl, 1:XFRM_MAX_DEPTH]] {
  //                        nla_len: offsetof = 0x44 (2 bytes)
  //                        nla_type: const = 0x5 (2 bytes)
  //                        payload: array[xfrm_user_tmpl] {
  //                          xfrm_user_tmpl {
  //                            id: xfrm_id {
  //                              daddr: union xfrm_address_t {
  //                                in6: union ipv6_addr {
  //                                  rand_addr: buffer: {20 01 00 00 00 00 00
  //                                  00 00 00 00 00 00 00 00 00} (length 0x10)
  //                                }
  //                              }
  //                              spi: int32be = 0x2 (4 bytes)
  //                              proto: xfrm_proto = 0x2b (1 bytes)
  //                              pad = 0x0 (3 bytes)
  //                            }
  //                            family: xfrm_family = 0xa (2 bytes)
  //                            pad = 0x0 (2 bytes)
  //                            saddr: union xfrm_address_t {
  //                              in6: union ipv6_addr {
  //                                remote: ipv6_addr_t[const[0xbb, int8]] {
  //                                  a0: const = 0xfe (1 bytes)
  //                                  a1: const = 0x80 (1 bytes)
  //                                  a2: buffer: {00 00 00 00 00 00 00 00 00 00
  //                                  00 00 00} (length 0xd) a3: const = 0xbb (1
  //                                  bytes)
  //                                }
  //                              }
  //                            }
  //                            reqid: int32 = 0x0 (4 bytes)
  //                            mode: xfrm_mode = 0x4 (1 bytes)
  //                            share: xfrm_policy_shares = 0x2 (1 bytes)
  //                            optional: int8 = 0x0 (1 bytes)
  //                            pad = 0x0 (1 bytes)
  //                            aalgos: int32 = 0x0 (4 bytes)
  //                            ealgos: int32 = 0x0 (4 bytes)
  //                            calgos: int32 = 0x4000 (4 bytes)
  //                          }
  //                        }
  //                        size: buffer: {} (length 0x0)
  //                      }
  //                    }
  //                  }
  //                }
  //              }
  //            }
  //            len: len = 0xfc (8 bytes)
  //          }
  //        }
  //        vlen: const = 0x1 (8 bytes)
  //        ctrl: const = 0x0 (8 bytes)
  //        ctrllen: const = 0x0 (8 bytes)
  //        f: send_flags = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: send_flags = 0x0 (8 bytes)
  //  ]
  NONFAILING(*(uint64_t*)0x200000000480 = 0);
  NONFAILING(*(uint32_t*)0x200000000488 = 0);
  NONFAILING(*(uint64_t*)0x200000000490 = 0x2000000000c0);
  NONFAILING(*(uint64_t*)0x2000000000c0 = 0x200000000840);
  NONFAILING(*(uint32_t*)0x200000000840 = 0xfc);
  NONFAILING(*(uint16_t*)0x200000000844 = 0x19);
  NONFAILING(*(uint16_t*)0x200000000846 = 1);
  NONFAILING(*(uint32_t*)0x200000000848 = 0);
  NONFAILING(*(uint32_t*)0x20000000084c = 0);
  NONFAILING(*(uint32_t*)0x200000000850 = htobe32(0));
  NONFAILING(memset((void*)0x200000000860, 0, 10));
  NONFAILING(memset((void*)0x20000000086a, 255, 2));
  NONFAILING(*(uint32_t*)0x20000000086c = htobe32(0xe0000001));
  NONFAILING(*(uint16_t*)0x200000000870 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200000000872 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200000000874 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200000000876 = htobe16(0));
  NONFAILING(*(uint16_t*)0x200000000878 = 2);
  NONFAILING(*(uint8_t*)0x20000000087a = 0);
  NONFAILING(*(uint8_t*)0x20000000087b = 0);
  NONFAILING(*(uint8_t*)0x20000000087c = 0);
  NONFAILING(*(uint32_t*)0x200000000880 = 0);
  NONFAILING(*(uint32_t*)0x200000000884 = 0);
  NONFAILING(*(uint64_t*)0x200000000888 = 0);
  NONFAILING(*(uint64_t*)0x200000000890 = 7);
  NONFAILING(*(uint64_t*)0x200000000898 = 0);
  NONFAILING(*(uint64_t*)0x2000000008a0 = 0x7fffffff);
  NONFAILING(*(uint64_t*)0x2000000008a8 = 0);
  NONFAILING(*(uint64_t*)0x2000000008b0 = 2);
  NONFAILING(*(uint64_t*)0x2000000008b8 = 0);
  NONFAILING(*(uint64_t*)0x2000000008c0 = 0);
  NONFAILING(*(uint64_t*)0x2000000008c8 = 0xfffffffffffffffe);
  NONFAILING(*(uint64_t*)0x2000000008d0 = -1);
  NONFAILING(*(uint64_t*)0x2000000008d8 = 0);
  NONFAILING(*(uint64_t*)0x2000000008e0 = 0);
  NONFAILING(*(uint32_t*)0x2000000008e8 = 0);
  NONFAILING(*(uint32_t*)0x2000000008ec = 0);
  NONFAILING(*(uint8_t*)0x2000000008f0 = 1);
  NONFAILING(*(uint8_t*)0x2000000008f1 = 0);
  NONFAILING(*(uint8_t*)0x2000000008f2 = 0);
  NONFAILING(*(uint8_t*)0x2000000008f3 = 3);
  NONFAILING(*(uint16_t*)0x2000000008f8 = 0x44);
  NONFAILING(*(uint16_t*)0x2000000008fa = 5);
  NONFAILING(memcpy(
      (void*)0x2000000008fc,
      " \001\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 16));
  NONFAILING(*(uint32_t*)0x20000000090c = htobe32(2));
  NONFAILING(*(uint8_t*)0x200000000910 = 0x2b);
  NONFAILING(*(uint16_t*)0x200000000914 = 0xa);
  NONFAILING(*(uint8_t*)0x200000000918 = 0xfe);
  NONFAILING(*(uint8_t*)0x200000000919 = 0x80);
  NONFAILING(memset((void*)0x20000000091a, 0, 13));
  NONFAILING(*(uint8_t*)0x200000000927 = 0xbb);
  NONFAILING(*(uint32_t*)0x200000000928 = 0);
  NONFAILING(*(uint8_t*)0x20000000092c = 4);
  NONFAILING(*(uint8_t*)0x20000000092d = 2);
  NONFAILING(*(uint8_t*)0x20000000092e = 0);
  NONFAILING(*(uint32_t*)0x200000000930 = 0);
  NONFAILING(*(uint32_t*)0x200000000934 = 0);
  NONFAILING(*(uint32_t*)0x200000000938 = 0x4000);
  NONFAILING(*(uint64_t*)0x2000000000c8 = 0xfc);
  NONFAILING(*(uint64_t*)0x200000000498 = 1);
  NONFAILING(*(uint64_t*)0x2000000004a0 = 0);
  NONFAILING(*(uint64_t*)0x2000000004a8 = 0);
  NONFAILING(*(uint32_t*)0x2000000004b0 = 0);
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200000000480ul, /*f=*/0ul);
}
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);
  setup_sysctl();
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}