// https://syzkaller.appspot.com/bug?id=101b7e71f53b37caf00bf159bd293d6d6512242a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.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>

#ifndef __NR_fcntl
#define __NR_fcntl 25
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mount
#define __NR_mount 40
#endif
#ifndef __NR_setns
#define __NR_setns 268
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 208
#endif
#ifndef __NR_socket
#define __NR_socket 198
#endif

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 long syz_create_resource(volatile long val)
{
  return val;
}

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[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$inet_tcp arguments: [
  //    domain: const = 0x2 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_tcp
  res = syscall(__NR_socket, /*domain=*/2ul, /*type=*/1ul, /*proto=*/0);
  if (res != -1)
    r[0] = res;
  //  setsockopt$IPT_SO_SET_REPLACE arguments: [
  //    fd: sock_in (resource)
  //    level: const = 0x0 (4 bytes)
  //    opt: const = 0x40 (4 bytes)
  //    val: ptr[in, ipt_replace] {
  //      union ipt_replace {
  //        filter: ipt_replace_t["filter", 3, 4, IPT_FILTER_VALID_HOOKS,
  //        ipt_filter_matches, ipt_filter_targets, ipt_unused, ipt_hook,
  //        ipt_hook, ipt_hook, ipt_unused, ipt_unused, ipt_hook, ipt_hook,
  //        ipt_hook, ipt_unused] {
  //          name: buffer: {66 69 6c 74 65 72 00 00 00 00 00 00 00 00 00 00 00
  //          00 00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length 0x20)
  //          valid_hooks: const = 0xe (4 bytes)
  //          num_entries: const = 0x4 (4 bytes)
  //          size: bytesize = 0x260 (4 bytes)
  //          hook_pre_routing: const = 0xffffffff (4 bytes)
  //          hook_local_in: const = 0x0 (4 bytes)
  //          hook_forward: const = 0x130 (4 bytes)
  //          hook_local_out: const = 0x1c8 (4 bytes)
  //          hook_post_routing: const = 0xffffffff (4 bytes)
  //          underflow_pre_routing: const = 0xffffffff (4 bytes)
  //          underflow_local_in: const = 0x98 (4 bytes)
  //          underflow_forward: const = 0x130 (4 bytes)
  //          underflow_local_out: const = 0x1c8 (4 bytes)
  //          underflow_post_routing: const = 0xffffffff (4 bytes)
  //          num_counters: const = 0x4 (4 bytes)
  //          counters: nil
  //          entries: ipt_replace_entries[3, ipt_filter_matches,
  //          ipt_filter_targets] {
  //            entries: array[ipt_entry[ipt_filter_matches,
  //            ipt_filter_targets]] {
  //              ipt_entry[ipt_filter_matches, ipt_filter_targets] {
  //                matches: ipt_entry_matches[ipt_filter_matches] {
  //                  ip: union ipt_ip_or_uncond {
  //                    ip: ipt_ip {
  //                      src: union ipv4_addr {
  //                        empty: const = 0x0 (4 bytes)
  //                      }
  //                      dst: union ipv4_addr {
  //                        empty: const = 0x0 (4 bytes)
  //                      }
  //                      smsk: ipv4_addr_mask_vals = 0x0 (4 bytes)
  //                      dmsk: ipv4_addr_mask_vals = 0x0 (4 bytes)
  //                      iniface: buffer: {00 00 00 00 00 00 00 00 00 00 00 00
  //                      00 00 00 00} (length 0x10) outiface: buffer: {00 00 00
  //                      00 00 00 00 00 00 00 00 00 00 00 00 00} (length 0x10)
  //                      iniface_mask: devname_mask {
  //                        lo: devname_mask_values = 0x0 (1 bytes)
  //                        pad = 0x0 (15 bytes)
  //                      }
  //                      outiface_mask: devname_mask {
  //                        lo: devname_mask_values = 0x0 (1 bytes)
  //                        pad = 0x0 (15 bytes)
  //                      }
  //                      proto: ipv4_types = 0x6 (2 bytes)
  //                      flags: ipt_ip_flags = 0x0 (1 bytes)
  //                      invflags: ipt_ip_invflags = 0x0 (1 bytes)
  //                    }
  //                  }
  //                  nfcache: const = 0x0 (4 bytes)
  //                  target_offset: len = 0x70 (2 bytes)
  //                  next_offset: len = 0x98 (2 bytes)
  //                  comefrom: const = 0x0 (4 bytes)
  //                  counters: xt_counters {
  //                    pcnt: const = 0x0 (8 bytes)
  //                    bcnt: const = 0x0 (8 bytes)
  //                  }
  //                  matches: array[ipt_filter_matches] {
  //                  }
  //                }
  //                target: union ipt_filter_targets {
  //                  common: union ipt_targets {
  //                    inet: union xt_inet_targets {
  //                      SYNPROXY: xt_target_t["SYNPROXY", xt_synproxy_info, 0]
  //                      {
  //                        target_size: len = 0x28 (2 bytes)
  //                        name: buffer: {53 59 4e 50 52 4f 58 59 00 00 00 00
  //                        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00}
  //                        (length 0x1d) revision: const = 0x0 (1 bytes) data:
  //                        xt_synproxy_info {
  //                          options: xt_synproxy_options = 0xf (1 bytes)
  //                          wscale: int8 = 0x7 (1 bytes)
  //                          mss: int16 = 0x5b4 (2 bytes)
  //                        }
  //                        pad = 0x0 (4 bytes)
  //                      }
  //                    }
  //                  }
  //                }
  //              }
  //              ipt_entry[ipt_filter_matches, ipt_filter_targets] {
  //                matches: ipt_entry_matches[ipt_filter_matches] {
  //                  ip: union ipt_ip_or_uncond {
  //                    uncond: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length 0x54)
  //                  }
  //                  nfcache: const = 0x0 (4 bytes)
  //                  target_offset: len = 0x70 (2 bytes)
  //                  next_offset: len = 0x98 (2 bytes)
  //                  comefrom: const = 0x0 (4 bytes)
  //                  counters: xt_counters {
  //                    pcnt: const = 0x0 (8 bytes)
  //                    bcnt: const = 0x0 (8 bytes)
  //                  }
  //                  matches: array[ipt_filter_matches] {
  //                  }
  //                }
  //                target: union ipt_filter_targets {
  //                  common: union ipt_targets {
  //                    unspec: union xt_unspec_targets {
  //                      STANDARD: xt_target_t["", flags[nf_verdicts, int32],
  //                      0] {
  //                        target_size: len = 0x28 (2 bytes)
  //                        name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00
  //                        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00}
  //                        (length 0x1d) revision: const = 0x0 (1 bytes) data:
  //                        nf_verdicts = 0xfffffffe (4 bytes) pad = 0x0 (4
  //                        bytes)
  //                      }
  //                    }
  //                  }
  //                }
  //              }
  //              ipt_entry[ipt_filter_matches, ipt_filter_targets] {
  //                matches: ipt_entry_matches[ipt_filter_matches] {
  //                  ip: union ipt_ip_or_uncond {
  //                    uncond: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                    00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length 0x54)
  //                  }
  //                  nfcache: const = 0x0 (4 bytes)
  //                  target_offset: len = 0x70 (2 bytes)
  //                  next_offset: len = 0x98 (2 bytes)
  //                  comefrom: const = 0x0 (4 bytes)
  //                  counters: xt_counters {
  //                    pcnt: const = 0x0 (8 bytes)
  //                    bcnt: const = 0x0 (8 bytes)
  //                  }
  //                  matches: array[ipt_filter_matches] {
  //                  }
  //                }
  //                target: union ipt_filter_targets {
  //                  common: union ipt_targets {
  //                    unspec: union xt_unspec_targets {
  //                      STANDARD: xt_target_t["", flags[nf_verdicts, int32],
  //                      0] {
  //                        target_size: len = 0x28 (2 bytes)
  //                        name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00
  //                        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00}
  //                        (length 0x1d) revision: const = 0x0 (1 bytes) data:
  //                        nf_verdicts = 0xfffffffe (4 bytes) pad = 0x0 (4
  //                        bytes)
  //                      }
  //                    }
  //                  }
  //                }
  //              }
  //            }
  //            underflow: ipt_entry_underflow {
  //              matches: ipt_entry_underflow_matches {
  //                ip: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                00 00 00 00 00 00 00 00} (length 0x54) nfcache: const = 0x0
  //                (4 bytes) target_offset: len = 0x70 (2 bytes) next_offset:
  //                len = 0x98 (2 bytes) comefrom: const = 0x0 (4 bytes)
  //                counters: xt_counters {
  //                  pcnt: const = 0x0 (8 bytes)
  //                  bcnt: const = 0x0 (8 bytes)
  //                }
  //              }
  //              target: xt_target_t["", const[NF_ACCEPT_VERDICT, int32], 0] {
  //                target_size: len = 0x28 (2 bytes)
  //                name: buffer: {00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  //                00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length 0x1d)
  //                revision: const = 0x0 (1 bytes)
  //                data: const = 0xfffffffe (4 bytes)
  //                pad = 0x0 (4 bytes)
  //              }
  //            }
  //          }
  //        }
  //      }
  //    }
  //    len: len = 0x2c0 (8 bytes)
  //  ]
  memcpy((void*)0x20000000,
         "filter\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000\000\000\000\000\000",
         32);
  *(uint32_t*)0x20000020 = 0xe;
  *(uint32_t*)0x20000024 = 4;
  *(uint32_t*)0x20000028 = 0x260;
  *(uint32_t*)0x2000002c = -1;
  *(uint32_t*)0x20000030 = 0;
  *(uint32_t*)0x20000034 = 0x130;
  *(uint32_t*)0x20000038 = 0x1c8;
  *(uint32_t*)0x2000003c = -1;
  *(uint32_t*)0x20000040 = -1;
  *(uint32_t*)0x20000044 = 0x98;
  *(uint32_t*)0x20000048 = 0x130;
  *(uint32_t*)0x2000004c = 0x1c8;
  *(uint32_t*)0x20000050 = -1;
  *(uint32_t*)0x20000054 = 4;
  *(uint64_t*)0x20000058 = 0;
  *(uint32_t*)0x20000060 = htobe32(0);
  *(uint32_t*)0x20000064 = htobe32(0);
  *(uint32_t*)0x20000068 = htobe32(0);
  *(uint32_t*)0x2000006c = htobe32(0);
  memset((void*)0x20000070, 0, 16);
  memset((void*)0x20000080, 0, 16);
  *(uint8_t*)0x20000090 = 0;
  *(uint8_t*)0x200000a0 = 0;
  *(uint16_t*)0x200000b0 = 6;
  *(uint8_t*)0x200000b2 = 0;
  *(uint8_t*)0x200000b3 = 0;
  *(uint32_t*)0x200000b4 = 0;
  *(uint16_t*)0x200000b8 = 0x70;
  *(uint16_t*)0x200000ba = 0x98;
  *(uint32_t*)0x200000bc = 0;
  *(uint64_t*)0x200000c0 = 0;
  *(uint64_t*)0x200000c8 = 0;
  *(uint16_t*)0x200000d0 = 0x28;
  memcpy((void*)0x200000d2,
         "SYNPROXY\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
         "\000\000\000\000\000\000",
         29);
  *(uint8_t*)0x200000ef = 0;
  *(uint8_t*)0x200000f0 = 0xf;
  *(uint8_t*)0x200000f1 = 7;
  *(uint16_t*)0x200000f2 = 0x5b4;
  memset((void*)0x200000f8, 0, 84);
  *(uint32_t*)0x2000014c = 0;
  *(uint16_t*)0x20000150 = 0x70;
  *(uint16_t*)0x20000152 = 0x98;
  *(uint32_t*)0x20000154 = 0;
  *(uint64_t*)0x20000158 = 0;
  *(uint64_t*)0x20000160 = 0;
  *(uint16_t*)0x20000168 = 0x28;
  memset((void*)0x2000016a, 0, 29);
  *(uint8_t*)0x20000187 = 0;
  *(uint32_t*)0x20000188 = 0xfffffffe;
  memset((void*)0x20000190, 0, 84);
  *(uint32_t*)0x200001e4 = 0;
  *(uint16_t*)0x200001e8 = 0x70;
  *(uint16_t*)0x200001ea = 0x98;
  *(uint32_t*)0x200001ec = 0;
  *(uint64_t*)0x200001f0 = 0;
  *(uint64_t*)0x200001f8 = 0;
  *(uint16_t*)0x20000200 = 0x28;
  memset((void*)0x20000202, 0, 29);
  *(uint8_t*)0x2000021f = 0;
  *(uint32_t*)0x20000220 = 0xfffffffe;
  memset((void*)0x20000228, 0, 84);
  *(uint32_t*)0x2000027c = 0;
  *(uint16_t*)0x20000280 = 0x70;
  *(uint16_t*)0x20000282 = 0x98;
  *(uint32_t*)0x20000284 = 0;
  *(uint64_t*)0x20000288 = 0;
  *(uint64_t*)0x20000290 = 0;
  *(uint16_t*)0x20000298 = 0x28;
  memset((void*)0x2000029a, 0, 29);
  *(uint8_t*)0x200002b7 = 0;
  *(uint32_t*)0x200002b8 = 0xfffffffe;
  syscall(__NR_setsockopt, /*fd=*/r[0], /*level=*/0, /*opt=*/0x40,
          /*val=*/0x20000000ul, /*len=*/0x2c0ul);
  //  fcntl$lock arguments: [
  //    fd: fd (resource)
  //    cmd: fcntl_lock = 0x25 (8 bytes)
  //    lock: nil
  //  ]
  syscall(__NR_fcntl, /*fd=*/(intptr_t)-1, /*cmd=F_OFD_SETLK*/ 0x25ul,
          /*lock=*/0ul);
  //  syz_create_resource$binfmt arguments: [
  //    file: nil
  //  ]
  //  returns ptr_binfmt_file
  syz_create_resource(/*file=*/0);
  //  setsockopt$inet6_IPV6_HOPOPTS arguments: [
  //    fd: sock_in6 (resource)
  //    level: const = 0x29 (4 bytes)
  //    optname: const = 0x36 (4 bytes)
  //    optval: nil
  //    optlen: len = 0x8 (8 bytes)
  //  ]
  syscall(__NR_setsockopt, /*fd=*/(intptr_t)-1, /*level=*/0x29,
          /*optname=*/0x36, /*optval=*/0ul, /*optlen=*/8ul);
  //  mount$9p_fd arguments: [
  //    src: const = 0x0 (8 bytes)
  //    dst: nil
  //    type: nil
  //    flags: mount_flags = 0x201820 (8 bytes)
  //    opts: nil
  //  ]
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0ul, /*type=*/0ul,
          /*flags=MS_REMOUNT|MS_RELATIME|MS_NODIRATIME|MS_BIND*/ 0x201820ul,
          /*opts=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*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=*/0x21000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}