// https://syzkaller.appspot.com/bug?id=609c457deb86538d75f2302998ba18478d0c29a8
// 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 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 long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    unsigned long nb = a1;
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(nb % 10);
      nb /= 10;
    }
    return open(buf, a2, 0);
  }
}

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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$nullb arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6e 75 6c 6c 62 30 00} (length 0xc)
  //    }
  //    flags: open_flags = 0x1c3902 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_block
  NONFAILING(memcpy((void*)0x200000000100, "/dev/nullb0\000", 12));
  res = syscall(
      __NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000100ul,
      /*flags=O_SYNC|O_NONBLOCK|O_NOCTTY|O_NOATIME|O_CLOEXEC|0x2002*/ 0x1c3902,
      /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  sendfile arguments: [
  //    fdout: fd (resource)
  //    fdin: fd (resource)
  //    off: nil
  //    count: intptr = 0x200000 (8 bytes)
  //  ]
  syscall(__NR_sendfile, /*fdout=*/r[0], /*fdin=*/r[0], /*off=*/0ul,
          /*count=*/0x200000ul);
  //  prlimit64 arguments: [
  //    pid: pid (resource)
  //    res: rlimit_type = 0xe (8 bytes)
  //    new: nil
  //    old: nil
  //  ]
  syscall(__NR_prlimit64, /*pid=*/0, /*res=RLIMIT_RTPRIO*/ 0xeul, /*new=*/0ul,
          /*old=*/0ul);
  //  getrlimit arguments: [
  //    res: rlimit_type = 0xd (8 bytes)
  //    rlim: nil
  //  ]
  syscall(__NR_getrlimit, /*res=RLIMIT_NICE*/ 0xdul, /*rlim=*/0ul);
  //  sched_setscheduler arguments: [
  //    pid: pid (resource)
  //    policy: sched_policy = 0x2 (8 bytes)
  //    prio: nil
  //  ]
  syscall(__NR_sched_setscheduler, /*pid=*/0, /*policy=SCHED_RR*/ 2ul,
          /*prio=*/0ul);
  //  sched_setaffinity arguments: [
  //    pid: pid (resource)
  //    cpusetsize: len = 0x0 (8 bytes)
  //    mask: nil
  //  ]
  syscall(__NR_sched_setaffinity, /*pid=*/0, /*cpusetsize=*/0ul, /*mask=*/0ul);
  //  prctl$PR_SCHED_CORE arguments: [
  //    option: const = 0x3e (8 bytes)
  //    cmd: intptr = 0x1 (8 bytes)
  //    pid: pid (resource)
  //    type: pid_type = 0x2 (8 bytes)
  //    uaddr: nil
  //  ]
  syscall(__NR_prctl, /*option=*/0x3eul, /*cmd=*/1ul, /*pid=*/0,
          /*type=PIDTYPE_PGID*/ 2ul, /*uaddr=*/0ul);
  //  socket$nl_netfilter arguments: [
  //    domain: const = 0x10 (8 bytes)
  //    type: const = 0x3 (8 bytes)
  //    proto: const = 0xc (4 bytes)
  //  ]
  //  returns sock_nl_netfilter
  syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0xc);
  //  bind$inet6 arguments: [
  //    fd: sock_in6 (resource)
  //    addr: nil
  //    addrlen: len = 0x0 (8 bytes)
  //  ]
  syscall(__NR_bind, /*fd=*/(intptr_t)-1, /*addr=*/0ul, /*addrlen=*/0ul);
  //  syz_open_dev$MSR arguments: [
  //    dev: nil
  //    id: intptr = 0x0 (8 bytes)
  //    flags: const = 0x0 (8 bytes)
  //  ]
  //  returns fd_msr
  NONFAILING(syz_open_dev(/*dev=*/0, /*id=*/0, /*flags=*/0));
  //  bind$inet arguments: [
  //    fd: sock_in (resource)
  //    addr: nil
  //    addrlen: len = 0x0 (8 bytes)
  //  ]
  syscall(__NR_bind, /*fd=*/(intptr_t)-1, /*addr=*/0ul, /*addrlen=*/0ul);
  //  setsockopt$sock_int arguments: [
  //    fd: sock (resource)
  //    level: const = 0x1 (4 bytes)
  //    optname: sockopt_opt_sock_int = 0xf (4 bytes)
  //    optval: nil
  //    optlen: len = 0x0 (8 bytes)
  //  ]
  syscall(__NR_setsockopt, /*fd=*/(intptr_t)-1, /*level=*/1,
          /*optname=SO_REUSEPORT*/ 0xf, /*optval=*/0ul, /*optlen=*/0ul);
  //  openat$nullb arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6e 75 6c 6c 62 30 00} (length 0xc)
  //    }
  //    flags: open_flags = 0x121003 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_block
  NONFAILING(memcpy((void*)0x200000000080, "/dev/nullb0\000", 12));
  res = syscall(
      __NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000080ul,
      /*flags=O_SYNC|O_NOFOLLOW|O_RDWR|O_WRONLY*/ 0x121003, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  //  ioctl$FS_IOC_SETFLAGS arguments: [
  //    fd: fd (resource)
  //    cmd: const = 0x40081271 (4 bytes)
  //    arg: ptr[in, fs_flags] {
  //      fs_flags = 0x4000 (4 bytes)
  //    }
  //  ]
  NONFAILING(*(uint32_t*)0x200000000980 = 0x4000);
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x40081271,
          /*arg=*/0x200000000980ul);
}
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;
}