// https://syzkaller.appspot.com/bug?id=acd7212b960a1331bf9693018a9d66661bca8cd6
// 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;
}

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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      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;
  NONFAILING(*(uint32_t*)0x20000340 = 2);
  NONFAILING(*(uint32_t*)0x20000344 = 4);
  NONFAILING(*(uint32_t*)0x20000348 = 8);
  NONFAILING(*(uint32_t*)0x2000034c = 1);
  NONFAILING(*(uint32_t*)0x20000350 = 0x80);
  NONFAILING(*(uint32_t*)0x20000354 = 0);
  NONFAILING(*(uint32_t*)0x20000358 = 0);
  NONFAILING(memset((void*)0x2000035c, 0, 16));
  NONFAILING(*(uint32_t*)0x2000036c = 0);
  NONFAILING(*(uint32_t*)0x20000370 = -1);
  NONFAILING(*(uint32_t*)0x20000374 = 0);
  NONFAILING(*(uint32_t*)0x20000378 = 0);
  NONFAILING(*(uint32_t*)0x2000037c = 0);
  NONFAILING(*(uint64_t*)0x20000380 = 0);
  res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x20000340ul, /*size=*/0x48ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x200004c0 = 6);
  NONFAILING(*(uint32_t*)0x200004c4 = 0x10);
  NONFAILING(*(uint64_t*)0x200004c8 = 0x200003c0);
  NONFAILING(
      memcpy((void*)0x200003c0,
             "\x18\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
             "\xb7\x08\x00\x00\x00\x00\x00\x00\x7b\x8a\xf8\xff\x00\x00\x00\x00"
             "\xb7\x08\x00\x00\x00\x00\x00\x00\x7b\x8a\xf0\xff\x00\x00\x00\x00"
             "\xbf\xa1\x00\x00\x00\x00\x00\x00\x07\x01\x00\x00\xf8\xff\xff\xff"
             "\xbf\xa4\x00\x00\x00\x00\x00\x00\x07\x04\x00\x00\xf0\xff\xff\xff"
             "\xb7\x02\x00\x00\x08\x00\x00\x00\x18\x23\x00\x00",
             92));
  NONFAILING(*(uint32_t*)0x2000041c = r[0]);
  NONFAILING(memcpy(
      (void*)0x20000420,
      "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x04\x00\x00\x08\x00\x00\x00\x85\x00"
      "\x00\x00\x1c\x00\x00\x00\x95\x00\x00\x00\x00\x00\x00\x00\xc6\xc8\xb6\x18"
      "\x7d\x01\x6c\x9d\xf0\x41\x83\x16\xc9\x4d\x71\x28\x84\x59\x6b\x31\x83\xfc"
      "\xd2\xff\x8c\xa1\x77\x30\xc6\x99\xbe\x74\x43\xef\xed\x35\x76\xb4\xa6\xb8"
      "\xfe\xb9\x3a\x4a\x98\x03\x31\xde\xbc\x2e\x40\xd7\x56\x93\x26\x75\x5b\xcc"
      "\x3e\xaa\x98\x62\x20\x91\x80\x7b\x75\xc4\x1d\xe1\xa0\x01\x6d\xcf\x1a",
      107));
  NONFAILING(*(uint64_t*)0x200004d0 = 0x20000000);
  NONFAILING(memcpy((void*)0x20000000, "syzkaller\000", 10));
  NONFAILING(*(uint32_t*)0x200004d8 = 0);
  NONFAILING(*(uint32_t*)0x200004dc = 0);
  NONFAILING(*(uint64_t*)0x200004e0 = 0);
  NONFAILING(*(uint32_t*)0x200004e8 = 0);
  NONFAILING(*(uint32_t*)0x200004ec = 0);
  NONFAILING(memset((void*)0x200004f0, 0, 16));
  NONFAILING(*(uint32_t*)0x20000500 = 0);
  NONFAILING(*(uint32_t*)0x20000504 = 0);
  NONFAILING(*(uint32_t*)0x20000508 = 0);
  NONFAILING(*(uint32_t*)0x2000050c = 0);
  NONFAILING(*(uint64_t*)0x20000510 = 0);
  NONFAILING(*(uint32_t*)0x20000518 = 0);
  NONFAILING(*(uint32_t*)0x2000051c = 0);
  NONFAILING(*(uint64_t*)0x20000520 = 0);
  NONFAILING(*(uint32_t*)0x20000528 = 0);
  NONFAILING(*(uint32_t*)0x2000052c = 0);
  NONFAILING(*(uint32_t*)0x20000530 = 0);
  NONFAILING(*(uint32_t*)0x20000534 = 0);
  NONFAILING(*(uint64_t*)0x20000538 = 0);
  NONFAILING(*(uint64_t*)0x20000540 = 0);
  NONFAILING(*(uint32_t*)0x20000548 = 0);
  NONFAILING(*(uint32_t*)0x2000054c = 0);
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200004c0ul, /*size=*/0x90ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint32_t*)0x20000740 = r[1]);
  NONFAILING(*(uint32_t*)0x20000744 = 0);
  NONFAILING(*(uint32_t*)0x20000748 = 0);
  NONFAILING(*(uint32_t*)0x2000074c = 0);
  NONFAILING(*(uint64_t*)0x20000750 = 0);
  NONFAILING(*(uint64_t*)0x20000758 = 0);
  NONFAILING(*(uint32_t*)0x20000760 = 0x2300);
  NONFAILING(*(uint32_t*)0x20000764 = 0);
  NONFAILING(*(uint32_t*)0x20000768 = 0);
  NONFAILING(*(uint32_t*)0x2000076c = 0);
  NONFAILING(*(uint64_t*)0x20000770 = 0);
  NONFAILING(*(uint64_t*)0x20000778 = 0);
  NONFAILING(*(uint32_t*)0x20000780 = 0);
  NONFAILING(*(uint32_t*)0x20000784 = 0);
  NONFAILING(*(uint32_t*)0x20000788 = 0);
  syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x20000740ul, /*size=*/0x50ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}