// https://syzkaller.appspot.com/bug?id=780c368310e332c6e13e5a1ac3eb7b5d0d3a4aa4
// 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/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 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 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 {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

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 const char* setup_fault()
{
  int fd = open("/proc/self/make-it-fail", O_WRONLY);
  if (fd == -1)
    return "CONFIG_FAULT_INJECTION is not enabled";
  close(fd);
  fd = open("/proc/thread-self/fail-nth", O_WRONLY);
  if (fd == -1)
    return "kernel does not have systematic fault injection support";
  close(fd);
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        return "failed to write fault injection file";
    }
  }
  return NULL;
}

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)) {
  }
  *(uint32_t*)0x200000c0 = 0;
  *(uint32_t*)0x200000c4 = 0xc;
  *(uint64_t*)0x200000c8 = 0x20000180;
  *(uint8_t*)0x20000180 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000181, 0, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000181, 0, 4, 4);
  *(uint16_t*)0x20000182 = 0;
  *(uint32_t*)0x20000184 = 8;
  *(uint8_t*)0x20000188 = 0;
  *(uint8_t*)0x20000189 = 0;
  *(uint16_t*)0x2000018a = 0;
  *(uint32_t*)0x2000018c = 0;
  *(uint8_t*)0x20000190 = 0x85;
  *(uint8_t*)0x20000191 = 0;
  *(uint16_t*)0x20000192 = 0;
  *(uint32_t*)0x20000194 = 0x23;
  *(uint8_t*)0x20000198 = 0x18;
  STORE_BY_BITMASK(uint8_t, , 0x20000199, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x20000199, 0, 4, 4);
  *(uint16_t*)0x2000019a = 0;
  *(uint32_t*)0x2000019c = 0x25752020;
  *(uint8_t*)0x200001a0 = 0;
  *(uint8_t*)0x200001a1 = 0;
  *(uint16_t*)0x200001a2 = 0;
  *(uint32_t*)0x200001a4 = 0x20202000;
  STORE_BY_BITMASK(uint8_t, , 0x200001a8, 3, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001a8, 3, 3, 2);
  STORE_BY_BITMASK(uint8_t, , 0x200001a8, 3, 5, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001a9, 0xa, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001a9, 1, 4, 4);
  *(uint16_t*)0x200001aa = 0xfff8;
  *(uint32_t*)0x200001ac = 0;
  STORE_BY_BITMASK(uint8_t, , 0x200001b0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001b0, 1, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x200001b0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001b1, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001b1, 0xa, 4, 4);
  *(uint16_t*)0x200001b2 = 0;
  *(uint32_t*)0x200001b4 = 0;
  STORE_BY_BITMASK(uint8_t, , 0x200001b8, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001b8, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x200001b8, 0, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001b9, 1, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001b9, 0, 4, 4);
  *(uint16_t*)0x200001ba = 0;
  *(uint32_t*)0x200001bc = 0xfffffff8;
  STORE_BY_BITMASK(uint8_t, , 0x200001c0, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001c0, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x200001c0, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001c1, 2, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 4, 4);
  *(uint16_t*)0x200001c2 = 0;
  *(uint32_t*)0x200001c4 = 8;
  STORE_BY_BITMASK(uint8_t, , 0x200001c8, 7, 0, 3);
  STORE_BY_BITMASK(uint8_t, , 0x200001c8, 0, 3, 1);
  STORE_BY_BITMASK(uint8_t, , 0x200001c8, 0xb, 4, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001c9, 3, 0, 4);
  STORE_BY_BITMASK(uint8_t, , 0x200001c9, 0, 4, 4);
  *(uint16_t*)0x200001ca = 0;
  *(uint32_t*)0x200001cc = 5;
  *(uint8_t*)0x200001d0 = 0x85;
  *(uint8_t*)0x200001d1 = 0;
  *(uint16_t*)0x200001d2 = 0;
  *(uint32_t*)0x200001d4 = 0x2d;
  *(uint8_t*)0x200001d8 = 0x95;
  *(uint8_t*)0x200001d9 = 0;
  *(uint16_t*)0x200001da = 0;
  *(uint32_t*)0x200001dc = 0;
  *(uint64_t*)0x200000d0 = 0;
  *(uint32_t*)0x200000d8 = 0;
  *(uint32_t*)0x200000dc = 0;
  *(uint64_t*)0x200000e0 = 0;
  *(uint32_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000ec = 0;
  memset((void*)0x200000f0, 0, 16);
  *(uint32_t*)0x20000100 = 0;
  *(uint32_t*)0x20000104 = 0;
  *(uint32_t*)0x20000108 = -1;
  *(uint32_t*)0x2000010c = 0;
  *(uint64_t*)0x20000110 = 0;
  *(uint32_t*)0x20000118 = 0;
  *(uint32_t*)0x2000011c = 0;
  *(uint64_t*)0x20000120 = 0;
  *(uint32_t*)0x20000128 = 0;
  *(uint32_t*)0x2000012c = 0;
  *(uint32_t*)0x20000130 = -1;
  *(uint32_t*)0x20000134 = 0;
  *(uint64_t*)0x20000138 = 0;
  *(uint64_t*)0x20000140 = 0;
  *(uint32_t*)0x20000148 = 0;
  *(uint32_t*)0x2000014c = 0;
  *(uint32_t*)0x20000150 = 0;
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x94ul);
  *(uint32_t*)0x200000c0 = 0x11;
  *(uint32_t*)0x200000c4 = 0xc;
  *(uint64_t*)0x200000c8 = 0x20000180;
  *(uint64_t*)0x200000d0 = 0x20000240;
  memcpy((void*)0x20000240, "GPL\000", 4);
  *(uint32_t*)0x200000d8 = 0;
  *(uint32_t*)0x200000dc = 0;
  *(uint64_t*)0x200000e0 = 0;
  *(uint32_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000ec = 0;
  memset((void*)0x200000f0, 0, 16);
  *(uint32_t*)0x20000100 = 0;
  *(uint32_t*)0x20000104 = 0;
  *(uint32_t*)0x20000108 = -1;
  *(uint32_t*)0x2000010c = 0;
  *(uint64_t*)0x20000110 = 0;
  *(uint32_t*)0x20000118 = 0;
  *(uint32_t*)0x2000011c = 0;
  *(uint64_t*)0x20000120 = 0;
  *(uint32_t*)0x20000128 = 0;
  *(uint32_t*)0x2000012c = 0;
  *(uint32_t*)0x20000130 = 0;
  *(uint32_t*)0x20000134 = 0;
  *(uint64_t*)0x20000138 = 0;
  *(uint64_t*)0x20000140 = 0;
  *(uint32_t*)0x20000148 = 0;
  *(uint32_t*)0x2000014c = 0;
  *(uint32_t*)0x20000150 = 0;
  res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul);
  if (res != -1)
    r[0] = res;
  *(uint64_t*)0x200002c0 = 0x20000280;
  memcpy((void*)0x20000280, "timer_start\000", 12);
  *(uint32_t*)0x200002c8 = r[0];
  *(uint32_t*)0x200002cc = 0;
  *(uint64_t*)0x200002d0 = 0;
  syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200002c0ul, /*size=*/0x10ul);
  res = -1;
  res = syz_open_dev(/*dev=*/0xc, /*major=*/4, /*minor=*/1);
  if (res != -1)
    r[1] = res;
  res = syscall(__NR_dup, /*oldfd=*/r[1]);
  if (res != -1)
    r[2] = res;
  inject_fault(3);
  syscall(__NR_write, /*fd=*/r[2], /*data=*/0ul, /*len=*/0ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_fault()))
    printf("the reproducer may not work as expected: fault injection setup "
           "failed: %s\n",
           reason);
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}