// https://syzkaller.appspot.com/bug?id=fb57d43626b935f715de8d08ad5ea496fad9bc53
// 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_memfd_create
#define __NR_memfd_create 319
#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 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 void setup_fault()
{
  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)
        exit(1);
    }
  }
}

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[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x200004c0,
         "Y\377\377\000\000\000\000\000K\262\002\200B\351\350\314\336\006\000l"
         "\250\032J\257\262M\272\270_\005U\315<|>\236\354^\016\276\030+-"
         "\233\2113\002\000\246\037+"
         "\263\305\220z5\340\337i\267\237\264QW\311\311\222\003\t\000\000\000"
         "\000\000\262\017\356\276\f8\314\177\000\000\000Z\201\000\000\000\000"
         "\030I\023\361\242x\004\201R\3245R\256\204\315N\367\366\b~\355_M^dQ:"
         "\274\257q\210\031nSF|;]\341A\214\212\230\327|\334LF\r\261\375\277!"
         "\307u\314P\335\023~\211\317\205\312\240%"
         "\306\307\021\000\000\000\000\000\000\000?M9\\\av~\'\331\260\254dya]"
         "8\235\267\v\3639\305{\234!\017/"
         "\270o8\271\215\031\342\312\001y\203\347\ng\207\3313<"
         "u\276\352g\322\004e\362s\336}o#\220\332\234s,r\375:"
         "\313\307\vTmPZJ\254\213\320\300\274RK\313\0368\316\275[N\260\264<"
         "\353\206[\354\217\024\n\203\236&\\\267!\355\240\303,"
         "\220m\017\000\000\000\000\000\000\377\320\263\224\000\000\000\000\000"
         "\000\000\235H\370\377Ro\243W\341\355\216S\256X\223\177\323\271a\344"
         "\340\275\331\365\344e\371\312m\343\003\344\255\325&"
         "A\002\310\251\376\313\207\331\323\214\f\3008T~\304\275\220?"
         "\037\234\2330\031 "
         "\237\321p`\300/"
         "\000u\031\035\254\350%"
         "\267\t\2374\273\211\351\301\201\260\326\367\005\026\271\351\334~\323-"
         "s\346;\224\034^\006\332v;\314D\225sj\340\325\276S\254\345N\352\236yl["
         "[\3165\356\005\234\226\253J^c\367\031\264\330\344\207\235p\352?/"
         "\313\232\2525\'Q\fuG\201\212@\227M=v\376\a\253p\363\223\235\177@"
         "9\300\322\361#\347N\211\370\350+"
         "\241\202\023\262\251\357\245\370\213k\263\236v\222\016\321\037\027Dx["
         "\255\260\235/"
         "\226\3442mO\237h\352\363\024\315\226\211_)\033\342\326\b\224b\257;"
         "\222T\257z\224\237G\373\375|$k\003\327;\232y\356\371W?\263\371\370I."
         "E4\303eWq\372\":$\320\027Q\224\365\345mk\216&\361;#z\357*"
         "\316\231\004\271\220\274\271#-"
         "\215i\256\305\337\023\322K\213\365\f\262x\335\325\264\251^~O<"
         "\022\343\303P|7\251\310\261r0Z\230\207^"
         "\310C\033\226\264lsyF\305\274\377OE\351\3270\347\376p\203\247\241\331"
         "\344\272\222\027\277\340\341\001\267\213\030j\031n\310\377\351\364"
         "\364\317 "
         "a\327_w\017\235F\256\314A-/"
         "\203\253U\325\2778\244O\264\357\310\314H\321=\276\265O\025\307;"
         "Lb\316\032\314\230\350\351e\340\302N\347\327\035\222\207F8\236\367"
         "\335\332W\365X\200\240f\316o\330\177\300\226\bSB\316&\004$"
         "\303\3431U\204\202\360{i\035\002\020\306C\001^\317\223?"
         "w\001\204\240\326\242\020\244\374G\253D\326dGZ\262Cx\033\375D9\027"
         "\346\312uM\343\005)\342[\342j$F1n@\336\n%t.[\255\265\f<"
         "o\333\244\220\304\320I\246\226\241\000\273\335\224\000t/"
         "1YekG\177\275rI\036\2124=\242\351\3701\255\356\365\244\005#"
         "\177\250\037\024\202ih\371?\003Q\365\304\225\231 "
         "\247v~:$"
         "\002O\343\252\360o\353k\'\322q\020\036\224n\327w\261\310G\211\364\214"
         "t\371R\205\0338OE\004\232\330\200\020x\277\n0\b,r\306r\367="
         "\376\301\026\346\356\273:-h\272\213\024\232?\216\003;"
         "\345\004\330\251\232\323E(\177|\255U\257e\207V.i4$6U,R\233\n{"
         "\'\3761\304\2609",
         965);
  res = syscall(__NR_memfd_create, 0x200004c0ul, 5ul);
  if (res != -1)
    r[0] = res;
  syscall(__NR_mmap, 0x20200000ul, 0x400017ul, 3ul, 0x2012ul, r[0], 0ul);
  *(uint64_t*)0x20000000 = 9;
  inject_fault(6);
  syscall(__NR_mbind, 0x20000000ul, 0x600000ul, 0x8003ul, 0x20000000ul, 8ul,
          3ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  setup_fault();
  loop();
  return 0;
}