syzkaller-repros/linux/b9e6b08f64a4a43b3c7ee88b1cb77de0b7b42e58.c

// BUG: corrupted list in locks_delete_block
// https://syzkaller.appspot.com/bug?id=b9e6b08f64a4a43b3c7ee88b1cb77de0b7b42e58
// status:dup
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

#include <linux/futex.h>

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 void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (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) {
  }
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  for (call = 0; call < 8; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      reset_test();
      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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    memcpy((void*)0x20fd5ff8, "./file0", 8);
    syscall(__NR_mkdir, 0x20fd5ff8, 0);
    break;
  case 1:
    memcpy((void*)0x20027000, "./file0", 8);
    memcpy((void*)0x20018ffa, "ramfs", 6);
    syscall(__NR_mount, 0x200000c0, 0x20027000, 0x20018ffa, 0x50, 0x2000a000);
    break;
  case 2:
    memcpy((void*)0x20df1000, "./file0/bus", 12);
    res = syscall(__NR_creat, 0x20df1000, 0xbc9dc8fbd81cb4b1);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    *(uint16_t*)0x20027000 = 1;
    *(uint16_t*)0x20027002 = 0;
    *(uint64_t*)0x20027008 = 0;
    *(uint64_t*)0x20027010 = 0;
    *(uint32_t*)0x20027018 = 0;
    syscall(__NR_fcntl, r[0], 7, 0x20027000);
    break;
  case 4:
    memcpy((void*)0x200000c0, "./file0/bus", 12);
    memcpy((void*)0x20000100, "9p", 3);
    memcpy((void*)0x20000480, "trans=fd,", 9);
    memcpy((void*)0x20000489, "rfdno", 5);
    *(uint8_t*)0x2000048e = 0x3d;
    sprintf((char*)0x2000048f, "0x%016llx", (long long)r[0]);
    *(uint8_t*)0x200004a1 = 0x2c;
    memcpy((void*)0x200004a2, "wfdno", 5);
    *(uint8_t*)0x200004a7 = 0x3d;
    sprintf((char*)0x200004a8, "0x%016llx", (long long)r[0]);
    *(uint8_t*)0x200004ba = 0x2c;
    memcpy((void*)0x200004bb, "access=any", 10);
    *(uint8_t*)0x200004c5 = 0x2c;
    memcpy((void*)0x200004c6, "cache=fscache", 13);
    *(uint8_t*)0x200004d3 = 0x2c;
    memcpy((void*)0x200004d4, "smackfsfloor", 12);
    *(uint8_t*)0x200004e0 = 0x3d;
    memcpy((void*)0x200004e1, ",/!", 3);
    *(uint8_t*)0x200004e4 = 0x2c;
    memcpy((void*)0x200004e5, "fsmagic", 7);
    *(uint8_t*)0x200004ec = 0x3d;
    sprintf((char*)0x200004ed, "0x%016llx", (long long)0xffffffff);
    *(uint8_t*)0x200004ff = 0x2c;
    memcpy((void*)0x20000500, "obj_role", 8);
    *(uint8_t*)0x20000508 = 0x3d;
    memcpy((void*)0x20000509, "vmnet1mime_type,/", 17);
    *(uint8_t*)0x2000051a = 0x2c;
    memcpy((void*)0x2000051b, "dont_measure", 12);
    *(uint8_t*)0x20000527 = 0x2c;
    memcpy((void*)0x20000528, "uid", 3);
    *(uint8_t*)0x2000052b = 0x3d;
    sprintf((char*)0x2000052c, "%020llu", (long long)0);
    *(uint8_t*)0x20000540 = 0x2c;
    memcpy((void*)0x20000541, "uid<", 4);
    sprintf((char*)0x20000545, "%020llu", (long long)0);
    *(uint8_t*)0x20000559 = 0x2c;
    *(uint8_t*)0x2000055a = 0;
    syscall(__NR_mount, 0, 0x200000c0, 0x20000100, 4, 0x20000480);
    break;
  case 5:
    syscall(__NR_unshare, 0x40600);
    break;
  case 6:
    *(uint64_t*)0x20000440 = 0x20000380;
    memcpy((void*)0x20000380, "\xdb", 1);
    *(uint64_t*)0x20000448 = 1;
    syscall(__NR_writev, r[0], 0x20000440, 1);
    break;
  case 7:
    syscall(__NR_dup2, r[0], -1);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}