syzkaller-repros/linux/be292393a21b15b703e80f44d8d086de711bd813.c

// INFO: rcu detected stall in snd_pcm_oss_read
// https://syzkaller.appspot.com/bug?id=be292393a21b15b703e80f44d8d086de711bd813
// status:fixed
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#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 long syz_open_dev(long a0, long a1, 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);
  }
}

#ifndef __NR_sched_setattr
#define __NR_sched_setattr 314
#endif

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  long res = 0;
  memcpy((void*)0x20000040, "/dev/dsp#\x00", 10);
  res = syz_open_dev(0x20000040, 1, 0);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x2001d000 = 1;
  *(uint32_t*)0x2001d004 = 0x70;
  *(uint8_t*)0x2001d008 = 0;
  *(uint8_t*)0x2001d009 = 0;
  *(uint8_t*)0x2001d00a = 0;
  *(uint8_t*)0x2001d00b = 0;
  *(uint32_t*)0x2001d00c = 0;
  *(uint64_t*)0x2001d010 = 0x7f;
  *(uint64_t*)0x2001d018 = 0;
  *(uint64_t*)0x2001d020 = 0;
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 0, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 1, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 2, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 3, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 4, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 5, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 6, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 7, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 8, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 9, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 10, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 11, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 12, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 13, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 14, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 15, 2);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 17, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 18, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 19, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 20, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 21, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 22, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 23, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 24, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 25, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 26, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 27, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 28, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 29, 35);
  *(uint32_t*)0x2001d030 = 0;
  *(uint32_t*)0x2001d034 = 0;
  *(uint64_t*)0x2001d038 = 0;
  *(uint64_t*)0x2001d040 = 0;
  *(uint64_t*)0x2001d048 = 0;
  *(uint64_t*)0x2001d050 = 0x80000004;
  *(uint32_t*)0x2001d058 = 0;
  *(uint32_t*)0x2001d05c = 0;
  *(uint64_t*)0x2001d060 = 0;
  *(uint32_t*)0x2001d068 = 0;
  *(uint16_t*)0x2001d06c = 0;
  *(uint16_t*)0x2001d06e = 0;
  syscall(__NR_perf_event_open, 0x2001d000, 0, -1, -1, 0);
  *(uint32_t*)0x20000080 = 0;
  *(uint32_t*)0x20000084 = 2;
  *(uint64_t*)0x20000088 = 0;
  *(uint32_t*)0x20000090 = 0;
  *(uint32_t*)0x20000094 = 3;
  *(uint64_t*)0x20000098 = 0;
  *(uint64_t*)0x200000a0 = 0;
  *(uint64_t*)0x200000a8 = 0;
  syscall(__NR_sched_setattr, 0, 0x20000080, 0);
  *(uint64_t*)0x200001c0 = 0;
  syscall(__NR_ioctl, r[0], 0x80000040045010, 0x200001c0);
  syscall(__NR_read, r[0], 0x20000180, 8);
  return 0;
}