syzkaller-repros/linux/851fe012db565ade456cf85782c651b7d1624bd9.c

// possible deadlock in hsr_dev_destroy
// https://syzkaller.appspot.com/bug?id=851fe012db565ade456cf85782c651b7d1624bd9
// status:open
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.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>

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 + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

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);
    }
  }
}

uint64_t r[7] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
  setup_fault();
  intptr_t res = 0;
  syscall(__NR_socket, 0xaul, 1ul, 0ul);
  syscall(__NR_perf_event_open, 0ul, 0, 0ul, -1, 0ul);
  syscall(__NR_getsockopt, -1, 1ul, 0x11ul, 0ul, 0ul);
  syscall(__NR_setuid, 0);
  syscall(__NR_mkdir, 0ul, 0ul);
  syscall(__NR_openat, 0xffffff9c, 0ul, 0x275aul, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x3000ul, 0ul, 0x10ul, -1, 0);
  syscall(__NR_socket, 1ul, 1ul, 0ul);
  syscall(__NR_socket, 0xaul, 3ul, 7);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socketpair, 1ul, 1ul, 0ul, 0x20000000ul);
  if (res != -1)
    r[1] = *(uint32_t*)0x20000004;
  res = syscall(__NR_dup, r[1]);
  if (res != -1)
    r[2] = res;
  *(uint32_t*)0x20000040 = 0x12;
  res = syscall(__NR_getpeername, r[2], 0x20000000ul, 0x20000040ul);
  if (res != -1)
    r[3] = *(uint32_t*)0x20000004;
  res = syscall(__NR_socketpair, 1ul, 1ul, 0ul, 0x20000000ul);
  if (res != -1)
    r[4] = *(uint32_t*)0x20000004;
  res = syscall(__NR_dup, r[4]);
  if (res != -1)
    r[5] = res;
  *(uint32_t*)0x20000040 = 0x12;
  res = syscall(__NR_getpeername, r[5], 0x20000000ul, 0x20000040ul);
  if (res != -1)
    r[6] = *(uint32_t*)0x20000004;
  *(uint64_t*)0x20000180 = 0;
  *(uint32_t*)0x20000188 = 0xe002;
  *(uint64_t*)0x20000190 = 0x20000000;
  *(uint64_t*)0x20000000 = 0x20000040;
  memcpy((void*)0x20000040, "\x40\x00\x00\x00\x10\x00\x01\x06\x00\x00\x00\x00"
                            "\x00\x00\x00\x00\x00\x00\x00\x00",
         20);
  *(uint32_t*)0x20000054 = 0;
  memcpy((void*)0x20000058, "\x00\x00\x00\x00\x00\x00\x00\x00\x20\x00\x12\x00"
                            "\x08\x00\x01\x00\x68\x73\x72\x00\x14\x00\x02\x00"
                            "\x08\x00\x02\x00",
         28);
  *(uint32_t*)0x20000074 = r[3];
  memcpy((void*)0x20000078, "\x08\x00\x01\x00", 4);
  *(uint32_t*)0x2000007c = r[6];
  *(uint64_t*)0x20000008 = 0x40;
  *(uint64_t*)0x20000198 = 1;
  *(uint64_t*)0x200001a0 = 0;
  *(uint64_t*)0x200001a8 = 0;
  *(uint32_t*)0x200001b0 = 0;
  inject_fault(10);
  syscall(__NR_sendmsg, r[0], 0x20000180ul, 0ul);
  return 0;
}