Re: [PATCH net-next v10 06/10] tap: Introduce virtio-net hash feature

[Paolo Abeni <pabeni@xxxxxxxxxx>]

On 3/13/25 8:01 AM, Akihiko Odaki wrote:
> @@ -998,6 +1044,16 @@ static long tap_ioctl(struct file *file, unsigned int cmd,
>  		rtnl_unlock();
>  		return ret;
>  
> +	case TUNGETVNETHASHCAP:
> +		return tun_vnet_ioctl_gethashcap(argp);
> +
> +	case TUNSETVNETHASH:
> +		rtnl_lock();
> +		tap = rtnl_dereference(q->tap);
> +		ret = tap ? tun_vnet_ioctl_sethash(&tap->vnet_hash, argp) : -EBADFD;


Not really a review, but apparently this is causing intermittent memory
leak in self tests:

xx__-> echo scan > /sys/kernel/debug/kmemleak && cat
/sys/kernel/debug/kmemleak
unreferenced object 0xffff88800c6ec248 (size 8):
  comm "tap", pid 21124, jiffies 4299141559
  hex dump (first 8 bytes):
    00 00 00 00 00 00 00 00                          ........
  backtrace (crc 0):
    __kmalloc_cache_noprof+0x2df/0x390
    tun_vnet_ioctl_sethash+0xbf/0x3a0
    tap_ioctl+0x6f2/0xc10
    __x64_sys_ioctl+0x11f/0x180
    do_syscall_64+0xc1/0x1d0
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

Could you please have a look?

Thanks!

Paolo