Date:   Fri, 26 Jun 2020 08:19:01 +0100
From:   Guillaume Tucker <guillaume.tucker@...labora.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Arnd Bergmann <arnd@...db.de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        linux-kernel@...r.kernel.org, Pawel Osciak <pawel@...iak.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Vandana BN <bnvandana@...il.com>, kernel@...labora.com
Subject: Re: media/master bisection:
 v4l2-compliance-uvc.Buffer-ioctls-Input-0.VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF
 on rk3399-gru-kevin

On 26/06/2020 08:02, Hans Verkuil wrote:
> Hi Guillaume,
> 
> You need to update v4l-utils to the latest version from our git master branch.
> 
> The reserved field in reqbufs is now in use as a flags field, so it is no longer
> zero. The compliance test has been updated accordingly in the v4l-utils git repo.

I see, thanks.  It's getting updated today.

Guillaume


> On 26/06/2020 08:56, Guillaume Tucker wrote:
>> Please see the bisection report below about a regression in
>> v4l2-compliance with uvcvideo:
>>
>> [   25.495039] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
>> 		fail: v4l2-test-buffers.cpp(680): check_0(reqbufs.reserved, sizeof(reqbufs.reserved))
>> 	test VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF: FAIL
>>
>>
>> as seen in the full job log:
>>
>>     https://storage.kernelci.org/media/master/v5.8-rc1-64-ge30cc79cc80f/arm64/defconfig/gcc-8/lab-collabora/v4l2-compliance-uvc-rk3399-gru-kevin.html#L1713
>>
>> with a few more details about the regression here:
>>
>>     https://kernelci.org/test/case/id/5ef23169140826f73d97bf51/
>>
>> and the same test case failure also seen with vivid:
>>
>>     https://kernelci.org/test/case/id/5ef23699f641f7b3e597bf3f/
>>
>>
>> The bisection actually ran a couple of days ago but there was an
>> email error when sending the report, so I'm sending it by hand
>> now.  I hope the issue hasn't spread too widely already, I know
>> it's also affecting linux-next.
>>
>> Guillaume
>>
>>
>> On 25/06/2020 23:19, kernelci.org bot wrote:
>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>> * This automated bisection report was sent to you on the basis  *
>>> * that you may be involved with the breaking commit it has      *
>>> * found.  No manual investigation has been done to verify it,   *
>>> * and the root cause of the problem may be somewhere else.      *
>>> *                                                               *
>>> * If you do send a fix, please include this trailer:            *
>>> *   Reported-by: "kernelci.org bot" <bot@...nelci.org>          *
>>> *                                                               *
>>> * Hope this helps!                                              *
>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>>
>>> media/master bisection: v4l2-compliance-uvc.Buffer-ioctls-Input-0.VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF on rk3399-gru-kevin
>>>
>>> Summary:
>>>   Start:      e30cc79cc80f media: media-request: Fix crash if memory allocation fails
>>>   Plain log:  https://storage.kernelci.org/media/master/v5.8-rc1-64-ge30cc79cc80f/arm64/defconfig/gcc-8/lab-collabora/v4l2-compliance-uvc-rk3399-gru-kevin.txt
>>>   HTML log:   https://storage.kernelci.org/media/master/v5.8-rc1-64-ge30cc79cc80f/arm64/defconfig/gcc-8/lab-collabora/v4l2-compliance-uvc-rk3399-gru-kevin.html
>>>   Result:     1e0b2318fa75 media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag
>>>
>>> Checks:
>>>   revert:     PASS
>>>   verify:     PASS
>>>
>>> Parameters:
>>>   Tree:       media
>>>   URL:        https://git.linuxtv.org/media_tree.git
>>>   Branch:     master
>>>   Target:     rk3399-gru-kevin
>>>   CPU arch:   arm64
>>>   Lab:        lab-collabora
>>>   Compiler:   gcc-8
>>>   Config:     defconfig
>>>   Test case:  v4l2-compliance-uvc.Buffer-ioctls-Input-0.VIDIOC_REQBUFS/CREATE_BUFS/QUERYBUF
>>>
>>> Breaking commit found:
>>>
>>> -------------------------------------------------------------------------------
>>> commit 1e0b2318fa75d186ee0d2be31843ce867385fcc4
>>> Author: Sergey Senozhatsky <senozhatsky@...omium.org>
>>> Date:   Thu May 14 18:01:45 2020 +0200
>>>
>>>     media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag
>>>     
>>>     This patch lets user-space to request a non-consistent memory
>>>     allocation during CREATE_BUFS and REQBUFS ioctl calls.
>>>     
>>>     = CREATE_BUFS
>>>     
>>>       struct v4l2_create_buffers has seven 4-byte reserved areas,
>>>       so reserved[0] is renamed to ->flags. The struct, thus, now
>>>       has six reserved 4-byte regions.
>>>     
>>>     = CREATE_BUFS32
>>>     
>>>       struct v4l2_create_buffers32 has seven 4-byte reserved areas,
>>>       so reserved[0] is renamed to ->flags. The struct, thus, now
>>>       has six reserved 4-byte regions.
>>>     
>>>     = REQBUFS
>>>     
>>>      We use one bit of a ->reserved[1] member of struct v4l2_requestbuffers,
>>>      which is now renamed to ->flags. Unlike v4l2_create_buffers, struct
>>>      v4l2_requestbuffers does not have enough reserved room. Therefore for
>>>      backward compatibility  ->reserved and ->flags were put into anonymous
>>>      union.
>>>     
>>>     Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
>>>     Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
>>>     Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
>>>
>>> diff --git a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
>>> index e1afc5b504c2..f2a702870fad 100644
>>> --- a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
>>> +++ b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
>>> @@ -121,7 +121,12 @@ than the number requested.
>>>  	other changes, then set ``count`` to 0, ``memory`` to
>>>  	``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type.
>>>      * - __u32
>>> -      - ``reserved``\ [7]
>>> +      - ``flags``
>>> +      - Specifies additional buffer management attributes.
>>> +	See :ref:`memory-flags`.
>>> +
>>> +    * - __u32
>>> +      - ``reserved``\ [6]
>>>        - A place holder for future extensions. Drivers and applications
>>>  	must set the array to zero.
>>>  
>>> diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
>>> index 96a59793d857..75d894d9c36c 100644
>>> --- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
>>> +++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
>>> @@ -112,10 +112,17 @@ aborting or finishing any DMA in progress, an implicit
>>>  	``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will
>>>  	free any previously allocated buffers, so this is typically something
>>>  	that will be done at the start of the application.
>>> +    * - union {
>>> +      - (anonymous)
>>> +    * - __u32
>>> +      - ``flags``
>>> +      - Specifies additional buffer management attributes.
>>> +	See :ref:`memory-flags`.
>>>      * - __u32
>>>        - ``reserved``\ [1]
>>> -      - A place holder for future extensions. Drivers and applications
>>> -	must set the array to zero.
>>> +      - Kept for backwards compatibility. Use ``flags`` instead.
>>> +    * - }
>>> +      -
>>>  
>>>  .. tabularcolumns:: |p{6.1cm}|p{2.2cm}|p{8.7cm}|
>>>  
>>> diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
>>> index 0fdcf90330df..626c4db5134c 100644
>>> --- a/drivers/media/common/videobuf2/videobuf2-core.c
>>> +++ b/drivers/media/common/videobuf2/videobuf2-core.c
>>> @@ -694,6 +694,9 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
>>>  	unsigned int i;
>>>  	int ret;
>>>  
>>> +	if (flags & V4L2_FLAG_MEMORY_NON_CONSISTENT)
>>> +		consistent_mem = false;
>>> +
>>>  	if (q->streaming) {
>>>  		dprintk(1, "streaming active\n");
>>>  		return -EBUSY;
>>> @@ -837,6 +840,9 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
>>>  	bool consistent_mem = true;
>>>  	int ret;
>>>  
>>> +	if (flags & V4L2_FLAG_MEMORY_NON_CONSISTENT)
>>> +		consistent_mem = false;
>>> +
>>>  	if (q->num_buffers == VB2_MAX_FRAME) {
>>>  		dprintk(1, "maximum number of buffers already allocated\n");
>>>  		return -ENOBUFS;
>>> diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
>>> index 26a3ec333bb7..559a229cac41 100644
>>> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
>>> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
>>> @@ -718,12 +718,22 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
>>>  #endif
>>>  }
>>>  
>>> +static void clear_consistency_attr(struct vb2_queue *q,
>>> +				   int memory,
>>> +				   unsigned int *flags)
>>> +{
>>> +	if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP)
>>> +		*flags &= ~V4L2_FLAG_MEMORY_NON_CONSISTENT;
>>> +}
>>> +
>>>  int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
>>>  {
>>>  	int ret = vb2_verify_memory_type(q, req->memory, req->type);
>>>  
>>>  	fill_buf_caps(q, &req->capabilities);
>>> -	return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count);
>>> +	clear_consistency_attr(q, req->memory, &req->flags);
>>> +	return ret ? ret : vb2_core_reqbufs(q, req->memory,
>>> +					    req->flags, &req->count);
>>>  }
>>>  EXPORT_SYMBOL_GPL(vb2_reqbufs);
>>>  
>>> @@ -755,6 +765,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
>>>  	unsigned i;
>>>  
>>>  	fill_buf_caps(q, &create->capabilities);
>>> +	clear_consistency_attr(q, create->memory, &create->flags);
>>>  	create->index = q->num_buffers;
>>>  	if (create->count == 0)
>>>  		return ret != -EBUSY ? ret : 0;
>>> @@ -797,8 +808,11 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
>>>  	for (i = 0; i < requested_planes; i++)
>>>  		if (requested_sizes[i] == 0)
>>>  			return -EINVAL;
>>> -	return ret ? ret : vb2_core_create_bufs(q, create->memory, 0,
>>> -		&create->count, requested_planes, requested_sizes);
>>> +	return ret ? ret : vb2_core_create_bufs(q, create->memory,
>>> +						create->flags,
>>> +						&create->count,
>>> +						requested_planes,
>>> +						requested_sizes);
>>>  }
>>>  EXPORT_SYMBOL_GPL(vb2_create_bufs);
>>>  
>>> @@ -969,11 +983,12 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv,
>>>  	int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
>>>  
>>>  	fill_buf_caps(vdev->queue, &p->capabilities);
>>> +	clear_consistency_attr(vdev->queue, p->memory, &p->flags);
>>>  	if (res)
>>>  		return res;
>>>  	if (vb2_queue_is_busy(vdev, file))
>>>  		return -EBUSY;
>>> -	res = vb2_core_reqbufs(vdev->queue, p->memory, 0, &p->count);
>>> +	res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count);
>>>  	/* If count == 0, then the owner has released all buffers and he
>>>  	   is no longer owner of the queue. Otherwise we have a new owner. */
>>>  	if (res == 0)
>>> @@ -991,6 +1006,7 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv,
>>>  
>>>  	p->index = vdev->queue->num_buffers;
>>>  	fill_buf_caps(vdev->queue, &p->capabilities);
>>> +	clear_consistency_attr(vdev->queue, p->memory, &p->flags);
>>>  	/*
>>>  	 * If count == 0, then just check if memory and type are valid.
>>>  	 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
>>> diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
>>> index a99e82ec9ab6..593bcf6c3735 100644
>>> --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
>>> +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
>>> @@ -246,6 +246,9 @@ struct v4l2_format32 {
>>>   * @memory:	buffer memory type
>>>   * @format:	frame format, for which buffers are requested
>>>   * @capabilities: capabilities of this buffer type.
>>> + * @flags:	additional buffer management attributes (ignored unless the
>>> + *		queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability and
>>> + *		configured for MMAP streaming I/O).
>>>   * @reserved:	future extensions
>>>   */
>>>  struct v4l2_create_buffers32 {
>>> @@ -254,7 +257,8 @@ struct v4l2_create_buffers32 {
>>>  	__u32			memory;	/* enum v4l2_memory */
>>>  	struct v4l2_format32	format;
>>>  	__u32			capabilities;
>>> -	__u32			reserved[7];
>>> +	__u32			flags;
>>> +	__u32			reserved[6];
>>>  };
>>>  
>>>  static int __bufsize_v4l2_format(struct v4l2_format32 __user *p32, u32 *size)
>>> @@ -355,7 +359,8 @@ static int get_v4l2_create32(struct v4l2_create_buffers __user *p64,
>>>  {
>>>  	if (!access_ok(p32, sizeof(*p32)) ||
>>>  	    copy_in_user(p64, p32,
>>> -			 offsetof(struct v4l2_create_buffers32, format)))
>>> +			 offsetof(struct v4l2_create_buffers32, format)) ||
>>> +	    assign_in_user(&p64->flags, &p32->flags))
>>>  		return -EFAULT;
>>>  	return __get_v4l2_format32(&p64->format, &p32->format,
>>>  				   aux_buf, aux_space);
>>> @@ -417,6 +422,7 @@ static int put_v4l2_create32(struct v4l2_create_buffers __user *p64,
>>>  	    copy_in_user(p32, p64,
>>>  			 offsetof(struct v4l2_create_buffers32, format)) ||
>>>  	    assign_in_user(&p32->capabilities, &p64->capabilities) ||
>>> +	    assign_in_user(&p32->flags, &p64->flags) ||
>>>  	    copy_in_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
>>>  		return -EFAULT;
>>>  	return __put_v4l2_format32(&p64->format, &p32->format);
>>> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
>>> index 2322f08a98be..02bfef0da76d 100644
>>> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
>>> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
>>> @@ -2038,9 +2038,6 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
>>>  
>>>  	if (ret)
>>>  		return ret;
>>> -
>>> -	CLEAR_AFTER_FIELD(p, capabilities);
>>> -
>>>  	return ops->vidioc_reqbufs(file, fh, p);
>>>  }
>>>  
>>> @@ -2080,7 +2077,7 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
>>>  	if (ret)
>>>  		return ret;
>>>  
>>> -	CLEAR_AFTER_FIELD(create, capabilities);
>>> +	CLEAR_AFTER_FIELD(create, flags);
>>>  
>>>  	v4l_sanitize_format(&create->format);
>>>  
>>> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
>>> index 34ba1017b89b..fec2607a07e3 100644
>>> --- a/include/uapi/linux/videodev2.h
>>> +++ b/include/uapi/linux/videodev2.h
>>> @@ -946,7 +946,10 @@ struct v4l2_requestbuffers {
>>>  	__u32			type;		/* enum v4l2_buf_type */
>>>  	__u32			memory;		/* enum v4l2_memory */
>>>  	__u32			capabilities;
>>> -	__u32			reserved[1];
>>> +	union {
>>> +		__u32		flags;
>>> +		__u32		reserved[1];
>>> +	};
>>>  };
>>>  
>>>  /* capabilities for struct v4l2_requestbuffers and v4l2_create_buffers */
>>> @@ -2450,6 +2453,9 @@ struct v4l2_dbg_chip_info {
>>>   * @memory:	enum v4l2_memory; buffer memory type
>>>   * @format:	frame format, for which buffers are requested
>>>   * @capabilities: capabilities of this buffer type.
>>> + * @flags:	additional buffer management attributes (ignored unless the
>>> + *		queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability
>>> + *		and configured for MMAP streaming I/O).
>>>   * @reserved:	future extensions
>>>   */
>>>  struct v4l2_create_buffers {
>>> @@ -2458,7 +2464,8 @@ struct v4l2_create_buffers {
>>>  	__u32			memory;
>>>  	struct v4l2_format	format;
>>>  	__u32			capabilities;
>>> -	__u32			reserved[7];
>>> +	__u32			flags;
>>> +	__u32			reserved[6];
>>>  };
>>>  
>>>  /*
>>> -------------------------------------------------------------------------------
>>>
>>>
>>> Git bisection log:
>>>
>>> -------------------------------------------------------------------------------
>>> git bisect start
>>> # good: [2630e1bb0948c3134c6f22ad275ae27cc6023532] media: rkvdec: Fix H264 scaling list order
>>> git bisect good 2630e1bb0948c3134c6f22ad275ae27cc6023532
>>> # bad: [e30cc79cc80fd919b697a15c5000d9f57487de8e] media: media-request: Fix crash if memory allocation fails
>>> git bisect bad e30cc79cc80fd919b697a15c5000d9f57487de8e
>>> # good: [cb8e59cc87201af93dfbb6c3dccc8fcad72a09c2] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
>>> git bisect good cb8e59cc87201af93dfbb6c3dccc8fcad72a09c2
>>> # good: [3b69e8b4571125bec1f77f886174fe6cab6b9d75] Merge tag 'sh-for-5.8' of git://git.libc.org/linux-sh
>>> git bisect good 3b69e8b4571125bec1f77f886174fe6cab6b9d75
>>> # good: [3ed740841bf94a8028ec44164d84f9af9bd552fd] maccess: remove duplicate kerneldoc comments
>>> git bisect good 3ed740841bf94a8028ec44164d84f9af9bd552fd
>>> # good: [2ab70319bc1f79228da4dce7b9d604740c9beeef] nmi, tracing: Make hardware latency tracing noinstr safe
>>> git bisect good 2ab70319bc1f79228da4dce7b9d604740c9beeef
>>> # good: [df2fbf5bfa0e7fff8b4784507e4d68f200454318] Merge tag 'thermal-v5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux
>>> git bisect good df2fbf5bfa0e7fff8b4784507e4d68f200454318
>>> # good: [91fa58840ae22cbf6d7c505ce6564c4c48f29af3] Merge branch 'i2c/for-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
>>> git bisect good 91fa58840ae22cbf6d7c505ce6564c4c48f29af3
>>> # good: [bc139119a1708ae3db1ebb379630f286e28d06e8] net: ethernet: ti: ale: fix allmulti for nu type ale
>>> git bisect good bc139119a1708ae3db1ebb379630f286e28d06e8
>>> # good: [157282a5c6273976b31cf4ba4b1c46663f6519d1] media: s5k6a3: Fix runtime PM imbalance on error
>>> git bisect good 157282a5c6273976b31cf4ba4b1c46663f6519d1
>>> # bad: [286cf7d3a99e1ca8c1d8e674b9a98f2dbe8520dc] media: videodev2.h: add V4L2_FMT_FLAG_ENC_CAP_FRAME_INTERVAL flag
>>> git bisect bad 286cf7d3a99e1ca8c1d8e674b9a98f2dbe8520dc
>>> # good: [ac53503ee38a1ffbc47c7cca6cbfc48ba9c65c5e] media: videobuf2: add V4L2_FLAG_MEMORY_NON_CONSISTENT flag
>>> git bisect good ac53503ee38a1ffbc47c7cca6cbfc48ba9c65c5e
>>> # bad: [d4db5eb57cab049d378fbfb7ee842857009a8679] media: videobuf2: add begin/end cpu_access callbacks to dma-sg
>>> git bisect bad d4db5eb57cab049d378fbfb7ee842857009a8679
>>> # bad: [38a417e88aad1e5ad5ff2647d4cd26040b567fc3] media: videobuf2: factor out planes prepare/finish functions
>>> git bisect bad 38a417e88aad1e5ad5ff2647d4cd26040b567fc3
>>> # bad: [1e0b2318fa75d186ee0d2be31843ce867385fcc4] media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag
>>> git bisect bad 1e0b2318fa75d186ee0d2be31843ce867385fcc4
>>> # good: [7b4b45555c79db03dad8192e6ef85cb30236827b] media: videobuf2: add queue memory consistency parameter
>>> git bisect good 7b4b45555c79db03dad8192e6ef85cb30236827b
>>> # first bad commit: [1e0b2318fa75d186ee0d2be31843ce867385fcc4] media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag
>>> -------------------------------------------------------------------------------
>>>
>>
> 

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