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Message-ID: <95f01caa-0f32-4c5c-b262-435f839c81aa@gmail.com>
Date: Mon, 25 Nov 2024 01:35:09 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Dave Airlie <airlied@...il.com>, Sasha Levin <sashal@...nel.org>,
CK Hu <ck.hu@...iatek.com>, wenst@...omium.org,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Sima Vetter <sima@...ll.ch>, dri-devel <dri-devel@...ts.freedesktop.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] drm for 6.13-rc1
On 24/11/2024 23:58, Dave Airlie wrote:
> On Mon, 25 Nov 2024 at 02:41, Sasha Levin <sashal@...nel.org> wrote:
>>
>> On Thu, Nov 21, 2024 at 10:25:45AM +1000, Dave Airlie wrote:
>>> Hi Linus,
>>>
>>> This is the main drm pull request for 6.13.
>>>
>>> I've done a test merge into your tree, there were two conflicts both
>>> of which seem easy enough to resolve for you.
>>>
>>> There's a lot of rework, the panic helper support is being added to
>>> more drivers, v3d gets support for HW superpages, scheduler
>>> documentation, drm client and video aperture reworks, some new
>>> MAINTAINERS added, amdgpu has the usual lots of IP refactors, Intel
>>> has some Pantherlake enablement and xe is getting some SRIOV bits, but
>>> just lots of stuff everywhere.
>>>
>>> Let me know if there are any issues,
>>
>> Hey Dave,
>>
>> After the PR was merged, I've started seeing boot failures reported by
>> KernelCI:
>
> I'll add the mediatek names I see who touched anything in the area recently.
>
> Dave.
>>
>> [ 4.395400] mediatek-drm mediatek-drm.5.auto: bound 1c014000.merge (ops 0xffffd35fd12975f8)
>> [ 4.396155] mediatek-drm mediatek-drm.5.auto: bound 1c000000.ovl (ops 0xffffd35fd12977b8)
>> [ 4.411951] mediatek-drm mediatek-drm.5.auto: bound 1c002000.rdma (ops 0xffffd35fd12989c0)
>> [ 4.536837] mediatek-drm mediatek-drm.5.auto: bound 1c004000.ccorr (ops 0xffffd35fd1296cf0)
>> [ 4.545181] mediatek-drm mediatek-drm.5.auto: bound 1c005000.aal (ops 0xffffd35fd1296a80)
>> [ 4.553344] mediatek-drm mediatek-drm.5.auto: bound 1c006000.gamma (ops 0xffffd35fd12972b0)
>> [ 4.561680] mediatek-drm mediatek-drm.5.auto: bound 1c014000.merge (ops 0xffffd35fd12975f8)
>> [ 4.570025] ------------[ cut here ]------------
>> [ 4.574630] refcount_t: underflow; use-after-free.
>> [ 4.579416] WARNING: CPU: 6 PID: 81 at lib/refcount.c:28 refcount_warn_saturate+0xf4/0x148
>> [ 4.587670] Modules linked in:
>> [ 4.590714] CPU: 6 UID: 0 PID: 81 Comm: kworker/u32:3 Tainted: G W 6.12.0 #1 cab58e2e59020ebd4be8ada89a65f465a316c742
>> [ 4.602695] Tainted: [W]=WARN
>> [ 4.605649] Hardware name: Acer Tomato (rev2) board (DT)
>> [ 4.610947] Workqueue: events_unbound deferred_probe_work_func
>> [ 4.616768] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>> [ 4.623715] pc : refcount_warn_saturate+0xf4/0x148
>> [ 4.628493] lr : refcount_warn_saturate+0xf4/0x148
>> [ 4.633270] sp : ffff8000807639c0
>> [ 4.636571] x29: ffff8000807639c0 x28: ffff34ff4116c640 x27: ffff34ff4368e080
>> [ 4.643693] x26: ffffd35fd1299ac8 x25: ffff34ff46c8c410 x24: 0000000000000000
>> [ 4.650814] x23: ffff34ff4368e080 x22: 00000000fffffdfb x21: 0000000000000002
>> [ 4.657934] x20: ffff34ff470c6000 x19: ffff34ff410c7c10 x18: 0000000000000006
>> [ 4.665055] x17: 666678302073706f x16: 2820656772656d2e x15: ffff800080763440
>> [ 4.672176] x14: 0000000000000000 x13: 2e656572662d7265 x12: ffffd35fd2ed14f0
>> [ 4.679297] x11: 0000000000000001 x10: 0000000000000001 x9 : ffffd35fd0342150
>> [ 4.686418] x8 : c0000000ffffdfff x7 : ffffd35fd2e21450 x6 : 00000000000affa8
>> [ 4.693539] x5 : ffffd35fd2ed1498 x4 : 0000000000000000 x3 : 0000000000000000
>> [ 4.700660] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff34ff40932580
>> [ 4.707781] Call trace:
>> [ 4.710216] refcount_warn_saturate+0xf4/0x148 (P)
>> [ 4.714993] refcount_warn_saturate+0xf4/0x148 (L)
>> [ 4.719772] kobject_put+0x110/0x118
>> [ 4.723335] put_device+0x1c/0x38
>> [ 4.726638] mtk_drm_bind+0x294/0x5c0
>> [ 4.730289] try_to_bring_up_aggregate_device+0x16c/0x1e0
>> [ 4.735673] __component_add+0xbc/0x1c0
>> [ 4.739495] component_add+0x1c/0x30
>> [ 4.743058] mtk_disp_rdma_probe+0x140/0x210
>> [ 4.747314] platform_probe+0x70/0xd0
>> [ 4.750964] really_probe+0xc4/0x2a8
>> [ 4.754527] __driver_probe_device+0x80/0x140
>> [ 4.758870] driver_probe_device+0x44/0x120
>> [ 4.763040] __device_attach_driver+0xc0/0x108
>> [ 4.767470] bus_for_each_drv+0x8c/0xf0
>> [ 4.771294] __device_attach+0xa4/0x198
>> [ 4.775117] device_initial_probe+0x1c/0x30
>> [ 4.779286] bus_probe_device+0xb4/0xc0
>> [ 4.783109] deferred_probe_work_func+0xb0/0x100
>> [ 4.787714] process_one_work+0x18c/0x420
>> [ 4.791712] worker_thread+0x30c/0x418
>> [ 4.795449] kthread+0x128/0x138
>> [ 4.798665] ret_from_fork+0x10/0x20
>> [ 4.802229] ---[ end trace 0000000000000000 ]---
>>
>> I don't think that I'll be able to bisect further as I don't have the
>> relevant hardware available.
>>
>> --
>> Thanks,
>> Sasha
Hello, I am one of those who touched something in the area.
To check if my changes are the cause of the boot failures, please apply
this patch:
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 9a8ef8558da9..85be035a209a 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -373,11 +373,12 @@ static bool mtk_drm_get_all_drm_priv(struct device
*dev)
struct mtk_drm_private *temp_drm_priv;
struct device_node *phandle = dev->parent->of_node;
const struct of_device_id *of_id;
+ struct device_node *node;
struct device *drm_dev;
unsigned int cnt = 0;
int i, j;
- for_each_child_of_node_scoped(phandle->parent, node) {
+ for_each_child_of_node(phandle->parent, node) {
struct platform_device *pdev;
of_id = of_match_node(mtk_drm_of_ids, node);
---
This chunk can be found in mtk_drm_get_all_drm_priv(), which is not
listed in the trace, but it is called from mtk_drm_bind().
The loop did not release the child_node if cnt == MAX_CRTC (by means of
a break), which goes against how for_each_child_of_node() should be
handled. If the child_node is indeed required afterwards (it is not
referenced anywhere after the loop), it should be acquired via
of_node_get() and stored somewhere to be able to put it later.
Then another issue would lie underneath as the reference to the
child_node is not stored in any way. But if this patch fixes the issue,
then I suppose it should be applied immediately, and the rest should be
discussed later on.
By the way, are there any logs with debug/error messages to analyze
further is the issue is something different?
Thanks and best regards,
Javier Carrasco
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