linux-kernel - Re: [git pull] drm for 6.13-rc1

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Message-ID: <Z0NXQ6iRK43x6WbG@sashalap>
Date: Sun, 24 Nov 2024 11:41:39 -0500
From: Sasha Levin <sashal@...nel.org>
To: Dave Airlie <airlied@...il.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 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:

[    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