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Date: Sat, 9 Mar 2024 10:20:08 +0100
From: Dominik Brodowski <linux@dominikbrodowski.net>
To: "Wu, Wentong" <wentong.wu@intel.com>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>,
	"Winkler, Tomas" <tomas.winkler@intel.com>,
	"mchehab@kernel.org" <mchehab@kernel.org>,
	"hverkuil-cisco@xs4all.nl" <hverkuil-cisco@xs4all.nl>,
	"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: v6.8.0-rc6: mei_ace_probe / mei_vsc_probe: do not call blocking
 ops when !TASK_RUNNING
Message-ID: <ZewpyJ3d7gx3dSvA@shine.dominikbrodowski.net>
References: <Zd9wUv1zSJ59WS8i@shine.dominikbrodowski.net>
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 <ZeAymVVsI-CNj6Pc@kekkonen.localdomain>
 <ZeC2jss4IAM4aPWy@shine.dominikbrodowski.net>
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Hi Wetong,

Am Fri, Mar 08, 2024 at 11:45:44PM +0000 schrieb Wu, Wentong:
> Did you try master branch (v6.8) without IPU6 driver? There
> should be problems with the IPU6 driver you use as below:
> 
> > intel-ipu6 0000:00:05.0: Found supported sensor OVTI01A0:00
> > intel-ipu6 0000:00:05.0: Connected 1 cameras
> 
> If not, could you please help try it on your side?

Branch master from https://git.linuxtv.org/sailus/media_tree.git/ causes a
WARNING during boot; some extracts from dmesg:


mei_me 0000:00:16.0: enabling device (0000 -> 0002)
mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops i915_hdcp_ops)
mei_pxp 0000:00:16.0-fbf6fcf1-96cf-4e2e-a6a6-1bab8cbe36b1: bound 0000:00:02.0 (ops i915_pxp_tee_component_ops)
intel_vsc intel_vsc: silicon stepping version is 0:2
------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=2 set at [<000000001b97ea26>] prepare_to_wait_event+0x54/0x1a0
WARNING: CPU: 5 PID: 124 at kernel/sched/core.c:10099 __might_sleep+0x59/0x60
Modules linked in:
CPU: 5 PID: 124 Comm: kworker/u24:2 Tainted: G                T  6.8.0-rc2+ #2
Hardware name: Dell Inc. XPS 9315/00KRKP, BIOS 1.1.3 05/11/2022
Workqueue: events_unbound deferred_probe_work_func
RIP: 0010:__might_sleep+0x59/0x60
Code: ee 48 89 df 5b 31 d2 5d e9 24 fd ff ff 48 8b 90 60 15 00 00 48 c7 c7 a8 3e aa 84 c6 05 6f b3 47 03 01 48 89 d1 e8 b7 6c fb ff <0f> 0b eb d1 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffbd3ec1287a98 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff84a07d0f RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000ea5 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffa224892a3028 R14: ffffa22494ac1028 R15: 00000000c1287b00
FS:  0000000000000000(0000) GS:ffffa22bef680000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557ffdf03148 CR3: 00000002b645c000 CR4: 0000000000f50ef0
PKRU: 55555554
Call Trace:
 <TASK>
 ? __might_sleep+0x59/0x60
 ? __warn+0x80/0x170
 ? __might_sleep+0x59/0x60
 ? report_bug+0x182/0x1b0
 ? handle_bug+0x40/0x80
 ? exc_invalid_op+0x17/0x80
 ? asm_exc_invalid_op+0x1a/0x20
 ? __might_sleep+0x59/0x60
 ? __might_sleep+0x59/0x60
 gpiod_get_value_cansleep+0x19/0x60
 vsc_tp_xfer+0x177/0x570
 ? __pfx_autoremove_wake_function+0x10/0x10
 mei_vsc_write+0xe5/0x1d0
 mei_hbm_cl_flow_control_req+0x84/0xd0
 mei_cl_read_start+0x23b/0x330
 mei_cldev_register_rx_cb+0xf5/0x140
 mei_ace_probe+0x11f/0x390
 ? kernfs_add_one+0x146/0x180
 ? really_probe+0x166/0x300
 really_probe+0x166/0x300
 ? __pfx___device_attach_driver+0x10/0x10
 __driver_probe_device+0x6e/0x120
 driver_probe_device+0x1a/0x90
 __device_attach_driver+0x8e/0xd0
 bus_for_each_drv+0x90/0xf0
 __device_attach+0xac/0x1a0
 ? process_one_work+0x19c/0x500
 bus_probe_device+0x93/0xb0
 ? process_one_work+0x19c/0x500
 deferred_probe_work_func+0x96/0xd0
 process_one_work+0x205/0x500
 worker_thread+0x1dc/0x3e0
 ? __pfx_worker_thread+0x10/0x10
 kthread+0xea/0x120
 ? __pfx_kthread+0x10/0x10
 ret_from_fork+0x2c/0x50
 ? __pfx_kthread+0x10/0x10
 ret_from_fork_asm+0x1b/0x30
 </TASK>
irq event stamp: 1166879
hardirqs last  enabled at (1166885): [<ffffffff81cb6348>] console_unlock+0x118/0x170
hardirqs last disabled at (1166890): [<ffffffff81cb632d>] console_unlock+0xfd/0x170
softirqs last  enabled at (1166640): [<ffffffff81c1333e>] irq_exit_rcu+0x7e/0xa0
softirqs last disabled at (1166635): [<ffffffff81c1333e>] irq_exit_rcu+0x7e/0xa0
---[ end trace 0000000000000000 ]---
mei intel_vsc-5db76cf6-0a68-4ed6-9b78-0361635e2447: deferred probe pending: (reason unknown)
mei intel_vsc-92335fcf-3203-4472-af93-7b4453ac29da: deferred probe pending: (reason unknown)


Best,
	Dominik