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Message-ID: <047d3c51-0a9e-4c3e-beef-625a7aa4f3c3@kernel.org>
Date:   Mon, 25 Sep 2023 07:35:25 +0200
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To:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>, hmh@hmh.eng.br
Cc:     "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
        ibm-acpi-devel@lists.sourceforge.net,
        platform-driver-x86@vger.kernel.org,
        Linux kernel mailing list <linux-kernel@vger.kernel.org>
From:   Jiri Slaby <jirislaby@kernel.org>
Subject: WARNING at drivers/acpi/platform_profile.c:74 in
 platform_profile_show()
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Hi,

according to logs, since 6.3 (up to 6.5.4 now), I repeatedly see:
 > WARNING: CPU: 14 PID: 962 at drivers/acpi/platform_profile.c:74 
platform_profile_show+0xb1/0x100 [platform_profile]
 > Modules linked in: ccm michael_mic ...
 > CPU: 14 PID: 962 Comm: power-profiles- Kdump: loaded Not tainted 
6.5.4-6-default #1 openSUSE Tumbleweed (unreleased) 
dd37106c593be78644bb80e3c1534d801bf4cb36
 > Hardware name: LENOVO 21CRS0K83K/21CRS0K83K, BIOS R22ET60W (1.30 ) 
02/09/2023
 > RIP: 0010:platform_profile_show+0xb1/0x100 [platform_profile]
 > Code: d0 a8 ...
 > RSP: 0018:ffff9c1ac0b97db0 EFLAGS: 00010296
 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000008fc35be0
 > RDX: 0000000000000000 RSI: ffff9c1ac0b97db4 RDI: ffffffffc0a8b0a0
 > RBP: ffff8955ca540000 R08: ffff895b9f1ed180 R09: ffff895559ea1bc0
 > R10: 00000000031a400e R11: 000000000003f680 R12: ffff895b9f1ed180
 > R13: ffff9c1ac0b97e50 R14: 0000000000000001 R15: ffff9c1ac0b97ee8
 > FS:  00007f71b0e71900(0000) GS:ffff895b9f100000(0000) 
knlGS:0000000000000000
 > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 > CR2: 00007fe402ea3400 CR3: 000000012004c000 CR4: 0000000000750ee0
 > PKRU: 55555554
 > Call Trace:
 >  <TASK>
 >  sysfs_kf_seq_show+0xab/0x100
 >  seq_read_iter+0x123/0x480
 >  vfs_read+0x1b8/0x300

It's:
WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names))))

So I put there one more print:
dev_warn(dev, "profile=%d profile_get=%ps\n",
          profile, cur_profile->profile_get);

and I see:
: profile=-1883022368 profile_get=dytc_profile_get [thinkpad_acpi]
: profile=-1510173440 profile_get=dytc_profile_get [thinkpad_acpi]
: profile=-1510173440 profile_get=dytc_profile_get [thinkpad_acpi]
: profile=-966231712 profile_get=dytc_profile_get [thinkpad_acpi]
: profile=-1578420592 profile_get=dytc_profile_get [thinkpad_acpi]
: profile=-1578420592 profile_get=dytc_profile_get [thinkpad_acpi]
: profile=-1578420592 profile_get=dytc_profile_get [thinkpad_acpi]

where the profile values in hex are like:
ffffffff8fc35be0
ffffffffa5fc9500
ffffffffc6687960

Looking at simplicity of dytc_profile_get(), I wonder how that can happen.

I also wonder about dev passed to dytc_profile_get() having empty name 
(nothing before colon above)? Is that expected?

Any ideas?

thanks,
-- 
js
suse labs