linux-kernel - Re: BUG: bisected: thermald regression (MEMLEAK) in commit c7ff29763989bd09c433f73fae3c1e1c15d9cda4

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Date:   Wed, 26 Oct 2022 19:52:03 +0200
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>, rjw@...ysocki.net
Cc:     regressions@...ts.linux.dev, regressions@...mhuis.info,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Robert Moore <robert.moore@...el.com>, devel@...ica.org
Subject: Re: BUG: bisected: thermald regression (MEMLEAK) in commit
 c7ff29763989bd09c433f73fae3c1e1c15d9cda4

Dear all,

On 24. 10. 2022. 20:56, Mirsad Goran Todorovac wrote:
> On 24. 10. 2022. 20:39, srinivas pandruvada wrote:
>
>>> Thank you for the patch. Unfortunately, when applied to v6.0.3 it
>>> didn't
>>> fix the issue.
>> Thanks for the test. I copied to acpi and acpica mailing list. Someone
>> can tell us what is this call doing wrong here. 

I have worse news: after every

# systemctl stop thermald
# systemctl start thermald

the number of leaks increases by one allocated block (apparently 80 
bytes). The effect appears to be
cummulative.

Please find the results of the MEMLEAK scan in the attachment.

In theory, motivated adversary could theoretically exhaust  i.e. 8 GiB 
in a loop of 10 million thermald stops/starts,
on my laptop and 2 sec for stop+start, it would be approx. 230 days.

Hope this helps.

Mirsad

-- 

Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
-- 
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
The European Union

View attachment "memleak-cummulative.txt" of type "text/plain" (8584 bytes)