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

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Message-ID: <180b1a4fb9cf78c8905f275e0373e009224d4639.camel@linux.intel.com>
Date:   Wed, 26 Oct 2022 15:48:35 -0700
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>,
        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

On Wed, 2022-10-26 at 19:52 +0200, Mirsad Goran Todorovac wrote:
> 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,
Of course it needs to be debugged. To start/stop systemctl service you
need root access. If you have root access, there are other worse things
can be done.

Thanks,
Srinivas

> on my laptop and 2 sec for stop+start, it would be approx. 230 days.
> 
> Hope this helps.
> 
> Mirsad
> 
> -- 
> 
> Mirsad Goran Todorovac
> Sistem inženjer
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