linux-kernel - Re: [PATCH v3 0/2] iommu/iova: Make the rcache depot properly flexible

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Date: Tue, 2 Jan 2024 09:24:37 +0200
From: Ido Schimmel <idosch@...sch.org>
To: Robin Murphy <robin.murphy@....com>
Cc: joro@...tes.org, will@...nel.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, zhangzekun11@...wei.com,
	john.g.garry@...cle.com, dheerajkumar.srivastava@....com,
	jsnitsel@...hat.com
Subject: Re: [PATCH v3 0/2] iommu/iova: Make the rcache depot properly
 flexible

On Thu, Dec 28, 2023 at 02:23:20PM +0200, Ido Schimmel wrote:
> On Tue, Sep 12, 2023 at 05:28:04PM +0100, Robin Murphy wrote:
> > v2: https://lore.kernel.org/linux-iommu/cover.1692641204.git.robin.murphy@arm.com/
> > 
> > Hi all,
> > 
> > I hope this is good to go now, just fixed the locking (and threw
> > lockdep at it to confirm, which of course I should have done to begin
> > with...) and picked up tags.
> 
> Hi,
> 
> After pulling the v6.7 changes we started seeing the following memory
> leaks [1] of 'struct iova_magazine'. I'm not sure how to reproduce it,
> which is why I didn't perform bisection. However, looking at the
> mentioned code paths, they seem to have been changed in v6.7 as part of
> this patchset. I reverted both patches and didn't see any memory leaks
> when running a full regression (~10 hours), but I will repeat it to be
> sure.

FYI, we didn't see the leaks since reverting these two patches whereas
before we saw them almost everyday, so I'm quite sure they introduced
the leaks.

Thanks