linux-kernel - Re: commit 1c29a32ce65f4cd0f1c causes Bad rss-counter state and firefox-esr crash in linux-next-20240613

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Message-Id: <20240614102149.f752c1609106b97ea302ccf0@linux-foundation.org>
Date: Fri, 14 Jun 2024 10:21:49 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc: Bert Karwatzki <spasswolf@....de>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: commit 1c29a32ce65f4cd0f1c causes Bad rss-counter state and
 firefox-esr crash in linux-next-20240613

On Fri, 14 Jun 2024 08:30:20 -0400 "Liam R. Howlett" <Liam.Howlett@...cle.com> wrote:

> > 
> > > (these are the error messages of several crashes and the error seems to affect
> > > other processes, too (T1))
> > > 
> > > The crash can be provoked to appear in ~1min by opening large numbers of tabs in
> > > firefox-esr (by holding pressing ctrl+t for some time). With this I bisected the
> > > error to commit "1c29a32ce65f mm/mmap: use split munmap calls for MAP_FIXED" and
> > > reverting this commit in linux-next-20240613 fixes the issue for me.
> > 
> > Thanks, that must have taken a lot of time.
> 
> Yes, thank you for all that work and apologies in creating this
> frustrating situation.
> 
> Andrew, please drop the set from your branch.  I need to write some more
> tests, but I suspect I will need to do some work around the vma_merge()
> function, which is never a fun endeavor.

Dropped, thanks.