Re: [regression] linux-6.6.y, minmax: virtual memory exhausted in i586 chroot during kernel compilation

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Feb 12, 2024 at 05:16:58PM +0100, Linux regression tracking (Thorsten Leemhuis) wrote:
> Hi Greg, Sasha, and David,
> 
> I noticed a regression report in bugzilla.kernel.org that seems to be
> specific to the linux-6.6.y series:
> 
> Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=218484 :
> 
> > After upgrading to version 6.6.16, the kernel compilation on a i586
> > arch (on a 32bit chroot in a 64bit host) fails with a message:
> > 
> > virtual memory exhausted: Cannot allocate memory
> > 
> > this happens even lowering the number of parallel compilation
> > threads. On a x86_64 arch the same problem doesn't occur. It's not
> > clear whether some weird recursion is triggered that exhausts the
> > memory, but it seems that the problem is caused by the patchset
> > 'minmax' added to the 6.6.16 version, in particular it seems caused
> > by these patches:
> > 
> > - minmax-allow-min-max-clamp-if-the-arguments-have-the-same-signedness.patch
> > - minmax-fix-indentation-of-__cmp_once-and-__clamp_once.patch
> > - minmax-allow-comparisons-of-int-against-unsigned-char-short.patch
> > - minmax-relax-check-to-allow-comparison-between-unsigned-arguments-and-signed-constants.patch
> > 
> > Reverting those patches fixes the memory exhaustion problem during compilation.
> 
> The reporter later added:
> 
> > From a quick test the same problem doesn't occur in 6.8-rc4.
> See the ticket for more details.
> 
> Note, you have to use bugzilla to reach the reporter, as I sadly[1] can
> not CCed them in mails like this.
> 
> [TLDR for the rest of this mail: I'm adding this report to the list of
> tracked Linux kernel regressions; the text you find below is based on a
> few templates paragraphs you might have encountered already in similar
> form.]
> 
> BTW, let me use this mail to also add the report to the list of tracked
> regressions to ensure it's doesn't fall through the cracks:
> 
> #regzbot introduced: 204c653d5d0c79940..9487d93f172acef
> https://bugzilla.kernel.org/show_bug.cgi?id=218484
> #regzbot title: minmax: virtual memory exhausted in 6.6.16 with i586 chroot
> #regzbot ignore-activity
> 
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> --
> Everything you wanna know about Linux kernel regression tracking:
> https://linux-regtracking.leemhuis.info/about/#tldr
> If I did something stupid, please tell me, as explained on that page.
> 
> [1] because bugzilla.kernel.org tells users upon registration their
> "email address will never be displayed to logged out users"

I think this was already fixed in 6.7 or Linus's tree, but I can't seem
to find the commit at the moment.

What file is causing the compiler to crash?  Is it some video or media
driver?

thanks,

greg k-h