linux-kernel - Re: [init/initramfs.c] e7cb072eb9: invoked_oom-killer:gfp

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Date:   Mon, 21 Jun 2021 19:02:05 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Oliver Sang <oliver.sang@...el.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Jessica Yu <jeyu@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Takashi Iwai <tiwai@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Re: [init/initramfs.c] e7cb072eb9: invoked_oom-killer:gfp_mask=0x

On 11/06/2021 10.48, Oliver Sang wrote:

>>> To reproduce:
>>>
>>>         # build kernel
>>> 	cd linux
>>> 	cp config-5.12.0-11533-ge7cb072eb988 .config
>>> 	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
>>> 	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
>>> 	cd <mod-install-dir>
>>> 	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz

Hm, when I do this with that exact commit, config, command lines and
Ubuntu's idea of what gcc-9 is, I get a modules.cgz of 73MB,
decompressing to 215MB. But in the two dmesg captures you've sent, there
are lines

[    0.016519] RAMDISK: [mem 0x74c12000-0x7fffffff]
[    0.023424] RAMDISK: [mem 0x74c16000-0x7fffffff]

corresponding to 189MB compressed. I'm wondering why there is the huge
difference.

Artificially inflating my modules.cgz to around the same size ("cp -r
lib/modules lib/modules2; cp -r lib/modules lib/modules3;") doesn't help
reproduce, unfortunately.

Rasmus