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Subject: Re: [init/initramfs.c] e7cb072eb9: invoked_oom-killer:gfp_mask=0x
To:     Oliver Sang <oliver.sang@intel.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Jessica Yu <jeyu@kernel.org>, Borislav Petkov <bp@alien8.de>,
        Jonathan Corbet <corbet@lwn.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Takashi Iwai <tiwai@suse.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org,
        lkp@intel.com
References: <20210607144419.GA23706@xsang-OptiPlex-9020>
 <d28354fd-0f72-559d-771f-fb2a80b51b05@rasmusvillemoes.dk>
 <20210611084817.GB26476@xsang-OptiPlex-9020>
From:   Rasmus Villemoes <linux@rasmusvillemoes.dk>
Message-ID: <f53c0e44-c0c0-8631-50c5-1c5bb549c629@rasmusvillemoes.dk>
Date:   Mon, 21 Jun 2021 19:02:05 +0200
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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