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

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Date:   Mon, 7 Jun 2021 22:44:19 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
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: [init/initramfs.c]  e7cb072eb9: invoked_oom-killer:gfp_mask=0x



Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: e7cb072eb988e46295512617c39d004f9e1c26f8 ("init/initramfs.c: do unpacking asynchronously")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master


in testcase: locktorture
version: 
with following parameters:

	runtime: 300s
	test: cpuhotplug

test-description: This torture test consists of creating a number of kernel threads which acquire the lock and hold it for specific amount of time, thus simulating different critical region behaviors.
test-url: https://www.kernel.org/doc/Documentation/locking/locktorture.txt


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


please be noted that we use 'vmalloc=512M' for both parent and this commit.
since it's ok on parent but oom on this commit, we want to send this report
to show the potential problem of the commit on some cases.

we also tested by changing to use 'vmalloc=128M', it will succeed.


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>


[    4.443950] e1000: Copyright (c) 1999-2006 Intel Corporation.
[    4.716374] ACPI: _SB_.LNKC: Enabled at IRQ 11
[    5.081518] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 52:54:00:12:34:56
[    5.082999] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection
[    5.085275] VFIO - User Level meta-driver version: 0.3
[    8.029204] kworker/u4:0 invoked oom-killer: gfp_mask=0x100cc0(GFP_USER), order=0, oom_score_adj=0
[    8.031021] CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.12.0-11533-ge7cb072eb988 #1
[    8.031988] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[    8.031988] Workqueue: events_unbound async_run_entry_fn
[    8.031988] Call Trace:
[    8.031988] dump_stack (kbuild/src/consumer/lib/dump_stack.c:122) 
[    8.031988] dump_header (kbuild/src/consumer/mm/oom_kill.c:463) 
[    8.031988] ? lock_release (kbuild/src/consumer/kernel/locking/lockdep.c:5190 kbuild/src/consumer/kernel/locking/lockdep.c:5532) 
[    8.031988] ? out_of_memory (kbuild/src/consumer/include/linux/rcupdate.h:710 kbuild/src/consumer/mm/oom_kill.c:379 kbuild/src/consumer/mm/oom_kill.c:1102 kbuild/src/consumer/mm/oom_kill.c:1048) 
[    8.031988] out_of_memory.cold (kbuild/src/consumer/mm/oom_kill.c:1106 kbuild/src/consumer/mm/oom_kill.c:1048) 


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


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang


View attachment "config-5.12.0-11533-ge7cb072eb988" of type "text/plain" (144792 bytes)

View attachment "job-script" of type "text/plain" (4290 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (11324 bytes)