linux-kernel - [debugfs] 56348560d4: kmsg.UBI_error:cannot_initialize

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Message-ID: <20220311091346.GH18612@xsang-OptiPlex-9020>
Date:   Fri, 11 Mar 2022 17:13:46 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        stable <stable@...r.kernel.org>,
        Michael Walle <michael@...le.cc>,
        Marc Zyngier <maz@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: [debugfs]  56348560d4: kmsg.UBI_error:cannot_initialize_UBI,error



Greeting,

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

commit: 56348560d495d2501e87db559a61de717cd3ab02 ("debugfs: do not attempt to create a new file before the filesystem is initalized")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

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




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


[   22.678378][    T1] UBI error: cannot create "ubi" debugfs directory, error -2
[   22.679890][    T1] UBI error: cannot initialize UBI, error -2



To reproduce:

        # build kernel
	cd linux
	cp config-5.11.0-rc5-00034-g56348560d495 .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

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.



---
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-5.11.0-rc5-00034-g56348560d495" of type "text/plain" (135191 bytes)

View attachment "job-script" of type "text/plain" (4658 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (11164 bytes)