linux-kernel - [proc_sysctl] 459b3085f2: sysctl_table_check

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Date:   Tue, 16 Feb 2021 20:12:11 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org, Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Christoph Hellwig <hch@....de>, Andrey Ignatov <rdna@...com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        linux-fsdevel@...r.kernel.org,
        "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
Subject: [proc_sysctl]  459b3085f2: sysctl_table_check_failed


Greeting,

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

commit: 459b3085f2dd2870cd53bfdafa6591963a5a1f21 ("proc_sysctl: clamp sizes using table->maxlen")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git Alex-Xu-Hello71/proc_sysctl-clamp-sizes-using-table-maxlen/20210215-225648


in testcase: stress-ng
version: stress-ng-x86_64-0.11-06_20210105
with following parameters:

	nr_threads: 10%
	disk: 1HDD
	testtime: 60s
	fs: ext4
	class: vm
	test: shm-sysv
	cpufreq_governor: performance
	ucode: 0x5003003



on test machine: 96 threads Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 512G memory

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>



[    3.591556] AppArmor: AppArmor initialized
[    3.613545] Dentry cache hash table entries: 16777216 (order: 15, 134217728 bytes, vmalloc)
[    3.625219] Inode-cache hash table entries: 8388608 (order: 14, 67108864 bytes, vmalloc)
[    3.626727] Mount-cache hash table entries: 262144 (order: 9, 2097152 bytes, vmalloc)
[    3.627838] Mountpoint-cache hash table entries: 262144 (order: 9, 2097152 bytes, vmalloc)
[    3.629702] sysctl table check failed: vm//stat_refresh cannot read maxlen=0
[    3.630514] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc5-00038-g459b3085f2dd #1
[    3.631513] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019
[    3.631513] Call Trace:
[    3.631513] dump_stack (kbuild/src/consumer/lib/dump_stack.c:122) 
[    3.631513] __register_sysctl_table (kbuild/src/consumer/fs/proc/proc_sysctl.c:1366) 
[    3.631513] ? register_leaf_sysctl_tables (kbuild/src/consumer/fs/proc/proc_sysctl.c:1457) 
[    3.631513] register_leaf_sysctl_tables (kbuild/src/consumer/fs/proc/proc_sysctl.c:1457) 
[    3.631513] register_leaf_sysctl_tables (kbuild/src/consumer/fs/proc/proc_sysctl.c:1482) 


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install                job.yaml  # job file is attached in this email
        bin/lkp split-job --compatible job.yaml
        bin/lkp run                    compatible-job.yaml



Thanks,
Oliver Sang


View attachment "config-5.11.0-rc5-00038-g459b3085f2dd" of type "text/plain" (173972 bytes)

View attachment "job-script" of type "text/plain" (8476 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (30492 bytes)

View attachment "stress-ng" of type "text/plain" (874 bytes)

View attachment "job.yaml" of type "text/plain" (5712 bytes)

View attachment "reproduce" of type "text/plain" (467 bytes)