linux-kernel - [mm, slab/slub] 7b39adbb1b: WARNING:at_mm/slab.h:#kmem_cache

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Date:   Tue, 23 Jun 2020 17:02:13 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Kees Cook <keescook@...omium.org>,
        Roman Gushchin <guro@...com>, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Matthew Garrett <mjg59@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Vijayanand Jitta <vjitta@...eaurora.org>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: [mm, slab/slub] 7b39adbb1b: WARNING:at_mm/slab.h:#kmem_cache_free

Greeting,

FYI, we noticed the following commit (built with gcc-6):

commit: 7b39adbb1b1d3e73df9066a8d1e93a83c18d7730 ("mm, slab/slub: improve error reporting and overhead of cache_from_obj()")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: boot

on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+--------------------------------------------------------+------------+------------+
|                                                        | 5a2a0a5f04 | 7b39adbb1b |
+--------------------------------------------------------+------------+------------+
| boot_successes                                         | 4          | 0          |
| boot_failures                                          | 4          | 8          |
| WARNING:at_kernel/trace/trace.c:#trace_find_next_entry | 4          | 4          |
| EIP:trace_find_next_entry                              | 4          | 4          |
| WARNING:at_mm/slab.h:#kmem_cache_free                  | 0          | 8          |
| EIP:kmem_cache_free                                    | 0          | 8          |
+--------------------------------------------------------+------------+------------+


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


[    3.251054] WARNING: CPU: 0 PID: 8 at mm/slab.h:298 kmem_cache_free+0x5/0x170
[    3.251054] Modules linked in:
[    3.251054] CPU: 0 PID: 8 Comm: kdevtmpfs Not tainted 5.8.0-rc1-00277-g7b39adbb1b1d3 #1
[    3.251054] EIP: kmem_cache_free+0x5/0x170
[    3.251054] Code: 9f 8c 89 f8 e8 cc 58 fd ff 0f 0b 8d 78 ff e9 77 ff ff ff e8 2d d3 90 00 8d b4 26 00 00 00 00 8d b6 00 00 00 00 66 66 66 66 90 <0f> 0b 85 c0 0f 84 a6 00 00 00 8b 0d 64 50 b7 8c 85 c9 0f 84 33 01
[    3.251054] EAX: 80090780 EBX: 802b4000 ECX: 00000000 EDX: 802b4000
[    3.251054] ESI: 802b4000 EDI: 80305e04 EBP: 80305df4 ESP: 80305dec
[    3.251054] DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068 EFLAGS: 00010246
[    3.251054] CR0: 80050033 CR2: ffffffff CR3: 0ceb2000 CR4: 000406b0
[    3.251054] Call Trace:
[    3.251054]  ? putname+0x5c/0x60
[    3.251054]  filename_lookup+0xde/0x1a0
[    3.251054]  ? rcu_read_lock_sched_held+0x20/0x50
[    3.251054]  ? strncpy_from_user+0x21/0x1a0
[    3.251054]  user_path_at_empty+0x2a/0x40
[    3.251054]  do_mount+0x5d/0x9b0
[    3.251054]  devtmpfsd+0x69/0x2c0
[    3.251054]  ? sched_clock_cpu+0x44/0xc0
[    3.251054]  ? _raw_spin_unlock_irqrestore+0x2a/0x72
[    3.251054]  ? trace_hardirqs_on+0xbf/0x270
[    3.251054]  ? __kthread_parkme+0x5a/0x80
[    3.251054]  kthread+0xf0/0x120
[    3.251054]  ? public_dev_mount+0x40/0x40
[    3.251054]  ? kthread_create_worker_on_cpu+0x20/0x20
[    3.251054]  ret_from_fork+0x19/0x30
[    3.251054] irq event stamp: 41
[    3.251054] hardirqs last  enabled at (41): [<8ba11885>] set_root+0x95/0x190
[    3.251054] hardirqs last disabled at (40): [<8ba11856>] set_root+0x66/0x190
[    3.251054] softirqs last  enabled at (0): [<8b87027b>] copy_process+0x3eb/0x15b0
[    3.251054] softirqs last disabled at (0): [<00000000>] 0x0
[    3.251054] ---[ end trace e72be312a52f9020 ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.8.0-rc1-00277-g7b39adbb1b1d3 .config
	make HOSTCC=gcc-6 CC=gcc-6 ARCH=i386 olddefconfig prepare modules_prepare bzImage

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



Thanks,
Rong Chen


View attachment "config-5.8.0-rc1-00277-g7b39adbb1b1d3" of type "text/plain" (101643 bytes)

View attachment "job-script" of type "text/plain" (4690 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (17020 bytes)