linux-kernel - [btrfs] 7c7e301406: WARNING:at_fs/kernfs/dir.c:#kernfs_remove_by_name

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Message-ID: <20190701134231.GL7221@shao2-debian>
Date:   Mon, 1 Jul 2019 21:42:31 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Kimberly Brown <kimbrownkd@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Sterba <dsterba@...e.com>,
        LKML <linux-kernel@...r.kernel.org>, devel@...verdev.osuosl.org,
        lkp@...org
Subject: [btrfs] 7c7e301406:
 WARNING:at_fs/kernfs/dir.c:#kernfs_remove_by_name_ns

FYI, we noticed the following commit (built with gcc-7):

commit: 7c7e301406d0a93051d236600a72066278c2e4dc ("btrfs: sysfs: Replace default_attrs in ktypes with groups")
https://git.kernel.org/cgit/linux/kernel/git/gregkh/driver-core.git driver-core-testing

in testcase: xfstests
with following parameters:

	disk: 6HDD
	fs: btrfs
	test: btrfs-group1

test-description: xfstests is a regression test suite for xfs and other files ystems.
test-url: git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

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


+------------------------------------------------------+------------+------------+
|                                                      | d252768216 | 7c7e301406 |
+------------------------------------------------------+------------+------------+
| boot_successes                                       | 3          | 0          |
| boot_failures                                        | 20         | 32         |
| BUG:kernel_reboot-without-warning_in_test_stage      | 19         | 4          |
| BUG:kernel_NULL_pointer_dereference,address          | 1          |            |
| Oops:#[##]                                           | 1          |            |
| RIP:raid#_sse21_gen_syndrome[raid#_pq]               | 1          |            |
| Kernel_panic-not_syncing:Fatal_exception             | 1          |            |
| WARNING:at_fs/kernfs/dir.c:#kernfs_remove_by_name_ns | 0          | 28         |
| RIP:kernfs_remove_by_name_ns                         | 0          | 28         |
+------------------------------------------------------+------------+------------+


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


[  326.982029] WARNING: CPU: 1 PID: 5231 at fs/kernfs/dir.c:1505 kernfs_remove_by_name_ns+0x84/0x90
[  326.984875] Modules linked in: btrfs xor zstd_decompress zstd_compress raid6_pq libcrc32c dm_mod sr_mod cdrom crct10dif_pclmul sg crc32_pclmul crc32c_intel ata_generic pata_acpi ghash_clmulni_intel ppdev snd_pcm ata_piix aesni_intel snd_timer bochs_drm snd ttm crypto_simd drm_kms_helper cryptd joydev glue_helper libata syscopyarea sysfillrect soundcore sysimgblt serio_raw fb_sys_fops pcspkr drm i2c_piix4 floppy parport_pc parport ip_tables
[  326.996328] CPU: 1 PID: 5231 Comm: umount Not tainted 5.2.0-rc3-00058-g7c7e301406d0a #1
[  326.998371] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[  327.000473] RIP: 0010:kernfs_remove_by_name_ns+0x84/0x90
[  327.002110] Code: 00 31 c0 5b 5d 41 5c c3 48 c7 c7 20 a4 32 8b e8 d2 27 70 00 b8 fe ff ff ff 5b 5d 41 5c c3 48 c7 c7 18 8a ef 8a e8 7c 81 d4 ff <0f> 0b b8 fe ff ff ff eb d0 0f 1f 00 66 66 66 66 90 41 57 41 56 41
[  327.006665] RSP: 0018:ffffab59834bfd60 EFLAGS: 00010282
[  327.008340] RAX: 0000000000000000 RBX: ffffffffc05924b8 RCX: 0000000000000000
[  327.010327] RDX: ffff97273fd26d40 RSI: ffff97273fd17778 RDI: ffff97273fd17778
[  327.012326] RBP: ffffffffc053c818 R08: 00000000000004a1 R09: 0000000000aaaaaa
[  327.014338] R10: ffffd09d01f8bb40 R11: ffff97271c40f520 R12: ffffffffc0535000
[  327.016365] R13: ffff972678ae25e0 R14: ffff97267e10a9c8 R15: dead000000000100
[  327.018411] FS:  00007fe85f144e40(0000) GS:ffff97273fd00000(0000) knlGS:0000000000000000
[  327.020627] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  327.022473] CR2: 00000000004216d0 CR3: 000000007c81e000 CR4: 00000000000406e0
[  327.024539] Call Trace:
[  327.025934]  remove_files+0x30/0x70
[  327.027530]  sysfs_remove_group+0x3d/0x80
[  327.029104]  sysfs_remove_groups+0x29/0x40
[  327.030697]  kobject_del+0x20/0x60
[  327.032213]  btrfs_free_block_groups+0x335/0x420 [btrfs]
[  327.034019]  close_ctree+0x17a/0x300 [btrfs]
[  327.035619]  generic_shutdown_super+0x6c/0x120
[  327.037270]  kill_anon_super+0xe/0x30
[  327.038823]  btrfs_kill_super+0x12/0xa0 [btrfs]
[  327.040484]  deactivate_locked_super+0x3f/0x70
[  327.042143]  cleanup_mnt+0x3b/0x80
[  327.043655]  task_work_run+0xa3/0xe0
[  327.047924]  exit_to_usermode_loop+0xeb/0xf0
[  327.049515]  do_syscall_64+0x1a7/0x1e0
[  327.051022]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  327.052729] RIP: 0033:0x7fe85ea28d77
[  327.054183] Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f1 00 2b 00 f7 d8 64 89 01 48
[  327.058914] RSP: 002b:00007fff3462bf78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
[  327.061036] RAX: 0000000000000000 RBX: 000055c942629080 RCX: 00007fe85ea28d77
[  327.063153] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000055c942629260
[  327.065213] RBP: 000055c942629260 R08: 000055c94262a600 R09: 0000000000000015
[  327.067315] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007fe85ef2ae64
[  327.069427] R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff3462c200
[  327.071527] ---[ end trace 83bb75461b78c5f8 ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.2.0-rc3-00058-g7c7e301406d0a .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz
	bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email




Thanks,
Rong Chen


View attachment "config-5.2.0-rc3-00058-g7c7e301406d0a" of type "text/plain" (196466 bytes)

View attachment "job-script" of type "text/plain" (5451 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (40276 bytes)

View attachment "xfstests" of type "text/plain" (6681 bytes)