The traceback paste below, and google show some bug reports,
but i don't know whether this bug resolved or not on my linux/xfs version.
[ 1266.662594] BUG: Dentry ffff8803ae02c600{i=68,n=333} still in use
(1) [unmount of xfs sdc2]
[ 1266.662705] ------------[ cut here ]------------
[ 1266.662741] kernel BUG at fs/dcache.c:891!
[ 1266.662774] invalid opcode: 0000 [#1] SMP
[ 1266.662810] Modules linked in: tcp_diag inet_diag rbd(OE)
tcm_qla2xxx_mod(OE) qla2xxx(OE) scsi_transport_fc scsi_tgt btree(OE)
tcm_loop_mod(OE) target_core_user_mod(OE) iscsi_target_mod(OE)
target_core_mod(OE) uio iptable_filter xt_conntrack nf_nat bridge stp
llc nf_conntrack_netlink nfnetlink nf_conntrack autoipv6(OE) dm_mirror
dm_region_hash dm_log dm_mod skx_edac edac_core coretemp intel_rapl
iosf_mbi kvm_intel kvm irqbypass crc32_pclmul ghash_clmulni_intel
aesni_intel lrw gf128mul glue_helper ablk_helper cryptd ses enclosure
iTCO_wdt iTCO_vendor_support sg ipmi_ssif pcspkr ipmi_si ipmi_devintf
ipmi_msghandler mei_me nfit i2c_i801 wmi mei libnvdimm shpchp lpc_ich
acpi_power_meter sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif
crct10dif_generic ast drm_kms_helper syscopyarea sysfillrect sysimgblt
[ 1266.663497] fb_sys_fops crct10dif_pclmul ttm crct10dif_common
crc32c_intel i40e drm igb mpt3sas ahci libahci libata dca ptp
i2c_algo_bit raid_class pps_core scsi_transport_sas i2c_core
[ 1266.663656] CPU: 31 PID: 13258 Comm: umount Tainted: G OE
------------ 3.10.0-693.el7.x86_64 #1
[ 1266.663725] Hardware name: XSKY XSKY XSCALER 3000/RS33M2C9S, BIOS
1.00.39 08/25/2018
[ 1266.663780] task: ffff880fa9b95ee0 ti: ffff880e41bd0000 task.ti:
ffff880e41bd0000
[ 1266.663833] RIP: 0010:[<ffffffff81218c8c>] [<ffffffff81218c8c>]
shrink_dcache_for_umount_subtree+0x1ac/0x1c0
[ 1266.663915] RSP: 0018:ffff880e41bd3e10 EFLAGS: 00010246
[ 1266.663954] RAX: 000000000000004f RBX: ffff8803ae02c600 RCX: 0000000000000000
[ 1266.664004] RDX: 0000000000000000 RSI: ffff8810391cf8b8 RDI: ffff8810391cf8b8
[ 1266.664055] RBP: ffff880e41bd3e28 R08: 0000000000000000 R09: ffff88102f52c500
[ 1266.664106] R10: 0000000000000985 R11: 0000000000000001 R12: 0000000000000083
[ 1266.664156] R13: ffffffffc049f000 R14: ffffffff81e8af50 R15: ffff880fa9b966b0
[ 1266.664208] FS: 00007f17baca0880(0000) GS:ffff8810391c0000(0000)
knlGS:0000000000000000
[ 1266.664265] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1266.664307] CR2: 00007f17ba85b074 CR3: 00000006faaec000 CR4: 00000000003407e0
[ 1266.664358] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1266.664409] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1266.664458] Stack:
[ 1266.664475] ffff88101fabc320 ffff88101fabc000 0000000000000083
ffff880e41bd3e40
[ 1266.664538] ffffffff8121aaff ffff88101fabc000 ffff880e41bd3e68
ffffffff812036c1
[ 1266.664600] ffff881032f40340 0000000000000083 ffff880fa9b95ee0
ffff880e41bd3e88
[ 1266.664662] Call Trace:
[ 1266.664691] [<ffffffff8121aaff>] shrink_dcache_for_umount+0x2f/0x60
[ 1266.664740] [<ffffffff812036c1>] generic_shutdown_super+0x21/0x100
[ 1266.664788] [<ffffffff81203b57>] kill_block_super+0x27/0x70
[ 1266.664836] [<ffffffff81203e99>] deactivate_locked_super+0x49/0x60
[ 1266.664883] [<ffffffff81204606>] deactivate_super+0x46/0x60
[ 1266.664928] [<ffffffff812216af>] cleanup_mnt+0x3f/0x80
[ 1266.664969] [<ffffffff81221742>] __cleanup_mnt+0x12/0x20
[ 1266.665013] [<ffffffff810ad265>] task_work_run+0xc5/0xf0
[ 1266.665056] [<ffffffff8102ab62>] do_notify_resume+0x92/0xb0
[ 1266.665102] [<ffffffff816b527d>] int_signal+0x12/0x17
[ 1266.665140] Code: 00 00 48 8b 40 28 4c 8b 08 48 8b 43 30 48 85 c0
74 1b 48 8b 50 40 48 89 34 24 48 c7 c7 b8 3e 91 81 48 89 de 31 c0 e8
ed 50 48 00 <0f> 0b 31 d2 eb e5 0f 0b 66 90 66 2e 0f 1f 84 00 00 00 00
00 0f
[ 1266.667389] RIP [<ffffffff81218c8c>]
shrink_dcache_for_umount_subtree+0x1ac/0x1c0
[ 1266.669435] RSP <ffff880e41bd3e10>
huang jun <hjwsm1989@xxxxxxxxx> 于2019年2月18日周一 下午11:13写道：
>
> Thank you for reply, i notice the warning message as you mentioned,
> and found that:
>
> [root@xefs-51 ~]# abrt-cli list --since 1550483811
> id 95c775cc6f18c083fb771a27accbb9a7a03e8515
> reason: BUG: Dentry ffff8803ae02c600{i=68,n=333} still in use
> (1) [unmount of xfs sdc2]
> time: 2019年02月18日 星期一 18时19分51秒
> uid: 0 (root)
> count: 1
> Directory: /var/spool/abrt/vmcore-127.0.0.1-2019-02-18-18:15:31
> 已报告： 无法报告
>
> id 224daa72a910003dceebe315d59cb9c4a2a6504e
> reason: BUG: Dentry ffff880e3f7d8540{i=6e,n=110} still in use
> (1) [unmount of xfs sdc2]
> time: 2019年02月18日 星期一 18时19分24秒
> uid: 0 (root)
> count: 1
> Directory: /var/spool/abrt/vmcore-127.0.0.1-2019-02-18-17:41:56
> 已报告： 无法报告
>
> 已禁用自动报告功能。请考虑启用该功能，方法是
> 作为有 root 特权的用户使用命令 'abrt-auto-reporting enabled'
>
> i will check this now.
>
> >
> > On Mon, Feb 18, 2019 at 07:18:20PM +0800, huang jun wrote:
> > > Hello
> > > Recently we have a problem on xfs.
> > >
> > > The environment is:
> > > CentOS Linux release 7.4.1708 (Core)
> > > Linux xefs-51 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC
> > > 2017 x86_64 x86_64 x86_64 GNU/Linux
> > >
> > > [root@xefs-51 ~]# modinfo xfs
> > > filename: /lib/modules/3.10.0-693.el7.x86_64/kernel/fs/xfs/xfs.ko.xz
> > > license: GPL
> > > description: SGI XFS with ACLs, security attributes, no debug enabled
> > > author: Silicon Graphics, Inc.
> > > alias: fs-xfs
> > > rhelversion: 7.4
> > > srcversion: 6CAAE7A01207B73522C8412
> > > depends: libcrc32c
> > > intree: Y
> > > vermagic: 3.10.0-693.el7.x86_64 SMP mod_unload modversions
> > > signer: CentOS Linux kernel signing key
> > > sig_key: DA:18:7D:CA:7D:BE:53:AB:05:BD:13:BD:0C:4E:21:F4:22:B6:A4:9C
> > > sig_hashalgo: sha256
> > >
> > > We mount /dev/sdc2 on /mnt after machine boot
> > > [root@xefs-51 ~]# df -iT /mnt/
> > > 文件系统 类型 Inode 已用(I) 可用(I) 已用(I)% 挂载点
> > > /dev/sdc2 xfs 107374144 6 107374138 1% /mnt
> > > [root@xefs-51 ~]# ls /mnt
> > > jjj kkk xfs.strace
> > >
> > > And we add files to /mnt at first,
> > > [root@xefs-51 ~]# cp /mnt/jjj /mnt/123
> > > [root@xefs-51 ~]# df -iT /mnt
> > > 文件系统 类型 Inode 已用(I) 可用(I) 已用(I)% 挂载点
> > > /dev/sdc2 xfs 107374144 7 107374137 1% /mnt
> > > [root@xefs-51 ~]# cp /mnt/jjj /mnt/111
> > > [root@xefs-51 ~]# df -iT /mnt
> > > 文件系统 类型 Inode 已用(I) 可用(I) 已用(I)% 挂载点
> > > /dev/sdc2 xfs 107374144 8 107374136 1% /mnt
> > > [root@xefs-51 ~]# cp /mnt/jjj /mnt/222
> > > [root@xefs-51 ~]# df -iT /mnt
> > > 文件系统 类型 Inode 已用(I) 可用(I) 已用(I)% 挂载点
> > > /dev/sdc2 xfs 107374144 9 107374135 1% /mnt
> > > [root@xefs-51 ~]# cp /mnt/jjj /mnt/333
> > > [root@xefs-51 ~]# df -iT /mnt
> > > 文件系统 类型 Inode 已用(I) 可用(I) 已用(I)% 挂载点
> > > /dev/sdc2 xfs 107374144 10 107374134 1% /mnt
> > >
> > > and then remove some, but the inodes used in 'df -iT /mnt' not changed
> > > [root@xefs-51 ~]# rm -f /mnt/jjj
> > > [root@xefs-51 ~]# df -iT /mnt
> > > 文件系统 类型 Inode 用(I) 可用(I) 已用(I)% 挂载点
> > > /dev/sdc2 xfs 107374144 10 107374134 1% /mnt
> > > [root@xefs-51 ~]# rm -f /mnt/kkk
> > > [root@xefs-51 ~]# df -iT /mnt
> > > 文件系统 类型 Inode 已用(I) 可用(I) 已用(I)% 挂载点
> > > /dev/sdc2 xfs 107374144 10 107374134 1% /mnt
> > >
> > > and if we umount /mnt at this time, the machine will reboot,
> > > and no related log in /var/log/messages after boot and the inodes used
> > > become normal.
> >
> > You have a filesystem that causes the machine to reboot when it is
> > unmounted? If so, you need to identify why that happens first and
> > foremost. I'd start by checking the filesystem for issues with
> > 'xfs_repair -n' after a mount cycle (to perform log recovery). After
> > that, perhaps check dmesg after each operation above before the unmount
> > to rule out any preceding errors/shutdowns putting the system in an
> > unexpected state. As for the unmount itself, I suppose you'll have to
> > find a way to get a console that shows alert output or whatnot when the
> > unmount occurs.
> >
> > Brian
> >
> > > As googled a lot, we tried some ways:
> > > 1) lsof /mnt: shows nobody use this mount point.
> > > 2) lsof |grep deleted: shows empty
> > > What should i do to find the problem out?
> > >
> > > --
> > > Thank you!
>
>
>
> --
> Thank you!
> HuangJun
--
Thank you!
HuangJun
