[cc linux-xfs@xxxxxxxxxxxxxxx] On Fri, Dec 08, 2017 at 06:42:32AM +0530, Dinesh Pathak wrote: > Hi, We are mounting and traversing one backup of a VM with XFS filesystem. > Sometimes during traversing, the process goes into D state and can not be > killed. Eventually system needs to IPMI rebooted. This happens once in 100 > times. > > This VM backup is kept on NFS storage. So we first do NFS mounting. Then do > loopback mount of the partition which contain XFS. After that we traverse > the file system, but this traversing is not necessarily multi threaded (We > have seen the issue in both single-threaded and multi-threaded traversal) > > I see a similar problem reported here: https://access.redhat.com/ > solutions/2456711 > The resolution given here is to upgrade the linux kernel to > kernel-3.10.0-514.el7 RHSA-2016-2574 > <https://rhn.redhat.com/errata/RHSA-2016-2574.html> RHEL7.3. Upgrading the > kernel may not be possible for us. Is there any patch/patches that we can > apply to fix this issue. Oh, it's RHEL kernel. This is not a mainline kernel so you need to report this to your local Red Hat support engineer rather than to upstream kernel lists. -Dave. > One more thread here says that this issue is fixed only in the above kernel > version. It is seen in previous as well as later versions. > https://bugs.centos.org/view.php?id=13843&history=1 > > Is there anyway to reproduce this problem. All our efforts to reproduce > this issue have not succeeded. > > Please help me know if any more debugging can be done. > > Thanks, > Dinesh > > Kernel version of source VM, whose backup is taken. > > root@web-2318 ~]# uname -a > > Linux web-2318.website.oxilion.nl 3.10.0-514.26.2.el7.x86_64 #1 SMP Tue Jul > 4 15:04:05 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux > > > Kernel version of the machine where backup is mounted and traversed. > 3.10.0-327.22.2.el7.x86_64 #1 SMP Tue Jul 5 12:41:09 PDT 2016 x86_64 x86_64 > x86_64 GNU/Linux > > > Mon Dec 4 21:08:21 2017] yoda_exec D 0000000000000000 0 48948 48938 > 0x00000000 > > [Mon Dec 4 21:08:21 2017] ffff8801052437b0 0000000000000086 > ffff88000aa02e00 ffff880105243fd8 > > [Mon Dec 4 21:08:21 2017] ffff880105243fd8 ffff880105243fd8 > ffff88000aa02e00 ffff88010521e730 > > [Mon Dec 4 21:08:21 2017] 7fffffffffffffff ffff88000aa02e00 > 0000000000000002 0000000000000000 > > [Mon Dec 4 21:08:21 2017] Call Trace: > > [Mon Dec 4 21:08:21 2017] [<ffffffff8163b7f9>] schedule+0x29/0x70 > > [Mon Dec 4 21:08:21 2017] [<ffffffff816394e9>] > schedule_timeout+0x209/0x2d0 > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07a2e67>] ? > xfs_iext_bno_to_ext+0xa7/0x1a0 [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffff8163ab22>] __down_common+0xd2/0x14a > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07b00cd>] ? > _xfs_buf_find+0x16d/0x2c0 [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffff8163abb7>] __down+0x1d/0x1f > > [Mon Dec 4 21:08:21 2017] [<ffffffff810ab921>] down+0x41/0x50 > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07afecc>] xfs_buf_lock+0x3c/0xd0 > [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07b00cd>] _xfs_buf_find+0x16d/0x2c0 > [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07b024a>] xfs_buf_get_map+0x2a/0x180 > [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07b0d2c>] > xfs_buf_read_map+0x2c/0x140 [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07dd829>] > xfs_trans_read_buf_map+0x199/0x400 [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa0790204>] xfs_da_read_buf+0xd4/0x100 > [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa0790253>] > xfs_da3_node_read+0x23/0xd0 [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffff811c153a>] ? > kmem_cache_alloc+0x1ba/0x1d0 > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07914ce>] > xfs_da3_node_lookup_int+0x6e/0x2f0 [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa079bded>] > xfs_dir2_node_lookup+0x4d/0x170 > [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07937b5>] xfs_dir_lookup+0x195/0x1b0 > [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07c1bb6>] xfs_lookup+0x66/0x110 [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffffa07bea0b>] xfs_vn_lookup+0x7b/0xd0 > [xfs] > > [Mon Dec 4 21:08:21 2017] [<ffffffff811e8cad>] lookup_real+0x1d/0x50 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811e9622>] __lookup_hash+0x42/0x60 > > [Mon Dec 4 21:08:21 2017] [<ffffffff8163342b>] lookup_slow+0x42/0xa7 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811ee4f3>] path_lookupat+0x773/0x7a0 > > [Mon Dec 4 21:08:21 2017] [<ffffffff81186f6a>] ? kvfree+0x2a/0x40 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811c13b5>] ? > kmem_cache_alloc+0x35/0x1d0 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811ef1ef>] ? getname_flags+0x4f/0x1a0 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811ee54b>] filename_lookup+0x2b/0xc0 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811f0317>] > user_path_at_empty+0x67/0xc0 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811f0381>] user_path_at+0x11/0x20 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811e3bc3>] vfs_fstatat+0x63/0xc0 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811e4191>] SYSC_newlstat+0x31/0x60 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811f27fc>] ? vfs_readdir+0x8c/0xe0 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811f2cad>] ? SyS_getdents+0xfd/0x120 > > [Mon Dec 4 21:08:21 2017] [<ffffffff811e441e>] SyS_newlstat+0xe/0x10 > > [Mon Dec 4 21:08:21 2017] [<ffffffff81646889>] > system_call_fastpath+0x16/0x1b -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
