EXT4 -fs Warning (OpenSuse 13.1 x64)

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#1

The file system on my big server threw a warning which scares me a little bit.

Warning text:
*[1251692.004673] EXT4-fs warning (device sdb1): ext4_da_update_reserve_space:363: ino 353370121, allocated 1 with only 0 reserved metadata blocks (releasing 5 blocks with reserved 5 data blocks)
[1251692.004679] ------------ cut here ]------------
[1251692.004691] WARNING: CPU: 0 PID: 2023 at /home/abuild/rpmbuild/BUILD/kernel-default-3.11.10/linux-3.11/fs/ext4/inode.c:364 ext4_da_update_reserve_space+0x21e/0x240()
[1251692.004694] Modules linked in: fuse ufs qnx4 hfsplus hfs minix vfat msdos fat jfs xfs reiserfs xt_LOG xt_limit xt_pkttype xt_tcpudp nfsd lockd nfs_acl auth_rpcgss sunrpc oid_registry nf_conntrack_ipv6 nf_defrag_ipv6 ip6t_REJECT ipt_REJECT ip6table_raw iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables iTCO_wdt igb ptp pps_core isci libsas scsi_transport_sas ses enclosure iTCO_vendor_support shpchp gpio_ich mxm_wmi x86_pkg_temp_thermal coretemp kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel ablk_helper cryptd lrw gf128mul glue_helper aes_x86_64 ioatdma mei_me lpc_ich mei mfd_core pcspkr i2c_i801 dca wmi acpi_cpufreq mperf button joydev hid_generic
[1251692.004773] usbhid sg dm_mod autofs4 btrfs raid6_pq zlib_deflate xor libcrc32c crc32c_intel megaraid_sas mgag200 ttm drm_kms_helper drm i2c_algo_bit sysimgblt ehci_pci sysfillrect xhci_hcd ehci_hcd syscopyarea usbcore usb_common processor thermal_sys scsi_dh_emc scsi_dh_alua scsi_dh_rdac scsi_dh_hp_sw scsi_dh
[1251692.004807] CPU: 0 PID: 2023 Comm: nfsd Not tainted 3.11.10-11-default #1
[1251692.004810] Hardware name: Thomas-Krenn.AG X9DR3-F/X9DR3-F, BIOS 3.0a 07/31/2013
[1251692.004813] 0000000000000009 ffffffff8155750b 0000000000000000 ffffffff8104fb82
[1251692.004821] ffff880058aae4a8 ffff880058aae4a8 0000000000000005 0000000000000001
[1251692.004828] ffff88202cf25800 ffffffff811f25ee ffff882000000000 0000002500000005
[1251692.004834] Call Trace:
[1251692.004855] <ffffffff81004878>] dump_trace+0x78/0x2c0
[1251692.004862] <ffffffff81004b4f>] show_stack_log_lvl+0x8f/0x170
[1251692.004869] <ffffffff81005e0c>] show_stack+0x1c/0x50
[1251692.004879] <ffffffff8155750b>] dump_stack+0x41/0x51
[1251692.004889] <ffffffff8104fb82>] warn_slowpath_common+0x72/0x90
[1251692.004898] <ffffffff811f25ee>] ext4_da_update_reserve_space+0x21e/0x240
[1251692.004911] <ffffffff8121b467>] ext4_ext_map_blocks+0xb97/0xfa0
[1251692.004920] <ffffffff811f28c5>] ext4_map_blocks+0x2b5/0x520
[1251692.004927] <ffffffff811f5554>] ext4_writepages+0x514/0xc40
[1251692.004936] <ffffffff81119ad9>] __filemap_fdatawrite_range+0x49/0x50
[1251692.004942] <ffffffff81119ba0>] filemap_write_and_wait_range+0x20/0x60
[1251692.004950] <ffffffff811ed6a9>] ext4_sync_file+0xa9/0x300
[1251692.004969] <ffffffffa05e5da2>] nfsd_commit+0x92/0xb0 [nfsd]
[1251692.005014] <ffffffffa05eec45>] nfsd3_proc_commit+0x85/0xe0 [nfsd]
[1251692.005051] <ffffffffa05e0c6a>] nfsd_dispatch+0xaa/0x1f0 [nfsd]
[1251692.005080] <ffffffffa057542b>] svc_process_common+0x43b/0x680 [sunrpc]
[1251692.005130] <ffffffffa0575777>] svc_process+0x107/0x160 [sunrpc]
[1251692.005168] <ffffffffa05e069f>] nfsd+0xaf/0x120 [nfsd]
[1251692.005180] <ffffffff8106f8ef>] kthread+0xaf/0xc0
[1251692.005189] <ffffffff815654fc>] ret_from_fork+0x7c/0xb0
[1251692.005195] — end trace 60606dcc91b5f45f ]—

*Version information:
rozrhintt12:/install # uname -a
Linux rozrhintt12 3.11.10-11-default #1 SMP Mon May 12 13:37:06 UTC 2014 (3d22b5f) x86_64 x86_64 x86_64 GNU/Linux

System configuration:
2* Xeon 2500v2 2.5GHz (10 core)
128GB RAM
LSI Logic 9260 or 9270 RAID controller (with battery)

RAID config
disk 0+1: SSD boot disk (RAID 1)
disk 2-15: WD 4TB disks (RAID 6) with ext4 (~44TB capacity) → yes, we really need so much space! The volume is shared via NFS

The warning occurred while being under very light load (about 2-4 MBytes/s).
It seems that it occurred only once.

Do I have to expect data loss?
Is there a workaround or fix?

Thanks!

Jochen

#2

On 2014-06-24 15:06, jg wrote:
>
> The file system on my big server threw a warning which scares me a
> little bit.
>
> Warning text:

Just a comment:

When pasting computer commands and such, please use a CODE BLOCK, so
that the forum software doesn’t do silly things like converting URLS to
tiny urls, parenthesis into smileys, or otherwise hide or alter the
commands you entered. You get them by clicking on the ‘#’ button in the
forum editor. See photo

> Do I have to expect data loss?

It is a warning, not an error (yet?). Probably just a debug notice for
developers to see. Yes, they scare us users.

> Is there a workaround or fix?

You do not say what openSUSE version you are using. I guess it is 13.1,
though.

–
Cheers / Saludos,

Carlos E. R.
(from 13.1 x86_64 “Bottle” at Telcontar)

#3

Thanks for your fast reply!

It is a warning, not an error (yet?). Probably just a debug notice for
developers to see. Yes, they scare us users.

Seems like I have to monitor it.

You do not say what openSUSE version you are using. I guess it is 13.1,
though.

Yes it is 13.1 (x64).

#4

On 2014-06-24 16:06, jg wrote:
>
> Thanks for your fast reply!
>
>> It is a warning, not an error (yet?). Probably just a debug notice for
>> developers to see. Yes, they scare us users.
> Seems like I have to monitor it.

You could force an fsck on the partition.

–
Cheers / Saludos,

Carlos E. R.
(from 13.1 x86_64 “Bottle” at Telcontar)

#5

Good idea! Will do that, once the process is done and I can unmount the fs.

Regards
Jochen