Hello,
Using BTRFS on CentOS 7, I get the filesystem hung by running
btrfs quota rescan /mnt/btrfs/
After that I could not access to the filesystem anymore until system restart.
I did the scan because BTRFS suggested it:
[root@nex-dstrg-ctrl-1 btrfs]# btrfs qgroup show -F /mnt/btrfs/
WARNING: Qgroup data inconsistent, rescan recommended
qgroupid rfer excl
-------- ---- ----
0/5 27.91GiB 27.91GiB
[root@nex-dstrg-ctrl-1 ~]# btrfs qgroup show -pcre /mnt/btrfs/
WARNING: Qgroup data inconsistent, rescan recommended
qgroupid rfer excl max_rfer max_excl parent child
-------- ---- ---- -------- -------- ------ -----
0/5 27.91GiB 27.91GiB 0.00B 0.00B --- ---
0/389 9.77GiB 9.77GiB 0.00B 0.00B --- ---
0/391 16.00KiB 16.00KiB 10.00GiB 0.00B --- ---
0/525 9.99GiB 0.00B 0.00B 0.00B --- ---
0/599 16.00KiB 16.00KiB 2.00GiB 0.00B --- ---
dmesg output:
[154385.628385] INFO: task btrfs:22324 blocked for more than 120 seconds.
[154385.629044] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[154385.629648] btrfs D ffff881fc3bdef20 0 22324 3677 0x00000080
[154385.629652] ffff88114d01bc60 0000000000000082 ffff880e2fecae00 ffff88114d01bfd8
[154385.629656] ffff88114d01bfd8 ffff88114d01bfd8 ffff880e2fecae00 ffff881fc3be1100
[154385.629658] ffff883fc826c9f0 ffff883fc826c9f0 0000000000000001 ffff881fc3bdef20
[154385.629661] Call Trace:
[154385.629673] [<ffffffff8163a889>] schedule+0x29/0x70
[154385.629690] [<ffffffffa0707117>] wait_current_trans.isra.20+0xe7/0x130 [btrfs]
[154385.629696] [<ffffffff810a6ae0>] ? wake_up_atomic_t+0x30/0x30
[154385.629704] [<ffffffffa07089b8>] start_transaction+0x2b8/0x5a0 [btrfs]
[154385.629711] [<ffffffffa0708cf7>] btrfs_join_transaction+0x17/0x20 [btrfs]
[154385.629722] [<ffffffffa0771569>] btrfs_qgroup_rescan+0x39/0x90 [btrfs]
[154385.629731] [<ffffffffa0741d22>] btrfs_ioctl+0x20b2/0x2b70 [btrfs]
[154385.629736] [<ffffffff811d1552>] ? __mem_cgroup_commit_charge+0x152/0x390
[154385.629740] [<ffffffff81177d5e>] ? lru_cache_add+0xe/0x10
[154385.629745] [<ffffffff811a1af1>] ? page_add_new_anon_rmap+0x91/0x130
[154385.629750] [<ffffffff81197290>] ? handle_mm_fault+0x7c0/0xf50
[154385.629752] [<ffffffff8119bb98>] ? __vma_link_rb+0xb8/0xe0
[154385.629759] [<ffffffff811f1e85>] do_vfs_ioctl+0x2e5/0x4c0
[154385.629765] [<ffffffff8128bbfe>] ? file_has_perm+0xae/0xc0
[154385.629769] [<ffffffff81640d01>] ? __do_page_fault+0xb1/0x450
[154385.629771] [<ffffffff811f2101>] SyS_ioctl+0xa1/0xc0
[154385.629776] [<ffffffff816458c9>] system_call_fastpath+0x16/0x1b
Additional Info:
[root@nex-dstrg-ctrl-1 ~]# modinfo btrfs
filename: /lib/modules/3.10.0-327.3.1.el7.x86_64/kernel/fs/btrfs/btrfs.ko
license: GPL
alias: devname:btrfs-control
alias: char-major-10-234
alias: fs-btrfs
rhelversion: 7.2
srcversion: B92059408E7CB90AE2D9A2F
depends: raid6_pq,xor,zlib_deflate
intree: Y
vermagic: 3.10.0-327.3.1.el7.x86_64 SMP mod_unload modversions
signer: CentOS Linux kernel signing key
sig_key: 3D:4E:71:B0:42:9A:39:8B:8B:78:3B:6F:8B:ED:3B:AF:09:9E:E9:A7
sig_hashalgo: sha256
[root@nex-dstrg-ctrl-1 ~]# btrfs filesystem show /mnt/btrfs/
Label: none uuid: 6289b7b3-ba25-4c9e-af95-4a5fb18eeea1
Total devices 12 FS bytes used 29.86GiB
devid 1 size 894.13GiB used 4.52GiB path /dev/md101
devid 2 size 894.13GiB used 4.52GiB path /dev/md102
devid 3 size 894.13GiB used 4.52GiB path /dev/md103
devid 4 size 894.13GiB used 4.52GiB path /dev/md104
devid 5 size 894.13GiB used 4.52GiB path /dev/md105
devid 6 size 894.13GiB used 4.52GiB path /dev/md106
devid 7 size 894.13GiB used 4.52GiB path /dev/md107
devid 8 size 894.13GiB used 4.52GiB path /dev/md108
devid 9 size 894.13GiB used 4.52GiB path /dev/md109
devid 10 size 894.13GiB used 4.52GiB path /dev/md110
devid 11 size 894.13GiB used 4.52GiB path /dev/md111
devid 12 size 894.13GiB used 4.52GiB path /dev/md112
btrfs-progs v3.19.1
[root@nex-dstrg-ctrl-1 ~]# btrfs quota rescan -s /mnt/btrfs/
rescan operation running (current key 0)
[root@nex-dstrg-ctrl-1 ~]# btrfs subvolume list /mnt/btrfs/
ID 389 gen 10663 top level 5 path vol0
ID 391 gen 10514 top level 5 path vol1
ID 599 gen 10664 top level 5 path CLOUD_SSD_02
I'm just starting with BTRFS so I could be doing something wrong! Any ideas?
Best regards,
Xavier Romero
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