I am getting the BUG from the subject line when trying to balance my BTRFS file system. The layout is RAID1 over four devices with varying size. I previously had some hard disk changes that went without problems. Yesterday I tried to swap a hard disk. I deleted the device from the FS, put the new HDD in and added it to the FS again. Then I ran balance to spread the chunks out again. Balance ran quite long (average speed was about half of what the hardware usually does) and hung at 2 chunks of 650ish left. The process couldn’t be canceled, paused or otherwise interacted with. I got the BUG shown below. I actually ran the balance twice, once with fairly heavy load and once without any load to the filesystem. I got the same issues in both cases. I was able to recover by cycling power and remounting with skip_balance.
Regards,
Ludger Heide
System details:
$ uname-a
Linux ludgerserver 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
$ btrfs fi show
Label: root uuid: 6c964c5f-f556-4fb5-a665-1a39b675ebae
Total devices 2 FS bytes used 16.26GiB
devid 1 size 38.63GiB used 19.03GiB path /dev/sda2
devid 2 size 38.59GiB used 19.03GiB path /dev/sdb2
Label: data uuid: 43e14dc1-5f6f-4c92-976d-ce44dff09f5d
Total devices 4 FS bytes used 650.53GiB
devid 1 size 255.07GiB used 196.00GiB path /dev/sdb5
devid 4 size 426.65GiB used 366.00GiB path /dev/sda3
devid 5 size 931.51GiB used 652.03GiB path /dev/sdd1
devid 6 size 149.05GiB used 90.03GiB path /dev/sdc1
Btrfs v3.12
$ btrfs fi df /mnt/data
Data, RAID1: total=643.00GiB, used=642.38GiB
System, RAID1: total=32.00MiB, used=128.00KiB
Metadata, RAID1: total=9.00GiB, used=8.15GiB
unknown, single: total=512.00MiB, used=0.00
[52338.892003] ------------[ cut here ]------------
[52338.892043] kernel BUG at
/build/buildd/linux-lts-utopic-3.16.0/fs/btrfs/relocation.c:3417!
[52338.892098] invalid opcode: 0000 [#1] SMP
[52338.892130] Modules linked in: vhost_net vhost macvtap macvlan xt_CHECKSUM
iptable_mangle ebtable_nat ebtables bridge stp llc nls_iso8859_1 ip6t_REJECT
xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_comment
xt_multiport xt_limit xt_tcpudp xt_addrtype ipt_MASQUERADE iptable_nat
nf_nat_ipv4 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter
ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat
nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables
snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal intel_powerclamp kvm_intel
kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64
lrw gf128mul glue_helper ablk_helper cryptd ir_lirc_codec lirc_dev
ir_mce_kbd_decoder ir_sharp_decoder ir_sanyo_decoder ir_sony_decoder
snd_hda_codec_realtek i915 snd_hda_codec_generic ir_jvc_decoder mei_me
ir_rc6_decoder mei ir_rc5_decoder ir_nec_decoder snd_hda_intel
snd_hda_controller lpc_ich snd_hda_codec drm_kms_helper drm snd_hwdep nct6775
hwmon_vid i2c_algo_bit coretemp rc_rc6_mce lp snd_soc_rt5640 nuvoton_cir
parport snd_soc_rl6231 rc_core snd_soc_core snd_compress snd_pcm_dmaengine
snd_pcm i2c_hid snd_timer hid snd soundcore dw_dmac dw_dmac_core
i2c_designware_platform video spi_pxa2xx_platform snd_soc_sst_acpi
i2c_designware_core 8250_dw mac_hid btrfs xor raid6_pq uas usb_storage e1000e
ahci ptp libahci pps_core sdhci_acpi sdhci
[52338.893143] CPU: 1 PID: 26877 Comm: btrfs Not tainted 3.16.0-38-generic
#52~14.04.1-Ubuntu
[52338.893170] Hardware name: /D54250WYB, BIOS
WYLPT10H.86A.0025.2014.0303.1008 03/03/2014
[52338.893200] task: ffff88003c7a7010 ti: ffff8800c826c000 task.ti:
ffff8800c826c000
[52338.893224] RIP: 0010:[<ffffffffc02c72d5>] [<ffffffffc02c72d5>]
__add_tree_block+0x1c5/0x1e0 [btrfs]
[52338.893270] RSP: 0018:ffff8800c826f9d0 EFLAGS: 00010202
[52338.893287] RAX: 0000000000000001 RBX: ffff8800ccaa8800 RCX: 00000000ffffffff
[52338.893310] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[52338.893333] RBP: ffff8800c826fa28 R08: ffff8800c826f98c R09: ffff8800c826f8b8
[52338.893356] R10: 0000000000000000 R11: 0000000000000b3c R12: 0000000000004000
[52338.893379] R13: ffff8800ad8b4090 R14: 0000000000000000 R15: 0000028e6c920000
[52338.893402] FS: 00007fcfcb55b880(0000) GS:ffff88011fa80000(0000)
knlGS:0000000000000000
[52338.893428] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[52338.893446] CR2: 00007ffe28fd3fe8 CR3: 00000000c823a000 CR4: 00000000001427e0
[52338.893469] Stack:
[52338.893476] ffff8800c826fac8 0000ffffc028f859 00a80000028e6c92
0000000000000040
[52338.893504] 0000000000001000 0000000000001000 0000000000003359
ffff8800ad7ee870
[52338.893531] ffff88007ae46250 ffff8800ccaa8800 00000000000000b8
ffff8800c826fa98
[52338.893558] Call Trace:
[52338.893578] [<ffffffffc02c813c>] add_data_references+0x24c/0x2e0 [btrfs]
[52338.893609] [<ffffffffc02c9313>] relocate_block_group+0x603/0x670 [btrfs]
[52338.893640] [<ffffffffc02c9556>] btrfs_relocate_block_group+0x1d6/0x2e0
[btrfs]
[52338.893674] [<ffffffffc029e91f>] btrfs_relocate_chunk.isra.27+0x6f/0x730
[btrfs]
[52338.893708] [<ffffffffc02996fb>] ? release_extent_buffer+0x2b/0xd0 [btrfs]
[52338.893739] [<ffffffffc0299b9f>] ? free_extent_buffer+0x4f/0xa0 [btrfs]
[52338.893770] [<ffffffffc02a17d3>] __btrfs_balance+0x4d3/0x8a0 [btrfs]
[52338.893799] [<ffffffffc02a1f4a>] btrfs_balance+0x3aa/0x680 [btrfs]
[52338.893829] [<ffffffffc02a94b4>] btrfs_ioctl_balance+0x164/0x520 [btrfs]
[52338.894831] [<ffffffffc02ae22c>] btrfs_ioctl+0x58c/0x2b10 [btrfs]
[52338.895822] [<ffffffff811e3fb9>] ? putname+0x29/0x40
[52338.896810] [<ffffffff811e4c2f>] ? user_path_at_empty+0x5f/0x90
[52338.897827] [<ffffffff8105af5c>] ? __do_page_fault+0x20c/0x560
[52338.898798] [<ffffffff81192fb8>] ? __vma_link_rb+0xb8/0xe0
[52338.899759] [<ffffffff811930a1>] ? vma_link+0xc1/0xd0
[52338.900709] [<ffffffff811b78b2>] ? kmem_cache_alloc+0x1b2/0x1e0
[52338.901657] [<ffffffff811e7360>] do_vfs_ioctl+0x2e0/0x4c0
[52338.902586] [<ffffffff811e75c1>] SyS_ioctl+0x81/0xa0
[52338.903496] [<ffffffff8176da4d>] system_call_fastpath+0x1a/0x1f
[52338.904384] Code: ff 48 8b 4d a8 48 8d 75 b6 4c 89 ea 48 89 df e8 52 e7 ff
ff 4c 89 ef 89 45 a8 e8 a7 8a f8 ff 8b 45 a8 e9 69 ff ff ff 85 c0 74 d6 <0f> 0b
66 0f 1f 84 00 00 00 00 00 b8 f4 ff ff ff e9 50 ff ff ff
[52338.906228] RIP [<ffffffffc02c72d5>] __add_tree_block+0x1c5/0x1e0 [btrfs]
[52338.907110] RSP <ffff8800c826f9d0>
[52338.911316] ---[ end trace d14816f3a92b021f ]---
Ludger Heide
Kaiserdamm 87
14057 Berlin
Germany
ludger.he...@lhtechnologies.de
PGP: 0x5D7EDDA9
Threema: 6SN8P3SK
+49 30 95623375
+49 170 9847562
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