New subject: [Bug 751679] btrfs filesystem balance results in bug in /home/abuild/rpmbuild/BUILD/kernel-desktop-3.1.9/linux-3.1/fs/btrfs/relocation.c:3787 relocate_block_group+0x4a6/0x560 [btrfs]()

12 Mar 2012

      https://bugzilla.novell.com/show_bug.cgi?id=751679

https://bugzilla.novell.com/show_bug.cgi?id=751679#c0

           Summary: btrfs filesystem balance results in bug in
                    /home/abuild/rpmbuild/BUILD/kernel-desktop-3.1.9/linux
                    -3.1/fs/btrfs/relocation.c:3787
                    relocate_block_group+0x4a6/0x560 [btrfs]()
    Classification: openSUSE
           Product: openSUSE 12.1
           Version: Final
          Platform: x86-64
        OS/Version: openSUSE 12.1
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Kernel
        AssignedTo: kernel-maintainers@forge.provo.novell.com
        ReportedBy: guido.juckeland@tu-dresden.de
         QAContact: qa@suse.de
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.11 (KHTML,
like Gecko) Chrome/17.0.963.78 Safari/535.11

Whenever I try to rebalance my root-fs (which is btrfs) I see a number of the
following bugs via syslog:

Mar 10 21:08:43 denkbrett kernel: [70267.675658] ------------[ cut here
]------------
Mar 10 21:08:43 denkbrett kernel: [70267.675705] WARNING: at
/home/abuild/rpmbuild/BUILD/kernel-desktop-3.1.9/linux-3.1/fs/btrfs/relocation.c:3787
relocate_block_group+0x4a6/0x560 [btrfs]()
Mar 10 21:08:43 denkbrett kernel: [70267.675707] Hardware name: 3323REG
Mar 10 21:08:43 denkbrett kernel: [70267.675708] Modules linked in: qcserial
usb_wwan usbserial nls_iso8859_1 nls_cp437 vfat fat ip6t_LOG xt_tcpudp
xt_pkttype ipt_LOG xt_limit af_packet rfcomm bnep vboxpci vboxnetadp vboxnetflt
vboxdrv ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw xt_NOTRACK
ipt_REJECT iptable_raw 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 cpufreq_conservative
cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf microcode binfmt_misc
snd_hda_codec_hdmi snd_hda_codec_conexant ecb hdj_mod uvcvideo videodev
snd_rawmidi snd_seq_device sr_mod arc4 snd_hda_intel btusb v4l2_compat_ioctl32
snd_hda_codec snd_hwdep snd_pcm bluetooth thinkpad_acpi cdrom snd_timer
iTCO_wdt snd sg iwlagn i2c_i801 mac80211 mei(C) pcspkr soundcore tpm_tis
intel_ips cfg80211 rfkill tpm tpm_bios snd_page_alloc iTCO_vendor_support ac
battery e1000e wmi autofs4 btrfs zlib_deflate i9
Mar 10 21:08:43 denkbrett kernel: 15 drm_kms_helper drm i2c_algo_bit thermal
button video processor thermal_sys [last unloaded: usbserial]
Mar 10 21:08:43 denkbrett kernel: [70267.675754] Pid: 5306, comm: btrfs
Tainted: G        WC  3.1.9-1.4-desktop #1
Mar 10 21:08:43 denkbrett kernel: [70267.675755] Call Trace:
Mar 10 21:08:43 denkbrett kernel: [70267.675768]  [<ffffffff810043fa>]
dump_trace+0xaa/0x2b0
Mar 10 21:08:43 denkbrett kernel: [70267.675775]  [<ffffffff815843d3>]
dump_stack+0x69/0x6f
Mar 10 21:08:43 denkbrett kernel: [70267.675781]  [<ffffffff8105390b>]
warn_slowpath_common+0x7b/0xc0
Mar 10 21:08:43 denkbrett kernel: [70267.675792]  [<ffffffffa01aae66>]
relocate_block_group+0x4a6/0x560 [btrfs]
Mar 10 21:08:43 denkbrett kernel: [70267.675870]  [<ffffffffa01ab0e3>]
btrfs_relocate_block_group+0x1c3/0x300 [btrfs]
Mar 10 21:08:43 denkbrett kernel: [70267.675943]  [<ffffffffa018a69b>]
btrfs_relocate_chunk.isra.45+0x4b/0x420 [btrfs]
Mar 10 21:08:43 denkbrett kernel: [70267.676001]  [<ffffffffa018dc6f>]
btrfs_balance+0x1df/0x270 [btrfs]
Mar 10 21:08:43 denkbrett kernel: [70267.676059]  [<ffffffffa01959f0>]
btrfs_ioctl+0x590/0x6e0 [btrfs]
Mar 10 21:08:43 denkbrett kernel: [70267.676190]  [<ffffffff811653e5>]
do_vfs_ioctl+0x85/0x2e0
Mar 10 21:08:43 denkbrett kernel: [70267.676196]  [<ffffffff811656d8>]
sys_ioctl+0x98/0xa0
Mar 10 21:08:43 denkbrett kernel: [70267.676201]  [<ffffffff815a4c12>]
system_call_fastpath+0x16/0x1b
Mar 10 21:08:43 denkbrett kernel: [70267.676207]  [<00007f5b81a5dd67>]
0x7f5b81a5dd66
Mar 10 21:08:43 denkbrett kernel: [70267.676209] ---[ end trace
bb88747ca473d205 ]---

I did the rebalance hoping that I could gain some room on my rather small SSD:
denkbrett:~ # df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs           21G   19G  404M  98% /
..
/dev/sda3        21G   19G  404M  98% /
..
/dev/sda1       197M   31M  157M  17% /boot
/dev/sda4        98G   87G  9.8G  90% /home

The command seems to run fine, but the bugs appear in syslog. Also the result
is not really convincing. I had hoped to gain some more space...

Reproducible: Always

Steps to Reproduce:
1. run "btrfs filesystem balance /" on a btrfs rootfs

Actual Results:  
command runs but above mentioned kernel bugs appear

Expected Results:  
no kernel bugs

--- Comment #1 from David Sterba  2012-03-12 13:45:58 CET ---
*** Bug 751688 has been marked as a duplicate of this bug. *** http://bugzilla.novell.com/show_bug.cgi?id=751688

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[Bug 751679] New: btrfs filesystem balance results in bug in /home/abuild/rpmbuild/BUILD/kernel-desktop-3.1.9/linux-3.1/fs/btrfs/relocation.c:3787 relocate_block_group+0x4a6/0x560 [btrfs]()

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