Hi, my btrfs "hangs" when doing a balance operation. I'm using a 3.7.1 kernel from opensuse: linux-opzz 3.7.1-2.10-m4 #11 SMP PREEMPT Fri Jan 11 18:04:04 CET 2013 x86_64 x86_64 x86_64 GNU/Linux and Btrfs v0.19+ I did a scrub which completed without errors. Then I tried "btrfs filesystem balance /" which work fine for the first 23 of 46 chunks, then ist stopped processing further chunks, but contiued to consume large amounts of the CPU. The system logged filled quickly with messages like: [ 347.237658] btrfs: block rsv returned -28 [ 347.237661] ------------[ cut here ]------------ [ 347.237667] WARNING: at fs/btrfs/extent-tree.c:6297 btrfs_alloc_free_block+0x399/0x3a0() [ 347.237668] Hardware name: GA-MA74GM-S2H [ 347.237669] Modules linked in: fuse xt_pkttype af_packet ipt_REJECT xt_conntrack iptable_raw xt_CT iptable_filter nf _conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables cpufreq_c onservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf sp5100_tco usb_storage kvm_amd kvm snd_hda_codec_rea ltek k10temp edac_core edac_mce_amd sr_mod cdrom i2c_piix4 snd_hda_intel snd_hda_codec sg snd_hwdep snd_pcm snd_timer s nd_page_alloc floppy edd microcode autofs4 radeon ttm drm_kms_helper processor thermal_sys pata_atiixp [ 347.237694] Pid: 320, comm: btrfs-balance Not tainted 3.7.1-2.10-m4 #11 [ 347.237695] Call Trace: [ 347.237707] [<ffffffff810046c7>] dump_trace+0x87/0x2f0 [ 347.237711] [<ffffffff81591682>] dump_stack+0x69/0x6f [ 347.237716] [<ffffffff8103cb79>] warn_slowpath_common+0x79/0xc0 [ 347.237720] [<ffffffff8122c889>] btrfs_alloc_free_block+0x399/0x3a0 [ 347.237725] [<ffffffff81218617>] __btrfs_cow_block+0x137/0x550 [ 347.237728] [<ffffffff81218baf>] btrfs_cow_block+0xff/0x250 [ 347.237731] [<ffffffff8121d2f1>] btrfs_search_slot+0x421/0x980 [ 347.237735] [<ffffffff8127fa0e>] do_relocation+0x3be/0x510 [ 347.237740] [<ffffffff812839f3>] relocate_tree_blocks+0x5e3/0x610 [ 347.237743] [<ffffffff812849a4>] relocate_block_group+0x444/0x6c0 [ 347.237747] [<ffffffff81284dc9>] btrfs_relocate_block_group+0x1a9/0x2d0 [ 347.237751] [<ffffffff8125de36>] btrfs_relocate_chunk.isra.53+0x56/0x730 [ 347.237754] [<ffffffff812621fe>] btrfs_balance+0x82e/0xd50 [ 347.237758] [<ffffffff812627a0>] balance_kthread+0x80/0x90 [ 347.237762] [<ffffffff8105ec33>] kthread+0xb3/0xc0 [ 347.237766] [<ffffffff815a43fc>] ret_from_fork+0x7c/0xb0 [ 347.237770] ---[ end trace cf4d2bf19a87ec83 ]--- [ 347.239650] btrfs: block rsv returned -28 [ 347.239653] ------------[ cut here ]------------ [ 347.239658] WARNING: at fs/btrfs/extent-tree.c:6297 btrfs_alloc_free_block+0x399/0x3a0() [ 347.239660] Hardware name: GA-MA74GM-S2H [ 347.239661] Modules linked in: fuse xt_pkttype af_packet ipt_REJECT xt_conntrack iptable_raw xt_CT iptable_filter nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf sp5100_tco usb_storage kvm_amd kvm snd_hda_codec_realtek k10temp edac_core edac_mce_amd sr_mod cdrom i2c_piix4 snd_hda_intel snd_hda_codec sg snd_hwdep snd_pcm snd_timer snd_page_alloc floppy edd microcode autofs4 radeon ttm drm_kms_helper processor thermal_sys pata_atiixp [ 347.239683] Pid: 320, comm: btrfs-balance Tainted: G W 3.7.1-2.10-m4 #11 [ 347.239685] Call Trace: [ 347.239695] [<ffffffff810046c7>] dump_trace+0x87/0x2f0 [ 347.239699] [<ffffffff81591682>] dump_stack+0x69/0x6f [ 347.239704] [<ffffffff8103cb79>] warn_slowpath_common+0x79/0xc0 [ 347.239708] [<ffffffff8122c889>] btrfs_alloc_free_block+0x399/0x3a0 [ 347.239713] [<ffffffff81218617>] __btrfs_cow_block+0x137/0x550 [ 347.239716] [<ffffffff81218baf>] btrfs_cow_block+0xff/0x250 [ 347.239719] [<ffffffff8121d2f1>] btrfs_search_slot+0x421/0x980 [ 347.239723] [<ffffffff8127fa0e>] do_relocation+0x3be/0x510 [ 347.239728] [<ffffffff812839f3>] relocate_tree_blocks+0x5e3/0x610 [ 347.239731] [<ffffffff812849a4>] relocate_block_group+0x444/0x6c0 [ 347.239735] [<ffffffff81284dc9>] btrfs_relocate_block_group+0x1a9/0x2d0 [ 347.239739] [<ffffffff8125de36>] btrfs_relocate_chunk.isra.53+0x56/0x730 [ 347.239743] [<ffffffff812621fe>] btrfs_balance+0x82e/0xd50 [ 347.239746] [<ffffffff812627a0>] balance_kthread+0x80/0x90 [ 347.239750] [<ffffffff8105ec33>] kthread+0xb3/0xc0 [ 347.239755] [<ffffffff815a43fc>] ret_from_fork+0x7c/0xb0 [ 347.239758] ---[ end trace cf4d2bf19a87ec84 ]--- [ 352.352742] use_block_rsv: 146 callbacks suppressed [ 352.352750] btrfs: block rsv returned -28 [ 352.352753] ------------[ cut here ]------------ [ 352.352765] WARNING: at fs/btrfs/extent-tree.c:6297 btrfs_alloc_free_block+0x399/0x3a0() [ 352.352769] Hardware name: GA-MA74GM-S2H [ 352.352772] Modules linked in: fuse xt_pkttype af_packet ipt_REJECT xt_conntrack iptable_raw xt_CT iptable_filter nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf sp5100_tco usb_storage kvm_amd kvm snd_hda_codec_realtek k10temp edac_core edac_mce_amd sr_mod cdrom i2c_piix4 snd_hda_intel snd_hda_codec sg snd_hwdep snd_pcm snd_timer snd_page_alloc floppy edd microcode autofs4 radeon ttm drm_kms_helper processor thermal_sys pata_atiixp [ 352.352842] Pid: 320, comm: btrfs-balance Tainted: G W 3.7.1-2.10-m4 #11 [ 352.352845] Call Trace: [ 352.352872] [<ffffffff810046c7>] dump_trace+0x87/0x2f0 I have requested a cancel, but this not honoered. After re-boot, the filesystem balance operation is resumed, but hangs again: # btrfs filesystem balance status / Balance on '/' is running, cancel requested 2 out of about 5 chunks balanced (17 considered), 60% left Any idea what's going on? Thanks, Mike -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
