On Tue, Nov 08, 2016 at 08:43:34AM +0800, Qu Wenruo wrote:
> That's strange, balance is done completely in kernel space.
>
> Unless we're calling vfs_* function we won't go through the extra check.
>
> What's the error reported?
See below. Note however that is may be because btrfs received messed up the
filesystem first.
BTRFS info (device dm-0): use zlib compression
BTRFS info (device dm-0): disk space caching is enabled
BTRFS info (device dm-0): has skinny extents
BTRFS info (device dm-0): bdev /dev/mapper/crypt_bcache0 errs: wr 0, rd 0, flush 0, corrupt 512, gen 0
BTRFS info (device dm-0): detected SSD devices, enabling SSD mode
BTRFS info (device dm-0): continuing balance
BTRFS info (device dm-0): The free space cache file (1593999097856) is invalid. skip it
BTRFS info (device dm-0): The free space cache file (1671308509184) is invalid. skip it
BTRFS info (device dm-0): relocating block group 13835461197824 flags 34
------------[ cut here ]------------
WARNING: CPU: 0 PID: 22825 at fs/btrfs/disk-io.c:520 btree_csum_one_bio.isra.39+0xf7/0x100
Modules linked in: bcache configs rc_hauppauge ir_kbd_i2c cpufreq_userspace cpufreq_powersave cpufreq_conservative autofs4 snd_hda_codec_hdmi joydev snd_hda_codec_realtek snd_hda_codec_generic tuner_simple tuner_types tda9887 snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep tda8290 coretemp snd_pcm_oss snd_mixer_oss tuner snd_pcm msp3400 snd_seq_midi snd_seq_midi_event firewire_sbp2 saa7127 snd_rawmidi hwmon_vid dm_crypt dm_mod saa7115 snd_seq bttv hid_generic snd_seq_device snd_timer ehci_pci ivtv tea575x videobuf_dma_sg rc_core videobuf_core input_leds tveeprom cx2341x v4l2_common ehci_hcd videodev media acpi_cpufreq tpm_tis tpm_tis_core gpio_ich snd soundcore tpm psmouse lpc_ich evdev asus_atk0110 serio_raw lp parport raid456 async_raid6_recov async_pq async_xor async_memcpy async_tx multipath usbhid hid sr_mod cdrom sg firewire_ohci firewire_core floppy crc_itu_t i915 atl1 fjes mii uhci_hcd usbcore usb_common
CPU: 0 PID: 22825 Comm: kworker/u9:2 Tainted: G W 4.8.5-ia32-20161028 #2
Hardware name: System manufacturer P5E-VM HDMI/P5E-VM HDMI, BIOS 0604 07/16/2008
Workqueue: btrfs-worker-high btrfs_worker_helper
00200286 00200286 d3d81e48 df414827 00000000 dfa12da5 d3d81e78 df05677a
df9ed884 00000000 00005929 dfa12da5 00000208 df2cf067 00000208 f7463fa0
f401a080 00000000 d3d81e8c df05684a 00000009 00000000 00000000 d3d81eb4
Call Trace:
[<df414827>] dump_stack+0x58/0x81
[<df05677a>] __warn+0xea/0x110
[<df2cf067>] ? btree_csum_one_bio.isra.39+0xf7/0x100
[<df05684a>] warn_slowpath_null+0x2a/0x30
[<df2cf067>] btree_csum_one_bio.isra.39+0xf7/0x100
[<df2cf085>] __btree_submit_bio_start+0x15/0x20
[<df2cdd10>] run_one_async_start+0x30/0x40
[<df31286d>] btrfs_scrubparity_helper+0xcd/0x2d0
[<df2cde70>] ? run_one_async_free+0x20/0x20
[<df312bbd>] btrfs_worker_helper+0xd/0x10
[<df06d05b>] process_one_work+0x10b/0x400
[<df06d387>] worker_thread+0x37/0x4b0
[<df06d350>] ? process_one_work+0x400/0x400
[<df0722db>] kthread+0x9b/0xb0
[<df799922>] ret_from_kernel_thread+0xe/0x24
[<df072240>] ? kthread_stop+0x100/0x100
---[ end trace f461faff989bf258 ]---
BTRFS: error (device dm-0) in btrfs_commit_transaction:2232: errno=-5 IO failure (Error while writing out transaction)
BTRFS info (device dm-0): forced readonly
BTRFS warning (device dm-0): Skipping commit of aborted transaction.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 22318 at fs/btrfs/transaction.c:1854 btrfs_commit_transaction+0x2f5/0xcc0
BTRFS: Transaction aborted (error -5)
Modules linked in: bcache configs rc_hauppauge ir_kbd_i2c cpufreq_userspace cpufreq_powersave cpufreq_conservative autofs4 snd_hda_codec_hdmi joydev snd_hda_codec_realtek snd_hda_codec_generic tuner_simple tuner_types tda9887 snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep tda8290 coretemp snd_pcm_oss snd_mixer_oss tuner snd_pcm msp3400 snd_seq_midi snd_seq_midi_event firewire_sbp2 saa7127 snd_rawmidi hwmon_vid dm_crypt dm_mod saa7115 snd_seq bttv hid_generic snd_seq_device snd_timer ehci_pci ivtv tea575x videobuf_dma_sg rc_core videobuf_core input_leds tveeprom cx2341x v4l2_common ehci_hcd videodev media acpi_cpufreq tpm_tis tpm_tis_core gpio_ich snd soundcore tpm psmouse lpc_ich evdev asus_atk0110 serio_raw lp parport raid456 async_raid6_recov async_pq async_xor async_memcpy async_tx multipath usbhid hid sr_mod cdrom sg firewire_ohci firewire_core floppy crc_itu_t i915 atl1 fjes mii uhci_hcd usbcore usb_common
CPU: 0 PID: 22318 Comm: btrfs-balance Tainted: G W 4.8.5-ia32-20161028 #2
Hardware name: System manufacturer P5E-VM HDMI/P5E-VM HDMI, BIOS 0604 07/16/2008
00000286 00000286 d74a3ca4 df414827 d74a3ce8 dfa132ab d74a3cd4 df05677a
dfa075cc d74a3d04 0000572e dfa132ab 0000073e df2d7de5 0000073e f698dc00
e9173e70 fffffffb d74a3cf0 df0567db 00000009 00000000 d74a3ce8 dfa075cc
Call Trace:
[<df414827>] dump_stack+0x58/0x81
[<df05677a>] __warn+0xea/0x110
[<df2d7de5>] ? btrfs_commit_transaction+0x2f5/0xcc0
[<df0567db>] warn_slowpath_fmt+0x3b/0x40
[<df2d7de5>] btrfs_commit_transaction+0x2f5/0xcc0
[<df096800>] ? prepare_to_wait_event+0xd0/0xd0
[<df33334f>] prepare_to_relocate+0x12f/0x180
[<df339a41>] relocate_block_group+0x31/0x790
[<df0b1427>] ? vprintk_default+0x37/0x40
[<df796ca0>] ? mutex_lock+0x10/0x30
[<df2f8f45>] ? btrfs_wait_ordered_roots+0x1d5/0x1f0
[<df14eed6>] ? printk+0x17/0x19
[<df2a47b2>] ? btrfs_printk+0x102/0x110
[<df33a388>] btrfs_relocate_block_group+0x1e8/0x2e0
[<df308a9f>] btrfs_relocate_chunk.isra.29+0x3f/0xf0
[<df30221f>] ? free_extent_buffer+0x4f/0xa0
[<df30a555>] btrfs_balance+0xb05/0x1820
[<df0b0afa>] ? console_unlock+0x40a/0x630
[<df30b2c1>] balance_kthread+0x51/0x80
[<df30b270>] ? btrfs_balance+0x1820/0x1820
[<df0722db>] kthread+0x9b/0xb0
[<df799922>] ret_from_kernel_thread+0xe/0x24
[<df072240>] ? kthread_stop+0x100/0x100
---[ end trace f461faff989bf259 ]---
BTRFS: error (device dm-0) in cleanup_transaction:1854: errno=-5 IO failure
BTRFS info (device dm-0): delayed_refs has NO entry
--
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Microsoft is to operating systems ....
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