I've tried to use btrfs on USB-stick, but unfortunately it fails with
write errors.
The below is for kernel 4.4; I've tried with 4.6.2, and it fails in a
similar way.
I'm not sure how to reliably reproduce it, but it seems to me it has
something to do with:
- plenty of random writes
- USB stick sometimes "very slow to reply" (may be USB-stick dependent)
The closest thing to reproduce pretty much within an hour was launching
ktorrent and downloading a couple of Linux isos.
ext4 does not fail under similar load. USB stick is brand new, writing
data with dd is successful, reading data with dd is successful (whether
it's ext4, btrfs or raw partition); it only seems to fail with btrfs and
plenty of random writes.
Jun 14 07:50:26 ativ kernel: [57362.029895]
btrfs_dev_stat_print_on_error: 3 callbacks suppressed
Jun 14 07:50:26 ativ kernel: [57362.029912] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 1, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.030912] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 2, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.031585] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.032260] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 4, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.033040] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 5, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.033400] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 6, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.033408] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 7, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.033491] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 8, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.033498] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 9, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.033566] BTRFS error (device sdb1):
bdev /dev/sdb1 errs: wr 10, rd 0, flush 0, corrupt 0, gen 0
Jun 14 07:50:26 ativ kernel: [57362.033587] BTRFS: error (device sdb1)
in btrfs_commit_transaction:2124: errno=-5 IO failure (Error while
writing out transaction)
Jun 14 07:50:26 ativ kernel: [57362.033591] BTRFS info (device sdb1):
forced readonly
Jun 14 07:50:26 ativ kernel: [57362.033597] BTRFS warning (device sdb1):
Skipping commit of aborted transaction.
Jun 14 07:50:26 ativ kernel: [57362.033601] ------------[ cut here
]------------
Jun 14 07:50:26 ativ kernel: [57362.033659] WARNING: CPU: 3 PID: 24844
at /build/linux-oXTOqc/linux-4.4.0/fs/btrfs/transaction.c:1746
cleanup_transaction+0x92/0x300 [btrfs]()
Jun 14 07:50:26 ativ kernel: [57362.033662] BTRFS: Transaction aborted
(error -5)
Jun 14 07:50:26 ativ kernel: [57362.033665] Modules linked in:
nls_iso8859_1 ctr ccm hid_generic usbhid hid rfcomm pci_stub vboxpci(OE)
vboxnetadp(OE) vboxnetflt(OE) msr vboxdrv(OE) drbg ansi_cprng
xt_CHECKSUM iptable_mangle bnep ipt_MASQUERADE nf_nat_masquerade_ipv4
iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp
llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter
ip_tables x_tables rtsx_usb_ms memstick ath3k btusb btrtl btbcm btintel
amd_freq_sensitivity uvcvideo crct10dif_pclmul videobuf2_vmalloc
videobuf2_memops crc32_pclmul bluetooth samsung_laptop videobuf2_v4l2
videobuf2_core v4l2_common arc4 videodev media ath9k aesni_intel
ath9k_common aes_x86_64 snd_hda_codec_realtek lrw snd_hda_codec_generic
gf128mul ath9k_hw glue_helper snd_hda_codec_hdmi ablk_helper
snd_hda_intel cryptd snd_hda_codec ath snd_hda_core snd_hwdep mac80211
joydev snd_pcm edac_mce_amd input_leds snd_seq_midi edac_core serio_raw
snd_seq_midi_event fam15h_power k10temp i2c_piix4 snd_rawmidi cfg80211
snd_seq snd_seq_device snd_timer shpchp snd soundcore mac_hid
binfmt_misc kvm_amd kvm irqbypass parport_pc ppdev sunrpc lp parport
autofs4 btrfs xor raid6_pq rtsx_usb_sdmmc uas usb_storage rtsx_usb
amdkfd amd_iommu_v2 radeon i2c_algo_bit ttm drm_kms_helper syscopyarea
psmouse sysfillrect sysimgblt fb_sys_fops ahci drm libahci r8169 mii wmi
fjes video
Jun 14 07:50:26 ativ kernel: [57362.033842] CPU: 3 PID: 24844 Comm:
ktorrent Tainted: G W OE 4.4.0-24-generic #43-Ubuntu
Jun 14 07:50:26 ativ kernel: [57362.033846] Hardware name: SAMSUNG
ELECTRONICS CO., LTD. 905S3G/906S3G/915S3G/NP905S3G-K01PL, BIOS
P06RBV.074.130822.FL 08/22/2013
Jun 14 07:50:26 ativ kernel: [57362.033851] 0000000000000286
000000004d3ecc09 ffff8800043a3bf0 ffffffff813eab23
Jun 14 07:50:26 ativ kernel: [57362.033858] ffff8800043a3c38
ffffffffc03fa060 ffff8800043a3c28 ffffffff810810d2
Jun 14 07:50:26 ativ kernel: [57362.033864] ffff8801211a5cb0
ffff880137001800 ffff8800442a93c0 00000000fffffffb
Jun 14 07:50:26 ativ kernel: [57362.033870] Call Trace:
Jun 14 07:50:26 ativ kernel: [57362.033884] [<ffffffff813eab23>]
dump_stack+0x63/0x90
Jun 14 07:50:26 ativ kernel: [57362.033893] [<ffffffff810810d2>]
warn_slowpath_common+0x82/0xc0
Jun 14 07:50:26 ativ kernel: [57362.033899] [<ffffffff8108116c>]
warn_slowpath_fmt+0x5c/0x80
Jun 14 07:50:26 ativ kernel: [57362.033937] [<ffffffffc0374092>]
cleanup_transaction+0x92/0x300 [btrfs]
Jun 14 07:50:26 ativ kernel: [57362.033945] [<ffffffff810c3b80>] ?
wake_atomic_t_function+0x60/0x60
Jun 14 07:50:26 ativ kernel: [57362.033983] [<ffffffffc0374e64>]
btrfs_commit_transaction+0x2e4/0xa90 [btrfs]
Jun 14 07:50:26 ativ kernel: [57362.034020] [<ffffffffc036e9af>]
btrfs_commit_super+0x8f/0xa0 [btrfs]
Jun 14 07:50:26 ativ kernel: [57362.034056] [<ffffffffc03704ee>]
close_ctree+0x2ae/0x360 [btrfs]
Jun 14 07:50:26 ativ kernel: [57362.034088] [<ffffffffc033fee9>]
btrfs_put_super+0x19/0x20 [btrfs]
Jun 14 07:50:26 ativ kernel: [57362.034097] [<ffffffff8120ee7f>]
generic_shutdown_super+0x6f/0x100
Jun 14 07:50:26 ativ kernel: [57362.034102] [<ffffffff8120f192>]
kill_anon_super+0x12/0x20
Jun 14 07:50:26 ativ kernel: [57362.034133] [<ffffffffc03410b8>]
btrfs_kill_super+0x18/0x120 [btrfs]
Jun 14 07:50:26 ativ kernel: [57362.034140] [<ffffffff8120f363>]
deactivate_locked_super+0x43/0x70
Jun 14 07:50:26 ativ kernel: [57362.034145] [<ffffffff8120f83c>]
deactivate_super+0x5c/0x60
Jun 14 07:50:26 ativ kernel: [57362.034151] [<ffffffff8122d0ef>]
cleanup_mnt+0x3f/0x90
Jun 14 07:50:26 ativ kernel: [57362.034156] [<ffffffff8122d182>]
__cleanup_mnt+0x12/0x20
Jun 14 07:50:26 ativ kernel: [57362.034163] [<ffffffff8109eac3>]
task_work_run+0x73/0x90
Jun 14 07:50:26 ativ kernel: [57362.034170] [<ffffffff81003242>]
exit_to_usermode_loop+0xc2/0xd0
Jun 14 07:50:26 ativ kernel: [57362.034176] [<ffffffff81003c6e>]
syscall_return_slowpath+0x4e/0x60
Jun 14 07:50:26 ativ kernel: [57362.034185] [<ffffffff81825d50>]
int_ret_from_sys_call+0x25/0x8f
Jun 14 07:50:26 ativ kernel: [57362.034189] ---[ end trace
43a0a9df7507537d ]---
Jun 14 07:50:26 ativ kernel: [57362.034194] BTRFS: error (device sdb1)
in cleanup_transaction:1746: errno=-5 IO failure
Jun 14 07:50:26 ativ kernel: [57362.034200] BTRFS info (device sdb1):
delayed_refs has NO entry
Jun 14 07:50:26 ativ kernel: [57362.034220] BTRFS error (device sdb1):
commit super ret -5
Jun 14 07:50:26 ativ kernel: [57362.034339] BTRFS error (device sdb1):
cleaner transaction attach returned -30
Tomasz Chmielewski
http://wpkg.org
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