Bug 934464 – btrfs partition converted from ext4 becomes read-only minutes after booting: WARNING: CPU: 2 PID: 2777 at ../fs/btrfs/super.c:260 __btrfs_abort_transaction+0x4b/0x120 [btrfs]()

Bug 934464 - btrfs partition converted from ext4 becomes read-only minutes after booting: WARNING: CPU: 2 PID: 2777 at ../fs/btrfs/super.c:260 __btrfs_abort_transaction+0x4b/0x120 [btrfs]()


Summary:	btrfs partition converted from ext4 becomes read-only minutes after booting: ...

Status:	NEW

Classification:	openSUSE
Product:	openSUSE Tumbleweed
Classification:	openSUSE
Component:	Kernel
Version:	Current
Hardware:	x86-64 SUSE Other

Priority:	P5 - None Severity: Major (vote)
Target Milestone:	---
Assigned To:	David Sterba
QA Contact:	E-mail List

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Reported:	2015-06-11 20:54 UTC by Robert Munteanu
Modified:	2017-01-20 14:11 UTC (History)
CC List:	3 users (show)

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Flags:	lpechacek: needinfo? (rombert)

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Description Robert Munteanu 2015-06-11 20:54:32 UTC

I have TW install which used to have a ext4 / partition. Using a rescue TW USB stick ( created about 2-3 weeks ago ) I converted that partition to btrfs. I did a balance and defrag ( in that order ) , both when the fs was mounted.

After logging in to KDE I quickly get a read-only filesystem. I've pasted the backtrace below

Jun 11 23:13:08 mars kernel: WARNING: CPU: 2 PID: 2777 at ../fs/btrfs/super.c:260 __btrfs_abort_transaction+0x4b/0x120 [btrfs]()
Jun 11 23:13:08 mars kernel: BTRFS: Transaction aborted (error -95)
Jun 11 23:13:08 mars kernel: Modules linked in: bnep bluetooth rfkill fuse vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) af_packet nf_log_ipv6 xt_pkttype nf_log_ip
v4 nf_log_common xt_LOG xt_limit ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_con
ntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables xfs libcrc32c snd_hda
_codec_hdmi raid1 md_mod gpio_ich ppdev iTCO_wdt iTCO_vendor_support coretemp snd_hda_codec_realtek snd_hda_codec_generic kvm_intel snd_hda_intel dm_mod kvm snd_hda_co
ntroller snd_hda_codec snd_hwdep serio_raw pcspkr snd_pcm i2c_i801 snd_seq joydev snd_seq_device snd_timer snd 8250_fintek parport_pc parport acpi_cpufreq lpc_ich
Jun 11 23:13:08 mars kernel:  soundcore mfd_core shpchp processor ata_generic btrfs hid_logitech_hidpp xor raid6_pq sr_mod cdrom nvidia_uvm(PO) nvidia(PO) firewire_ohc
i firewire_core crc_itu_t uas usb_storage r8169 mii pata_jmicron hid_logitech_dj drm button sg
Jun 11 23:13:08 mars kernel: CPU: 2 PID: 2777 Comm: kworker/u8:0 Tainted: P           O    4.0.4-3-desktop #1
Jun 11 23:13:08 mars kernel: Hardware name: Gigabyte Technology Co., Ltd. EP35-DS4/EP35-DS4, BIOS F6d 01/08/2009
Jun 11 23:13:08 mars kernel: Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
Jun 11 23:13:08 mars kernel:  0000000000000000 ffffffffa0a92832 ffffffff8167c4aa ffff880128513ca8
Jun 11 23:13:08 mars kernel:  ffffffff81063bb1 ffff880031929d28 ffff880221e71800 00000000ffffffa1
Jun 11 23:13:08 mars kernel:  ffffffffa0a914e0 0000000000000b50 ffffffff81063c2a ffffffffa0a95928
Jun 11 23:13:08 mars kernel: Call Trace:
Jun 11 23:13:08 mars kernel:  [<ffffffff8100574c>] dump_trace+0x8c/0x340
Jun 11 23:13:08 mars kernel:  [<ffffffff81005aa3>] show_stack_log_lvl+0xa3/0x190
Jun 11 23:13:08 mars kernel:  [<ffffffff81007201>] show_stack+0x21/0x50
Jun 11 23:13:08 mars kernel:  [<ffffffff8167c4aa>] dump_stack+0x47/0x67
Jun 11 23:13:08 mars kernel:  [<ffffffff81063bb1>] warn_slowpath_common+0x81/0xb0
Jun 11 23:13:08 mars kernel:  [<ffffffff81063c2a>] warn_slowpath_fmt+0x4a/0x50
Jun 11 23:13:08 mars kernel:  [<ffffffffa09e598b>] __btrfs_abort_transaction+0x4b/0x120 [btrfs]
Jun 11 23:13:08 mars kernel:  [<ffffffffa0a1d18a>] btrfs_finish_ordered_io+0x5aa/0x620 [btrfs]
Jun 11 23:13:08 mars kernel:  [<ffffffffa0a43253>] normal_work_helper+0xc3/0x320 [btrfs]
Jun 11 23:13:08 mars kernel:  [<ffffffff8107bcf2>] process_one_work+0x142/0x420
Jun 11 23:13:08 mars kernel:  [<ffffffff8107c0e4>] worker_thread+0x114/0x460
Jun 11 23:13:08 mars kernel:  [<ffffffff81081261>] kthread+0xc1/0xe0
Jun 11 23:13:08 mars kernel:  [<ffffffff81682d58>] ret_from_fork+0x58/0x90
Jun 11 23:13:08 mars kernel: ---[ end trace 4c4eb7d6e98afa91 ]---
Jun 11 23:13:08 mars kernel: BTRFS: error (device sda1) in btrfs_finish_ordered_io:2896: errno=-95 unknown
Jun 11 23:13:08 mars kernel: BTRFS info (device sda1): forced readonly

I've only found one reference to this problem online, and it also seems to be related to partitions converted from ext4:
  
  http://comments.gmane.org/gmane.comp.file-systems.btrfs/45297

Comment 1 Robert Munteanu 2015-06-12 08:06:19 UTC

Some additional info:

- btrfs scrub reports no errors
- on the host machine I'm running btrfs v4.0+20150429 and kernel 4.0.4-3-desktop
- on the live medium, used to run btrfs-convert, I was running btrfs v4.0+20150429 and kernel 4.0.3-1-default

# btrfs fi show
Label: none  uuid: 54dea125-74cd-4bb2-86a2-f7bc645b76cf
        Total devices 1 FS bytes used 90.22GiB
        devid    1 size 223.57GiB used 92.03GiB path /dev/sda1

btrfs-progs v4.0+20150429

# btrfs fi df /
Data, single: total=89.00GiB, used=88.17GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=3.00GiB, used=2.05GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

Comment 2 Libor Pechacek 2017-01-20 14:02:13 UTC

Robert, does the issue still persist with current Tumbleweed?

Comment 3 Robert Munteanu 2017-01-20 14:11:47 UTC

(In reply to Libor Pechacek from comment #2)
> Robert, does the issue still persist with current Tumbleweed?

I reinstalled TW some time ago due to this error so I'm unable to provide more information.