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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1595134

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1595134

Title:
  btrfs error: read only filesystem

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have some problems with btrfs filesystem. This time an error
  occurred just after the start up and the filesystem has been mounted
  as read only.

  Kernel log:
  [   35.214387] ------------[ cut here ]------------
  [   35.214406] WARNING: CPU: 5 PID: 3124 at /build/linux-oXTOqc/linux-4.4.0/fs/btrfs/inode.c:4485 btrfs_truncate_inode_items+0xc1d/0xd20 [btrfs]()
  [   35.214407] BTRFS: Transaction aborted (error -11)
  [   35.214408] Modules linked in: xt_addrtype br_netfilter xt_CHECKSUM iptable_mangle 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 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) binfmt_misc intel_rapl x86_pkg_temp_thermal input_leds intel_powerclamp coretemp crct10dif_pclmul snd_hda_codec_realtek crc32_pclmul snd_hda_codec_generic snd_hda_codec_hdmi snd_soc_rt5640 snd_soc_ssm4567 snd_soc_rl6231 snd_hda_intel aesni_intel snd_soc_core aes_x86_64 snd_hda_codec lrw gf128mul glue_helper snd_hda_core snd_compress ablk_helper ac97_bus cryptd snd_hwdep snd_pcm_dmaengine serio_raw
  [   35.214436]  mei_me snd_seq_midi snd_seq_midi_event lpc_ich mei snd_pcm snd_rawmidi snd_seq shpchp snd_seq_device snd_timer snd 8250_fintek elan_i2c soundcore i2c_designware_platform 8250_dw dw_dmac dw_dmac_core i2c_designware_core spi_pxa2xx_platform snd_soc_sst_acpi mac_hid acpi_pad kvm_intel kvm irqbypass parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq hid_generic usbhid amdkfd amd_iommu_v2 radeon i915 ttm i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops psmouse ahci drm r8169 libahci mii i2c_hid sdhci_acpi sdhci video hid fjes
  [   35.214462] CPU: 5 PID: 3124 Comm: SimpleCacheWork Tainted: G           OE   4.4.0-24-generic #43-Ubuntu
  [   35.214463] Hardware name: Gigabyte Technology Co., Ltd. Z97-HD3/Z97-HD3, BIOS F6 06/11/2014
  [   35.214465]  0000000000000286 00000000dd8b3f1e ffff8803e71f3c18 ffffffff813eab23
  [   35.214466]  ffff8803e71f3c60 ffffffffc05c4220 ffff8803e71f3c50 ffffffff810810d2
  [   35.214468]  ffff880414f91000 ffff8800b8745b58 0000000000000000 ffff8800b85126c0
  [   35.214470] Call Trace:
  [   35.214475]  [<ffffffff813eab23>] dump_stack+0x63/0x90
  [   35.214478]  [<ffffffff810810d2>] warn_slowpath_common+0x82/0xc0
  [   35.214480]  [<ffffffff8108116c>] warn_slowpath_fmt+0x5c/0x80
  [   35.214492]  [<ffffffffc05a3a4f>] ? ulist_free+0x1f/0x30 [btrfs]
  [   35.214504]  [<ffffffffc054a4fd>] btrfs_truncate_inode_items+0xc1d/0xd20 [btrfs]
  [   35.214507]  [<ffffffff810c3b80>] ? wake_atomic_t_function+0x60/0x60
  [   35.214518]  [<ffffffffc054a6e2>] btrfs_truncate+0xe2/0x2c0 [btrfs]
  [   35.214529]  [<ffffffffc054af85>] btrfs_setattr+0x1e5/0x360 [btrfs]
  [   35.214531]  [<ffffffff81229d35>] notify_change+0x235/0x360
  [   35.214533]  [<ffffffff81209a75>] do_truncate+0x75/0xc0
  [   35.214535]  [<ffffffff8120aa29>] do_sys_ftruncate.constprop.13+0x119/0x170
  [   35.214537]  [<ffffffff8120ac2e>] SyS_ftruncate+0xe/0x10
  [   35.214540]  [<ffffffff81825bf2>] entry_SYSCALL_64_fastpath+0x16/0x71
  [   35.214542] ---[ end trace 619f33d132d16603 ]---
  [   35.214544] BTRFS warning (device sdb3): btrfs_truncate_inode_items:4485: Aborting unused transaction(unknown).
  [   35.222150] BTRFS: error (device sdb3) in btrfs_truncate_inode_items:4485: errno=-11 unknown
  [   35.222153] BTRFS info (device sdb3): forced readonly
  [  374.383753] audit: type=1400 audit(1466590347.068:31): apparmor="DENIED" operation="capable" profile="/usr/sbin/cupsd" pid=884 comm="cupsd" capability=12  capname="net_admin"
  [  374.383768] audit: type=1400 audit(1466590347.068:32): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/cupsd" name="/run/systemd/journal/socket" pid=884 comm="cupsd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
  [  374.383778] audit: type=1400 audit(1466590347.068:33): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/cupsd" name="/run/systemd/journal/socket" pid=884 comm="cupsd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
  [  374.383825] audit: type=1400 audit(1466590347.068:34): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/cupsd" name="/run/systemd/journal/socket" pid=884 comm="cupsd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
  [  374.383833] audit: type=1400 audit(1466590347.068:35): apparmor="DENIED" operation="sendmsg" profile="/usr/sbin/cupsd" name="/run/systemd/journal/socket" pid=884 comm="cupsd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0

  The filesystem is mounted as:
  UUID=7b378779-2fea-4f8a-a365-ff9529ed110a /               btrfs   defaults,noatime,compress=lzo,subvol=@ 0       1
  UUID=7b378779-2fea-4f8a-a365-ff9529ed110a /home           btrfs   defaults,noatime,compress=lzo,subvol=@home 0       2

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