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From: Dave T <davestechshop@gmail.com>
To: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: kernel: BTRFS error (device dm-1): Missing references.
Date: Tue, 29 Mar 2022 19:08:06 -0400	[thread overview]
Message-ID: <CAGdWbB7onZzhe3EHM9+TvJARGr9Kcg6rKuxdy2-1Jk6V-wuDwQ@mail.gmail.com> (raw)

My systemd journal (log) is filled with the BTRFS error shown below.
I'm running a fully updated Arch Linux system on a ThinkPad with the
latest bios updates for that hardware.

BTRFS scrub reports no errors on the internal and external storage devices.

An online search did not return anything I found relevant, so I have
no idea what this message means or how serious it is.

Mar 29 17:46:15 archlinux kernel: ------------[ cut here ]------------
Mar 29 17:46:15 archlinux kernel: WARNING: CPU: 2 PID: 1424 at
fs/btrfs/extent-tree.c:232 btrfs_lookup_extent_info+0x3bf/0x3e0
[btrfs]
Mar 29 17:46:15 archlinux kernel: Modules linked in: rfcomm
rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace sunrpc
fscache netfs cmac algif_hash algif_skcipher af_alg bnep snd_soc_skl
snd_soc_hdac_hda snd_hda_ext_core snd_hda_codec_hdmi snd_soc_sst_ipc
snd_soc_sst_dsp snd_soc_acpi_intel_match snd_soc_acpi intel_rapl_msr
snd_ctl_led snd_soc_core snd_compress snd_hda_codec_realtek ac97_bus
iTCO_wdt tps6598x snd_pcm_dmaengine snd_hda_codec_generic
intel_pmc_bxt ee1004 mei_pxp mei_hdcp typec snd_hda_intel
iTCO_vendor_support intel_rapl_common snd_intel_dspcfg iwlmvm
snd_intel_sdw_acpi snd_hda_codec mac80211 intel_tcc_cooling uvcvideo
snd_hda_core x86_pkg_temp_thermal intel_powerclamp videobuf2_vmalloc
libarc4 think_lmi btusb coretemp videobuf2_memops snd_hwdep rapl
intel_cstate intel_uncore iwlwifi pcspkr psmouse btrtl snd_pcm
cdc_mbim i2c_i801 videobuf2_v4l2 btbcm firmware_attributes_class
wmi_bmof intel_wmi_thunderbolt e1000e i2c_smbus snd_timer
videobuf2_common cdc_wdm mei_me intel_lpss_pci
Mar 29 17:46:15 archlinux kernel:  btintel cdc_ncm cfg80211 intel_lpss
mei idma64 videodev bluetooth cdc_ether qcserial mc usbnet i915
ecdh_generic mii usb_wwan mousedev joydev crc16
intel_xhci_usb_role_switch ttm thinkpad_acpi roles intel_pch_thermal
intel_gtt ledtrig_audio i2c_multi_instantiate platform_profile rfkill
snd soundcore acpi_pad mac_hid ipmi_devintf ipmi_msghandler
crypto_user fuse bpf_preload ip_tables x_tables ecb crypto_simd xts
btrfs blake2b_generic libcrc32c crc32c_generic xor raid6_pq
hid_multitouch usbhid uas usb_storage dm_crypt cbc encrypted_keys
dm_mod trusted asn1_encoder tee tpm rng_core rtsx_pci_sdmmc serio_raw
mmc_core atkbd libps2 crct10dif_pclmul crc32_pclmul crc32c_intel
ghash_clmulni_intel cryptd rtsx_pci xhci_pci xhci_pci_renesas wmi
i8042 video serio vfat fat
Mar 29 17:46:15 archlinux kernel: CPU: 2 PID: 1424 Comm: btrfs-cleaner
Tainted: G     U  W         5.16.16-arch1-1 #1
ea44c25f01916b44dd68de6a90ee2f4c9e51dcb4
Mar 29 17:46:15 archlinux kernel: Hardware name: LENOVO
20HNCTO1WW/20HNCTO1WW, BIOS R0IET64W (1.42 ) 05/27/2021
Mar 29 17:46:15 archlinux kernel: RIP:
0010:btrfs_lookup_extent_info+0x3bf/0x3e0 [btrfs]
Mar 29 17:46:15 archlinux kernel: Code: 08 0d 00 00 c7 44 24 14 00 00
00 00 48 89 44 24 08 e9 d0 fc ff ff 80 48 6a 0c e9 e3 fc ff ff 48 85
db 0f 85 61 ff ff ff 0f 0b <0f> 0b eb 82 b8 f4 ff ff ff eb aa e8 01 ef
38 db e9 3f 1c 0c 00 66
Mar 29 17:46:15 archlinux kernel: RSP: 0018:ffffba48014cfc50 EFLAGS: 00010246
Mar 29 17:46:15 archlinux kernel: RAX: 0000000000000000 RBX:
0000000000000000 RCX: 0000000000000000
Mar 29 17:46:15 archlinux kernel: RDX: 0000000000000000 RSI:
000000531c714000 RDI: ffff93640021b178
Mar 29 17:46:15 archlinux kernel: RBP: ffff9365d8a11ee0 R08:
0000000000000000 R09: ffff9365d8a11ee0
Mar 29 17:46:15 archlinux kernel: R10: 000145ce761ca360 R11:
0000000000000000 R12: ffff93640021b000
Mar 29 17:46:15 archlinux kernel: R13: ffff93640021b178 R14:
0000000000000000 R15: 000000531c714000
Mar 29 17:46:15 archlinux kernel: FS:  0000000000000000(0000)
GS:ffff936b1f500000(0000) knlGS:0000000000000000
Mar 29 17:46:15 archlinux kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Mar 29 17:46:15 archlinux kernel: CR2: 00007f448004a000 CR3:
000000055c810001 CR4: 00000000003706e0
Mar 29 17:46:15 archlinux kernel: DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Mar 29 17:46:15 archlinux kernel: DR3: 0000000000000000 DR6:
00000000fffe0ff0 DR7: 0000000000000400
Mar 29 17:46:15 archlinux kernel: Call Trace:
Mar 29 17:46:15 archlinux kernel:  <TASK>
Mar 29 17:46:15 archlinux kernel:  do_walk_down+0x171/0x690 [btrfs
0911a8fe6c71eb7dbbad7c3b2067cc4913bade04]
Mar 29 17:46:15 archlinux kernel:  walk_down_tree+0xce/0x110 [btrfs
0911a8fe6c71eb7dbbad7c3b2067cc4913bade04]
Mar 29 17:46:15 archlinux kernel:  btrfs_drop_snapshot+0x1de/0x830
[btrfs 0911a8fe6c71eb7dbbad7c3b2067cc4913bade04]
Mar 29 17:46:15 archlinux kernel:
btrfs_clean_one_deleted_snapshot+0xe4/0x100 [btrfs
0911a8fe6c71eb7dbbad7c3b2067cc4913bade04]
Mar 29 17:46:15 archlinux kernel:  cleaner_kthread+0xe5/0x130 [btrfs
0911a8fe6c71eb7dbbad7c3b2067cc4913bade04]
Mar 29 17:46:15 archlinux kernel:  ? end_workqueue_bio+0xc0/0xc0
[btrfs 0911a8fe6c71eb7dbbad7c3b2067cc4913bade04]
Mar 29 17:46:15 archlinux kernel:  kthread+0x15c/0x180
Mar 29 17:46:15 archlinux kernel:  ? set_kthread_struct+0x40/0x40
Mar 29 17:46:15 archlinux kernel:  ret_from_fork+0x22/0x30
Mar 29 17:46:15 archlinux kernel:  </TASK>
Mar 29 17:46:15 archlinux kernel: ---[ end trace bc332cefd9295579 ]---
Mar 29 17:46:15 archlinux kernel: BTRFS error (device dm-1): Missing references.


# btrfs scrub status /mnt/usb_hdd
UUID:             <redacted>
Scrub started:    Tue Mar 29 01:45:08 2022
Status:           finished
Duration:         1:43:34
Total to scrub:   392.98GiB
Rate:             64.76MiB/s
Error summary:    no errors found


# btrfs scrub status /
UUID:             <redacted>
Scrub started:    Tue Mar 29 03:33:08 2022
Status:           finished
Duration:         0:02:42
Total to scrub:   59.40GiB
Rate:             318.16MiB/s
Error summary:    no errors found

Here is an indication of how frequently the errors are reported in the logs:

Mar 29 17:44:12 kernel: BTRFS error (device dm-1): Missing references.
Mar 29 17:44:43 kernel: BTRFS error (device dm-1): Missing references.
Mar 29 17:45:14 kernel: BTRFS error (device dm-1): Missing references.
Mar 29 17:45:44 kernel: BTRFS error (device dm-1): Missing references.

It looks like it is reported every 30 seconds continuously, whether
the device is being actively used or is idle.

             reply	other threads:[~2022-03-29 23:08 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-29 23:08 Dave T [this message]
2022-03-29 23:39 ` kernel: BTRFS error (device dm-1): Missing references Dave T
2022-03-30  0:58   ` Dave T
2022-03-30  2:32     ` Dave T

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