Re: How to repair "btrfs_chunk_readonly: BUG_ON `!ce` triggered, value 1"?,Re: How to repair "btrfs_chunk_readonly: BUG_ON `!ce` triggered, value 1"?

[HIRAKI Hideaki <hhiraki@nig.ac.jp>]

[-- Attachment #1: Type: Text/Plain, Size: 8022 bytes --]

Dear Qu,

At Tue, 15 Jan 2019 20:55:38 +0800, Qu Wenruo wrote:
> On 2019/1/15 下午7:47, HIRAKI Hideaki wrote:
>> Hello,
>> 
>> I have two questions and a bug report.
>> 
>> Once upon a time I converted an ext3 partition to BTRFS to mount on
>> /var/lib/docker and was happy with it. Recently an error occured:
>> 
>>  kernel: BTRFS info (device sdc1): leaf 2013170442240 total ptrs 171 free space 6365
>>  kernel: BTRFS error (device sdc1): eb 2013170442240 invalid extent inline ref type 182
>>  kernel: BTRFS: Transaction aborted (error -22)
>>  kernel: BTRFS: error (device sdc1) in btrfs_run_delayed_refs:3089: errno=-22 unknown
>>  kernel: BTRFS info (device sdc1): forced readonly
>>  kernel: BTRFS error (device sdc1): pending csums is 77824
>> 
>> Now I know this was caused by the kernel upgrade from 4.12.5 to 4.14.83 which
>> introduced an additional check of alignments rather than by a recent trivial
>> file system corruption.
> 
> Nope, the alignment check is mostly done by tree-checker, but it's not
> the case.
> 
> It's a really valid extent type checker, introduced by commit
> 167ce953ca55 ("Btrfs: add a helper to retrive extent inline ref type"),
> which get merged into v4.14.
> 
> I'm not pretty sure why but this looks like either some corruption in
> extent tree code, or just too old btrfs-convert.
>

I'm sorry too much was ommitted in the message. Grepping "kernel: BTRFS" was
not enough. Full log is attached.

>> But I was hasty and commited such follies as hard
>> resets on busy kernel, btrfs rescue chunk-recover -y,
> 
> Chunk-recovery is normally useless.
> 
>> btrfs check --repair,
> 
> And this could cause more problem unless you're really knowing the
> problem can be fixed or your data isn't that important.
> 
>> etc. As you may expect, the partition is not mountable any more:
>> 
>> # mount -o compress=lzo,noatime /dev/sdc1 /mnt/temp
>> mount: /mnt/temp: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error.
>> 
>>  kernel: BTRFS info (device sdc1): use lzo compression
>>  kernel: BTRFS info (device sdc1): disk space caching is enabled
>>  kernel: BTRFS info (device sdc1): has skinny extents
>>  kernel: BTRFS info (device sdc1): bdev /dev/sdc1 errs: wr 1396, rd 0, flush 0, corrupt 0, gen 0
>>  kernel: BTRFS error (device sdc1): logical 3955568533504 len 1073741824 found bg but no related chunk
> 
> Some bad recovery move caused more problem, one block group doesn't has
> corresponding chunk.
> I don't know exactly what the cause is.
> 
>>  kernel: BTRFS error (device sdc1): failed to read block groups: -2
>>  kernel: BTRFS error (device sdc1): open_ctree failed
>> 
>> Even btrfs check aborts:
>> 
>> # btrfs check --repair /dev/sdc1
>> enabling repair mode
>> Opening filesystem to check...
>> volumes.c:1729: btrfs_chunk_readonly: BUG_ON `!ce` triggered, value 1
>> btrfs(+0x2e246)[0x562a5547c246]
>> btrfs(+0x30cac)[0x562a5547ecac]
> 
> This could be worked around.
> 
> diff --git a/volumes.c b/volumes.c
> index 30090ce5f8e8..05deeed710fb 100644
> --- a/volumes.c
> +++ b/volumes.c
> @@ -1725,9 +1725,7 @@ int btrfs_chunk_readonly(struct btrfs_fs_info
> *fs_info, u64 chunk_offset)
>          * corresponding chunk, we will rebuild it later
>          */
>         ce = search_cache_extent(&map_tree->cache_tree, chunk_offset);
> -       if (!fs_info->is_chunk_recover)
> -               BUG_ON(!ce);
> -       else
> +       if (!ce)
>                 return 0;
> 
>         map = container_of(ce, struct map_lookup, ce);
> 
> 
> 
>> btrfs(btrfs_read_block_groups+0x27d)[0x562a55471f8d]
>> btrfs(btrfs_setup_all_roots+0x35f)[0x562a5546bc9f]
>> btrfs(+0x1e0cb)[0x562a5546c0cb]
>> btrfs(open_ctree_fs_info+0x8c)[0x562a5546c2cc]
>> btrfs(cmd_check+0x4db)[0x562a554b670b]
>> btrfs(main+0x7a)[0x562a55461e2a]
>> /lib64/libc.so.6(__libc_start_main+0xee)[0x7f83e3598bde]
>> btrfs(_start+0x2a)[0x562a55461f3a]
>> Aborted
>> 
>> How to repair this file system?
> 
> Use above diff to allow btrfs check to continue.
> But no --repair, and paste the output.
>

Thank you for the suggestion. That hit another BUG_ON.

# ./btrfs check /dev/sdc1
Opening filesystem to check...
volumes.c:1382: btrfs_rmap_block: BUG_ON `!ce` triggered, value 1
./btrfs(+0x3d001)[0x55c9b23ea001]
./btrfs(+0x3d09f)[0x55c9b23ea09f]
./btrfs(btrfs_rmap_block+0x89)[0x55c9b23ee13d]
./btrfs(exclude_super_stripes+0xd4)[0x55c9b23d9ec3]
./btrfs(btrfs_read_block_groups+0x2b3)[0x55c9b23d7bf0]
./btrfs(btrfs_setup_all_roots+0x402)[0x55c9b23cc49d]
./btrfs(+0x1fe6f)[0x55c9b23cce6f]
./btrfs(open_ctree_fs_info+0x177)[0x55c9b23cd06b]
./btrfs(cmd_check+0x725)[0x55c9b2447784]
./btrfs(main+0x127)[0x55c9b23c08e9]
/lib64/libc.so.6(__libc_start_main+0xee)[0x7f0552d46bde]
./btrfs(_start+0x2a)[0x55c9b23c016a]
Aborted


> Unfortunately, I don't believe the chance of a proper recovery is high.
> 
>> 
>> 
>> The second question is about btrfs-restore. It doesn't restore subvolumes
>> even when the destination path is in a BTRFS file system.
> 
> I had a plan to support snapshot/subvolume creation for btrfs-restore if
> destination is btrfs, or supports reflink.
> 
> But that feature will be too late for your use case anyway.
> 
>> "btrfs restore -l"
>> is to list subvolumes but the output lacks the path (relative to the top
>> level subvolume) information.
> 
> You could try my experimental patch:
> https://patchwork.kernel.org/patch/10738583/
> 
> It provides kernel equivalent of btrfs-restore, using 'ro,skip_bg' mount
> option.
> 
> If everything goes OK, then you should be able to get 'btrfs subv list'
> working.
>

I'll try this later.

Thanks again,

Hideaki


> Thanks,
> Qu
> 
>> With the information, the destination of
>> btrfs-restore with the subvolumes could be prepared and hopefully
>> "dockerd" would work properly with the restored file tree, though the files
>> would be duplicated significantly.
> 
> 
>> 
>> How can the subvolumes' paths be obtained from an unmountable file system?
>> 
>> 
>> By the way, some constants in the source code had to be increased to run
>> btrfs-restore for me.
>> 
>> --- cmds-restore.c~   2018-11-03 19:06:34.000000000 +0900
>> +++ cmds-restore.c    2019-01-09 00:34:17.000000000 +0900
>> @@ -289,7 +289,7 @@ static int copy_one_inline(struct btrfs_
>>  {
>>         struct extent_buffer *leaf = path->nodes[0];
>>         struct btrfs_file_extent_item *fi;
>> -       char buf[4096];
>> +       char buf[65536];
>>         char *outbuf;
>>         u64 ram_size;
>>         ssize_t done;
>> @@ -729,7 +729,7 @@ static int copy_file(struct btrfs_root *
>>         }
>>  
>>         while (1) {
>> -               if (loops >= 0 && loops++ >= 1024) {
>> +               if (loops >= 0 && loops++ >= 102400) {
>>                         enum loop_response resp;
>>  
>>                         resp = ask_to_continue(file);
>> @@ -1007,7 +1007,7 @@ static int search_dir(struct btrfs_root
>>         }
>>  
>>         while (leaf) {
>> -               if (loops++ >= 1024) {
>> +               if (loops++ >= 102400) {
>>                         printf("We have looped trying to restore files in %s "
>>                                "too many times to be making progress, "
>>                                "stopping\n", in_dir);
>> 
>> The first one is to avoid the abortion with "*** stack smashing detected ***".
>> So, not only the increase but also a size checking code (at least) is
>> necessary to fix this bug. I hope the other two constants (if necessary) will
>> be tunable from the command line option.
>> 
>> 
>> For your information:
>> 
>> # uname -a
>> Linux plcd1 4.14.83-gentoo #1 SMP Wed Dec 19 00:20:46 JST 2018 x86_64 Intel(R) Core(TM) i7-3970X CPU @ 3.50GHz GenuineIntel GNU/Linux
>> 
>> # btrfs --version
>> btrfs-progs v4.19 
>> 
>> # btrfs fi show
>> Label: none  uuid: 5e3d788d-5b81-4e3e-8776-5a131d008cbc
>>         Total devices 1 FS bytes used 1.41TiB
>>         devid    1 size 1.82TiB used 1.43TiB path /dev/sdc1
>> 
>> 
>> Regards,
>> 
>> Hideaki
>> 

[-- Attachment #2: btrfs.log --]
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kernel: BTRFS info (device sdc1): leaf 2013170442240 total ptrs 171 free space 6365
kernel: \x09item 0 key (2013167067136 169 0) itemoff 16250 itemsize 33
kernel: \x09\x09extent refs 1 gen 43688 flags 258
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kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 156 key (2013170130944 169 0) itemoff 11102 itemsize 33
kernel: \x09\x09extent refs 1 gen 58021 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 157 key (2013170147328 169 0) itemoff 11069 itemsize 33
kernel: \x09\x09extent refs 1 gen 43688 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2015221325824
kernel: \x09\x09\x09(parent 2015221325824 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 158 key (2013170163712 169 0) itemoff 11036 itemsize 33
kernel: \x09\x09extent refs 1 gen 43688 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2018191876096
kernel: \x09\x09\x09(parent 2018191876096 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 159 key (2013170180096 169 0) itemoff 11003 itemsize 33
kernel: \x09\x09extent refs 1 gen 43688 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2015159410688
kernel: \x09\x09\x09(parent 2015159410688 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 160 key (2013170196480 169 0) itemoff 10970 itemsize 33
kernel: \x09\x09extent refs 1 gen 58021 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 161 key (2013170212864 169 0) itemoff 10937 itemsize 33
kernel: \x09\x09extent refs 1 gen 43688 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2015173484544
kernel: \x09\x09\x09(parent 2015173484544 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 162 key (2013170229248 169 0) itemoff 10904 itemsize 33
kernel: \x09\x09extent refs 1 gen 43688 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2015212544000
kernel: \x09\x09\x09(parent 2015212544000 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 163 key (2013170245632 169 0) itemoff 10871 itemsize 33
kernel: \x09\x09extent refs 1 gen 58021 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 164 key (2013170262016 169 0) itemoff 10838 itemsize 33
kernel: \x09\x09extent refs 1 gen 58021 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 165 key (2013170278400 169 0) itemoff 10805 itemsize 33
kernel: \x09\x09extent refs 1 gen 58021 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 166 key (2013170294784 169 0) itemoff 10772 itemsize 33
kernel: \x09\x09extent refs 1 gen 58021 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 167 key (2013170311168 169 0) itemoff 10739 itemsize 33
kernel: \x09\x09extent refs 1 gen 58021 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022502195200
kernel: \x09\x09\x09(parent 2022502195200 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 168 key (2013170327552 169 0) itemoff 10706 itemsize 33
kernel: \x09\x09extent refs 1 gen 65015 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2018379210752
kernel: \x09\x09\x09(parent 2018379210752 is NOT ALIGNED to nodesize 16384)
kernel: \x09item 169 key (2013170343936 169 0) itemoff 10673 itemsize 33
kernel: \x09\x09extent refs 1 gen 65164 flags 2
kernel: \x09\x09ref#0: tree block backref root 2
kernel: \x09item 170 key (2013170360320 169 0) itemoff 10640 itemsize 33
kernel: \x09\x09extent refs 1 gen 43688 flags 258
kernel: \x09\x09ref#0: shared block backref parent 2022671196160
kernel: \x09\x09\x09(parent 2022671196160 is NOT ALIGNED to nodesize 16384)
kernel: BTRFS error (device sdc1): eb 2013170442240 invalid extent inline ref type 182
kernel: ------------[ cut here ]------------
kernel: WARNING: CPU: 0 PID: 1444 at fs/btrfs/extent-tree.c:1204 btrfs_get_extent_inline_ref_type+0x76/0xf0 [btrfs]
kernel: Modules linked in: xt_nat veth uinput nfsv3 rpcsec_gss_krb5 nfsv4 ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc ipt_REJECT nf_reject_ipv4 xt_multiport iptable_filter ip_tables rfcomm bnep autofs4 nfsd auth_rpcgss nfs_acl ipv6 crc_ccitt nvidia_drm(POE) nvidia_modeset(POE) nvidia(POE) x86_pkg_temp_thermal coretemp kvm_intel kvm drm_kms_helper btusb snd_hda_codec_hdmi drm syscopyarea sysfillrect btrtl btbcm btintel bluetooth sysimgblt fb_sys_fops ecdh_generic rfkill snd_hda_codec_realtek snd_hda_codec_generic e1000e irqbypass snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep iTCO_wdt snd_pcm snd_timer snd soundcore iTCO_vendor_support crc32c_intel
kernel:  wmi_bmof ghash_clmulni_intel mxm_wmi wmi cryptd pcspkr lpc_ich mfd_core ata_generic pata_acpi pcc_cpufreq xts cbc sha256_generic ixgb ixgbe tulip cxgb3 cxgb mdio cxgb4 vxge bonding vxlan ip6_udp_tunnel udp_tunnel macvlan vmxnet3 tg3 sky2 r8169 pcnet32 mii igb ptp pps_core dca i2c_algo_bit i2c_core e1000 bnx2 atl1c msdos fat configfs cramfs squashfs fuse xfs nfs lockd grace sunrpc fscache jfs reiserfs btrfs zstd_decompress zstd_compress xxhash ext4 jbd2 ext2 mbcache linear raid10 raid1 raid0 dm_zero dm_verity reed_solomon dm_thin_pool dm_switch dm_snapshot dm_raid raid456 async_raid6_recov async_memcpy async_pq raid6_pq dm_mirror dm_region_hash dm_log_writes dm_log_userspace dm_log dm_integrity async_xor async_tx xor dm_flakey dm_era dm_delay dm_crypt dm_cache_smq dm_cache dm_persistent_data
kernel:  libcrc32c dm_bufio dm_bio_prison dm_mod dax firewire_core crc_itu_t sl811_hcd xhci_pci xhci_hcd usb_storage mpt3sas raid_class aic94xx libsas lpfc qla2xxx megaraid_sas megaraid_mbox megaraid_mm aacraid sx8 hpsa 3w_9xxx 3w_xxxx 3w_sas mptsas scsi_transport_sas mptfc scsi_transport_fc mptspi mptscsih mptbase imm parport sym53c8xx initio arcmsr aic7xxx aic79xx scsi_transport_spi sr_mod cdrom sg sd_mod pdc_adma sata_inic162x sata_mv ata_piix ahci libahci sata_qstor sata_vsc sata_uli sata_sis sata_sx4 sata_nv sata_via sata_svw sata_sil24 sata_sil sata_promise pata_via pata_jmicron pata_marvell pata_sis pata_netcell pata_pdc202xx_old pata_atiixp pata_amd pata_ali pata_it8213 pata_pcmcia pata_serverworks pata_oldpiix pata_artop pata_it821x pata_hpt3x2n pata_hpt3x3 pata_hpt37x pata_hpt366 pata_cmd64x
kernel:  pata_sil680 pata_pdc2027x nvme nvme_core virtio_net virtio_crypto crypto_engine virtio_mmio virtio_pci virtio_balloon virtio_rng virtio_console virtio_blk virtio_scsi virtio_ring virtio
kernel: CPU: 0 PID: 1444 Comm: kworker/u24:3 Tainted: P           OE   4.14.83-gentoo #1
kernel: Hardware name: System manufacturer System Product Name/P9X79 PRO, BIOS 3305 12/25/2012
kernel: Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs]
kernel: task: ffff97cd612ccbc0 task.stack: ffffa2d5c2908000
kernel: RIP: 0010:btrfs_get_extent_inline_ref_type+0x76/0xf0 [btrfs]
kernel: RSP: 0018:ffffa2d5c290baf8 EFLAGS: 00010282
kernel: RAX: 000000000000004e RBX: 00000000000000b6 RCX: 0000000000000006
kernel: RDX: 0000000000000007 RSI: 0000000000000046 RDI: ffff97cdaf215550
kernel: RBP: ffff97cda2c6fc08 R08: 0000000000000001 R09: 0000000000000669
kernel: R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000001
kernel: R13: 0000000000003d84 R14: 0000000000003d84 R15: 0000000000003d8d
kernel: FS:  0000000000000000(0000) GS:ffff97cdaf200000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 000000c42072a000 CR3: 00000001b020a002 CR4: 00000000000606f0
kernel: Call Trace:
kernel:  lookup_inline_extent_backref+0x31a/0x5e0 [btrfs]
kernel:  ? set_extent_bit+0x19/0x20 [btrfs]
kernel:  insert_inline_extent_backref+0x44/0xc0 [btrfs]
kernel:  __btrfs_inc_extent_ref.isra.22+0x6b/0x230 [btrfs]
kernel:  __btrfs_run_delayed_refs+0x6dd/0x1230 [btrfs]
kernel:  ? __switch_to_asm+0x40/0x70
kernel:  btrfs_run_delayed_refs+0x7e/0x260 [btrfs]
kernel:  delayed_ref_async_start+0x8d/0xa0 [btrfs]
kernel:  btrfs_scrubparity_helper+0x72/0x2d0 [btrfs]
kernel:  process_one_work+0x1ca/0x3c0
kernel:  worker_thread+0x47/0x3f0
kernel:  kthread+0xfc/0x130
kernel:  ? process_one_work+0x3c0/0x3c0
kernel:  ? kthread_create_on_node+0x40/0x40
kernel:  ret_from_fork+0x3a/0x50
kernel: Code: 00 00 00 74 33 81 fb b2 00 00 00 74 2b 48 89 ef e8 d0 e1 00 00 48 8b 7d 18 48 8b 55 00 89 d9 48 c7 c6 a8 27 d2 c0 e8 ca de fe ff <0f> 0b 31 db 89 d8 5b 5d 41 5c 41 5d c3 41 83 fc 01 74 35 41 83 
kernel: ---[ end trace fc99e0a359d12e2e ]---
kernel: BTRFS: Transaction aborted (error -22)
kernel: ------------[ cut here ]------------
kernel: WARNING: CPU: 0 PID: 1444 at fs/btrfs/extent-tree.c:3089 btrfs_run_delayed_refs+0x24c/0x260 [btrfs]
kernel: Modules linked in: xt_nat veth uinput nfsv3 rpcsec_gss_krb5 nfsv4 ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype xt_conntrack nf_nat nf_conntrack br_netfilter bridge stp llc ipt_REJECT nf_reject_ipv4 xt_multiport iptable_filter ip_tables rfcomm bnep autofs4 nfsd auth_rpcgss nfs_acl ipv6 crc_ccitt nvidia_drm(POE) nvidia_modeset(POE) nvidia(POE) x86_pkg_temp_thermal coretemp kvm_intel kvm drm_kms_helper btusb snd_hda_codec_hdmi drm syscopyarea sysfillrect btrtl btbcm btintel bluetooth sysimgblt fb_sys_fops ecdh_generic rfkill snd_hda_codec_realtek snd_hda_codec_generic e1000e irqbypass snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep iTCO_wdt snd_pcm snd_timer snd soundcore iTCO_vendor_support crc32c_intel
kernel:  wmi_bmof ghash_clmulni_intel mxm_wmi wmi cryptd pcspkr lpc_ich mfd_core ata_generic pata_acpi pcc_cpufreq xts cbc sha256_generic ixgb ixgbe tulip cxgb3 cxgb mdio cxgb4 vxge bonding vxlan ip6_udp_tunnel udp_tunnel macvlan vmxnet3 tg3 sky2 r8169 pcnet32 mii igb ptp pps_core dca i2c_algo_bit i2c_core e1000 bnx2 atl1c msdos fat configfs cramfs squashfs fuse xfs nfs lockd grace sunrpc fscache jfs reiserfs btrfs zstd_decompress zstd_compress xxhash ext4 jbd2 ext2 mbcache linear raid10 raid1 raid0 dm_zero dm_verity reed_solomon dm_thin_pool dm_switch dm_snapshot dm_raid raid456 async_raid6_recov async_memcpy async_pq raid6_pq dm_mirror dm_region_hash dm_log_writes dm_log_userspace dm_log dm_integrity async_xor async_tx xor dm_flakey dm_era dm_delay dm_crypt dm_cache_smq dm_cache dm_persistent_data
kernel:  libcrc32c dm_bufio dm_bio_prison dm_mod dax firewire_core crc_itu_t sl811_hcd xhci_pci xhci_hcd usb_storage mpt3sas raid_class aic94xx libsas lpfc qla2xxx megaraid_sas megaraid_mbox megaraid_mm aacraid sx8 hpsa 3w_9xxx 3w_xxxx 3w_sas mptsas scsi_transport_sas mptfc scsi_transport_fc mptspi mptscsih mptbase imm parport sym53c8xx initio arcmsr aic7xxx aic79xx scsi_transport_spi sr_mod cdrom sg sd_mod pdc_adma sata_inic162x sata_mv ata_piix ahci libahci sata_qstor sata_vsc sata_uli sata_sis sata_sx4 sata_nv sata_via sata_svw sata_sil24 sata_sil sata_promise pata_via pata_jmicron pata_marvell pata_sis pata_netcell pata_pdc202xx_old pata_atiixp pata_amd pata_ali pata_it8213 pata_pcmcia pata_serverworks pata_oldpiix pata_artop pata_it821x pata_hpt3x2n pata_hpt3x3 pata_hpt37x pata_hpt366 pata_cmd64x
kernel:  pata_sil680 pata_pdc2027x nvme nvme_core virtio_net virtio_crypto crypto_engine virtio_mmio virtio_pci virtio_balloon virtio_rng virtio_console virtio_blk virtio_scsi virtio_ring virtio
kernel: CPU: 0 PID: 1444 Comm: kworker/u24:3 Tainted: P        W  OE   4.14.83-gentoo #1
kernel: Hardware name: System manufacturer System Product Name/P9X79 PRO, BIOS 3305 12/25/2012
kernel: Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs]
kernel: task: ffff97cd612ccbc0 task.stack: ffffa2d5c2908000
kernel: RIP: 0010:btrfs_run_delayed_refs+0x24c/0x260 [btrfs]
kernel: RSP: 0018:ffffa2d5c290bdb8 EFLAGS: 00010296
kernel: RAX: 0000000000000026 RBX: ffff97cbf45b0e88 RCX: ffffffffac24dca8
kernel: RDX: 0000000000000001 RSI: 0000000000000046 RDI: ffffffffac8243ac
kernel: RBP: ffff97cda07b0000 R08: 0000000000000001 R09: 0000000000000690
kernel: R10: 0000000000000002 R11: 0000000000000000 R12: 00000000000003fe
kernel: R13: ffff97cd76dea800 R14: 00000000000003fe R15: ffff97ccf9fc33c0
kernel: FS:  0000000000000000(0000) GS:ffff97cdaf200000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 000000c42072a000 CR3: 00000001b020a002 CR4: 00000000000606f0
kernel: Call Trace:
kernel:  delayed_ref_async_start+0x8d/0xa0 [btrfs]
kernel:  btrfs_scrubparity_helper+0x72/0x2d0 [btrfs]
kernel:  process_one_work+0x1ca/0x3c0
kernel:  worker_thread+0x47/0x3f0
kernel:  kthread+0xfc/0x130
kernel:  ? process_one_work+0x3c0/0x3c0
kernel:  ? kthread_create_on_node+0x40/0x40
kernel:  ret_from_fork+0x3a/0x50
kernel: Code: c7 c6 40 b8 d1 c0 48 89 df 44 89 04 24 e8 d9 36 09 00 44 8b 04 24 eb 8d 44 89 c6 48 c7 c7 d8 27 d2 c0 44 89 04 24 e8 3f ce 62 ea <0f> 0b 44 8b 04 24 eb c4 66 90 66 2e 0f 1f 84 00 00 00 00 00 e8 
kernel: ---[ end trace fc99e0a359d12e2f ]---
kernel: BTRFS: error (device sdc1) in btrfs_run_delayed_refs:3089: errno=-22 unknown
kernel: BTRFS info (device sdc1): forced readonly
kernel: BTRFS error (device sdc1): pending csums is 77824