On Mon, Sep 18, 2017 at 08:55:29AM +0000, Paul Jones wrote:
> Hi
>  I have a system that crashed during a defrag, upon reboot I got the 
> following trace while resuming the defrag.
> Filesystem is BTRFS Raid1 on lvm+cache, kernel 4.13.2
> Check --repair gives lots of warnings about parent transid verify failed, but 
> otherwise completes without issue.
> 
> Ran scrub which seems to have fixed most of the issues without crashing:
> 
> scrub status for d844164a-239e-4f37-9126-d3b2f3ab72be
>         scrub started at Mon Sep 18 15:59:05 2017 and finished after 02:04:00
>         total bytes scrubbed: 2.22TiB with 22890 errors
>         error details: verify=1078 csum=21812
>         corrected errors: 22886, uncorrectable errors: 4, unverified errors: 0
> 
> I'll see how it goes when I use rsync to verify from the other backup.
> 
> Thanks,
> Paul.
> 
> <...>
> [  136.376559] BTRFS info (device dm-15): read error corrected: ino 0 off 
> 6517887115264 (dev /dev/mapper/lvmB-backup--b sector 178527312)
> [  136.376659] BTRFS info (device dm-15): read error corrected: ino 0 off 
> 6517887119360 (dev /dev/mapper/lvmB-backup--b sector 178527320)
> [  174.761517] BTRFS warning (device dm-15): csum failed root 7692 ino 534939 
> off 5639217152 csum 0xdbbb090f expected csum 0x74d6a9b2 mirror 0
> [  174.761800] BTRFS warning (device dm-15): csum failed root 7692 ino 534939 
> off 5639217152 csum 0xdbbb090f expected csum 0x74d6a9b2 mirror 0
> [  174.761838] BTRFS warning (device dm-15): csum failed root 7692 ino 534939 
> off 5639217152 csum 0xdbbb090f expected csum 0x74d6a9b2 mirror 0
> [  174.761880] BTRFS warning (device dm-15): csum failed root 7692 ino 534939 
> off 5639217152 csum 0xdbbb090f expected csum 0x74d6a9b2 mirror 0
> [  174.761924] BTRFS warning (device dm-15): csum failed root 7692 ino 534939 
> off 5639217152 csum 0xdbbb090f expected csum 0x74d6a9b2 mirror 0

This 'mirror 0' looks fishy, (as mirror comes from
btrfs_io_bio->mirror_num, which should be at least 1 if raid1 setup is
in use.)

Not sure if 4.13.2-gentoo made any changes on btrfs, but can you
please verify with the upstream kernel, say, v4.13?


Thanks,

-liubo

> [  174.761986] ------------[ cut here ]------------
> [  174.761987] kernel BUG at fs/btrfs/extent_io.c:1989!
> [  174.761989] invalid opcode: 0000 [#1] SMP
> [  174.762034] Modules linked in: cls_u32 sch_htb sch_sfq nf_conntrack_pptp 
> nf_conntrack_proto_gre nf_conntrack_sane nf_conntrack_sip ts_kmp 
> nf_conntrack_amanda nf_conntrack_snmp nf_conntrack_h323 
> nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_tftp 
> nf_conntrack_ftp nf_conntrack_irc xt_NETMAP xt_TCPMSS xt_CHECKSUM 
> ipt_rpfilter xt_DSCP xt_dscp xt_statistic xt_CT xt_AUDIT xt_NFLOG xt_time 
> xt_connlimit xt_realm xt_NFQUEUE xt_tcpmss xt_addrtype xt_pkttype iptable_raw 
> xt_TPROXY nf_defrag_ipv6 xt_CLASSIFY xt_mark xt_hashlimit xt_comment 
> xt_length xt_connmark xt_owner xt_recent xt_iprange xt_physdev xt_policy 
> iptable_mangle xt_nat xt_multiport xt_conntrack ipt_REJECT nf_reject_ipv4 
> ipt_MASQUERADE nf_nat_masquerade_ipv4 ipt_ECN ipt_CLUSTERIP ipt_ah 
> iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4
> [  174.762144]  nf_nat
> [  174.762145] ------------[ cut here ]------------
> [  174.762145] kernel BUG at fs/btrfs/extent_io.c:1989!
> [  174.762267] ------------[ cut here ]------------
> [  174.762268] kernel BUG at fs/btrfs/extent_io.c:1989!
> [  174.762334] ------------[ cut here ]------------
> [  174.762335] kernel BUG at fs/btrfs/extent_io.c:1989!
> [  174.762487]  iptable_filter ip_tables nfsd auth_rpcgss oid_registry 
> nfs_acl binfmt_misc dm_cache_smq dm_cache dm_persistent_data dm_bufio 
> dm_bio_prison k10temp intel_powerclamp coretemp pcbc hwmon_vid iTCO_wdt 
> iTCO_vendor_support aesni_intel crypto_simd cryptd glue_helper pcspkr lpc_ich 
> i2c_i801 mfd_core xts aes_x86_64 cbc sha512_generic iscsi_tcp libiscsi_tcp 
> libiscsi scsi_transport_iscsi ixgb macvlan igb dca i2c_algo_bit e1000 atl1c 
> fuse nfs lockd grace sunrpc dm_mirror dm_region_hash dm_log dm_mod 
> hid_sunplus hid_sony hid_samsung hid_pl hid_petalynx hid_gyration 
> xhci_plat_hcd ohci_pci ohci_hcd uhci_hcd usb_storage megaraid_sas 
> megaraid_mbox megaraid_mm megaraid mptsas scsi_transport_sas mptspi 
> scsi_transport_spi mptscsih mptbase sata_inic162x ata_piix sata_nv sata_sil24 
> pata_jmicron pata_amd pata_mpiix
> [  174.762629]  usbhid ahci libahci xhci_pci r8169 ehci_pci xhci_hcd mii 
> ehci_hcd
> [  174.762682] CPU: 5 PID: 6683 Comm: kworker/u16:22 Not tainted 
> 4.13.2-gentoo #5
> [  174.762730] Hardware name: System manufacturer System Product Name/P8Z68-V 
> LE, BIOS 4101 05/09/2013
> [  174.762786] Workqueue: btrfs-endio btrfs_endio_helper
> [  174.762833] task: ffff8803e315d240 task.stack: ffffc900008c4000
> [  174.762883] RIP: 0010:repair_io_failure+0x1b5/0x200
> [  174.762930] RSP: 0018:ffffc900008c7c78 EFLAGS: 00010246
> [  174.762978] RAX: ffff8803b71ba480 RBX: 0000000000000000 RCX: 
> 0000000000001000
> [  174.763027] RDX: 0000000000000000 RSI: 000000000008299b RDI: 
> ffff88040b124000
> [  174.763075] RBP: ffffc900008c7cc8 R08: 00000002d14fa000 R09: 
> ffffea000b182d40
> [  174.763123] R10: ffffc900008c7b40 R11: 0000000000000000 R12: 
> 0000000000000000
> [  174.763171] R13: ffff8802e5d29628 R14: ffff88040b124000 R15: 
> ffffea000b182d40
> [  174.763220] FS:  0000000000000000(0000) GS:ffff88041ed40000(0000) 
> knlGS:0000000000000000
> [  174.763269] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  174.763316] CR2: 00000000005226e8 CR3: 0000000001a0a000 CR4: 
> 00000000001406a0
> [  174.763364] Call Trace:
> [  174.763412]  ? get_chunk_map+0x39/0xd0
> [  174.763460]  clean_io_failure+0x127/0x140
> [  174.763507]  end_bio_extent_readpage+0x248/0x4c0
> [  174.763556]  bio_endio+0x83/0x90
> [  174.763604]  end_workqueue_fn+0x38/0x40
> [  174.763651]  btrfs_worker_helper+0x191/0x1c0
> [  174.763698]  btrfs_endio_helper+0x9/0x10
> [  174.763746]  process_one_work+0x1b3/0x350
> [  174.763794]  worker_thread+0x42/0x3e0
> [  174.763841]  kthread+0x11a/0x130
> [  174.763888]  ? process_one_work+0x350/0x350
> [  174.763936]  ? kthread_create_on_node+0x40/0x40
> [  174.763993]  ret_from_fork+0x22/0x30
> [  174.764056] Code: 5f 44 e9 18 ff ff ff 48 8b 43 30 4d 89 f9 48 c7 c6 a8 2c 
> 97 81 4c 89 ef 48 8b 4d b0 48 8b 55 b8 4c 8d 40 10 e8 7d 10 fb ff eb 8d <0f> 
> 0b be 01 00 00 00 4c 89 ef 41 be fb ff ff ff e8 86 17 05 00
> [  174.764146] RIP: repair_io_failure+0x1b5/0x200 RSP: ffffc900008c7c78
> [  174.764195] invalid opcode: 0000 [#2] SMP
> [  174.764211] ---[ end trace 4dcb71dfc5702cb7 ]---
> [  174.764314] Modules linked in: cls_u32 sch_htb sch_sfq nf_conntrack_pptp 
> nf_conntrack_proto_gre nf_conntrack_sane nf_conntrack_sip ts_kmp 
> nf_conntrack_amanda nf_conntrack_snmp nf_conntrack_h323 
> nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_tftp 
> nf_conntrack_ftp nf_conntrack_irc xt_NETMAP xt_TCPMSS xt_CHECKSUM 
> ipt_rpfilter xt_DSCP xt_dscp xt_statistic xt_CT xt_AUDIT xt_NFLOG xt_time 
> xt_connlimit xt_realm xt_NFQUEUE xt_tcpmss xt_addrtype xt_pkttype iptable_raw 
> xt_TPROXY nf_defrag_ipv6 xt_CLASSIFY xt_mark xt_hashlimit xt_comment 
> xt_length xt_connmark xt_owner xt_recent xt_iprange xt_physdev xt_policy 
> iptable_mangle xt_nat xt_multiport xt_conntrack ipt_REJECT nf_reject_ipv4 
> ipt_MASQUERADE nf_nat_masquerade_ipv4 ipt_ECN ipt_CLUSTERIP ipt_ah 
> iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4
> [  174.764469]  nf_nat iptable_filter ip_tables nfsd auth_rpcgss oid_registry 
> nfs_acl binfmt_misc dm_cache_smq dm_cache dm_persistent_data dm_bufio 
> dm_bio_prison k10temp intel_powerclamp coretemp pcbc hwmon_vid iTCO_wdt 
> iTCO_vendor_support aesni_intel crypto_simd cryptd glue_helper pcspkr lpc_ich 
> i2c_i801 mfd_core xts aes_x86_64 cbc sha512_generic iscsi_tcp libiscsi_tcp 
> libiscsi scsi_transport_iscsi ixgb macvlan igb dca i2c_algo_bit e1000 atl1c 
> fuse nfs lockd grace sunrpc dm_mirror dm_region_hash dm_log dm_mod 
> hid_sunplus hid_sony hid_samsung hid_pl hid_petalynx hid_gyration 
> xhci_plat_hcd ohci_pci ohci_hcd uhci_hcd usb_storage megaraid_sas 
> megaraid_mbox megaraid_mm megaraid mptsas scsi_transport_sas mptspi 
> scsi_transport_spi mptscsih mptbase sata_inic162x ata_piix sata_nv sata_sil24 
> pata_jmicron pata_amd
> [  174.764628]  pata_mpiix usbhid ahci libahci xhci_pci r8169 ehci_pci 
> xhci_hcd mii ehci_hcd
> [  174.764632] CPU: 1 PID: 6673 Comm: kworker/u16:16 Tainted: G      D        
>  4.13.2-gentoo #5
> [  174.764633] Hardware name: System manufacturer System Product Name/P8Z68-V 
> LE, BIOS 4101 05/09/2013
> [  174.764634] Workqueue: btrfs-endio btrfs_endio_helper
> [  174.764635] task: ffff88040cbd3040 task.stack: ffffc9000045c000
> [  174.764636] RIP: 0010:repair_io_failure+0x1b5/0x200
> [  174.764637] RSP: 0018:ffffc9000045fc78 EFLAGS: 00010246
> [  174.764637] RAX: ffff8803dfd670c0 RBX: 0000000000000000 RCX: 
> 0000000000001000
> [  174.764638] RDX: 0000000000001000 RSI: 000000000008299b RDI: 
> ffff88040b124000
> [  174.764639] RBP: ffffc9000045fcc8 R08: 00000002d14fa000 R09: 
> ffffea000b182d80
> [  174.764640] R10: ffffc9000045fb40 R11: 0000000000000000 R12: 
> 0000000000001000
> [  174.764640] R13: ffff8802e5d29628 R14: ffff88040b124000 R15: 
> ffffea000b182d80
> [  174.764641] FS:  0000000000000000(0000) GS:ffff88041ec40000(0000) 
> knlGS:0000000000000000
> [  174.764641] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  174.764642] CR2: 00007f0df9020000 CR3: 0000000001a0a000 CR4: 
> 00000000001406a0
> [  174.764643] Call Trace:
> [  174.764644]  ? get_chunk_map+0x39/0xd0
> [  174.764645]  clean_io_failure+0x127/0x140
> [  174.764646]  end_bio_extent_readpage+0x248/0x4c0
> [  174.764647]  bio_endio+0x83/0x90
> [  174.764649]  end_workqueue_fn+0x38/0x40
> [  174.764650]  btrfs_worker_helper+0x191/0x1c0
> [  174.764651]  btrfs_endio_helper+0x9/0x10
> [  174.764653]  process_one_work+0x1b3/0x350
> [  174.764653]  worker_thread+0x42/0x3e0
> [  174.764655]  kthread+0x11a/0x130
> [  174.764655]  ? process_one_work+0x350/0x350
> [  174.764657]  ? kthread_create_on_node+0x40/0x40
> [  174.764658]  ret_from_fork+0x22/0x30
> [  174.764659] Code: 5f 44 e9 18 ff ff ff 48 8b 43 30 4d 89 f9 48 c7 c6 a8 2c 
> 97 81 4c 89 ef 48 8b 4d b0 48 8b 55 b8 4c 8d 40 10 e8 7d 10 fb ff eb 8d <0f> 
> 0b be 01 00 00 00 4c 89 ef 41 be fb ff ff ff e8 86 17 05 00
> [  174.764672] RIP: repair_io_failure+0x1b5/0x200 RSP: ffffc9000045fc78
> [  174.764673] invalid opcode: 0000 [#3] SMP
> [  174.764674] Modules linked in: cls_u32 sch_htb sch_sfq nf_conntrack_pptp 
> nf_conntrack_proto_gre nf_conntrack_sane nf_conntrack_sip ts_kmp
> [  174.764677] ---[ end trace 4dcb71dfc5702cb8 ]---
> [  174.764677]  nf_conntrack_amanda nf_conntrack_snmp nf_conntrack_h323 
> nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_tftp 
> nf_conntrack_ftp nf_conntrack_irc xt_NETMAP xt_TCPMSS xt_CHECKSUM 
> ipt_rpfilter xt_DSCP xt_dscp xt_statistic xt_CT xt_AUDIT xt_NFLOG xt_time 
> xt_connlimit xt_realm xt_NFQUEUE xt_tcpmss xt_addrtype xt_pkttype iptable_raw 
> xt_TPROXY nf_defrag_ipv6 xt_CLASSIFY xt_mark xt_hashlimit xt_comment 
> xt_length xt_connmark xt_owner xt_recent xt_iprange xt_physdev xt_policy 
> iptable_mangle xt_nat xt_multiport xt_conntrack ipt_REJECT nf_reject_ipv4 
> ipt_MASQUERADE nf_nat_masquerade_ipv4 ipt_ECN ipt_CLUSTERIP ipt_ah 
> iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat 
> iptable_filter ip_tables nfsd auth_rpcgss oid_registry nfs_acl binfmt_misc 
> dm_cache_smq dm_cache dm_persistent_data
> [  174.764694]  dm_bufio dm_bio_prison k10temp intel_powerclamp coretemp pcbc 
> hwmon_vid iTCO_wdt iTCO_vendor_support aesni_intel crypto_simd cryptd 
> glue_helper pcspkr lpc_ich i2c_i801 mfd_core xts aes_x86_64 cbc 
> sha512_generic iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ixgb 
> macvlan igb dca i2c_algo_bit e1000 atl1c fuse nfs lockd grace sunrpc 
> dm_mirror dm_region_hash dm_log dm_mod hid_sunplus hid_sony hid_samsung 
> hid_pl hid_petalynx hid_gyration xhci_plat_hcd ohci_pci ohci_hcd uhci_hcd 
> usb_storage megaraid_sas megaraid_mbox megaraid_mm megaraid mptsas 
> scsi_transport_sas mptspi scsi_transport_spi mptscsih mptbase sata_inic162x 
> ata_piix sata_nv sata_sil24 pata_jmicron pata_amd pata_mpiix usbhid ahci 
> libahci xhci_pci r8169 ehci_pci xhci_hcd mii ehci_hcd
> [  174.764718] CPU: 3 PID: 53 Comm: kworker/u16:2 Tainted: G      D         
> 4.13.2-gentoo #5
> [  174.764718] Hardware name: System manufacturer System Product Name/P8Z68-V 
> LE, BIOS 4101 05/09/2013
> [  174.764720] Workqueue: btrfs-endio btrfs_endio_helper
> [  174.764721] task: ffff88040cb62ec0 task.stack: ffffc900001f4000
> [  174.764723] RIP: 0010:repair_io_failure+0x1b5/0x200
> [  174.764724] RSP: 0018:ffffc900001f7c78 EFLAGS: 00010246
> [  174.764725] RAX: ffff8802e0013fc0 RBX: 0000000000000000 RCX: 
> 0000000000001000
> [  174.764726] RDX: 0000000000002000 RSI: 000000000008299b RDI: 
> ffff88040b124000
> [  174.764727] RBP: ffffc900001f7cc8 R08: 00000002d14fa000 R09: 
> ffffea000b182dc0
> [  174.764727] R10: ffffc900001f7c18 R11: 0000000000000000 R12: 
> 0000000000002000
> [  174.764728] R13: ffff8802e5d29628 R14: ffff88040b124000 R15: 
> ffffea000b182dc0
> [  174.764729] FS:  0000000000000000(0000) GS:ffff88041ecc0000(0000) 
> knlGS:0000000000000000
> [  174.764730] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  174.764731] CR2: 0000000000523368 CR3: 0000000001a0a000 CR4: 
> 00000000001406a0
> [  174.764731] Call Trace:
> [  174.764733]  ? get_chunk_map+0x39/0xd0
> [  174.764735]  clean_io_failure+0x127/0x140
> [  174.764736]  end_bio_extent_readpage+0x248/0x4c0
> [  174.764738]  bio_endio+0x83/0x90
> [  174.764739]  end_workqueue_fn+0x38/0x40
> [  174.764740]  btrfs_worker_helper+0x191/0x1c0
> [  174.764742]  btrfs_endio_helper+0x9/0x10
> [  174.764743]  process_one_work+0x1b3/0x350
> [  174.764744]  worker_thread+0x42/0x3e0
> [  174.764746]  kthread+0x11a/0x130
> [  174.764747]  ? process_one_work+0x350/0x350
> [  174.764748]  ? kthread_create_on_node+0x40/0x40
> [  174.764750]  ret_from_fork+0x22/0x30
> [  174.764750] Code: 5f 44 e9 18 ff ff ff 48 8b 43 30 4d 89 f9 48 c7 c6 a8 2c 
> 97 81 4c 89 ef 48 8b 4d b0 48 8b 55 b8 4c 8d 40 10 e8 7d 10 fb ff eb 8d <0f> 
> 0b be 01 00 00 00 4c 89 ef 41 be fb ff ff ff e8 86 17 05 00
> [  174.764768] RIP: repair_io_failure+0x1b5/0x200 RSP: ffffc900001f7c78
> [  174.764769] invalid opcode: 0000 [#4] SMP
> [  174.764769] Modules linked in: cls_u32 sch_htb sch_sfq nf_conntrack_pptp 
> nf_conntrack_proto_gre nf_conntrack_sane nf_conntrack_sip ts_kmp 
> nf_conntrack_amanda nf_conntrack_snmp nf_conntrack_h323 
> nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_tftp
> [  174.764773] ---[ end trace 4dcb71dfc5702cb9 ]---
> [  174.764773]  nf_conntrack_ftp nf_conntrack_irc xt_NETMAP xt_TCPMSS 
> xt_CHECKSUM ipt_rpfilter xt_DSCP xt_dscp xt_statistic xt_CT xt_AUDIT xt_NFLOG 
> xt_time xt_connlimit xt_realm xt_NFQUEUE xt_tcpmss xt_addrtype xt_pkttype 
> iptable_raw xt_TPROXY nf_defrag_ipv6 xt_CLASSIFY xt_mark xt_hashlimit 
> xt_comment xt_length xt_connmark xt_owner xt_recent xt_iprange xt_physdev 
> xt_policy iptable_mangle xt_nat xt_multiport xt_conntrack ipt_REJECT 
> nf_reject_ipv4 ipt_MASQUERADE nf_nat_masquerade_ipv4 ipt_ECN ipt_CLUSTERIP 
> ipt_ah iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat 
> iptable_filter ip_tables nfsd auth_rpcgss oid_registry nfs_acl binfmt_misc 
> dm_cache_smq dm_cache dm_persistent_data dm_bufio dm_bio_prison k10temp 
> intel_powerclamp coretemp pcbc hwmon_vid iTCO_wdt iTCO_vendor_support 
> aesni_intel
> [  174.764791]  crypto_simd cryptd glue_helper pcspkr lpc_ich i2c_i801 
> mfd_core xts aes_x86_64 cbc sha512_generic iscsi_tcp libiscsi_tcp libiscsi 
> scsi_transport_iscsi ixgb macvlan igb dca i2c_algo_bit e1000 atl1c fuse nfs 
> lockd grace sunrpc dm_mirror dm_region_hash dm_log dm_mod hid_sunplus 
> hid_sony hid_samsung hid_pl hid_petalynx hid_gyration xhci_plat_hcd ohci_pci 
> ohci_hcd uhci_hcd usb_storage megaraid_sas megaraid_mbox megaraid_mm megaraid 
> mptsas scsi_transport_sas mptspi scsi_transport_spi mptscsih mptbase 
> sata_inic162x ata_piix sata_nv sata_sil24 pata_jmicron pata_amd pata_mpiix 
> usbhid ahci libahci xhci_pci r8169 ehci_pci xhci_hcd mii ehci_hcd
> [  174.764806] CPU: 7 PID: 4214 Comm: kworker/u16:12 Tainted: G      D        
>  4.13.2-gentoo #5
> [  174.764807] Hardware name: System manufacturer System Product Name/P8Z68-V 
> LE, BIOS 4101 05/09/2013
> [  174.764808] Workqueue: btrfs-endio btrfs_endio_helper
> [  174.764808] task: ffff88040c282d00 task.stack: ffffc900166ec000
> [  174.764809] RIP: 0010:repair_io_failure+0x1b5/0x200
> [  174.764810] RSP: 0018:ffffc900166efc78 EFLAGS: 00010246
> [  174.764810] RAX: ffff88040aa51c80 RBX: 0000000000000000 RCX: 
> 0000000000001000
> [  174.764811] RDX: 0000000000003000 RSI: 000000000008299b RDI: 
> ffff88040b124000
> [  174.764811] RBP: ffffc900166efcc8 R08: 00000002d14fa000 R09: 
> ffffea000b182e00
> [  174.764812] R10: ffffc900166efc18 R11: 0000000000000000 R12: 
> 0000000000003000
> [  174.764812] R13: ffff8802e5d29628 R14: ffff88040b124000 R15: 
> ffffea000b182e00
> [  174.764812] FS:  0000000000000000(0000) GS:ffff88041edc0000(0000) 
> knlGS:0000000000000000
> [  174.764813] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [  174.764813] CR2: 0000000000513000 CR3: 0000000001a0a000 CR4: 
> 00000000001406a0
> [  174.764814] Call Trace:
> [  174.764815]  ? get_chunk_map+0x39/0xd0
> [  174.764816]  clean_io_failure+0x127/0x140
> [  174.764817]  end_bio_extent_readpage+0x248/0x4c0
> [  174.764818]  bio_endio+0x83/0x90
> [  174.764819]  end_workqueue_fn+0x38/0x40
> [  174.764820]  btrfs_worker_helper+0x191/0x1c0
> [  174.764821]  btrfs_endio_helper+0x9/0x10
> [  174.764821]  process_one_work+0x1b3/0x350
> [  174.764822]  worker_thread+0x42/0x3e0
> [  174.764823]  kthread+0x11a/0x130
> [  174.764824]  ? process_one_work+0x350/0x350
> [  174.764825]  ? kthread_create_on_node+0x40/0x40
> [  174.764826]  ret_from_fork+0x22/0x30
> [  174.764827] Code: 5f 44 e9 18 ff ff ff 48 8b 43 30 4d 89 f9 48 c7 c6 a8 2c 
> 97 81 4c 89 ef 48 8b 4d b0 48 8b 55 b8 4c 8d 40 10 e8 7d 10 fb ff eb 8d <0f> 
> 0b be 01 00 00 00 4c 89 ef 41 be fb ff ff ff e8 86 17 05 00
> [  174.764841] RIP: repair_io_failure+0x1b5/0x200 RSP: ffffc900166efc78
> [  174.764844] ---[ end trace 4dcb71dfc5702cba ]---
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