While writing to a BTRFS filesystem on an LVM-LV with an MD-RAID10 with two
failed disks as physical device the following error occurred (the VG seems
non-operable, while the MD is listed as "active"):
May 02 09:43:21 rkdvmss1 kernel: BTRFS: bdev /dev/mapper/FC300R10-lvol1 errs:
wr 30510, rd 0, flush 0, corrupt 0, gen 0
May 02 09:43:22 rkdvmss1 kernel: ------------[ cut here ]------------
May 02 09:43:22 rkdvmss1 kernel: kernel BUG at ../mm/page-writeback.c:2286!
May 02 09:43:22 rkdvmss1 kernel: invalid opcode: 0000 [#1] PREEMPT SMP 
May 02 09:43:22 rkdvmss1 kernel: Modules linked in: fuse af_packet nf_log_ipv6
xt_pkttype nf_log_ipv4 nf_log_common xt_LOG xt_limit iscsi_ibft
iscsi_boot_sysfs ip6t_REJECT nf_reject_ipv6 xt_tcpudp nf_conntrack_ipv6
nf_defrag_ipv6 ip6table_raw ipt_REJECT nf_reject_ipv4 iptable_raw xt_CT
iptable_filter ip6table_mangle nf_conntrack_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 raid10 iTCO_wdt
iTCO_vendor_support gpio_ich coretemp joydev kvm_intel i5000_edac kvm pcspkr
serio_raw hpwdt lpc_ich mfd_core hpilo edac_core bnx2 i5k_amb md_mod ipmi_ssif
8250_fintek ipmi_si shpchp ipmi_msghandler acpi_cpufreq thermal button
processor btrfs xor raid6_pq hid_generic usbhid sr_mod cdrom ata_generic hpsa
ata_piix radeon i2c_algo_bit
May 02 09:43:23 rkdvmss1 kernel:  drm_kms_helper ttm drm ehci_pci uhci_hcd
ehci_hcd usbcore usb_common lpfc scsi_transport_fc cciss dm_mod sg
May 02 09:43:23 rkdvmss1 kernel: CPU: 1 PID: 19471 Comm: rsync Not tainted
4.1.20-11-default #1
May 02 09:43:23 rkdvmss1 kernel: Hardware name: HP ProLiant DL380 G5, BIOS P56
05/02/2011
May 02 09:43:23 rkdvmss1 kernel: task: ffff880032ad0490 ti: ffff880002718000
task.ti: ffff880002718000
May 02 09:43:23 rkdvmss1 kernel: RIP: 0010:[<ffffffff8117988a>] 
[<ffffffff8117988a>] clear_page_dirty_for_io+0xda/0xe0
May 02 09:43:23 rkdvmss1 kernel: RSP: 0018:ffff88000271bc68  EFLAGS: 00010246
May 02 09:43:23 rkdvmss1 kernel: RAX: 003ffff000000846 RBX: ffffea00017da640
RCX: 0000000000000000
May 02 09:43:23 rkdvmss1 kernel: RDX: 0000000000000000 RSI: ffff880026b57678
RDI: ffffea00017da640
May 02 09:43:23 rkdvmss1 kernel: RBP: ffff8800046a1af8 R08: 0000000000000010
R09: 0000000000000000
May 02 09:43:23 rkdvmss1 kernel: R10: 000060ff8041bbf0 R11: ffff8800046a19a0
R12: 0000000000000001
May 02 09:43:23 rkdvmss1 kernel: R13: ffff88006edd2100 R14: 0000000000000001
R15: ffff88000271bd60
May 02 09:43:23 rkdvmss1 kernel: FS:  00007f0305df6700(0000)
GS:ffff88007f840000(0000) knlGS:0000000000000000
May 02 09:43:23 rkdvmss1 kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
May 02 09:43:23 rkdvmss1 kernel: CR2: 000055d6eab00fe8 CR3: 000000000f88f000
CR4: 00000000000006e0
May 02 09:43:23 rkdvmss1 kernel: Stack:
May 02 09:43:23 rkdvmss1 kernel:  ffff88006edd2100 ffff88006edd2100
0000000000000000 ffffffffa05646ce
May 02 09:43:23 rkdvmss1 kernel:  ffff88000271bd58 0000000000000050
0000000000000000 0000000000002fff
May 02 09:43:23 rkdvmss1 kernel:  ffff8800046a19a0 0000000000001000
0000000000000000 0000000000000001
May 02 09:43:23 rkdvmss1 kernel: Call Trace:
May 02 09:43:23 rkdvmss1 kernel:  [<ffffffffa05646ce>]
lock_and_cleanup_extent_if_need+0x6e/0x210 [btrfs]
May 02 09:43:23 rkdvmss1 kernel:  [<ffffffffa0565874>]
__btrfs_buffered_write+0x1a4/0x580 [btrfs]
May 02 09:43:23 rkdvmss1 kernel:  [<ffffffffa0568f50>]
btrfs_file_write_iter+0x250/0x5e0 [btrfs]
May 02 09:43:23 rkdvmss1 kernel:  [<ffffffff811dec7f>] __vfs_write+0xaf/0x100
May 02 09:43:23 rkdvmss1 kernel:  [<ffffffff811df294>] vfs_write+0xa4/0x1b0
May 02 09:43:23 rkdvmss1 kernel:  [<ffffffff811e0002>] SyS_write+0x42/0xb0
May 02 09:43:23 rkdvmss1 kernel:  [<ffffffff81664f32>]
system_call_fastpath+0x16/0x75
May 02 09:43:23 rkdvmss1 kernel:  [<00007f0305300cd0>] 0x7f0305300cd0
May 02 09:43:23 rkdvmss1 kernel: Code: 00 48 89 df e8 b8 da 02 00 85 c0 75 14
f0 0f ba 33 04 72 85 e9 74 ff ff ff 0f 1f 84 00 00 00 00 00 48 89 df e8 f8 f9
ff ff eb e2 <0f> 0b 0f 1f 40 00 66 66 66 66 90 41 57 49 89 f7 41 56 41 55 41 
May 02 09:43:23 rkdvmss1 kernel: RIP  [<ffffffff8117988a>]
clear_page_dirty_for_io+0xda/0xe0
May 02 09:43:23 rkdvmss1 kernel:  RSP <ffff88000271bc68>
May 02 09:43:23 rkdvmss1 kernel: ---[ end trace c6eadc3804bf04a0 ]---