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Mar 29 14:15:25 ds4-ls0 kernel: [  348.873740] BTRFS: bdev (null) errs: wr 13870290, rd 9, flush 2798850, corrupt 0, gen 0
Mar 29 14:15:56 ds4-ls0 kernel: [  378.200362] BUG: unable to handle kernel NULL pointer dereference at 00000000000001f0
Mar 29 14:15:56 ds4-ls0 kernel: [  378.247660] IP: [<ffffffffa029e31e>] can_overcommit+0x1e/0xf0 [btrfs]
Mar 29 14:15:56 ds4-ls0 kernel: [  378.286458] PGD 0 
Mar 29 14:15:56 ds4-ls0 kernel: [  378.298675] Oops: 0000 [#1] SMP 
Mar 29 14:15:56 ds4-ls0 kernel: [  378.318289] Modules linked in: dm_crypt xts gf128mul algif_skcipher af_alg dm_mod ip6table_filter ip6_tables xt_tcpudp iptable_filter ip_tables x_tables binfmt_misc x86_pkg_temp_thermal intel_powerclamp intel_rapl coretemp ttm drm_kms_helper kvm_intel drm kvm iTCO_wdt iTCO_vendor_support i2c_algo_bit i2c_i801 crc32_pclmul evdev ghash_clmulni_intel joydev i2c_core pcspkr lpc_ich mfd_core cryptd psmouse serio_raw shpchp battery video tpm_tis processor button tpm loop ipmi_watchdog ipmi_si ipmi_poweroff ipmi_devintf ipmi_msghandler parport_pc ppdev lp parport autofs4 ext4 crc16 mbcache jbd2 btrfs xor raid6_pq ses enclosure sg usb_storage hid_generic sd_mod crc_t10dif usbhid crct10dif_generic hid ahci ehci_pci sata_sil24 ehci_hcd libahci libata crct10dif_pclmul e1000e crct10dif_common crc32c_intel ptp usbcore usb_common pps_core scsi_mod fan thermal thermal_sys
Mar 29 14:15:56 ds4-ls0 kernel: [  378.783115] CPU: 0 PID: 153 Comm: kworker/u8:13 Not tainted 3.16-2-amd64 #1 Debian 3.16.3-2
Mar 29 14:15:56 ds4-ls0 kernel: [  378.833241] Hardware name: Supermicro X9SCL/X9SCM/X9SCL/X9SCM, BIOS 2.0c 10/17/2013
Mar 29 14:15:56 ds4-ls0 kernel: [  378.879182] Workqueue: events_unbound btrfs_async_reclaim_metadata_space [btrfs]
Mar 29 14:15:56 ds4-ls0 kernel: [  378.923681] task: ffff88022405c290 ti: ffff8802244cc000 task.ti: ffff8802244cc000
Mar 29 14:15:56 ds4-ls0 kernel: [  378.968603] RIP: 0010:[<ffffffffa029e31e>]  [<ffffffffa029e31e>] can_overcommit+0x1e/0xf0 [btrfs]
Mar 29 14:15:56 ds4-ls0 kernel: [  379.021976] RSP: 0018:ffff8802244cfdb8  EFLAGS: 00010296
Mar 29 14:15:56 ds4-ls0 kernel: [  379.053851] RAX: 0000000001000000 RBX: ffff88021da0ae00 RCX: 0000000000000002
Mar 29 14:15:56 ds4-ls0 kernel: [  379.096669] RDX: 0000000000400000 RSI: 0000000000000000 RDI: 0000000000000000
Mar 29 14:15:56 ds4-ls0 kernel: [  379.139484] RBP: ffff88021da0ae00 R08: 0000000000000004 R09: 0000000000000008
Mar 29 14:15:56 ds4-ls0 kernel: [  379.182302] R10: ffffffff818e1600 R11: 0000000000000006 R12: ffff880214098000
Mar 29 14:15:56 ds4-ls0 kernel: [  379.225116] R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000100
Mar 29 14:15:56 ds4-ls0 kernel: [  379.267929] FS:  0000000000000000(0000) GS:ffff88022fc00000(0000) knlGS:0000000000000000
Mar 29 14:15:56 ds4-ls0 kernel: [  379.316485] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 29 14:15:56 ds4-ls0 kernel: [  379.350955] CR2: 00000000000001f0 CR3: 0000000001813000 CR4: 00000000001407f0
Mar 29 14:15:56 ds4-ls0 kernel: [  379.393774] Stack:
Mar 29 14:15:56 ds4-ls0 kernel: [  379.405885]  000000580e7eeae1 ffff88021da0ae00 0000000000000000 ffff880214098000
Mar 29 14:15:56 ds4-ls0 kernel: [  379.450728]  0000000000000000 ffff880214098f90 0000000000000100 ffffffffa029e940
Mar 29 14:15:56 ds4-ls0 kernel: [  379.495570]  ffff88021da0ae80 ffff880214098f90 ffff8802247e77c0 ffff880226cfec00
Mar 29 14:15:56 ds4-ls0 kernel: [  379.540414] Call Trace:
Mar 29 14:15:56 ds4-ls0 kernel: [  379.555149]  [<ffffffffa029e940>] ? btrfs_async_reclaim_metadata_space+0xa0/0x1e0 [btrfs]
Mar 29 14:15:56 ds4-ls0 kernel: [  379.604227]  [<ffffffff8107f4a2>] ? process_one_work+0x172/0x420
Mar 29 14:15:56 ds4-ls0 kernel: [  379.640259]  [<ffffffff8107fb35>] ? worker_thread+0x115/0x520
Mar 29 14:15:56 ds4-ls0 kernel: [  379.674750]  [<ffffffff8107fa20>] ? rescuer_thread+0x2d0/0x2d0
Mar 29 14:15:56 ds4-ls0 kernel: [  379.709761]  [<ffffffff81085dcd>] ? kthread+0xbd/0xe0
Mar 29 14:15:56 ds4-ls0 kernel: [  379.740090]  [<ffffffff81085d10>] ? kthread_create_on_node+0x180/0x180
Mar 29 14:15:56 ds4-ls0 kernel: [  379.779265]  [<ffffffff8150c1bc>] ? ret_from_fork+0x7c/0xb0
Mar 29 14:15:56 ds4-ls0 kernel: [  379.812715]  [<ffffffff81085d10>] ? kthread_create_on_node+0x180/0x180
Mar 29 14:15:56 ds4-ls0 kernel: [  379.851889] Code: 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 89 ce 41 55 49 89 fd 41 54 55 48 89 f5 31 f6 53 48 83 ec 08 <4c> 8b a7 f0 01 00 00 48 89 14Write failed: Broken pipe