B.H. Hello. I have btrfs volume used for backups. The configuration is as follows: # uname -a Linux yemot-4u 4.2.5-040205-generic #201510270124 SMP Tue Oct 27 01:25:49 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux # btrfs --version btrfs-progs v4.2.3 The volume is on top of 2 MD RAID10 arrays, 12TB each. Recently the server crashed with some weird kernel panic during rsyncing data to the backup volume. After reboot btrfs check passed without errors, also scrub finished with 0 errors. Yet, after resuming rsync the following errors appeared: [ 836.026606] BTRFS warning (device md1): block group 12969790406656 has wrong amount of free space [ 836.026610] BTRFS warning (device md1): failed to load free space cache for block group 12969790406656, rebuild it now [ 1033.619798] BTRFS warning (device md1): block group 15322358743040 has wrong amount of free space [ 1033.619801] BTRFS warning (device md1): failed to load free space cache for block group 15322358743040, rebuild it now [ 2052.843713] ------------[ cut here ]------------ [ 2052.843756] WARNING: CPU: 2 PID: 1725 at /home/kernel/COD/linux/fs/btrfs/extent-tree.c:2781 btrfs_run_delayed_refs.part.73+0x242/0x270 [btrfs]() [ 2052.843758] BTRFS: Transaction aborted (error -17) [ 2052.843760] Modules linked in: ipmi_ssif x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_codec_realtek snd_hda_codec_generic serio_raw ast sb_edac ttm snd_hda_intel edac_core joydev drm_kms_helper snd_hda_codec drm input_leds snd_hda_core snd_hwdep syscopyarea sysfillrect mei_me snd_pcm sysimgblt lpc_ich mei snd_timer snd soundcore ipmi_si wmi 8250_fintek ipmi_msghandler shpchp lp mac_hid parport btrfs ses enclosure raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 hid_generic igb i2c_algo_bit isci dca firewire_ohci usbhid ptp firewire_core raid0 libsas ahci hid psmouse multipath pps_core crc_itu_t libahci scsi_transport_sas aacraid linear [ 2052.843827] CPU: 2 PID: 1725 Comm: btrfs-transacti Not tainted 4.2.5-040205-generic #201510270124 [ 2052.843829] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./EPC602D8A, BIOS P1.20 04/16/2014 [ 2052.843832] 0000000000000000 00000000df907816 ffff8808414dfcb8 ffffffff817d8d6d [ 2052.843836] 0000000000000000 ffff8808414dfd10 ffff8808414dfcf8 ffffffff8107b3c6 [ 2052.843839] 0000000000001a0c ffff88049c5fe8a0 ffff88085577d800 ffff88082932cb80 [ 2052.843843] Call Trace: [ 2052.843852] [<ffffffff817d8d6d>] dump_stack+0x45/0x57 [ 2052.843858] [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0 [ 2052.843862] [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70 [ 2052.843878] [<ffffffffc022ecf2>] btrfs_run_delayed_refs.part.73+0x242/0x270 [btrfs] [ 2052.843882] [<ffffffff810e54bc>] ? del_timer_sync+0x4c/0x60 [ 2052.843897] [<ffffffffc022ed35>] btrfs_run_delayed_refs+0x15/0x20 [btrfs] [ 2052.843915] [<ffffffffc0243756>] btrfs_commit_transaction+0x56/0xb20 [btrfs] [ 2052.843931] [<ffffffffc023ee19>] transaction_kthread+0x229/0x240 [btrfs] [ 2052.843945] [<ffffffffc023ebf0>] ? btrfs_cleanup_transaction+0x550/0x550 [btrfs] [ 2052.843949] [<ffffffff8109a798>] kthread+0xd8/0xf0 [ 2052.843953] [<ffffffff8109a6c0>] ? kthread_create_on_node+0x1b0/0x1b0 [ 2052.843957] [<ffffffff817dff9f>] ret_from_fork+0x3f/0x70 [ 2052.843960] [<ffffffff8109a6c0>] ? kthread_create_on_node+0x1b0/0x1b0 [ 2052.843962] ---[ end trace 6575cf272a151e61 ]--- [ 2052.843966] BTRFS: error (device md1) in btrfs_run_delayed_refs:2781: errno=-17 Object already exists [ 2052.844024] BTRFS info (device md1): forced readonly [ 2052.848397] pending csums is 7327744 Then, during unmount: [25209.834767] BTRFS error (device md1): cleaner transaction attach returned -30 Any suggestions? -- "ויעקב הלך לדרכו..." משיח NOW! Moshiach is coming very soon, prepare yourself! יחי אדוננו מורינו ורבינו מלך המשיח לעולם ועד! -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
