From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ph.de-nserver.de ([85.158.179.214]:46262 "EHLO mail-ph.de-nserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751442AbbHMH0R (ORCPT ); Thu, 13 Aug 2015 03:26:17 -0400 Message-ID: <55CC4697.4080102@profihost.ag> Date: Thu, 13 Aug 2015 09:26:15 +0200 From: Stefan Priebe - Profihost AG MIME-Version: 1.0 To: "linux-btrfs@vger.kernel.org" CC: fdmanana@suse.com, mfasheh@suse.de Subject: 4.2-rc6: cp reflink call trace Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: I'm getting the following trace on a daily basis when stacking a lot of cp --reflink commands. Somethinkg like: File a 80GB cp --reflink=always a b modify b cp --reflink=always b c modify c cp --reflink=always c d modify d ... [57623.099897] INFO: task cp:1319 blocked for more than 120 seconds. [57623.179331] Tainted: G W O 4.2-rc6 #1 [57623.259794] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [57623.343106] cp D ffff88085fcd1cc0 0 1319 1237 0x00000002 [57623.425986] ffff880040127798 0000000000000002 ffff880024590000 0000000000011cc0 [57623.507907] ffff880040127fd8 0000000000011cc0 ffff880854018000 ffff880024590000 [57623.588682] ffff880040127778 ffff8800401278b8 ffff8800401278c0 7fffffffffffffff [57623.669714] Call Trace: [57623.747413] [] schedule+0x29/0x70 [57623.821280] [] schedule_timeout+0x1fc/0x260 [57623.894211] [] ? __queue_delayed_work+0xaa/0x1a0 [57623.967373] [] ? try_to_grab_pending+0x102/0x150 [57624.042693] [] wait_for_completion+0x96/0x100 [57624.113736] [] ? try_to_wake_up+0x310/0x310 [57624.185449] [] writeback_inodes_sb_nr+0x86/0xb0 [57624.255713] [] flush_space+0x408/0x480 [btrfs] [57624.321342] [] ? btrfs_get_alloc_profile+0x30/0x40 [btrfs] [57624.389582] [] ? can_overcommit+0x5f/0x100 [btrfs] [57624.454281] [] reserve_metadata_bytes+0x206/0x490 [btrfs] [57624.517303] [] ? btrfs_clear_lock_blocking_rw+0x54/0x100 [btrfs] [57624.587297] [] btrfs_block_rsv_add+0x38/0x60 [btrfs] [57624.656038] [] ? btrfs_search_slot+0x89b/0xa10 [btrfs] [57624.722189] [] start_transaction+0x473/0x5c0 [btrfs] [57624.794538] [] btrfs_start_transaction+0x1b/0x20 [btrfs] [57624.865341] [] btrfs_clone+0x5b4/0x1070 [btrfs] [57624.935456] [] btrfs_ioctl_clone+0x47f/0x4f0 [btrfs] [57625.004768] [] ? do_last.isra.62+0x286/0xce0 [57625.076043] [] btrfs_ioctl+0x18e1/0x28f0 [btrfs] [57625.144157] [] ? path_openat+0xbe/0x600 [57625.209512] [] ? from_kgid+0x12/0x20 [57625.275033] [] ? from_kgid_munged+0xe/0x20 [57625.340483] [] ? acct_account_cputime+0x1c/0x20 [57625.403169] [] do_vfs_ioctl+0x439/0x500 [57625.463798] [] ? vtime_account_user+0x44/0x60 [57625.520728] [] ? syscall_trace_enter_phase1+0xf8/0x160 [57625.578309] [] SyS_ioctl+0x4c/0x90 [57625.635960] [] ? int_check_syscall_exit_work+0x34/0x3d [57625.694317] [] system_call_fastpath+0x12/0x17