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] [<ffffffff815f7ef9>] schedule+0x29/0x70 [57623.821280] [<ffffffff815fa91c>] schedule_timeout+0x1fc/0x260 [57623.894211] [<ffffffff8108beaa>] ? __queue_delayed_work+0xaa/0x1a0 [57623.967373] [<ffffffff8108b882>] ? try_to_grab_pending+0x102/0x150 [57624.042693] [<ffffffff815f91a6>] wait_for_completion+0x96/0x100 [57624.113736] [<ffffffff8109dd90>] ? try_to_wake_up+0x310/0x310 [57624.185449] [<ffffffff811cbd86>] writeback_inodes_sb_nr+0x86/0xb0 [57624.255713] [<ffffffffa01cd4a8>] flush_space+0x408/0x480 [btrfs] [57624.321342] [<ffffffffa01c7aa0>] ? btrfs_get_alloc_profile+0x30/0x40 [btrfs] [57624.389582] [<ffffffffa01c7b0f>] ? can_overcommit+0x5f/0x100 [btrfs] [57624.454281] [<ffffffffa01cd726>] reserve_metadata_bytes+0x206/0x490 [btrfs] [57624.517303] [<ffffffffa021cf34>] ? btrfs_clear_lock_blocking_rw+0x54/0x100 [btrfs] [57624.587297] [<ffffffffa01cde78>] btrfs_block_rsv_add+0x38/0x60 [btrfs] [57624.656038] [<ffffffffa01bcd8b>] ? btrfs_search_slot+0x89b/0xa10 [btrfs] [57624.722189] [<ffffffffa01e2cf3>] start_transaction+0x473/0x5c0 [btrfs] [57624.794538] [<ffffffffa01e316b>] btrfs_start_transaction+0x1b/0x20 [btrfs] [57624.865341] [<ffffffffa0216c14>] btrfs_clone+0x5b4/0x1070 [btrfs] [57624.935456] [<ffffffffa0217b4f>] btrfs_ioctl_clone+0x47f/0x4f0 [btrfs] [57625.004768] [<ffffffff811b0ec6>] ? do_last.isra.62+0x286/0xce0 [57625.076043] [<ffffffffa021beb1>] btrfs_ioctl+0x18e1/0x28f0 [btrfs] [57625.144157] [<ffffffff811b23be>] ? path_openat+0xbe/0x600 [57625.209512] [<ffffffff810fbe12>] ? from_kgid+0x12/0x20 [57625.275033] [<ffffffff810fbe2e>] ? from_kgid_munged+0xe/0x20 [57625.340483] [<ffffffff811035fc>] ? acct_account_cputime+0x1c/0x20 [57625.403169] [<ffffffff811b6539>] do_vfs_ioctl+0x439/0x500 [57625.463798] [<ffffffff810a1b84>] ? vtime_account_user+0x44/0x60 [57625.520728] [<ffffffff81011528>] ? syscall_trace_enter_phase1+0xf8/0x160 [57625.578309] [<ffffffff811b664c>] SyS_ioctl+0x4c/0x90 [57625.635960] [<ffffffff815fc01d>] ? int_check_syscall_exit_work+0x34/0x3d [57625.694317] [<ffffffff815fbdf2>] system_call_fastpath+0x12/0x17 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
