On 2019/2/6 上午6:18, Stephen R. van den Berg wrote: > Are these Sysreq+w dumps not usable? > Sorry for the late reply. The hang looks pretty strange, and doesn't really look like previous deadlock caused by tree block locking. But some strange behavior about metadata dirty pages: This looks like to be the cause of the problem. kworker/u16:1 D 0 19178 2 0x80000000 Workqueue: btrfs-endio-write btrfs_endio_write_helper Call Trace: ? __schedule+0x4db/0x524 ? schedule+0x60/0x71 ? schedule_timeout+0xb2/0xec ? __next_timer_interrupt+0xae/0xae ? io_schedule_timeout+0x1b/0x3d ? balance_dirty_pages+0x7a7/0x861 ? usleep_range+0x7e/0x7e ? schedule+0x60/0x71 ? schedule_timeout+0x32/0xec ? balance_dirty_pages_ratelimited+0x204/0x225 ? btrfs_finish_ordered_io+0x584/0x5ac ? normal_work_helper+0xfe/0x243 ? process_one_work+0x18d/0x271 ? rescuer_thread+0x278/0x278 ? worker_thread+0x194/0x23f ? kthread+0xeb/0xf0 ? kthread_associate_blkcg+0x86/0x86 ? ret_from_fork+0x35/0x40 But I'm not familiar with balance_dirty_pages part, thus can't provide much details about this. Thanks, Qu
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