Hi- This warning just popped on a stuck NFS/RDMA mount (the Ethernet switch port VLAN settings were not correct): Aug 20 17:12:05 bazille.1015granger.net kernel: workqueue: WQ_MEM_RECLAIM xprtiod:xprt_rdma_connect_worker [rpcrdma] is flushing !WQ_MEM_RECLAI> Aug 20 17:12:05 bazille.1015granger.net kernel: WARNING: CPU: 0 PID: 100 at kernel/workqueue.c:2628 check_flush_dependency+0xbf/0xca Aug 20 17:12:05 bazille.1015granger.net kernel: Workqueue: xprtiod xprt_rdma_connect_worker [rpcrdma] Aug 20 17:12:05 bazille.1015granger.net kernel: Call Trace: Aug 20 17:12:05 bazille.1015granger.net kernel: <TASK> Aug 20 17:12:05 bazille.1015granger.net kernel: __flush_work.isra.0+0xaf/0x188 Aug 20 17:12:05 bazille.1015granger.net kernel: ? _raw_spin_lock_irqsave+0x2c/0x37 Aug 20 17:12:05 bazille.1015granger.net kernel: ? lock_timer_base+0x38/0x5f Aug 20 17:12:05 bazille.1015granger.net kernel: __cancel_work_timer+0xea/0x13d Aug 20 17:12:05 bazille.1015granger.net kernel: ? preempt_latency_start+0x2b/0x46 Aug 20 17:12:05 bazille.1015granger.net kernel: rdma_addr_cancel+0x70/0x81 [ib_core] Aug 20 17:12:05 bazille.1015granger.net kernel: _destroy_id+0x1a/0x246 [rdma_cm] Aug 20 17:12:05 bazille.1015granger.net kernel: rpcrdma_xprt_connect+0x115/0x5ae [rpcrdma] Aug 20 17:12:05 bazille.1015granger.net kernel: ? _raw_spin_unlock+0x14/0x29 Aug 20 17:12:05 bazille.1015granger.net kernel: ? raw_spin_rq_unlock_irq+0x5/0x10 Aug 20 17:12:05 bazille.1015granger.net kernel: ? finish_task_switch.isra.0+0x171/0x249 Aug 20 17:12:05 bazille.1015granger.net kernel: xprt_rdma_connect_worker+0x3b/0xc7 [rpcrdma] Aug 20 17:12:05 bazille.1015granger.net kernel: process_one_work+0x1d8/0x2d4 Aug 20 17:12:05 bazille.1015granger.net kernel: worker_thread+0x18b/0x24f Aug 20 17:12:05 bazille.1015granger.net kernel: ? rescuer_thread+0x280/0x280 Aug 20 17:12:05 bazille.1015granger.net kernel: kthread+0xf4/0xfc Aug 20 17:12:05 bazille.1015granger.net kernel: ? kthread_complete_and_exit+0x1b/0x1b Aug 20 17:12:05 bazille.1015granger.net kernel: ret_from_fork+0x22/0x30 Aug 20 17:12:05 bazille.1015granger.net kernel: </TASK> At a guess, the recent changes to the WQ_MEM_RECLAIM settings in the RPC xprt code did not get carried over to rpcrdma... ? Need some guidance please, and I can write and test a fix for this. -- Chuck Lever
