Hello: Do you ever encountered a similar deadlock cephfs stack?
[Sat Oct 20 15:11:40 2018] INFO: task nfsd:27191 blocked for more than 120 seconds. [Sat Oct 20 15:11:40 2018] Tainted: G OE ------------ 4.14.0-49.el7.centos.x86_64 #1 [Sat Oct 20 15:11:40 2018] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [Sat Oct 20 15:11:40 2018] nfsd D 0 27191 2 0x80000080 [Sat Oct 20 15:11:40 2018] Call Trace: [Sat Oct 20 15:11:40 2018] __schedule+0x28d/0x880 [Sat Oct 20 15:11:40 2018] schedule+0x36/0x80 [Sat Oct 20 15:11:40 2018] rwsem_down_write_failed+0x20d/0x380 [Sat Oct 20 15:11:40 2018] ? ip_finish_output2+0x15d/0x390 [Sat Oct 20 15:11:40 2018] call_rwsem_down_write_failed+0x17/0x30 [Sat Oct 20 15:11:40 2018] down_write+0x2d/0x40 [Sat Oct 20 15:11:40 2018] ceph_write_iter+0x101/0xf00 [ceph] [Sat Oct 20 15:11:40 2018] ? __ceph_caps_issued_mask+0x1ed/0x200 [ceph] [Sat Oct 20 15:11:40 2018] ? nfsd_acceptable+0xa3/0xe0 [nfsd] [Sat Oct 20 15:11:40 2018] ? exportfs_decode_fh+0xd2/0x3e0 [Sat Oct 20 15:11:40 2018] ? nfsd_proc_read+0x1a0/0x1a0 [nfsd] [Sat Oct 20 15:11:40 2018] do_iter_readv_writev+0x10b/0x170 [Sat Oct 20 15:11:40 2018] do_iter_write+0x7f/0x190 [Sat Oct 20 15:11:40 2018] vfs_iter_write+0x19/0x30 [Sat Oct 20 15:11:40 2018] nfsd_vfs_write+0xc6/0x360 [nfsd] [Sat Oct 20 15:11:40 2018] nfsd4_write+0x1b8/0x260 [nfsd] [Sat Oct 20 15:11:40 2018] ? nfsd4_encode_operation+0x13f/0x1c0 [nfsd] [Sat Oct 20 15:11:40 2018] nfsd4_proc_compound+0x3e0/0x810 [nfsd] [Sat Oct 20 15:11:40 2018] nfsd_dispatch+0xc9/0x2f0 [nfsd] [Sat Oct 20 15:11:40 2018] svc_process_common+0x385/0x710 [sunrpc] [Sat Oct 20 15:11:40 2018] svc_process+0xfd/0x1c0 [sunrpc] [Sat Oct 20 15:11:40 2018] nfsd+0xf3/0x190 [nfsd] [Sat Oct 20 15:11:40 2018] kthread+0x109/0x140 [Sat Oct 20 15:11:40 2018] ? nfsd_destroy+0x60/0x60 [nfsd] [Sat Oct 20 15:11:40 2018] ? kthread_park+0x60/0x60 [Sat Oct 20 15:11:40 2018] ret_from_fork+0x25/0x30
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