https://bugzilla.kernel.org/show_bug.cgi?id=214147

--- Comment #4 from Badalian Slava (slavon.net@gmail.com) ---

I get some info .


Test case
have 2 zfs pool. HDD is zdev (raid6) SDD is stype.
simple copy from SSD to HDD

Specific^

1. I use NFS with RDMA and 16 threads (for linux hosts)
2/ i use targetcli and nvmet for share devs to WinClusteredHosts


When se get deadlock i see in perf

amples: 1M of event 'cycles', Event count (approx.): 711199023386
  Children      Self  Command          Shared Object             Symbol
-   30,57%     0,00%  z_wr_iss         [kernel.kallsyms]         [k]
ret_from_fork                                                                  
                                        ◆
     ret_from_fork                                                             
                                                                               
                             ▒
   - kthread                                                                   
                                                                               
                             ▒
      - 30,53% taskq_create                                                    
                                                                               
                             ▒
         - 16,50% zio_inject_init                                              
                                                                               
                             ▒
            - 4,77% 0xffffffffc0c7285f                                         
                                                                               
                             ▒
               - 4,73% raidz_rec_pr_coeff.isra.5                               
                                                                               
                             ▒
                  - 3,86% secpolicy_vnode_setid_retain                         
                                                                               
                             ▒
                     - 2,10% zthr_resume                                       
                                                                               
                             ▒
                        - 1,85% vdev_label_init                                
                                                                               
                             ▒
                           - 1,03% secpolicy_vnode_setid_retain                
                                                                               
                             ▒
                              - 0,73% zthr_cancel                              
                                                                               
                             ▒
                                   0,72% vdev_rebuild_update_sync              
                                                                               
                             ▒
                     - 1,57% zthr_cancel                                       
                                                                               
                             ▒
                        - 1,55% vdev_rebuild_update_sync                       
                                                                               
                             ▒
                             0,53% __mutex_lock.isra.13                        
                                                                               
                             ▒
                             0,53% avl_remove                                  
                                                                               
                             ▒
                    0,71% abd_bio_map_off                                      
                                                                               
                             ▒
            - 3,70% vdev_disk_open                                             
                                                                               
                             ▒
               - 3,69% range_tree_remove_impl                                  
                                                                               
                             ▒
                  - 3,45% range_tree_add_impl                                  
                                                                               
                             ▒
                     - 2,66% mmp_thread                                        
                                                                               
                             ▒
                          1,24% metaslab_enable                                
                                                                               
                             ▒
                          0,74% __mutex_lock.isra.13                           
                                                                               
                             ▒
            - 2,71% zvol_set_volsize                                           
                                                                               
                             ▒
               - 2,51% zfs_aclset_common                                       
                                                                               
                             ▒
                  - 2,51% metaslab_load.part.29                                
                                                                               
                             ▒
                       1,31% metaslab_class_evict_old                          
                                                                               
                             ▒
                       0,96% metaslab_unload.part.28                           
                                                                               
                             ▒
            - 1,84% zvol_set_volmode_sync_cb                                   
                                                                               
                             ▒
               - 1,83% zio_handle_device_injection_impl.part.15                
                                                                               
                             ▒
                  - 1,57% spl_taskq_fini                                       
                                                                               
                             ▒
                     - 1,55% _raw_spin_lock_irqsave                            
                                                                               
                             ▒
                          native_queued_spin_lock_slowpath                     
                                                                               
                             ▒
            - 1,20% zvol_set_volmode_sync                                      
                                                                               
                             ▒
                 1,02% l2arc_read_done                                         
                                                                               
                             ▒
            - 0,63% zio_inject_list_next                                       
                                                                               
                             ▒
               - 0,62% zfs_mode_compute                                        
                                                                               
                             ▒
                  - 0,59% zfs_mode_compute                                     
                                                                               
                             ▒
                       0,53% abd_iterate_func2.part.16                         
                                                                               
                             ▒
         - 12,00% _raw_spin_lock_irqsave                                       
                                                                               
                             ▒
              native_queued_spin_lock_slowpath                                 
                                                                               
                             ▒
         - 0,93% schedule                                                      
                                                                               
                             ▒
              0,86% __sched_text_start                                         
                                                                               
                             ▒
-   30,57%     0,00%  z_wr_iss         [kernel.kallsyms]         [k] kthread   
                                                                               
                             ▒
   - 30,57% kthread                                                            
                                                                               
                             ▒
      - 30,53% taskq_create                                                    
                                                                               
                             ▒
         - 16,50% zio_inject_init                                              
                                                                               
                             ▒
            - 4,77% 0xffffffffc0c7285f                                         
                                                                               
                             ▒
               - 4,73% raidz_rec_pr_coeff.isra.5                                


and  i see in 


[root@vm2 ~]# cat /proc/locks
1: FLOCK  ADVISORY  WRITE 999321 00:18:3499 0 EOF
2: POSIX  ADVISORY  WRITE 949090 00:18:3395 0 EOF
3: POSIX  ADVISORY  WRITE 949090 00:18:3394 0 EOF
4: POSIX  ADVISORY  WRITE 948911 00:18:3322 0 EOF
5: POSIX  ADVISORY  WRITE 999305 00:18:3511 0 EOF

butt one.one/two in ACTIVE state., pid is nfs5 kernel p[process. deadlocked  in
nfs!

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