[LU-15127] import invalidation vs writeback deadlock

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Affects Version/s: Upstream
• Severity: 3
• Assignee: Patrick Farrell
• Reporter: Alex Zhuravlev

Description

racer hits this deadlock few times a day:

schedule,osc_extent_wait,osc_cache_wait_range,osc_cache_writeback_range,osc_io_fsync_start,cl_io_start,lov_io_call,cl_io_start,cl_io_loop,cl_sync_file_range,ll_delete_inode,evict,__dentry_kill,dentry_kill,dput,ll_dirty_page_discard_warn,vvp_page_completion_write,cl_page_completion,osc_ap_completion,osc_extent_finish,brw_interpret,ptlrpc_check_set,ptlrpcd
	PIDs(1): "ptlrpcd_00_00":4889 

schedule,osc_extent_wait,osc_cache_wait_range,osc_cache_writeback_range,osc_ldlm_blocking_ast,ldlm_cancel_callback,ldlm_cli_cancel_local,ldlm_cli_cancel,osc_ldlm_blocking_ast,ldlm_handle_bl_callback,ldlm_bl_thread_main
	PIDs(1): "ldlm_bl_02":7759 

schedule,ptlrpc_invalidate_import,ptlrpc_invalidate_import_thread
	PIDs(1): "ll_imp_inval":293752 

schedule,ptlrpc_invalidate_import,ptlrpc_set_import_active,osc_iocontrol,lov_iocontrol,ll_umount_begin,ksys_umount,__x64_sys_umount
	PIDs(1): "umount":449648 

Issue Links

• duplicates: LU-12522 Deadlock: ptlrpcd daemon blocked in osc_extent_wait
• is related to: LU-15340 client stuck unable to complete eviction with "still on delayed list" messages printed