Hi, we have found a deadlock recently due to that only the first task in the list of nfs_seqid_counter can be executed. T1 -- NFSPROC4_CLNT_LOCKU nfs4_locku_prepare nfs_wait_on_sequence list_add_tail // add to sequence->list // This is the first task. nfs4_locku_done nfs4_async_handle_exception rpc_sleep_on // Sleep on clp->cl_rpcwaitq, // and wait for being woken up by T2 <-------- can not get here --------> nfs_release_seqid rpc_wake_up_queued_task // wake up T2 T2 -- state manager nfs4_state_manager nfs4_do_reclaim nfs4_reclaim_open_state __nfs4_reclaim_open_state nfs40_open_expired nfs4_open_expired nfs4_do_open_expired _nfs4_open_expired nfs4_open_recover nfs4_open_recover_helper _nfs4_recover_proc_open nfs4_run_open_task ... nfs4_open_prepare nfs_wait_on_sequence list_add_tail // add to sequence->list // This is the second task. rpc_sleep_on // Sleep on sequence->wait, // and wait for being woken up by T1 <-------- can not get here --------> nfs4_clear_state_manager_bit rpc_wake_up // wake up T1 T1 occupies the first position of sequence->list and waits to be woken up by T2. T2 has to be woken up by T1 who occupies the first position. We haven't come up with a suitable solution yet. Any suggestions will be appreciated. Thanks.
