On a system with many SAS targets, It appears possible that a
scsi_cmnd can time out without ever making it to the SAS LLDD or at
the same time that a completion is occurring.
in file sas_scsi_host.c :
/* Queue up, Direct Mode or Task Collector Mode. */
if (sas_ha->lldd_max_execute_num < 2)
res = i->dft->lldd_execute_task(task,
1, GFP_ATOMIC);
else
res = sas_queue_up(task);
If I set lldd_max_execute_num above 1, I find that libsas couldn't
queue a task to the SAS LLDD sometimes.
System will always report: not at initiator: EH_RESET_TIMER.
Is queue_thread pending? I will keep investigating.
--
Best Regards,
Ke Wei
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