Hi everyone:
I create a target using fileio as the backend storage on ARM64 server. The
initiator reported some errors showed bellow  while perform iozone test.

[178444.145679]  connection14:0: ping timeout of 5 secs expired, recv
timeout 5, last rx 4339462894, last ping 4339464146, now 4339465400
[178444.145706]  connection14:0: detected conn error (1011)
[178469.674313]  connection14:0: detected conn error (1020)
[178504.420979]  connection14:0: ping timeout of 5 secs expired, recv
timeout 5, last rx 4339477953, last ping 4339479204, now 4339480456
[178504.421001]  connection14:0: detected conn error (1011)
[178532.064262]  connection14:0: detected conn error (1020)
[178564.584087]  connection14:0: ping timeout of 5 secs expired, recv
timeout 5, last rx 4339492980, last ping 4339494232, now 4339495484
..............................

I try to trace the function call of target iscsi. Then, I found the
 receiving  thread of target iscsi blocked at fd_execute_sync_cache ->
vfs_fsync_range. Further, vfs_fsync_range may takes more than 10 seconds to
return,while initiator Ping timeout would happened after 5 seconds.
vfs_fsync_range was call with the form vfs_fsync_range(fd_dev->fd_file, 0,
LLONG_MAX, 1) every times  which means sync all device cache.
So, is this a bug?
How  does Initiator send sync_cache scsi command?
Does it need to sync all device cache at once?
Any reply would be thankful.

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