Hello Everybody,

I am investigating strange behaviour described here 
https://github.com/coreos/bugs/issues/2357 and would like to ask for 

It all boils down to:
  1. start server, login to all iscsi portals, no need to mount anything
  2. logout from all or one session
  3. every sessions makes kworker to spin. `l > /proc/sysrq-trigger` shows:

[19806.968333] Call Trace:
[19806.968347]  scsi_remove_device+0x19/0x60 [scsi_mod]
[19806.968354]  scsi_remove_target+0x167/0x1b0 [scsi_mod]
[19806.968355]  iscsi_free_session+0x383/0x430 [scsi_transport_iscsi]
[19806.968366]  process_one_work+0x144/0x350
[19806.968367]  worker_thread+0x4d/0x3e0
[19806.968369]  kthread+0xfc/0x130
[19806.968370]  ? rescuer_thread+0x310/0x310
[19806.968371]  ? kthread_park+0x60/0x60
[19806.968372]  ? do_syscall_64+0xe9/0x1c0
[19806.968374]  ret_from_fork+0x35/0x40

  4. if I do `multipath -F; for d in $(iscsiadm -m session -P3 |awk '/scsi 
disk/ {print $4}'); do echo 1 > /sys/block/$d/device/delete; done` before 
logging out, it works just fine
  5. it is reproducible 100% of the time, so I you want me to collect some 
data, I can run commands for you :)

Software versions:
Kernel version is 4.14.16-coreos (CoreOS 1632.2.1)
iscsid version 2.0-873
multipath-tools 0.6.4
no iSCSI offloading

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