RE: stuck iscsi/iser target with linux-4.15.0-rc1

["Steve Wise" <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

> > [239800.115739] target_wait_for_sess_cmds: Waiting for se_cmd:
> ffff88034082c998 t_state: 6, fabric state: 12
> 
> Hmm, this means that the command was delegated to isert to send
> data+response... Which means we lose a reference put somewhere here.
> 
> I'm assuming that this happens before your changes to ib_drain_qp
> correct? If this does not happen without your changes it might indicate
> that drain_qp is missing an error (or successful?) completion which
> would prevent a final reference drop (isert_completion_put).

Hey Sagi, I'm trying to reproduce this on CX4 cards with mlx5.  I have the two nodes setup via RoCEv2 and rping works over mlx5 fine, but when I try to discover the iSER targets, the initiator fails with:

[root@potato1 ~]# iscsiadm -m discovery -t sendtargets -p 172.16.99.239:3260 -I iser
iscsiadm: recv's end state machine bug?
iscsiadm: Could not perform SendTargets discovery: iSCSI PDU timed out
[root@potato1 ~]# uname -r
4.15.0-rc3+

And the target logs this:

[  873.240460] mlx5_0:dump_cqe:277:(pid 494): dump error cqe
[  873.246665] 00000000 00000000 00000000 00000000
[  873.251942] 00000000 00000000 00000000 00000000
[  873.257214] 00000000 00000000 00000000 00000000
[  873.262472] 00000000 00008a12 0a0000f6 00014bd2
[  873.267711] isert: isert_print_wc: send failure: invalid request error (9) vend_err 8a

Any ideas?  I'm using straight 4.15.0-rc3 + a workaround to avoid crashing my x86 systems at bootup from here:

https://www.mail-archive.com/netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org/msg203210.html'

Steve.
Thanks,

Steve.



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