[Bug 211990] iscsi fails to reconnect and does not release devices

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211990

--- Comment #26 from Julien Cigar <julien at perdition.city> ---
I don't know if it's related but I also noticed some incorrect cksum:

00:14:03.380734 IP (tos 0x0, ttl 64, id 19369, offset 0, flags [DF], proto TCP
(6), length 100, bad cksum 0 (->9e84)!)
    10.20.30.31.24995 > 10.20.30.32.iscsi-target: Flags [P.], cksum 0x50bd
(incorrect -> 0xfff9), seq 1205926059:1205926107, ack 1518444144, win 16384,
options [nop,nop,TS val 1388742470 ecr 2474468733], length 48

00:14:03.380742 IP (tos 0x0, ttl 64, id 19370, offset 0, flags [DF], proto TCP
(6), length 100, bad cksum 0 (->9e83)!)
    10.20.30.31.55645 > 10.20.30.32.iscsi-target: Flags [P.], cksum 0x50bd
(incorrect -> 0x3912), seq 3104128225:3104128273, ack 1948017382, win 16384,
options [nop,nop,TS val 1388742470 ecr 4001288677], length 48

00:14:03.381060 IP (tos 0x0, ttl 64, id 54596, offset 0, flags [DF], proto TCP
(6), length 100)
    10.20.30.32.iscsi-target > 10.20.30.31.55645: Flags [P.], cksum 0x4c6a
(correct), seq 1:49, ack 48, win 16384, options [nop,nop,TS val 4001289988 ecr
1388742470], length 48

00:14:03.381070 IP (tos 0x0, ttl 64, id 54597, offset 0, flags [DF], proto TCP
(6), length 100)
    10.20.30.32.iscsi-target > 10.20.30.31.24995: Flags [P.], cksum 0x0d62
(correct), seq 1:49, ack 48, win 16384, options [nop,nop,TS val 2474470019 ecr
1388742470], length 48

... but I guess it's because TSO is enabled on the interfaces ?

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