[Bug 236659] kernel page fault panic when chelsio cxgbei iscsi offload engine is enabled in ctld

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236659

--- Comment #2 from Markus Wild <freebsd-bugs at virtualtec.ch> ---
Since the panic happens in rt_tables_get_rnh_ptr (table=0, fam=2) at
/usr/src/sys/net/route.c:193, which uses a VIMAGE wrapper macro, I compiled a
custom
kernel using:

include GENERIC

nooptions       VIMAGE


and I'm since stress testing the server, not a single panic. I got one 
complete stall of iscsi communication though logged with messages like:

[...]
Mar 21 11:38:14 zrhcz-nas5 kernel: WARNING: 10.140.4.15
(iqn.1998-01.com.vmware:5c80f357-6a29-a734-fef3-001b21d8e459-24252974): rece
ived PDU with CmdSN 1750169998, while expected 4482310
Mar 21 11:38:14 zrhcz-nas5 kernel: WARNING: 10.140.4.15
(iqn.1998-01.com.vmware:5c80f357-6a29-a734-fef3-001b21d8e459-24252974): rece
ived Data-Out PDU with DataSN 4, while expected 2; dropping connection
[...]

and vsphere losing the datastore, but after setting dev.t5nex.0.toe.ddp=0
this incident hasn't returned so far. 

My conclusion: the chelsio driver isn't quite VIMAGE clean yet.

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