[Bug 216906] [iSCSI] Bad CRC may not be correctly handled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216906

            Bug ID: 216906
           Summary: [iSCSI] Bad CRC may not be correctly handled
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ben.rubson at gmail.com

Hello,

Adding hardware CRC32C support to FreeBSD (#216467), we found that iSCSI CRC
errors may not be correctly handled.

When one of the patch #216467 versions generated bad CRC, here is how the iSCSI
test disk behaved :
disk connected successfully (here the CRC were certainly right), but as soon as
there were some trafic, disk hung, and it was not possible to recover it,
reboot needed.

>From /var/log/messages :
kernel: WARNING: 192.168.2.1 (iqn.2012-06.srv1:rT1): no ping reply (NOP-In)
after 5 seconds; reconnecting
srv1 last message repeated 31 times
srv1 last message repeated 42 times

No digest failed message.

Should we try to reproduce / investigate on this ?

Many thanks !

Ben

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