Re: [PATCH] target: fix crash in cmd tracing when cmd didn't match a LUN

[Christoph Hellwig]

On Thu, Jul 23, 2015 at 03:19:32PM -0700, Spencer Baugh wrote:
> From: Alexei Potashnik <alexei@xxxxxxxxxxxxxxx>
> 
> If command didn't match a LUN and we're sending check condition, the
> target_cmd_complete ftrace point will crash because it assumes that
> cmd->t_task_cdb has been set.
> 
> The fix will temporarily set t_task_cdb to the se_cmd buffer
> and copy first 6 bytes of cdb in there as soon as possible.
> At a later point t_task_cdb is reset to the correct buffer,
> but until then traces and printks don't cause a crash.

This is too ugly to live.  Just dropping the t_task_cdb dereference
from the trace point sounds like the simples quick fix for now,
and removing the crazy layering violation in iSCSI that opencode
target_submit_cmd is the proper long term fix.
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