[Bug translator/11808] New: loc2c unfinished chain from a struct $return

["jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

$ stap -ve 'probe kernel.function("next_tgid").return { println($return->tgid)
}' -p2
Pass 1: parsed user script and 74 library script(s) using
94576virt/21824res/2620shr kb, in 300usr/20sys/631real ms.
Aborted (core dumped)

GDB informs me that the abort() is from from c_emit_location():

2368	  if (loc->type != loc_final)	/* Unfinished chain.  */
2369	    abort ();

In this case, loc->type == loc_noncontiguous.

This is on kernel-2.6.33.6-147.fc13.x86_64 in fs/proc/base.c:

2822 struct tgid_iter {
2823         unsigned int tgid;
2824         struct task_struct *task;
2825 };
2826 static struct tgid_iter next_tgid(struct pid_namespace *ns, struct
tgid_iter iter)

Accessing $return->task fails in the same way, as does $return$.  $iter->tgid
also fails, but with a different message, so I'll file a separate bug.

-- 
           Summary: loc2c unfinished chain from a struct $return
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: jistone at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11808

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