[Bug bpf/23875] New: 'stack smashing error' on foreach iteration

["me at serhei dot io" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23875

            Bug ID: 23875
           Summary: 'stack smashing error' on foreach iteration
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: me at serhei dot io
  Target Milestone: ---

global t

probe kernel.function("vfs_read") {
  t["key"] = 6
  exit()
}

probe end {
  c = 0
  foreach (k in t)
    c++
  printf("%d\n", c)
}

Pass 1: parsed user script and 49 library scripts using
120048virt/21872res/8376shr/13356data kb, in 0usr/0sys/7real ms.
Pass 2: analyzed script: 2 probes, 2 functions, 0 embeds, 1 global using
175628virt/78164res/9264shr/68936data kb, in 590usr/20sys/602real ms.
Pass 4: compiled BPF into "stap_12352.bo" in 0usr/0sys/3real ms.
Pass 5: starting run.
1
*** stack smashing detected ***: <unknown> terminated
WARNING: /opt/systemtap/bin/stapbpf exited with signal: 6 (Aborted)
Pass 5: run completed in 0usr/0sys/113real ms.
Pass 5: run failed.  [man error::pass5]

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