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Created attachment 1595459 [details]
patch with reproducer testcase and bugfix

Description of problem:

https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=commitdiff;h=e037dc796de75b0d9e7e893fba6a39c2837aca2b

In some circumstances foreach iteration with string keys in systemtap 4.1 can trigger a segfault in the userspace stapbpf interpreter.

Version-Release number of selected component (if applicable):
systemtap-4.1-3

How reproducible:

Use testcase foreach_string.stp provided in above patch.


Steps to Reproduce:
1. $ sudo stap -v --bpf foreach_string.stp.

Actual results:
Terminates with segfault.

Expected results:
No segfault.


Additional info:

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:3366