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Fix committed upstream:

https://github.com/crash-utility/crash/commit/f4072ebf133c15cc5aad82d05e74c0ac61786a7e

 - Fixes for 32-bit X86 "bt" command on kernels that have been compiled
   with retpoline gcc support.  Without the patch, backtraces may fail 
   with the error message "bt: cannot resolve stack trace", followed by
   the text symbols found on the stack and possible exception frames.
   (anderson)

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/RHBA-2018:1930