[Bug record/22726] New: crash while reverse-stepping with btrace recording

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22726

            Bug ID: 22726
           Summary: crash while reverse-stepping with btrace recording
           Product: gdb
           Version: 8.0.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: record
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

I'm using the gdb that comes with Fedora 26.  I'm on x86-64.

I did a recording using "record btrace pt".
Then, I tried to step backward and got an assertion failure:

(gdb) set exec-direction reverse
(gdb) s
Fsignal (error_symbol=<unavailable>, data=<unavailable>) at eval.c:1566
(gdb) s
../../gdb/record-btrace.c:1548: internal-error: btrace_frame_cache*
bfcache_new(frame_info*): Assertion `*slot == NULL' failed.


In case it matters the program I am debugging is using a JIT to
dynamically generate code.

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