[Bug gdb/31268] New: gdb.base/unwind-on-each-insn-amd64.exp regression

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31268

            Bug ID: 31268
           Summary: gdb.base/unwind-on-each-insn-amd64.exp regression
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simark at simark dot ca
  Target Milestone: ---

I see:

FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6: $fba_value ==
$fn_fba
FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6: check
frame-id matches
FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6: bt 2
FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6: up
FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6: $sp_value ==
$::main_sp
FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6: $fba_value ==
$::main_fba
FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6: [string equal
$fid $::main_fid]


Tom Tromey said he was only able to reproduce with an ASan build, so it might
be important here, even though gdb.log doesn't contain an ASan error.  The
first error is:

 380 (gdb) PASS: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6:
get $sp and frame base for fn: get hexadecimal valueof "$sp"
 381 info frame^M
 382 Stack level 0, frame at 0x7fffffffd5a0:^M
 383  rip = 0x40112f in foo
(/home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.base/unwind-on-each-insn-foo.c:22);
saved rip = 0x7ffff7df01ca^M
 384  called by frame at 0x7fffffffd640^M
 385  source language c.^M
 386  Arglist at 0x7fffffffd590, args: s=0x401114 <main+14> "\277\b @"^M
 387  Locals at 0x7fffffffd590, Previous frame's sp is 0x7fffffffd5a0^M
 388  Saved registers:^M
 389   rbp at 0x7fffffffd590, rip at 0x7fffffffd598^M
 390 (gdb) FAIL: gdb.base/unwind-on-each-insn-amd64.exp: foo: instruction 6:
$fba_value == $fn_fba

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