[Bug gdb/31507] [gdb, aarch64] FAIL: gdb.arch/disp-step-insn-reloc.exp: can_relocate_adr_forward: relocated instruction

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31507

--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
More minimal version:
...
$ cat gdb.in
file
/home/linux/gdb/build/gdb/testsuite/outputs/gdb.arch/disp-step-insn-reloc/disp-step-insn-reloc
start
break *set_point0
break *set_point1
break *set_point2
break pass
break fail
set displaced-stepping on
continue
bt
continue
bt
continue
bt
continue
bt
continue
bt
continue
bt
$ gdb -q -batch -ex "set trace-commands on" -x gdb.in 2>&1 | tee LOG; grep
Breakpoint LOG
...

Usually, we have:
...
Breakpoint 2, 0x0000aaaaaaaa08bc in can_relocate_b () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:128
Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
Breakpoint 3, 0x0000aaaaaaaa090c in can_relocate_bcond_true () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:164
Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
Breakpoint 4, 0x0000aaaaaaaa0958 in can_relocate_cbz () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:203
Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
...

But once in a while:
...
Breakpoint 2, 0x0000aaaaaaaa08bc in can_relocate_b () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:128
Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
Breakpoint 3, 0x0000aaaaaaaa090c in can_relocate_bcond_true () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:164
Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
Breakpoint 4, 0x0000aaaaaaaa0958 in can_relocate_cbz () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:203
...

Looking at the backtrace, we hit pass twice without making progress:
...
+continue

Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
31      }
+bt
#0  pass () at /home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
#1  0x0000aaaaaaaa0928 in can_relocate_bcond_true () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:179
#2  0x0000aaaaaaaa0c9c in main () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:629
+continue

Breakpoint 5, pass () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
31      }
+bt
#0  pass () at /home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:31
#1  0x0000aaaaaaaa0928 in can_relocate_bcond_true () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:179
#2  0x0000aaaaaaaa0c9c in main () at
/home/linux/gdb/src/gdb/testsuite/gdb.arch/insn-reloc.c:629
...

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