Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> writes:
> [CC: Thiago, for GDB crash]
Thanks!
> However, if I try to print "x", GDB crashes:
> ===
> (gdb) p x
> $2 = ( _data = (0x6568,
> /build/gdb-aPmCGS/gdb-12.1/gdb/value.c:856: internal-error:
> value_contents_bits_eq:
> Assertion `offset1 + length <= TYPE_LENGTH (val1->enclosing_type) *
> TARGET_CHAR_BIT'
> failed.
> A problem internal to GDB has been detected,
> further debugging may prove unreliable.
I can reproduce this crash with GDB 12.1 from Ubuntu 22.04, but testing
with current tip of trunk detects the corruption in the inferior:
Program received signal SIGSEGV, Segmentation fault.
0xf7da9070 in arena_for_chunk (ptr=0x26208) at arena.c:156
warning: 156 arena.c: No such file or directory
(gdb) bt
#0 0xf7da9070 in arena_for_chunk (ptr=0x26208) at arena.c:156
#1 arena_for_chunk (ptr=0x26208) at arena.c:160
#2 __GI___libc_free (mem=<optimized out>) at malloc.c:3390
#3 0x000125e8 in p ()
at /home/thiago.bauermann/src/gcc/gcc/testsuite/gfortran.dg/pr113363.f90:49
(gdb) frame 3
#3 0x000125e8 in p ()
at /home/thiago.bauermann/src/gcc/gcc/testsuite/gfortran.dg/pr113363.f90:49
49 deallocate (x, y)
(gdb) p x
$1 = ( _data = (<error reading variable: access outside bounds of object>,
_vptr = 0x24090 <__vtab_CHARACTER_1_.7>, _len = 6 )
(gdb)
GDB 14.1 was the first version that didn't crash, but it shows garbage
contents for x._data:
(gdb) p x
$1 = ( _data = (0x6568, 0x65), _vptr = 0x24090 <__vtab_CHARACTER_1_.7>, _len =
6 )
GDB 15.1 will be the first version that shows the out of bounds error
message.
--
Thiago
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