Target sim crashes when recording for reverse debugging; find_inferior_ptid returns null

William Tambe tambewilliam@gmail.com
Sun May 17 14:09:58 GMT 2020


On Sun, May 17, 2020 at 4:12 AM Andrew Burgess
<andrew.burgess@embecosm.com> wrote:
>
> * William Tambe via Gdb <gdb@sourceware.org> [2020-05-16 08:56:20 -0400]:
>
> > ../../iron-toolchain/binutils/gdb/process-stratum-target.c:47:
> > internal-error: virtual gdbarch*
> > process_stratum_target::thread_architecture(ptid_t): Assertion `inf !=
> > NULL' failed.
> >
> > Above is the crash that occur after issuing following gdb commands:
> > target sim
> > load
> > record
> > si
> >
> > The crash occurs because find_inferior_ptid() returns NULL.
> > From below backtrace, is it possible to determine what could be the
> > cause of find_inferior_ptid() returning NULL ?
>
> I've been running with the patch below in place for doing reverse
> debugging on a simulator.

Should I revert this change if I need to use "target exec" ?

>
> I need to clean this up and get it merged at some point.
>
> Hope this helps,
> Thanks,
> Andrew
>
>
> ---
>
> commit ecc84c55f926c5a3d7c0dd16b8f46df597ed3f5f
> Author: Andrew Burgess <andrew.burgess@embecosm.com>
> Date:   Mon Oct 21 21:17:00 2019 +0100
>
>     gdb: Avoid target_thread_architecture
>
>     Don't call target_thread_architecture, get gdbarch from regcache
>     instead.
>
> diff --git a/gdb/record-full.c b/gdb/record-full.c
> index 51b7beabf66..8c83b017b26 100644
> --- a/gdb/record-full.c
> +++ b/gdb/record-full.c
> @@ -1074,9 +1074,10 @@ record_full_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
>
>    if (!RECORD_FULL_IS_REPLAY)
>      {
> -      struct gdbarch *gdbarch = target_thread_architecture (ptid);
> +      struct regcache *regcache = get_current_regcache ();
> +      struct gdbarch *gdbarch = regcache->arch ();
>
> -      record_full_message (get_current_regcache (), signal);
> +      record_full_message (regcache, signal);
>
>        if (!step)
>          {
>
>
>


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