On 6/18/20 3:55 PM, Pedro Alves via Gdb-patches wrote:
> On 6/17/20 3:45 PM, Rainer Orth wrote:
>> [Thread debugging using libthread_db enabled]
>> [New Thread 1 (LWP 1)]
>> Breakpoint 1 at 0x401036: file hello.c, line 6.
>> bottom-gdb.gdb:3: Error in sourced command file:
>> procfs: couldn't find pid 0 in procinfo list.
> 
> I see what this is.  This is procfs_target::wait relying on
> inferior_ptid.  Since the multi-target series, inferior_ptid
> is null_ptid before we call target_wait:
> 
> static ptid_t
> do_target_wait_1 (inferior *inf, ptid_t ptid,
> 		  target_waitstatus *status, int options)
> {
>   ptid_t event_ptid;
>   struct thread_info *tp;
> 
>   /* We know that we are looking for an event in the target of inferior
>      INF, but we don't know which thread the event might come from.  As
>      such we want to make sure that INFERIOR_PTID is reset so that none of
>      the wait code relies on it - doing so is always a mistake.  */
>   switch_to_inferior_no_thread (inf);
> 
> 
> I'm working on a patch.

Here it is.  This works for me on a Solaris 11.3 (virtual and slow...) machine.
Debugging GDB itself works for me, and I've checked that the gdb.base/break.exp
testcase passes cleanly, at least.

Your push_target fix is still necessary, FAOD.

Could you give it a try?

Thanks,
Pedro Alves